INGROUND DRILL STRING HOUSING AND METHOD FOR SIGNAL COUPLING
An inground housing is insertable in at least one joint of a drill string extending from a drill rig. The inground housing supports an electronics assembly for processing a data signal relating to the inground operation and a signal coupling arrangement for transferring the data signal between the electronics assembly and the drill rig by electromagnetically coupling the data signal between the signal coupling arrangement and the drill string such that the data signal is electrically conducted as an electrical data signal along at least a portion of the drill string that extends from the inground housing. In another feature, a current transformer is resiliently supported to isolate the current transformer from mechanical shock and vibration that is produced by an inground operation that is performed using the drill string. In another feature, a drill string repeater is described.
The present application is related to U.S. patent application Ser. No. ______, (Attorney Docket No. DCI-54) entitled DRILL STRING ADAPTER AND METHOD FOR INGROUND SIGNAL COUPLING, sharing the filing date of the present application and which is hereby incorporated by reference in its entirety.
BACKGROUNDThe present application is generally related to inground operations and, more particularly, to a system, apparatus and method for electromagnetically coupling an electrical signal onto an electrically conductive drill string to produce a corresponding electrical signal on the drill string.
Generally, an inground operation such as, for example, drilling to form a borehole, subsequent reaming of a borehole for purposes of installing a utility line, borehole mapping and the like use an electrically conductive drill string which extends from an above ground drill rig. The prior art includes examples of the use of an electrically conductive drill string as an electrical conductor for serving to electrically conduct a data signal from an inground tool to the drill rig. The surrounding earth itself serves as a signal return path for purposes of detecting the signal at the drill rig. This type of system is often referred to as a measurement while drilling, MWD, system. Applicants recognize, however, that that there remains a need for improvement in MWD systems.
The foregoing examples of the related art and limitations related therewith are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a study of the drawings.
SUMMARYThe following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope. In various embodiments, one or more of the above-described problems have been reduced or eliminated, while other embodiments are directed to other improvements.
Generally, an apparatus and associated method are utilized in a system in which an inground tool is moved through the ground in a region for performing an inground operation. The system includes a drill rig and a drill string which extends between the inground tool and the drill rig and is configured for extension and retraction from the drill rig. The drill string is made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time. In one aspect of the disclosure, an inground housing is removably insertable at one of the joints as the drill string is extended to thereafter form part of the drill string. The inground housing defines a housing cavity that is configured for receiving an electronics assembly that processes a data signal relating to the inground operation. A signal coupling arrangement is supported by the inground housing and configured at least for electrical communication with the electronics assembly when received in the housing cavity and for transferring the data signal between the electronics assembly in the housing cavity and the drill rig at least in part by electromagnetically coupling the data signal between the signal coupling arrangement and the drill string such that the data signal is electrically conducted as an electrical data signal along at least a portion of the drill string that extends from the inground housing and at least some of the electrically conductive drill pipe sections forming said portion of the drill string cooperate as an electrical conductor for carrying the electrical data signal.
In another aspect of the present disclosure, a repeater is described for use in a system in which an inground tool is moved through the ground in a region for performing an inground operation. The system includes a drill rig and a drill string which extends between the inground tool and the drill rig and is configured for extension and retraction from the drill rig. The drill string is made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time. The repeater includes an inground housing including a housing body that defines a housing cavity and the inground housing is removably insertable at any selected one of the joints as the drill string is extended to thereafter form part of the drill string. The inground housing includes a signal coupling arrangement for providing bidirectional electromagnetic coupling between the inground housing and the drill string for receiving a data signal that is carried by electrical conduction by at least some of the electrically conductive drill pipe sections making up one portion of the drill string by electromagnetically coupling the data signal from the drill string to the inground housing as a received data signal. A repeater electronics package is received in the housing cavity of the inground housing and can be in electrical communication with the signal coupling arrangement for producing a repeater signal based on the received data signal, but which is distinguishable from the received data signal and for providing the repeater signal to the signal coupling arrangement such that the signal coupling arrangement electromagnetically couples the repeater signal back to the drill string for transfer of the repeater signal as another electrical signal along the drill string such that the repeater signal is electrically conducted by at least some of the electrically conductive drill pipe sections making up a different portion of the drill string.
In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the drawings and by study of the following descriptions.
Exemplary embodiments are illustrated in referenced figures of the drawings. It is intended that the embodiments and figures disclosed herein are to be illustrative rather than limiting.
The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the described embodiments will be readily apparent to those skilled in the art and the generic principles taught herein may be applied to other embodiments. Thus, the present invention is not intended to be limited to the embodiment shown, but is to be accorded the widest scope consistent with the principles and features described herein including modifications and equivalents, as defined within the scope of the appended claims. It is noted that the drawings are not to scale and are diagrammatic in nature in a way that is thought to best illustrate features of interest. Descriptive terminology such as, for example, up, down, upper, lower, left, right and the like may be used with respect to these descriptions, however, this terminology has be adopted with the intent of facilitating the reader's understanding and is not intended as being limiting. Further, the figures are not to scale for purposes of illustrative clarity.
Turning now to the figures wherein like components are indicated by like reference numbers throughout the various figures, attention is immediately directed to
With continuing reference to
Each drill pipe section defines a through opening 34 (one of which is indicated) extending between opposing ends of the pipe section. The drill pipe sections can be fitted with what are commonly referred to as box and pin fittings such that each end of a given drill pipe section can threadingly engage an adjacent end of another drill pipe section in the drill string in a well known manner. Once the drill pipe sections are engaged to make up the drill string, the through openings of adjacent ones of the drill pipe sections align to form an overall pathway 36 that is indicated by an arrow. Pathway 36 can provide for a pressurized flow of drilling fluid or mud, consistent with the direction of arrow 36, from the drill rig to the drill head, as will be further described.
The location of the boring tool within region 12 as well as the underground path followed by the boring tool may be established and displayed at drill rig 14, for example, on a console 42 using a display 44. The console can include a processing arrangement 46 and a control actuator arrangement 47.
Boring tool 20 can include a drill head 50 having an angled face for use in steering based on roll orientation. That is, the drill head when pushed ahead without rotation will generally be deflected on the basis of the roll orientation of its angled face. On the other hand, the drill head can generally be caused to travel in a straight line by rotating the drill string as it is pushed as indicated by a double headed arrow 51. Of course, predictable steering is premised upon suitable soil conditions. It is noted that the aforementioned drilling fluid can be emitted as jets 52 under high pressure for purposes of cutting through the ground immediately in front of the drill head as well as providing for cooling and lubrication of the drill head. Boring tool 20 includes an inground housing 54 that receives an electronics package 56. The inground housing is configured to provide for the flow of drilling fluid to drill head 50 past the electronics package, as will be seen in a subsequent figure. In one embodiment, the electronics package can be cylindrical in configuration and supported within housing 54. Drill head 50 can include a pin fitting that is received by a box fitting of inground housing 54. An opposing end of the inground housing can include a box fitting that receives a pin fitting of drill pipe section n which defines a distal, inground end of the drill string. Of course, drill head 50 can be replaced by any suitable inground tool having a pin fitting such as, for example, a reaming tool, a reaming tool in combination with a tension monitoring arrangement, a mapping arrangement or suitable combinations thereof. It is noted that the pipe fittings of the drill head and the inground housing are generally the corresponding box and pin fittings as found on the drill pipe sections of the drill string for facilitating removable attachment of the drill pipe sections to one another in forming the drill string. Thus, inground housing 54 can engage an inground tool such as, for example, drill head 50 having a pin fitting while having an opposing box fitting for removable engagement with the inground/distal end of the drill string. For purposes of inserting inground housing 54 into the drill string, for reasons yet to be described, a box to pin adapter (not shown) can be used in order to adapt box fitting 114 to a pin fitting. It is noted, in this regard, that box to pin fitting adapters are well known in the art. In another embodiment, yet to be described, the inground housing can include a box fitting and an opposing pin fitting.
Inground electronics package 56 can include a transceiver 64 which, in some embodiments, can transmit a locating signal 66 such as, for example, a dipole locating signal, although this is not required. In some embodiments, transceiver 64 can receive an electromagnetic signal that is generated by other inground components as will be described at an appropriate point below. The present example will assume that the electromagnetic signal is a locating signal in the form of a dipole signal for descriptive purposes. Accordingly, the electromagnetic signal may be referred to as a locating signal. It should be appreciated that the dipole signal can be modulated like any other electromagnetic signal and that the modulation data is thereafter recoverable from the signal. The locating functionality of the signal depends, at least in part, on the characteristic shape of the flux field and its signal strength rather than its ability to carry modulation. Thus, modulation is not required. Information regarding certain parameters of the boring tool such as, for example, pitch and roll (orientation parameters), temperature and drilling fluid pressure can be measured by a suitable sensor arrangement 68 forming part of the electronics package which may include, for example, a pitch sensor, a roll sensor, a temperature sensor, an AC field sensor for sensing proximity of 50/60 Hz utility lines, a DC magnetic field sensor for sensing yaw orientation and any other sensors that are desired. Electronics package 56 further includes a processor 70 that is interfaced as necessary with sensor arrangement 68 and transceiver 64. Another sensor that can form part of the sensor arrangement is an accelerometer that is configured for detecting accelerations on one or more axes. Power can be provided by a battery 72.
A portable locator 80 can be used to detect electromagnetic signal 66. One suitable and highly advanced portable locater is described in U.S. Pat. No. 6,496,008, entitled FLUX PLANE LOCATING IN AN UNDERGROUND DRILLING SYSTEM, which is commonly owned with the present application and is incorporated herein by reference in its entirety. As mentioned above, the present descriptions apply to a variety of inground operations and are not intended as being limiting, although the framework of horizontal directional drilling has been employed for descriptive purposes. As discussed above, the electromagnetic signal can carry information including orientation parameters such as, for example, pitch and roll. Other information can also be carried by the electromagnetic signal. Such information can include, by way of example, parameters that can be measured proximate to or internal to the boring tool including temperatures and voltages such as a battery or power supply voltage. Locator 80 includes an electronics package 82. The electronics package is interfaced for electrical communication with the various components of the locator and can perform data processing. Information of interest can be modulated on electromagnetic signal 66 in any suitable manner and transmitted to locator 80 and/or an antenna 84 at the drill rig, although this is not required. Any suitable form of modulation may be used either currently available or yet to be developed. Examples of currently available and suitable types of modulation include amplitude modulation, frequency modulation, phase modulation and variants thereof. Any parameter of interest in relation to drilling such as, for example, pitch may be displayed on display 44 and/or on a display 86 of locator 80 as recovered from the locating signal. Drill rig 14 can transmit a telemetry signal 98 that can be received by locator 80. The telemetry components provide for bidirectional signaling between the drill rig and locator 80. As one example of such signaling, based on status provided by drill rig monitoring unit 32, the drill rig can transmit an indication that the drill string is in a stationary state because a drill pipe section is being added to or removed from the drill string.
Still referring to
Attention is now directed to
Turning now to
With primary reference to
In one embodiment, the electronics package can include a cable pigtail 100 that is internally electrically connected, for example, to printed circuit board 122 (
Referring to
The current transformer can be designed with at least the following in mind:
-
- a. Shock and vibration. The material selection and construction can provide for withstanding the shock and vibration for the downhole drilling environment.
- b. Magnetic material selection can be based on low core loss at the operating frequency, high flux saturation and mechanical robustness.
- c. High flux saturation of the core can permit a reduction in cross-sectional area of the magnetic core, to provide for increasing the cross-sectional area of the adapter coupling main body for torque and power transmission.
- d. Low inter winding capacitance for high frequency response.
In view of the foregoing, in one embodiment and by way of non-limiting example, a tape wound core can be used. As will be familiar to one of ordinary skill in the art, such cores are less susceptible to shock and vibration than ferrite cores. Such a tape wound core can be produced using a thin, high magnetic flux saturation tape in order to avoid eddy current losses in the core. In different embodiments, the tape thickness can range from 0.00025″ to 0.001″. One suitable thickness is 0.0007″. The tape wound core can be finished, for example, using powder coating or epoxy coating. In one embodiment, additional vibration and shock protection can be provided for the current transformer and its core based on the manner by which the current transformer is mounted in groove 204, as will be described at an appropriate point hereinafter.
One or both of current transformer leads 202a and 202b (
Referring to
Assembly of one embodiment can proceed, for example, by installing current transformer 200 into annular groove 204. Cable 100 can be extended into through passages 240 and 242 from the electronics package to the current transformer. Electrical connections can be made between the current transformer leads and cable 100, for example, using crimp connections or any other suitable connections. It should be appreciated that the current transformer, cylindrical ring and high pressure electrical connector assembly are readily replaceable/repairable in the field.
Referring to
Accordingly, a shock isolated and mounted current transformer and associated method have been brought to light herein. The housing which supports the current transformer includes a housing body that can be removably insertable at one of the joints of the drill string as the drill string is extended to thereafter form part of the drill string. The housing is configured at least for receiving the current transformer with the current transformer inductively coupled to the drill string. A support arrangement resiliently supports the current transformer on the housing body such that the current transformer is isolated at least to some extent from a mechanical shock and vibration environment to which the housing is subjected responsive to the inground operation. In some cases, a drill pipe section can be configured to support a current transformer in a manner that is consistent with the descriptions above, for example, when the drill pipe section includes a sidewall thickness that is sufficiently thick for purposes of defining a support groove for the current transformer without unduly weakening the drill pipe section. Additionally, a drill pipe section having a sidewall of sufficient thickness can support the electrical connections, passages and assemblies described above with limited or no modification as will be recognized by one having ordinary skill in the art with this overall disclosure in hand.
Referring to
Still referring to
Referring to
Referring to
The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or forms disclosed, and other embodiments, modifications and variations may be possible in light of the above teachings wherein those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof.
Claims
1. In a system in which an inground tool is moved through the ground in a region for performing an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, an apparatus comprising:
- an inground housing that is removably insertable at one of the joints as the drill string is extended to thereafter form part of the drill string and said inground housing defines a housing cavity that is configured for receiving an electronics assembly that processes a data signal relating to the inground operation; and
- a signal coupling arrangement supported by the inground housing and configured at least for electrical communication with the electronics assembly when received in the housing cavity and for transferring the data signal between the electronics assembly in the housing cavity and the drill rig at least in part by electromagnetically coupling the data signal between the signal coupling arrangement and the drill string such that the data signal is electrically conducted as an electrical data signal along at least a portion of the drill string that extends from the inground housing and at least some of the electrically conductive drill pipe sections forming said portion of the drill string cooperate as an electrical conductor for carrying the electrical data signal.
2. The apparatus of claim 1 wherein said portion of the drill string extends at least partially from the inground housing to the drill rig such that the signal coupling arrangement couples the data signal between the signal coupling arrangement and said portion of the drill string.
3. The apparatus of claim 1 wherein said signal coupling arrangement is configured for electromagnetically receiving the electrical data signal from said portion of the drill string as the data signal and thereafter electrically transferring the data signal to the electronics assembly such that the apparatus serves as a receiver.
4. The apparatus of claim 1 wherein said signal coupling arrangement is configured for electromagnetically transferring the data signal from said electronics assembly to said portion of the drill string to produce the electrical data signal in the drill string such that the apparatus serves as a transmitter.
5. The apparatus of claim 1 wherein said signal coupling arrangement is configured for bidirectional coupling of the data signal between the electronics assembly and the drill string such that the apparatus serves as a transceiver.
6. The apparatus of claim 1 wherein said signal coupling arrangement includes a current transformer supported by the inground housing and in electrical communication with the electronics package when received in the housing cavity for electromagnetically coupling the data signal between the drill string and said current transformer.
7. The apparatus of claim 6 wherein said inground housing includes an outer surface configuration that defines an annular groove for receiving said current transformer therein.
8. The apparatus of claim 7 further comprising:
- a support arrangement for resiliently supporting said current transformer within said annular groove on said inground housing such that the current transformer is isolated at least to some extent from a mechanical shock and vibration environment to which the housing is subjected responsive to said inground operation.
9. The apparatus of claim 8 wherein said support arrangement includes a plurality of resilient spacers that are distributed around a peripheral configuration of the current transformer for supporting the current transformer in the annular groove and a resilient potting compound that is received in said annular groove between said resilient spacers for further supporting the current transformer in said annular recess groove to isolate the current transformer from the mechanical shock and vibration environment.
10. The apparatus of claim 8 wherein said support arrangement includes a resilient potting compound surrounding the current transformer in said annular recess groove to isolate the current transformer from the mechanical shock and vibration environment.
11. The apparatus of claim 1 wherein said electronics package includes a sensor section and the electronics package is configured for producing said data signal responsive to a sensor signal from at least one sensor in the sensor section such that the signal coupling arrangement electromagnetically couples the sensor signal onto the drill string for transfer to the drill rig using at least some of the electrically conductive drill pipe sections as said electrical conductor and said electronics package includes a locating signal antenna for electromagnetically transmitting an electromagnetic locating signal and said inground housing is configured for emanating said electromagnetic signal into the ground surrounding the inground housing.
12. The apparatus of claim 1 wherein each drill pipe section includes a box fitting at one end and a pin fitting at an opposing end and wherein said inground housing includes said box fitting at one end and said pin fitting at an opposite end.
13. The apparatus of claim 12 wherein each drill pipe section defines a through passage to provide for a flow of drilling fluid through the drill string and wherein said inground housing defines an internal passage which provides for said flow of drilling fluid through the inground housing between the box fitting and the pin fitting of the inground housing.
14. The apparatus of claim 1 wherein each drill pipe section includes a box fitting at one end and a pin fitting at an opposing end and wherein said inground housing includes said box fitting at each end and said apparatus includes a box to pin adapter that is removably attached to one of the box fittings of the inground housing to form part of said drill string.
15. The apparatus of claim 14 wherein said signal coupling arrangement is positioned nearest to a selected one of the box fittings of the inground housing and the box to pin adapter is removably attached to the other box fitting at an opposite end of the inground housing from the selected fitting.
16. The apparatus of claim 1 wherein said signal coupling arrangement includes a current transformer supported by the inground housing and in electrical communication with the electronics package when received in the housing cavity for electromagnetically coupling the data signal between the drill string and said current transformer, and the current transformer includes a winding having a first current transformer electrical lead that is electrically connected to the electronics assembly.
17. The apparatus of claim 16 wherein said winding includes a second current transformer lead that is electrically connected to the electronics package such that the first current transformer lead and the second current transformer lead are in electrical isolation from the drill string.
18. The apparatus of claim 16 wherein said electronics assembly includes a case that serves as one electrical terminal for the electronics package and inground housing is configured to cooperate with the case such that the case is electrically coupled to the inground housing and wherein said winding includes a second current transformer lead that is electrically connected to the inground housing for electrical communication with the electronics assembly.
19. In a system in which an inground tool is moved through the ground in a region for performing an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, a method comprising:
- arranging an inground housing for removable insertion at one of the joints as the drill string is extended to thereafter form part of the drill string and defining a housing cavity within the inground housing that is configured for receiving an electronics assembly that processes a data signal relating to the inground operation;
- supporting a signal coupling arrangement using the inground housing; and
- configuring said signal coupling arrangement for electrical communication with the electronics assembly, when received in the housing cavity, and for transferring the data signal between the electronics assembly in the housing cavity and the drill rig at least in part by electromagnetically coupling the data signal between the signal coupling arrangement and the drill string such that the data signal is electrically conducted as an electrical data signal along at least a first portion of the drill string that extends from the inground housing and at least some of the electrically conductive drill pipe sections forming said first portion of the drill string cooperate as an electrical conductor for carrying the electrical data signal.
20. The method of claim 19 wherein said portion of the drill string extends at least partially from the inground housing to the drill rig and the method includes electromagnetically coupling the data signal between the signal coupling arrangement and said portion of the drill string.
21. The method of claim 19 including configuring said signal coupling arrangement for electromagnetically receiving the electrical data signal from said portion of the drill string as the data signal and thereafter electrically transferring the data signal to the electronics assembly such that the electronics assembly serves as a receiver.
22. The method of claim 19 including configuring said signal coupling arrangement for electromagnetically transferring the data signal from said electronics assembly to said portion of the drill string to produce the electrical data signal in the drill string such that the electronics assembly serves as a transmitter.
23. The method of claim 19 including configuring said signal coupling arrangement for bidirectional coupling of the data signal between the electronics assembly and the drill string such that the electronics assembly serves as a transceiver.
24. The method of claim 19 including supporting a current transformer using the inground housing as part of the signal coupling arrangement and electrically connecting the current transformer in communication with the electronics package when received in the housing cavity for electromagnetically coupling the data signal between the drill string and said current transformer.
25. The method of claim 24 wherein said inground housing includes an outer surface configuration and defining an annular recess as part of the outer surface configuration and receiving said current transformer in said annular recess.
26. The method of claim 25 further comprising:
- resiliently supporting said current transformer within said annular recess on said inground housing such that the current transformer is isolated at least to some extent from a mechanical shock and vibration environment to which the inground housing is subjected responsive to said inground operation.
27. The method of claim 26 wherein resiliently supporting includes arranging a plurality of resilient spacers in a spaced apart, distributed way around a peripheral configuration of the current transformer for supporting the current transformer in the annular groove and applying a resilient potting compound in said annular recess between said resilient spacers for further supporting the current transformer in said annular groove to isolate the current transformer from the mechanical shock and vibration environment.
28. The method of claim 26 including applying a resilient potting compound in said wherein said support arrangement includes a resilient potting compound in said annular recess to surround the current transformer in said annular recess to isolate the current transformer from the mechanical shock and vibration environment.
29. The method of claim 19 wherein said electronics package includes a sensor section and the electronics assembly is configured for producing said data signal responsive to a sensor signal from at least one sensor in the sensor section such that the signal coupling arrangement electromagnetically couples the sensor signal onto the drill string for transfer to the drill rig using at least some of the electrically conductive drill pipe sections as said electrical conductor and said electronics assembly includes a locating signal antenna for electromagnetically transmitting an electromagnetic locating signal and including configuring said inground housing for emanating said electromagnetic locating signal into the ground surrounding the inground housing.
30. The method of claim 19 wherein each drill pipe section includes a box fitting at one end and a pin fitting at an opposing end and including configuring said inground housing to include said box fitting at one end and said pin fitting at an opposite end.
31. The method of claim 30 wherein each drill pipe section defines a through passage to provide for a flow of drilling fluid through the drill string and including configuring said inground housing to define an internal passage which provides for said flow of drilling fluid through the inground h
32. The method of claim 19 wherein each drill pipe section includes a box fitting at one end and a pin fitting at an opposing end and said method includes configuring said inground housing including said box fitting at each end and providing a box to pin adapter that is removably attachable to one of the box fittings of the inground housing to form part of said drill string.
33. The method of claim 32 including positioning said signal coupling arrangement nearest to a selected one of the box fittings of the inground housing and removably attaching the box to pin adapter to the other box fitting at an opposite end of the inground housing from the selected fitting.
34. The method of claim 19 including supporting a current transformer on said inground housing as part of said signal coupling arrangement and connecting the current transformer in electrical communication with the electronics assembly when received in the housing cavity for electromagnetically coupling the data signal between the drill string.
35. The method of claim 34 wherein said current transformer includes a winding having a first current transformer electrical lead that is electrically connected to the electronics assembly by said connecting.
36. The method of claim 35 wherein said winding includes a second current transformer lead and connecting further includes electrically connecting the second current transformer lead to the electronics assembly such that the first current transformer lead and the second current transformer lead are in electrical isolation from the drill string.
37. The method of claim 35 wherein said electronics assembly includes a case that serves as one electrical terminal for the electronics assembly and connecting includes configuring the inground housing to cooperate with the case such that the case is electrically coupled to said inground housing and wherein said winding includes a second current transformer lead and connecting includes electrically connecting the second current transformer lead to the inground housing for electrical communication with the electronics assembly.
38. A repeater for use in a system in which an inground tool is moved through the ground in a region for performing an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, said repeater comprising:
- an inground housing including a housing body that defines a housing cavity and said inground housing is removably insertable at any selected one of the joints as the drill string is extended to thereafter form part of the drill string and said inground housing includes a signal coupling arrangement for providing bidirectional electromagnetic coupling between the inground housing and the drill string for receiving a data signal that is carried by electrical conduction by at least some of the electrically conductive drill pipe sections making up one portion of the drill string by electromagnetically coupling the data signal from the drill string to the inground housing as a received data signal; and
- a repeater electronics package received in said housing cavity of the inground housing and which is in electrical communication with the signal coupling arrangement for producing a repeater signal based on the received data signal, but which is distinguishable from the received data signal and for providing the repeater signal to the signal coupling arrangement such that the signal coupling arrangement electromagnetically couples the repeater signal back to the drill string for transfer of the repeater signal as another electrical signal along the drill string such that the repeater signal is electrically conducted by at least some of the electrically conductive drill pipe sections making up a different portion of the drill string.
39. The apparatus of claim 38 wherein said inground housing includes a current transformer in electrical communication with the inground tool for receiving the data signal and electromagnetically coupling the data signal at least onto said portion of the drill string and said coupling adapter further includes an adapter body assembly having an outer surface configuration that defines an annular recess for receiving said current transformer therein.
40. A method for use in a system in which an inground tool is moved through the ground in a region for performing an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, said method comprising:
- configuring an inground housing to include a housing body that defines a housing cavity and said inground housing is removably insertable at any selected one of said joints as the drill string is extended to thereafter form part of the drill string and arranging said inground housing to include a signal coupling arrangement for providing bidirectional electromagnetic coupling between the inground housing and the drill string for receiving a data signal that is carried by electrical conduction by at least some of the electrically conductive drill pipe sections making up one portion of the drill string by electromagnetically coupling the data signal from the drill string to the inground housing as a received data signal; and
- supporting a repeater electronics package in said housing cavity of the inground housing in electrical communication with the signal coupling arrangement for producing a repeater signal based on the received data signal, but which is distinguishable from the received data signal and providing the repeater signal to the signal coupling arrangement such that the signal coupling arrangement electromagnetically couples the repeater signal back to the drill string for transfer of the repeater signal as another electrical signal along the drill string such that the repeater signal is electrically conducted by at least some of the electrically conductive drill pipe sections making up a different portion of the drill string.
41. The method of claim 40 including configuring the housing body of the inground housing to include a current transformer in electrical communication with the inground tool for receiving the data signal and electromagnetically coupling the data signal at least onto said portion of the drill string and further configuring the housing body to include an outer surface configuration that defines an annular recess for receiving said current transformer therein.
42. In a system in which an inground tool is moved through the ground in a region during an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, an apparatus comprising:
- an electronics package that is configured for inground operation;
- a current transformer configured for inductively coupled communication with said drill string as part of providing for communication between said electronics package and said drill rig on said drill string by using the drill string as an electrical conductor;
- a housing having a housing body that is removably insertable at one of the joints as the drill string is extended to thereafter form part of the drill string and said housing is configured at least for receiving said current transformer with the current transformer inductively coupled to the drill string and said housing defines a housing cavity for receiving said electronics package therein; and
- a support arrangement for resiliently supporting said current transformer on said housing body such that the current transformer is isolated at least to some extent from a mechanical shock and vibration environment to which the housing is subjected responsive to said inground operation.
43. In a system in which an inground tool is moved through the ground in a region during an inground operation, said system including a drill rig and a drill string which extends between said inground tool and said drill rig and is configured for extension and retraction from said drill rig, said drill string being made up of a plurality of electrically conductive drill pipe sections, each of which includes a section length and each of which is configured for removable attachment to the inground tool at one joint and to one another at other joints that are formed between adjacent ones of the drill pipe sections such that the drill string includes a plurality of joints to facilitate the extension and retraction of the drill string by one section length at a time, a method comprising:
- providing an electronics package that is configured for inground operation;
- configuring a current transformer for inductively coupled communication with said drill string as at least part of providing for communication between said electronics package and said drill rig on said drill string by using at least a portion of the drill string as an electrical conductor;
- arranging a housing having a housing body for removable insertion at one of the joints as the drill string is extended to thereafter form part of the drill string and configuring said housing at least for receiving said current transformer with the current transformer inductively coupled to the drill string and defining a housing cavity within the housing for receiving said electronics package therein; and
- resiliently supporting the current transformer on said housing body for said inductive coupling to the drill string such that the current transformer is isolated at least to some extent from a mechanical shock and vibration environment to which the housing is subjected responsive to said inground operation.
Type: Application
Filed: Feb 25, 2011
Publication Date: Aug 30, 2012
Inventors: Albert W. Chau (Woodinville, WA), Benjamin John Medeiros (Orting, WA)
Application Number: 13/035,833
International Classification: E21B 47/16 (20060101);