DOWNHOLE TOOL ASSEMBLIES WITH SELECTIVELY ORIENTABLE AND LOCKABLE MEMBERS
Downhole tool assemblies having mule shoe members housed within UBHO sub members being secured by fastening members and methods thereof are disclosed. A lower portion of the mule shoe member has many apertures disposed circumferentially around an external surface that are aligned with openings present in the UBHO sub member to achieve a specified orientation. Fastening members releasably engage and couple the apertures with the openings thereby securely locking the mule shoe member within the UBHO sub member in the specified orientation. Set screws having an elongated dowel member protruding from a centre of a face at a bottom end are disclosed. The dowel member is coaxial with the body of the screw having a lesser width and is configured for being substantially seated within a receiving member for providing a positive lock.
The present disclosure claims priority from pending U.S. Provisional Patent application No. 62/352,017 filed on: 20 Jun. 2016, the pending application being incorporated in its entirety into the present application, to the extent not inconsistent with the disclosure herein.
TECHNICAL FIELDThe present disclosure generally relates to tools used in directional drilling of oil wells. More particularly, the present disclosure relates to selectively orientable and lockable downhole tool assemblies and methods thereof.
BACKGROUNDDuring directional drilling of wells, it is essential that the bottom hole assembly in the drill string is maintained in the correct orientation. It is of utmost importance that the helical face inside the mule shoe, which is in turn, inside the UBHO sub, is in perfect line with the bend in the drilling motor, known as the ‘high side’. In present conventional designs used in the industry, the mule shoe is held inside the UBHO sub by means of two or more set screws. These set screws sit on a knurled surface on the mule shoe, thereby preventing the mule shoe from rotating inside the UBHO sub. However, the set screws rely mainly on friction to do this. The amount of vibrations in downhole conditions is very high and this can easily magnify and cause the set screws to come lose and disorient the mule shoe. This in turn, would completely change the direction in which the drilling is happening and correct directional data cannot be relayed back to the surface. This leads to a very expensive mistake which can take a long time to fix.
In the light of aforementioned discussion, there exists a need for downhole tool assemblies, wherein the mule shoe is securely locked within the UBHO sub. The above mentioned problem is solved by the present invention that discloses downhole tool assemblies having mule shoes that can be selectively oriented to a specified angle and positively locked within the UBHO sub in the desired orientation. The mule shoes are provided with many apertures circumferentially disposed around the external surface that enables selective orientation of the mule shoe with up to 10 degree increments. The rib of the mule shoe is aligned with the “high side” marked on the UBHO sub and then the mule shoes are securely locked within the UBHO sub in the desired orientation by means of fastening members. These tool assemblies with a positive lock can withstand the high vibrations during the drilling process. In some embodiments, the fastening members are set screws with protruding dowel members that are seated inside the apertures present in the mule shoes. This makes it highly improbable that orientation will ever be lost during directional drilling, thereby reducing risk, increasing efficiency and ensuring significant cost savings.
SUMMARYThe following presents a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and it does not identify key/critical elements of the invention or delineate the scope of the invention. Its sole purpose is to present some concepts disclosed herein in a simplified form as a prelude to the more detailed description that is presented later.
Exemplary embodiments of the present disclosure are directed towards downhole tool assemblies for directional drilling of wells. The tool assembly has an elongated, substantially cylindrical hollow mule shoe member housed within a longitudinal bore of an elongated, substantially cylindrical hollow UBHO sub member, the mule shoe member being secured by means of fastening members. The hollow mule shoe member has an upper portion and a lower portion. The upper portion has one or more ribs extending longitudinally. The lower portion has many apertures disposed circumferentially around an external surface. The lower portion also has a base that is supported by a projection on an inner surface of the UBHO sub member. The UBHO sub member has a proximal portion and a distal portion. The distal portion has the projection that supports the base. The distal portion further has two or more openings extending therethrough perpendicular to the longitudinal axis of the UBHO sub member. The openings of the UBHO sub member are aligned with corresponding apertures in the mule shoe member. The fastening members releasably engage and couple the openings with the apertures thereby securely locking the mule shoe member within the UBHO sub member in a specified orientation. The downhole tool assembly is configured for selective orientation of the mule shoe member to a specified angle and positive locking of the mule shoe member within the UBHO sub member in the desired orientation.
Other exemplary embodiments of the present subject matter are directed towards set screws that serve as fastening members for providing a positive lock. The set screw consists of an elongated, substantially cylindrical threaded body with a top end and a bottom end. The bottom end has an elongated dowel member protruding from the centre of a face. The dowel member is coaxial with the body having a width that is lesser than the width of the body. The dowel member is configured to be substantially seated within a suitable receiving member such as the blind holes of mule shoes thereby providing a positive lock.
Other exemplary embodiments of the present subject matter are directed towards methods for selectively orienting and locking a mule shoe member within an UBHO sub member. The method begins with the step of providing an elongated, substantially cylindrical hollow mule shoe member. The hollow mule shoe member has an upper portion and a lower portion. The upper portion has one or more ribs extending longitudinally, wherein one of the rib houses a key slot for receiving a key member for securing the mule shoe member with an inner assembly. The lower portion has many apertures disposed circumferentially around an external surface and a base. The next step is providing an elongated substantially cylindrical hollow UBHO sub member with a longitudinal bore that is configured to house the mule shoe member within the bore. The UBHO sub member has a proximal portion and a distal portion. The distal portion has a projection on an inner surface that is configured to support the base. The distal portion further has two or more openings extending therethrough perpendicular to the longitudinal axis of the UBHO sub member. The openings of the UBHO sub member are configured to be aligned with corresponding apertures in the mule shoe member. The next step is threadably engaging the distal portion of the UBHO sub member to a bottom hole component of a drill string thus disposing the UBHO sub member above a downhole motor. This is followed by positioning the mule shoe member within the bore, the base of the mule shoe member being supported by the projection. Then the mule shoe member is rotated within the bore such that the rib is aligned with a high side marked on the UBHO sub member thus orienting the mule shoe member to a specified angle and aligning the aperture of the mule shoe member with the opening of the UBHO sub member. The next step is providing one or more of fastening members such as set screws followed by securely and positively locking the mule shoe member within the bore in the desired orientation by means of the fastening member, the fastening member thereof releasably engaging and coupling the opening with the aperture.
It is an object of the present invention to disclose downhole tool assemblies having mule shoes that can be selectively oriented and positively locked within the UBHO sub thereby ensuring that correct orientation is maintained during directional drilling.
Other objects of the present invention are to disclose downhole tool assemblies that increase efficiency and ensure significant cost savings.
Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments, in conjunction with the accompanying drawings, wherein like reference numerals have been used to designate like elements, and wherein:
It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
The use of “including”, “comprising” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. Further, the use of terms “first”, “second”, and “third”, and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
According to different non limiting exemplary embodiments of the present disclosure, downhole tool assemblies for directional drilling of wells are disclosed.
In accordance with different non limiting exemplary embodiments of the present subject matter, methods for selectively orienting and locking mule shoes within UBHO subs are disclosed.
According to different non limiting exemplary embodiments of the present disclosure, set screws for providing positive lock are disclosed.
The downhole tool assembly comprises of a mule shoe member housed within an UBHO sub member that is secured by means of fastening members. The mule shoe member has a plurality of apertures that are disposed circumferentially around an external knurled surface. These apertures are aligned with the openings in the UBHO sub member based on the desired orientation followed by positive locking of the mule shoe member within the UBHO sub by means of fastening members. The apertures of the mule shoe can be in the form of holes, blind holes, longitudinal slots or any other form that can receive and engage a portion of the fastening member without limiting the scope of the present disclosure. The orientation, number and position of apertures of the mule shoe can vary depending on the openings present in the UBHO sub member without limiting the scope of the present disclosure. The orientation, number and position of the openings in the UBHO sub can vary without limiting the scope of the present disclosure.
In a particular embodiment, the fastening member is a uniquely designed set screw though any other fastener that is known in the art such as regular set screws, other kinds of screws, pins or rods that can couple the mule shoe member with the UBHO sub member can be used without limiting the scope of the present disclosure. The dimensions and other parameters of the fastener receiving openings of the UBHO sub and the apertures of the mule shoe would vary corresponding to the kind of fasteners that are used to efficiently engage the fastening members and for providing a secure lock.
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It is to be noted that the entire downhole tool assembly can be adapted to be used in an upside down orientation also but with the same function and for the same purpose.
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A different variation of the UBHO threaded opening is envisaged wherein, the threaded portion starts deeper down into the opening and has a groove above it to receive an internal retaining member for ensuring that the set screw doesn't ‘back off’ and lose its grip on the knurled section of the mule shoe and to ensure that the dowel in the set screw doesn't come out of the blind hole on the mule shoe.
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According to different exemplary embodiments of the present subject matter, methods for selectively orienting and locking a mule shoe member within an UBHO sub member are disclosed. The method begins with the step of providing an elongated, substantially cylindrical hollow mule shoe member. The hollow mule shoe member has an upper portion and a lower portion. The upper portion has one or more ribs extending longitudinally, wherein one of the rib houses a key slot for receiving a key member for securing the mule shoe member with an inner assembly. The lower portion has many apertures disposed circumferentially around an external surface and a base. The next step is providing an elongated substantially cylindrical hollow UBHO sub member with a longitudinal bore that is configured to house the mule shoe member within the bore. The UBHO sub member has a proximal portion and a distal portion. The distal portion has a projection on an inner surface that is configured to support the base. The distal portion further has two or more openings extending therethrough perpendicular to the longitudinal axis of the UBHO sub member. The openings of the UBHO sub member are configured to be aligned with corresponding apertures in the mule shoe member. The next step is threadably engaging the distal portion of the UBHO sub member to a bottom hole component of a drill string thus disposing the UBHO sub member above a downhole motor. This is followed by positioning the mule shoe member within the bore, the base of the mule shoe member being supported by the projection. Then the mule shoe member is rotated within the bore such that the rib is aligned with a “high side” marked on the UBHO sub member thus orienting the mule shoe member to a specified angle and aligning the aperture of the mule shoe member with the opening of the UBHO sub member. The next step is providing one or more of fastening members such as set screws followed by securely and positively locking the mule shoe member within the bore in the desired orientation by means of the fastening member, the fastening member thereof releasably engaging and coupling the opening with the aperture. In a particular embodiment, the method further comprises of providing a retaining member such as retaining clips. In a particular embodiment, the step of orienting the mule shoe member to a specified angle is carried out with about +/−10 degree increments.
Although the present disclosure has been described in terms of certain preferred embodiments and illustrations thereof, other embodiments and modifications to preferred embodiments may be possible that are within the principles and spirit of the invention. The above descriptions and figures are therefore to be regarded as illustrative and not restrictive.
Thus the scope of the present disclosure is defined by the appended claims and includes both combinations and sub combinations of the various features described herein above as well as variations and modifications thereof, which would occur to persons skilled in the art upon reading the foregoing description.
Claims
1. A downhole tool assembly for directional drilling of wells comprising:
- a) an elongated substantially cylindrical hollow mule shoe member, the mule shoe member thereof having an upper portion and a lower portion, the upper portion having a plurality of a rib extending longitudinally, the lower portion thereof having a plurality of an aperture and a base, the aperture being disposed circumferentially around an external surface of the lower portion;
- b) an elongated substantially cylindrical hollow UBHO sub member having a longitudinal bore, the UBHO sub member thereof housing the mule shoe member within the bore, the UBHO sub member further having a proximal portion and a distal portion, the distal portion thereof having a projection on an inner surface, the projection thereof supporting the base, the distal portion thereof further having at least one of an opening extending therethrough perpendicular to the longitudinal axis of the UBHO sub member, the opening thereof being aligned with the aperture; and
- c) a plurality of a fastening member, the fastening member thereof releasably engaging and coupling the opening with the aperture, the fastening member thereof being configured to securely lock the mule shoe member within the UBHO sub member in a specified orientation, the downhole tool assembly thereof being configured for selective orientation of the mule shoe member to a specified angle and positive locking of the mule shoe member within the UBHO sub member in the desired orientation.
2. The downhole tool assembly as claimed in claim 1, wherein the apertures are 36 in number and equally spaced for selectively orienting the mule shoe member to a specified angle with about 10 degree increments.
3. The downhole tool assembly as claimed in claim 1, wherein the aperture is a blind hole.
4. The downhole tool assembly as claimed in claim 3, wherein the aperture is a longitudinal slot.
5. The downhole tool assembly as claimed in claim 1, wherein the fastening member is a set screw.
6. The downhole tool assembly as claimed in claim 5, wherein the set screw comprises of an elongated substantially cylindrical threaded body, the body thereof comprising a top end and a bottom end, the bottom end thereof having an elongated dowel member protruding from the center of a face, the dowel member thereof being coaxial with the body, the dowel member having a width associated therewith, the width thereof being lesser than a width of the body, the dowel member thereof being configured to be substantially seated within the aperture thereby providing a positive lock.
7. The downhole tool assembly as claimed in claim 6, wherein the face being curved inward, the bottom end thereof having a sharp biting feature at an edge, the biting feature thereof being configured to bite into a knurled surface of the lower portion thereby further providing a friction lock.
8. The downhole tool assembly as claimed in claim 7, wherein the top end has a head, the head having a width associated therewith, the width thereof being greater than the width of the body, the head being configured to be seated over a corresponding step within the opening.
9. The downhole tool assembly as claimed in claim 1, further comprising a retaining member, the retaining member thereof being disposed above a top surface of the fastening member and being configured to retain the fastening member in position.
10. The downhole tool assembly as claimed in claim 9, wherein the retaining member is a retaining clip and wherein the UBHO sub member has a mating groove within the opening to receive the retaining clip.
11. A set screw for providing a positive lock comprising an elongated substantially cylindrical threaded body, the body thereof comprising a top end and a bottom end, the bottom end thereof having an elongated dowel member protruding from the center of a face, the dowel member thereof being coaxial with the body, the dowel member having a width associated therewith, the width thereof being lesser than a width of the body, the dowel member thereof being configured to be substantially seated in a suitable receiving member thereby providing a positive lock.
12. The set screw as claimed in claim 11, wherein the face being curved inward, the bottom end thereof having a sharp biting feature at an edge, the biting feature thereof configured to bite into a knurled surface thereby further providing a friction lock.
13. The set screw as claimed in claim 12, wherein the top end has a head, the head having a width associated therewith, the width thereof being greater than the width of the body, the head being configured to be seated over a corresponding step within a mating member.
14. A method for selectively orienting and locking a mule shoe member comprising:
- a) Providing an elongated substantially cylindrical hollow mule shoe member, the mule shoe member thereof having an upper portion and a lower portion, the upper portion thereof having a plurality of a rib extending longitudinally, wherein at least one of the rib houses a key slot for receiving a key member, the key member being configured to secure the mule shoe member with an inner assembly, the lower portion thereof having a plurality of an aperture and a base, the aperture being disposed circumferentially around an external surface of the lower portion;
- b) Providing an elongated substantially cylindrical hollow UBHO sub member having a longitudinal bore, the UBHO sub member thereof being configured to house the mule shoe member within the bore, the UBHO sub member further having a proximal portion and a distal portion, the distal portion thereof having a projection on an inner surface, the projection thereof being configured to support the base, the distal portion thereof further having at least one of an opening extending therethrough perpendicular to the longitudinal axis of the UBHO sub member, the opening thereof being configured to be aligned with the aperture;
- c) threadably engaging the distal portion to a bottom hole component of a drill string, the UBHO sub member thereof being disposed above a downhole motor;
- d) positioning the mule shoe member within the bore, the base thereof being supported by the projection;
- e) rotating the mule shoe member within the bore such that the rib is aligned with a high side on the UBHO sub member, the mule shoe member thereof being oriented to a specified angle and the aperture thereof being aligned with the opening;
- f) providing a plurality of a fastening member; and
- g) securely and positively locking the mule shoe member within the bore in the desired orientation by means of the fastening member, the fastening member thereof releasably engaging and coupling the opening with the aperture.
15. The method as claimed in claim 14, wherein the step of orienting the mule shoe member to a specified angle is carried out with about 10 degree increments.
16. The method as claimed in claim 14, further comprising providing a retaining member, the retaining member thereof being positioned above a top surface of the fastening member and being configured to retain the fastening member in position.
17. The method as claimed in claim 16, wherein the retaining member is a retaining clip and wherein the UBHO sub member has a mating groove within the opening to receive the retaining clip.
18. The method as claimed in claim 14, wherein the apertures are 36 in number and equally spaced for selectively orienting the mule shoe member to a specified angle with about 10 degree increments.
19. The method as claimed in claim 14, wherein the aperture is a blind hole.
20. The method as claimed in claim 19, wherein the aperture is a longitudinal slot.
21. The method as claimed in claim 14, wherein the fastening member is a set screw.
22. The method as claimed in claim 21, wherein the set screw comprises of an elongated substantially cylindrical threaded body, the body thereof comprising a top end and a bottom end, the bottom end thereof having an elongated dowel member protruding from the center of a face, the dowel member thereof being coaxial with the body, the dowel member having a width associated therewith, the width thereof being lesser than a width of the body, the dowel member thereof being configured to be substantially seated within the aperture thereby providing a positive lock.
23. The method as claimed in claim 22, wherein the face being curved inward, the bottom end thereof having a sharp biting feature at an edge, the biting feature thereof being configured to bite into a knurled surface of the lower portion thereby further providing a friction lock.
24. The method as claimed in claim 23, wherein the top end has a head, the head having a width associated therewith, the width thereof being greater than the width of the body, the head being configured to be seated over a corresponding step on a mating member.
Type: Application
Filed: Jun 20, 2017
Publication Date: Dec 20, 2018
Inventors: Subhra Kanchan Dey (Richmond, TX), Balaji Sundarraj (Sugar Land, TX), Christopher Holmes (Houston, TX)
Application Number: 15/627,465