Lateral control system
Disclosed herein is a lateral monitoring and/or control system. The system includes at least one splitter having a lateral bore and a main bore, at least one control line at the splitter and at least one of a choke module, monitoring module, flow venturi module and a control module disposed in operable communication with the lateral bore and outside of the main bore. Further disclosed herein is a method for controlling and/or monitoring of a multi-lateral well system. The method includes installing one or more splitter in a borehole, installing at least one control line to communicate remotely with each of the one or more splitters selectively communicating with one or more of at least one of a monitoring module, control module, choke module and flow venturi module.
This application claims the benefit of U.S. Provisional Application No. 60/673,529 filed Apr. 21, 2005, the contents of which are incorporated by reference herein in their entirety.
BACKGROUNDIn the hydrocarbon industry it is becoming more and more common to employ multiple branches known as laterals from a main leg of a wellbore. Wells having this characteristic are known as multilateral wellbores. Multilateral wellbores are advantageous because they, by definition, access different areas of a hydrocarbon bearing formation from a single surface location. This is desirable from a cost standpoint for capital expenditure as well as having a much lesser impact on the surface environment.
Important with respect to multilateral wellbores is control and/or monitoring of fluids produced. It is desirable to monitor produced fluids to optimize production or so that action might be taken to avoid contamination of the well due to, for example, early water breakthrough in one of the laterals.
One of the problems associated with current monitoring and control schemes is that a large number of devices may need to be pulled from the well if entry to a more downhole portion of the well is required. Alternatively, entry may be had to remote portion of the well by using a device small enough to be run through the completion tubing but such devices are inherently small in size. In some cases, devices small enough to be run through the completion string are insufficient desirably address whatever issue prompted the run.
SUMMARYDisclosed herein is a lateral monitoring and/or control system. The system includes at least one splitter having a lateral bore and a main bore, at least one control line at the splitter and at least one of a choke module, monitoring module, flow venturi module, and a control module disposed in operable communication with the lateral bore and outside of the main bore.
Further disclosed herein is a method for controlling and/or monitoring of a multi-lateral well system. The method includes installing one or more splitter in a borehole, installing at least one control line to communicate remotely with each of the one or more splitters selectively communicating with one or more of at least one of a monitoring module, control module, choke module and flow venturi module.
BRIEF DESCRIPTION OF THE DRAWINGSReferring now to the drawings wherein like elements are numbered alike in the several Figures:
Referring to
The concept hereof provides for arrangement of modules and control lines in different configurations for different applications all of which maintain an open main bore. This can be in a tubing string and/or a casing string in different systems with differing overall properties. As noted above, control and/or monitoring modules are to be placed so as to interact with a target lateral (or potentially monitor parameters of the main bore) but not occlude the main bore. Thereby, greater access and tighter controls simultaneously with easier maintenance, repair or replacement of components is achieved. In some of the embodiments, components are located directly in the lateral. For example, a choke intended to control flow from a particular lateral or a flow venturi intended to measure flow from or to a particular lateral would be positioned in that lateral. A monitoring or control system however might be located in an ancillary bore and merely have sensors located in the lateral, or may simply have sensors exposed to the lateral (or the main bore) while not being directly in the lateral (or main bore). More particularly (see
Whether or not ancillary bores are utilized, the disclosure hereof specifically facilitates well control and monitoring control. These can be done alone or in combination. With these two concepts in place, any well configuration is handleable. Where multiple splitters are stacked, flows come from several different regions of a host formation, through lateral bores that extend thereinto. Because of the configuration taught herein, all of these flows are quantified, which then provides a true picture of one condition in the entire well. Where it is known, as in the system of this disclosure, (through monitor, control or both) what condition is prevailing at each of the laterals of a well the condition of the entire well must necessarily be known because it is the sum of its parts. In some embodiments hereof, each downhole control unit installed is addressable so that fewer or even one control line need be installed to communicate with one or more control and/or monitoring units or modules downhole.
Installation of the described device includes running the splitter 12 and cementing it in the wellbore (if a casing segment). If the particular splitter includes ancillary bore(s), dummy modules 30, 32 (as shown) may be installed therein to prevent debris from entering the ancillary bore(s), which might otherwise present difficulties with respect to installation of modules. A straddle wiper plug (not shown), as known in the art, may be employed to prevent cement entrance to profiles in the splitter if the splitter is a casing segment and intended to be cemented in place. In the casing splitter embodiment, once the splitter 12 is at depth it is cemented in place. A lateral bore may be drilled and lined, etc. and suitable device(s) installed. The device(s) may be, as noted above, a controller module, a monitoring module, an adjustable choke 24, a venturi, a combination of the foregoing or other downhole tools. These are installed in leg 18 to control flow between lateral leg 18 and the main bore. These can alternatively be installed in ancillary bores as noted above, in which case, not only will they not impede access down the main bore, but they also will not impede access down the lateral bore. Modules 30, 32 if used, may be installed with such tools as a diverter or kick over tool to replace one or both dummys. It should be noted that the splitter could be configured to accept two or more modules in a single module receptacle, if desired.
A very significant advantage of this system is that access to more downhole laterals of the well may be had without the need to remove devices connected with more uphole laterals.
The choke 24, which may be an adjustable choke and in one embodiment is variable from fully open to fully closed (thereby shutting off the lateral), is configured to land and be retained in lateral leg 18. Choke 24 is also retrievable. The configuration, in one embodiment employs a profile (see
While preferred embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
Claims
1. A lateral monitoring and/or control system comprising:
- at least one splitter having a lateral bore and a main bore;
- at least one control line at the splitter; and
- at least one of a choke module, monitoring module flow venturi module and a control module disposed in operable communication with the lateral bore and outside of the main bore.
2. A lateral monitoring and/or control system as claimed in claim 1 wherein the splitter further includes at least one ancillary bore.
3. A lateral monitoring and/or control system as claimed in claim 2 wherein at least one of the monitoring module and control module is disposed at the at least one ancillary bore.
4. A lateral monitoring and/or control system as claimed in claim 2 wherein the choke module or flow venturi module is disposed in the lateral bore and at least one of the monitoring module and the control module is disposed at the at least one ancillary bore.
5. A lateral monitoring and/or control system as claimed in claim 4 wherein the at least one ancillary bore is two ancillary bores.
6. A lateral monitoring and/or control system as claimed in claim 4 wherein the choke module or flow venturi module is disposed in the lateral bore and at least one of the monitoring module and the control module is disposed at one of the two ancillary bores.
7. A lateral monitoring and/or control system as claimed in claim 6 wherein the other of the monitoring module and the control module is disposed at the other of the two ancillary bores.
8. A lateral monitoring and/or control system as claimed in claim 2 wherein the at least one ancillary bore includes a pressure transmissive connection to at least one of the lateral bore and the main bore.
9. A lateral monitoring and/or control system as claimed in claim 8 wherein the pressure transmissive connection is a fluid transmissive connection.
10. A lateral monitoring and/or control system as claimed in claim 1 wherein the monitoring module monitors at least one of pressure, flow, temperature, chemical constituency and flow direction.
11. A lateral monitoring and/or control system as claimed in claim 1 wherein the splitter includes two ancillary bores each having at least one of the monitoring module and the control module and the lateral leg containing the choke module or the flow venturi module.
12. A lateral monitoring and/or control system as claimed in claim 1 wherein the choke module is remotely adjustable with respect to flow therethrough.
13. A lateral monitoring and/or control system as claimed in claim 1 wherein the system further comprises at least one control line accessing the at least one splitter.
14. A lateral monitoring and/or control system as claimed in claim 13 wherein the control line accesses a plurality of splitters.
15. A lateral monitoring and/or control system as claimed in claim 13 wherein the control line is at least one of fiber optic based, hydraulic based and electric based.
16. A lateral monitoring and/or control system as claimed in claim 14 wherein the control line is at least one of fiber optic based, hydraulic based and electric based.
17. A lateral monitoring and/or control system as claimed in claim 13 wherein the control line accesses each lateral bore and is disposed outside of the at least one splitter.
18. A lateral monitoring and/or control system as claimed in claim 13 wherein the control line is in operable communication with a plurality of addressable modules in a plurality of splitters for selective communication with such modules.
19. A lateral monitoring and/or control system as claimed in claim 2 wherein the at least one ancillary bore contains a dummy module to protect the at least one ancillary bore.
20. A method for controlling and/or monitoring of a multi-lateral well system comprising:
- installing one or more splitters in a borehole;
- installing at least one control line to communicate remotely with each of the one or more splitters; and
- selectively communicating with one or more of at least one of a monitoring module, a control module, a choke module and a flow venturi module.
21. The method for controlling and/or monitoring of a multi-lateral well system as claimed in claim 20 wherein the method further includes installing at least one of said at least one of a monitoring module, a control module, a choke module and a flow venturi module in a position outside a main bore of the one or more splitters.
Type: Application
Filed: Apr 21, 2006
Publication Date: Dec 28, 2006
Inventor: Douglas Murray (Humble, TX)
Application Number: 11/408,635
International Classification: E21B 47/00 (20060101); E21B 34/10 (20060101);