Dismounting tool for lower adjusting sleeve of large-size drill collar

Abstract

The utility model provides a disassembling tool for a lower adjusting sleeve of a large-size drill collar, which can penetrate into the drill collar to take out the lower adjusting sleeve, reduce the disassembling operation intensity and improve the disassembling efficiency, and comprises a thread male buckle seat, an ejection component, an extension rod and a connecting sleeve, a through hole is formed in the axis of the threaded male buckle seat, and the threaded male buckle seat is assembled at the drill collar male buckle end; the ejection assembly is fixedly assembled on the threaded male buckle seat, and a movable part of the ejection assembly performs rotary motion to linear motion in the through hole; one end of the extension rod is detachably connected with the movable part of the ejection assembly; one end of the connecting sleeve is detachably connected with the extension rod, and the outer wall, close to the end face, of the other end is provided with short threads connected with the drill collar lower adjusting sleeve; the outer wall of the connecting sleeve is provided with one or more centralizing areas.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and maintenance of oil drilling tools, and is particularly applicable to the design of efficient disassembly fixtures for the lower adjusting sleeve inside the drill collar. Background Technology

[0002] In practical applications of disassembling drill collar adjustment sleeves, the upper adjustment sleeve is easier to disassemble. It can be easily disassembled by using a simple tool to push out all the internal parts of the drill collar by pushing the pulse generator assembly on the lower end face of the drill collar. However, the lower adjustment sleeve cannot be pushed out and is more difficult to disassemble.

[0003] For example, when the depth of the drill collar end face exceeds 1m, conventional tools cannot effectively transmit the jacking force, limiting large-scale operations; at the same time, the disassembly force increases dramatically after the mud solidifies, and the large disassembly force required makes manual operation difficult and inefficient. Utility Model Content

[0004] The purpose of this utility model is to provide a disassembly tool for the lower adjustment sleeve of a large-size drill collar, which can remove the lower adjustment sleeve from inside the drill collar through modular design, reduce the intensity of the disassembly operation of the lower adjustment sleeve, and improve the disassembly efficiency.

[0005] The embodiments of this utility model are implemented as follows:

[0006] A tooling for disassembling the lower adjusting sleeve of a large-size drill collar, comprising:

[0007] The threaded male thread seat has a through hole in its axial center and is assembled to the male thread end of the drill collar;

[0008] The ejector assembly is fixedly mounted on the threaded male seat, and the movable part of the ejector assembly rotates or moves linearly within the through hole;

[0009] The extension rod is detachably connected at one end to the movable part of the ejector assembly.

[0010] The connecting sleeve has one end detachably connected to the extension rod, and the other end is provided with a short-tooth thread on the outer wall near the end face to connect to the lower adjustment sleeve of the drill collar; the outer wall of the connecting sleeve has one or more straightening zones.

[0011] In a preferred embodiment of this utility model, the ejection component includes:

[0012] The ball screw has a flange that is detachably connected to the end face of the threaded male seat, and the screw of the ball screw passes through the flange and is inserted into the through hole.

[0013] A lead screw adapter, the central shaft of which is provided with a threaded hole for the lead screw to pass through;

[0014] A thrust bearing, the outer ring of which is fixedly connected to the inner wall of a through hole;

[0015] The bearing rod has a slender cylindrical shape at one end, which passes through the inner ring of the thrust bearing and connects to the lead screw adapter; the other end is a cylindrical groove, and the internal central shaft is provided with a first internal thread groove that is detachably connected to the extension rod; when the screw rotates, it pushes out the bearing rod.

[0016] In a preferred embodiment of this utility model, the aforementioned lead screw adapter is cylindrical in shape, with a first slot at one end for threaded connection to a screw, and a second slot at the other end for connection to a bearing rod. The inner diameter of the first slot is larger than the inner diameter of the second slot, and the bearing rod is inserted into the first slot. The inner wall of the first slot is provided with internal threads.

[0017] In a preferred embodiment of the present invention, the extension rod has a threaded section at one end, a snap-fit ​​section at the other end, and a smooth middle section.

[0018] In a preferred embodiment of the present invention, a connecting post is provided at one end of the connecting sleeve, and a snap-fit ​​groove for connecting the extension rod is provided at the central axis position of the connecting post.

[0019] In a preferred embodiment of this utility model, the above-mentioned short-pitch thread is a short-pitch ACME thread.

[0020] In a preferred embodiment of this utility model, the threaded groove and the lower adjusting sleeve are clearance fits with a tolerance of 5H / 5g6g or 7H / 7g6g.

[0021] In a preferred embodiment of this utility model, the aforementioned lead screw adapter and thrust bearing are fixedly assembled on the threaded male thread seat.

[0022] In a preferred embodiment of the present invention, the ball screw has a variable lead.

[0023] In a preferred embodiment of this utility model, a brushless motor is directly connected to the ball screw.

[0024] The beneficial effects of this utility model embodiment are:

[0025] 1. The design of the threaded male socket is consistent with the structure of the drill collar male socket, which ensures the coaxiality of the ejection assembly and the stability of the tooling; the outer walls of the threaded male socket and the connecting sleeve are in contact with the inner wall of the drill collar, which facilitates tooling alignment and reduces the risk of off-center load.

[0026] 2. The configured extension rod can transmit the jacking force to the lower adjustment sleeve of more than 1 meter. By connecting the lower adjustment sleeve, it is possible to reach and stably connect the lower adjustment sleeve located at the large size, so that the lower adjustment sleeve can be removed smoothly.

[0027] 3. The designed ejection assembly can convert rotational motion into linear motion, and convert a large linear disassembly force into a small rotational disassembly force; standardized interfaces are used between the components for quick assembly and disassembly;

[0028] 4. The whole adopts a modular design. The initial disassembly force can be overcome with a 10mm ejection stroke. Then, the lower adjustment sleeve is brought out together during the disassembly process, which is very convenient to use. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the lower adjusting sleeve disassembly tooling assembled on the drill collar according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the disassembly fixture for the lower adjusting sleeve according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the bearing rod structure according to an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the connecting sleeve structure according to an embodiment of the present utility model;

[0034] Icons: 1. Threaded male seat; 11. Through hole; 12. Bushing; 2. Extension rod; 21. Threaded section; 22. Snap-fit ​​section; 3. Connecting sleeve; 31. Snap-fit ​​groove; 32. External thread; 33. Alignment zone; 34. Connecting column; 4. Lower adjusting sleeve; 5. Ball screw; 51. Flange; 52. Screw; 6. Screw adapter; 7. Thrust bearing; 8. Bearing rod; 81. Slender column; 82. First internal thread groove. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] First Embodiment

[0042] Please see Figure 1-4 This embodiment provides a disassembly tool for a large-size drill collar lower adjustment sleeve. The large size in this embodiment is a drill collar lower adjustment sleeve with a diameter greater than or equal to 100mm, which includes a threaded male seat 1, an ejector assembly, an extension rod 2 and a connecting sleeve 3 connected in sequence.

[0043] Specifically, the threaded male thread seat 1 has a structure in which the end face of a cylinder extends coaxially to form a frustum. The overall shape matches the internal shape of the male thread end face of the drill collar. The outer wall of the threaded male thread seat 1 is designed with threads. Since the threads inside the drill collar adopt the API standard NC series digital threads, the threads of the male thread seat also use the matching API standard digital series threads, so that the threaded male thread seat 1 can be stably assembled on the male thread end of the drill collar.

[0044] A through hole 11 is provided at the axial position of the threaded male seat 1 for assembling the ejector assembly. Furthermore, in order to reduce wear of the ejector assembly and the threaded male seat 1, fix the position, provide lubrication, dissipate heat, and reduce friction, a modular bushing 12 can also be designed inside the through hole 11.

[0045] In this embodiment, the ejector assembly serves as an important component for the transmission power of the lower adjusting sleeve 4. It is fixedly mounted on the threaded male buckle seat 1, and the movable part of the ejector assembly rotates and then moves linearly within the through hole 11, converting the larger linear disassembly force into a smaller rotational disassembly force.

[0046] Specifically, the ejector assembly includes a ball screw 5, a screw adapter 6, a thrust bearing 7, and a bearing rod 8 arranged sequentially. The flange 51 of the ball screw 5 is mounted to the end face of the threaded male seat 1 via detachable connectors such as bolts or screws. The screw 52 of the ball screw 5 passes through the flange 51 and is inserted into the through hole 11. The screw adapter 6 connects the screw 52 and the bearing rod 8. This connection method simplifies the installation process, ensures precise fit between the components, and reduces unnecessary friction.

[0047] A threaded hole for the screw 52 to pass through is provided at the central shaft position of the ball screw adapter 6 to ensure precise transmission. The ball screw converts rotary motion into linear motion, thereby enabling the bearing rod 8 to be pushed out.

[0048] In practice, we found that the disassembly force of the maintenance drill collar and adjusting sleeve increases significantly after the mud dries. Once loosened, the subsequent disassembly force decreases significantly. To save tooling costs and reduce tooling volume, the ball screw stroke is designed to be only a very small segment. Preferably, the ejection stroke of the ejection assembly is 8-15mm. In this embodiment, a precision ball screw with a lead of 4-6mm is used, and a 10mm ejection stroke is sufficient to overcome the initial disassembly force.

[0049] The lead screw adapter 6 is cylindrical in shape. One end has a first slot for threaded connection with the screw 52, ​​and the other end has a second slot for slidable connection with the bearing rod 8. The inner diameter of the first slot is larger than that of the second slot. The bearing rod 8 partially passes through the first slot, and the inner wall of the first slot has internal threads. Here, the first slot is used to connect the screw 52, ​​and the second slot is used for the assembly, limiting, and guiding of the bearing rod 8.

[0050] Alternatively, the end of the ball screw 5 can be designed as a stepped type, that is, a rod body is coaxially provided at the end of the screw 52, ​​which can push the bearing rod 8 out through the second slot. In this way, it is not necessary for part of the bearing rod 8 to be inserted into the first slot.

[0051] One end of the bearing rod 8 is a slender cylindrical body 81. To protect the bearing rod 8 from the axial thrust of the screw 52, ​​a thrust bearing 7 is also provided at one end of the slender cylindrical body 81. The inner ring of the thrust bearing 7 is connected to the lead screw adapter 6, and the outer ring of the thrust bearing 7 is fixedly connected to the inner wall of the through hole 11. At the same time, to enhance the reliability of the tooling under low-temperature conditions, the cavity of the thrust bearing 7 is filled with low-temperature grease with a viscosity ≤150cSt at -40℃. The other end of the bearing rod 8 is a cylindrical groove with a first internal thread groove 82 on the internal central shaft, which is detachably connected to the extension rod 2; thus, when the screw 52 rotates, the bearing rod 8 is safely and stably pushed out.

[0052] The extension rod 2 has a rod structure with a threaded section 21 at one end, a snap-fit ​​section 22 at the other end, and a smooth middle section. One end connects to the movable part of the ejector assembly, so that when the bearing rod 8 is ejected, the extension rod can also move linearly within the drill collar and be ejected. The extension rod 2 can be made of duplex stainless steel, such as 2205 DSS, which is resistant to Cl. - Corrosion resistance improved by 60%.

[0053] The connecting sleeve 3 is the main component connecting the lower adjusting sleeve 4. Its two ends are respectively provided with snap-fit ​​grooves 31 and external threads 32 for connecting the extension rod 2 and the lower adjusting sleeve 4 of the drill collar. The outer wall of the connecting sleeve 3 is provided with a centering zone 33, so that the connecting sleeve 3 is centered in the drill collar cavity. Under the action of the ejection assembly, the lower adjusting sleeve 4 of the drill collar is ejected.

[0054] Specifically, one end of the connecting sleeve 3 has a connecting post 34 protruding outward, and the central axis of the connecting post 34 has a snap-fit ​​groove 31 for connecting the extension rod 2. The specific structure of the snap-fit ​​groove 31 is not limited. The other end of the connecting post 34 has an external thread 32 for connecting the lower adjusting sleeve 4 on its outer wall near the end face.

[0055] Because the lower adjusting sleeve 4 has a thin wall, in this embodiment, a short-pitch ACME thread is selected for the thread groove, with a thread height of 50%-70% of that of a standard ACME thread. This facilitates connection while protecting the lower adjusting sleeve 4. The thread pitch is selected according to the ACME thread standard and matched to the outer diameter. The thread groove and the lower adjusting sleeve 4 are clearance fits, with tolerances of 5H / 5g6g or 7H / 7g6g, to accommodate mud residue.

[0056] To ensure a quick and effective connection between the connecting sleeve 3 and the lower adjusting sleeve 4, the outer diameter of the connecting sleeve 3 matches the inner diameter of the drill collar, and one or more centering zones 33 are provided on the outer wall of the connecting sleeve 3. In this embodiment, a centering zone 33 is provided at each end of the outer wall of the connecting sleeve 3 with the maximum diameter.

[0057] To enhance the reliability of the tooling in highly corrosive mud environments, the connecting sleeve 3 is also treated with a PTFE coating with a thickness of 50-80μm to reduce mud adhesion.

[0058] The method of using the disassembly tool for the lower adjusting sleeve 4 is as follows:

[0059] Insert the extension rod 2 into the snap-fit ​​groove 31 of the connecting sleeve 3. After the two are fixedly assembled, hold one end of the extension rod 2 and insert the connecting sleeve 3 into the drill collar. During the insertion process, the straightening area 33 of the connecting sleeve 3 contacts the inner wall of the drill collar.

[0060] Manually rotate the extension rod 2 to engage the ACME thread of the connecting sleeve 3 with the lower adjusting sleeve 4;

[0061] Assemble the bearing rod 8 onto the extension rod 2, and then assemble the thrust bearing 7 and the lead screw adapter 6 in sequence.

[0062] Install the threaded male seat 1 on the end face of the drill collar, assemble the ball screw 52 onto the screw adapter 6, and then fix the flange 51 of the ball screw onto the threaded male seat 1 with screws. The tooling assembly is then complete.

[0063] Rotating the lead screw produces a 10mm push-out stroke. After loosening the lower adjusting sleeve 4, the removal work can begin. The method is as follows:

[0064] Disassemble the ball screw, threaded male seat 1, screw adapter 6, thrust bearing 7 and bearing rod 8 in sequence;

[0065] Pull the extension rod 2 directly by hand to pull out the extension rod 2, connecting sleeve 3 and lower adjusting sleeve 4 together.

[0066] The operation time has been reduced from 2-3 hours to 20-30 minutes, greatly improving work efficiency.

[0067] Second Embodiment

[0068] This embodiment further optimizes the first embodiment. For different specifications of drill collars (such as API NC series, IF series, etc.) and the size of the lower adjusting sleeve 4, this embodiment can further modularize the threaded male socket 1. This can be achieved by using the threaded male socket 1 with different replaceable threaded bushings, such as NC50, NC38, etc. The replaceable threaded bushings can be locked by spring pins or snap fasteners.

[0069] A dedicated bushing 12 is designed at the through hole 11 to fix the lead screw adapter 6 and the thrust bearing 7 together, and to further modularize the threaded male seat 1 as a whole, which can save assembly and disassembly time and improve assembly accuracy.

[0070] The method of using the disassembly tooling for adjusting sleeve 4 in this embodiment is as follows:

[0071] Insert the extension rod 2 into the snap-fit ​​groove 31 of the connecting sleeve 3. After the two are fixedly assembled, hold one end of the extension rod 2 and insert the connecting sleeve 3 into the drill collar. During the insertion process, the straightening area 33 of the connecting sleeve 3 contacts the inner wall of the drill collar.

[0072] Manually rotate extension rod 2 to engage ACME threaded connection with lower adjusting sleeve 4;

[0073] Assemble the bearing rod 8 onto the extension rod 2, install the threaded male thread seat 1 on the end face of the drill collar, assemble the ball screw 52 onto the screw adapter 6, and then fix the flange 51 of the ball screw onto the threaded male thread seat 1 with screws. The tooling assembly is now complete.

[0074] The disassembly method is as follows: disassemble the ball screw, threaded male seat 1, and bearing rod 8 in sequence;

[0075] Pull the extension rod 2 directly by hand to pull out the extension rod 2, connecting sleeve 3 and lower adjusting sleeve 4 together.

[0076] Third Embodiment

[0077] To further improve the disassembly efficiency of the lower adjusting sleeve 4, the screw 52 of the ball screw can also be improved. In this embodiment, the screw 52 has a high torque section and a fast ejection section, with lead of 4m and 6mm for each section, respectively, thus shortening the operation time.

[0078] Fourth embodiment

[0079] This embodiment uses an electric drive to control the ball screw, employing an integrated power module that directly connects the ball screw 5 to the brushless motor. It has a built-in lithium battery pack, providing a runtime of ≥4 hours. This reduces manual operation and facilitates ball screw assembly and resetting. The motor also features built-in speed regulation and emergency reverse functions.

[0080] This tooling solution, through its innovative structural design, successfully solves traditional technical challenges such as disassembling the lower adjusting sleeve with four deep holes (>1m), high initial disassembly force (>50kN), and mud curing and bonding. It has significant technological advancements and economic advantages in the field of oil drilling and production equipment maintenance.

[0081] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0082] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A disassembly tooling for the lower adjusting sleeve of a large-size drill collar, characterized in that, include: A threaded male thread holder, wherein the axis of the threaded male thread holder is provided with a through hole and is assembled to the male thread end of the drill collar; The ejector assembly is fixedly mounted on the threaded male seat, and the movable part of the ejector assembly rotates and then moves linearly within the through hole; The extension rod has one end detachably connected to the movable part of the ejection assembly; The connecting sleeve has one end detachably connected to the extension rod, and the other end is provided with a short-tooth thread on the outer wall near the end face to connect to the lower adjustment sleeve of the drill collar; the outer wall of the connecting sleeve has one or more straightening zones.

2. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 1, characterized in that, The ejection component includes: A ball screw, wherein the flange of the ball screw is detachably connected to the end face of the threaded male seat, and the screw of the ball screw passes through the flange and is inserted into the through hole; A lead screw adapter, wherein the central shaft of the lead screw adapter is provided with a threaded hole for the lead screw to pass through; A thrust bearing, wherein the outer ring of the thrust bearing is fixedly connected to the inner wall of the through hole; The bearing rod has a slender cylindrical shape at one end, which passes through the inner ring of the thrust bearing and connects to the lead screw adapter; the other end is a cylindrical groove with a first internal thread groove on the central shaft inside, which is detachably connected to the extension rod; when the screw rotates, it pushes out the bearing rod.

3. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 2, characterized in that, The lead screw adapter is cylindrical in shape. One end is provided with a first slot for threaded connection with the screw, and the other end is provided with a second slot for connection with the bearing rod. The inner diameter of the first slot is larger than the inner diameter of the second slot. The bearing rod is inserted into the first slot, and the inner wall of the first slot is provided with internal threads.

4. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 2, characterized in that, The extension rod has a threaded section at one end, a snap-fit ​​section at the other end, and a smooth middle section.

5. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 4, characterized in that, One end of the connecting sleeve is provided with a connecting post, and the central axis of the connecting post is provided with a snap-fit ​​groove for connecting the extension rod.

6. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 1, characterized in that, The short-pitch thread is a short-pitch ACME thread.

7. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 5, characterized in that, The threaded groove and the lower adjusting sleeve are clearance fits with a tolerance of 5H / 5g6g or 7H / 7g6g.

8. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 2, characterized in that, The lead screw adapter and thrust bearing are fixedly assembled to the threaded male socket.

9. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 2, characterized in that, The ball screw has a variable lead.

10. The disassembly fixture for the large-size drill collar lower adjusting sleeve according to claim 2, characterized in that, The ball screw is directly connected to a brushless motor.

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