Variable-diameter stabilizer

Abstract

The utility model belongs to the technical field of oil field drilling tools, and particularly relates to a variable-diameter stabilizer, which aims to solve the technical problem that the diameter of the stabilizer is mostly fixed in the prior art, and comprises a shell, a central tube, a driving component, a convex part and a concave part, a mounting groove communicated with the shell is formed in the side wall of the shell, and the central tube is arranged in the mounting groove. A pushing block is embedded in the mounting groove in a sliding manner; the central pipe is embedded in the shell in a sliding manner; the driving assembly is arranged in the shell and used for driving the center pipe to move in the axial direction of the shell. The protruding part is arranged at the end, facing the center pipe, of the pushing block, the concave part is arranged on the side wall of the center pipe, and the shape of the protruding part is matched with that of the concave part. According to the utility model, the diameter change of the stabilizer can be realized through the movement of the central pipe according to the matching of the convex part and the concave part, so that the diameter change is realized.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield drilling tool technology, specifically relating to a variable diameter stabilizer. Background Technology

[0002] A stabilizer is a device used to maintain the smooth operation of a slender drill pipe as it rotates at high speed within the borehole, keeping the drill bit axis as close as possible to the borehole centerline. Also known as a centralizer, it is a crucial tool in oil, gas, and geological exploration drilling to prevent well deviation. Its stabilizing function primarily reduces severe radial and axial vibrations of the drill pipe's elastic system within the borehole; minimizes drill bit and drill pipe wear; ensures core quality; and prevents well deviation or facilitates manual directional drilling. The stabilizer has a relatively simple structure, consisting of a large-diameter joint with ribbed plates (straight or spiral). Stabilizers can be categorized into drill string type and bottom hole type.

[0003] During drilling, stabilizers are installed on the drill collar to control the wellbore trajectory and prevent well deviation. When traditional drilling tools are affected by formation conditions and drilling techniques, making it difficult to follow the predetermined drilling trajectory, a common method is to change the diameter of the downhole stabilizer to increase, stabilize, or decrease the wellbore deviation.

[0004] The diameter of most existing stabilizers is fixed, which requires frequent tripping in and out of the drill string, greatly increasing drilling costs and reducing drilling efficiency. Utility Model Content

[0005] In order to address the problem that in the existing technologies, the diameter of the stabilizer is mostly fixed, which requires frequent tripping and drilling, greatly increasing drilling costs and reducing drilling efficiency, this utility model proposes a variable diameter stabilizer.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A variable path stabilizer, comprising:

[0008] The housing has a mounting groove on its side wall that communicates with it, and a push block is slidably embedded in the mounting groove;

[0009] A central tube, which is slidably embedded within the housing;

[0010] A drive assembly, which is disposed inside the housing, is used to drive the central tube to move axially along the housing;

[0011] The protrusion and the recess are provided, the protrusion is provided at the end of the push block facing the central tube, and the recess is provided on the side wall of the central tube, the shape of the protrusion and the shape of the recess are adapted to each other.

[0012] In this technical solution, the stabilizer (shell) straightening section is 300mm long; the outer diameter of both ends of the stabilizer is 178mm; the total length of the stabilizer is 1500mm; the diameter of the stabilizer water eye is 55mm. The downhole environment is relatively complex. When the electrically driven variable diameter stabilizer is working, its surface will be eroded by the annular drilling fluid. Because the drilling fluid will carry drill cuttings after cleaning the bottom of the well, the drill cuttings will cause serious wear on the surface of the stabilizer. Therefore, the selection of the surface material of the stabilizer needs to consider its wear resistance. Thus, the shell material of the variable diameter stabilizer should be a high-strength material, such as 35CrMo, 42CrMo, 40CrNiMo, etc. At the same time, the surface of the shell material needs to be strengthened. Additionally, it should be noted that in this design, the mounting groove is U-shaped and located on one side of the central tube. There are multiple mounting grooves, and the number of push blocks corresponds to the number of mounting grooves. When a diameter change is required, such as when it is necessary to increase the distance the push block extends beyond the mounting groove: initially, the protrusion is located inside the recess, and the distance the push block extends beyond the mounting groove is the smallest (i.e., the diameter of the stabilizer is the smallest). Then, the central tube is driven to move downward along the axial direction of the housing by the drive device. At this time, the protrusion and the recess gradually become misaligned, and the distance the push block extends beyond the mounting groove gradually increases. When the protrusion on the push block contacts the side wall of the central tube, the push block is in a fully extended state, and at this time, the diameter of the stabilizer is the largest.

[0013] Preferably, the protrusion includes an arcuate surface at its end, the arcuate surface being inclined from top to bottom in a direction close to the central tube.

[0014] In this technical solution, it should be noted that the shape of the recessed part is the same as that of the protruding part, that is, the recessed part also has an inclined surface. This setting allows the protruding part and the recessed part to cooperate when the central tube moves, and the distance that drives the push block to extend out of the mounting groove will gradually increase or decrease, thereby increasing the adjustment range of the distance that the push block extends out of the mounting groove.

[0015] Preferably, the protrusion further includes a limiting surface located at its bottom, the limiting surface being perpendicular to the central tube.

[0016] In this technical solution, it should be noted that the recessed part also has a limiting surface. The limiting surface is used to position the central tube. That is, when the push block is to be retracted, the central tube is moved upward. When the limiting surface of the protrusion comes into contact with the limiting surface of the recessed part, it indicates that the push block has been retracted.

[0017] Preferably, a sealing ring is provided between the push block and the mounting groove.

[0018] In this technical solution, it should be noted that the sealing ring is a C-shaped slip ring combination seal, which is used to ensure the sealing of the mounting groove.

[0019] Preferably, the push block is elastically connected to the mounting groove via a spring.

[0020] In this technical solution, it should be noted that one end of the spring is fixed to the mounting groove, and the other end is fixed by the positioning step of the push block. The purpose of the spring is to ensure that the push block is always in contact with the central tube during installation and drilling.

[0021] Preferably, the drive assembly includes a motor and a lead screw nut, the motor is fixed inside the housing, the lead screw nut is screwed onto the output shaft of the motor, and the central tube is fixedly connected to the lead screw nut.

[0022] In this technical solution, it should be noted that the lead screw and nut mechanism has self-locking properties. When the motor stops rotating, the self-locking property of the lead screw and nut mechanism positions the central tube. To prevent the lead screw and nut from rotating with the motor's output shaft, a guide rail can be installed on the central tube, and a guide groove that mates with the guide rail can be installed on the housing to limit the circumferential movement of the central tube. The ground operator controls the motor through control signals. When the motor rotates, due to the motion characteristics of the lead screw and nut mechanism, the lead screw and nut move linearly relative to the motor's output shaft. When the motor rotates forward, the axial movement of the lead screw and nut drives the central tube downward. Because the contact surface between the push block and the central tube is arc-shaped, the push block extends as the central tube moves downward. The diameter change ends when the central tube contacts the protrusion on the body and the push block is fully extended. At this time, the motor idles, and the ground operator detects a decrease in motor current and stops the motor. When the motor reverses, the central tube moves upward with the axial movement of the lead screw nut and returns to the set position. The push block is pushed back by the pressure of the drilling fluid, and the electric drive variable diameter stabilizer returns to the small diameter state.

[0023] Preferably, the central tube is detachably connected to the lead screw nut via bolts.

[0024] Preferably, the housing further includes a pin positioning sleeve, on which a pin assembly is mounted, the pin assembly including a cable connected to the motor. The housing also includes a socket positioning sleeve, on which a socket is mounted, and the cable passes through the central tube and connects to the socket. The cable is wrapped with a protective sleeve.

[0025] In this technical solution, it should be noted that the cable used is a mineral-insulated cable, which features high operating temperature and small outer diameter. The selected cable is a mineral-insulated cable BTTZ3×16 manufactured by Huarui Company, with a rated voltage of 1.8 / 3KV, a transmission power of 180kW, and an outer diameter of φ15.6mm. The pin positioning sleeve is fixed to the housing with screws, and the motor is fixed to the housing with the motor board. Sealing rubber rings are provided between the central tube, the motor board, and the motor and the housing to ensure a seal. The pin assembly and cable are used to supply power to the motor and the socket.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0027] 1. In this utility model, the diameter of the stabilizer can be changed by moving the central tube and, according to the cooperation of the protrusion and the recess, realizing the extension and retraction of the push block, thereby realizing the diameter change;

[0028] 2. In this utility model, by setting the arc surface, when the central tube moves, the protrusion and the recess cooperate, and the distance that the push block extends out of the mounting groove will gradually increase or gradually decrease, thereby making the adjustment range of the distance that the push block extends out of the mounting groove larger.

[0029] 3. In this utility model, the center tube is positioned by the setting of the limiting surface. That is, when the push block is to be retracted, the center tube is moved upward. When the limiting surface of the protrusion contacts the limiting surface of the recess, it indicates that the push block has been retracted.

[0030] 4. In this utility model, a motor and a lead screw and nut are used as driving devices. The lead screw and nut mechanism has self-locking properties. When the motor stops rotating, the center tube is positioned due to the self-locking properties of the lead screw and nut mechanism. Attached Figure Description

[0031] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a cross-sectional view of the shell structure in this utility model;

[0033] Figure 2 for Figure 1 A diagram showing the result after cutting;

[0034] Figure 3 This is a schematic diagram of the push block structure.

[0035] Reference numerals: 1-Housing, 2-Central tube, 3-Mounting groove, 4-Push block, 5-Protrusion, 6-Recess, 7-Arc-shaped surface, 8-Limiting surface, 9-Sealing ring, 10-Spring, 11-Motor, 12-Output shaft, 13-Lead screw nut, 14-Pin positioning sleeve, 15-Pin assembly, 16-Cable, 17-Protective sleeve, 18-Socket positioning sleeve, 19-Socket. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] Example 1

[0038] like Figures 1-3 As shown, this embodiment provides a variable path stabilizer, including:

[0039] The housing 1 has a mounting groove 3 communicating with it on its side wall, and a push block 4 is slidably embedded in the mounting groove 3;

[0040] Central tube 2, which is slidably embedded in the housing 1;

[0041] A drive assembly, which is disposed inside the housing 1, is used to drive the central tube 2 to move along the axial direction of the housing 1;

[0042] The protrusion 5 and the recess 6 are provided. The protrusion 5 is provided at the end of the push block 4 facing the central tube 2, and the recess 6 is provided on the side wall of the central tube 2. The shape of the protrusion 5 is adapted to the shape of the recess 6.

[0043] In this embodiment, it should be noted that the length of the stabilizer (shell 1) straightening section is 300mm; the outer diameter of both ends of the stabilizer is 178mm; the total length of the stabilizer is 1500mm; the diameter of the stabilizer water eye is 55mm; the downhole environment is relatively complex. When the electrically driven variable diameter stabilizer is working, its surface will be scoured by the annular drilling fluid. Because the drilling fluid will carry drill cuttings after cleaning the bottom of the well, the drill cuttings will cause serious wear on the surface of the stabilizer. Therefore, the selection of the surface material of the stabilizer needs to consider its wear resistance. Therefore, the material of the variable diameter stabilizer shell 1 should be a high-strength material, such as 35CrMo, 42CrMo, 40CrNiMo, etc. At the same time, the surface of the shell 1 material needs to be strengthened. Additionally, it should be noted that in this design, the mounting groove 3 is U-shaped and located on one side of the central tube 2. There are multiple mounting grooves 3, and the number of push blocks 4 corresponds to the number of mounting grooves 3. When a change in diameter is required, for example, when it is necessary to increase the distance that the push blocks 4 extend out of the mounting groove 3: In the initial state, the protrusion 5 is located inside the recess 6, and at this time, the distance that the push blocks 4 extend out of the mounting groove 3 is the smallest (i.e., the diameter of the stabilizer is the smallest). Then, the central tube 2 is driven to move downward along the axial direction of the housing 1 by the driving device. At this time, the protrusion 5 and the recess 6 gradually become misaligned, and the distance that the push blocks 4 extend out of the mounting groove 3 gradually increases. When the protrusion 5 on the push blocks 4 contacts the side wall of the central tube 2, the push blocks 4 are in a fully extended state. At this time, the diameter of the stabilizer is the largest.

[0044] like Figure 3 As shown, in this embodiment, the protrusion 5 includes an arc-shaped surface 7 at its end, which is inclined from top to bottom along the direction close to the central tube 2. It should be noted that the shape of the recess 6 is the same as that of the protrusion 5, that is, the recess 6 also has an inclined surface. This arrangement allows the protrusion 5 and the recess 6 to cooperate when the central tube 2 moves, causing the distance by which the push block 4 extends out of the mounting groove 3 to gradually increase or decrease, thereby increasing the adjustment range of the distance by which the push block 4 extends out of the mounting groove 3.

[0045] like Figure 3 As shown, in this embodiment, the protrusion 5 also includes a limiting surface 8 located at its bottom, which is perpendicular to the central tube 2. It should be noted that the recess 6 also has a limiting surface 8. The limiting surface 8 is used to position the central tube 2; that is, when the push block 4 is to be retracted, the central tube 2 is moved upwards. When the limiting surface 8 of the protrusion 5 contacts the limiting surface 8 of the recess 6, it indicates that the push block 4 has been retracted.

[0046] like Figure 2 As shown, in this embodiment, a sealing ring 9 is provided between the push block 4 and the mounting groove 3. It should be noted that the sealing ring 9 is a C-shaped slip ring combination seal, used to ensure the sealing performance of the mounting groove 3.

[0047] like Figure 2 As shown, in this embodiment, the push block 4 is elastically connected to the mounting groove 3 via a spring 10.

[0048] It should be noted that one end of the spring 10 is fixed to the mounting groove 3, and the other end is fixed by the positioning step of the push block 4. The purpose of the spring 10 is to ensure that the push block 4 is always in contact with the central tube 2 during installation and drilling.

[0049] Example 2

[0050] like Figure 1 As shown, this embodiment is largely the same as the above embodiment, except that the drive assembly includes a motor 11 and a lead screw nut 13. The motor 11 is fixed inside the housing 1, and the lead screw nut 13 is screwed onto the output shaft 12 of the motor 11. The central tube 2 is fixedly connected to the lead screw nut 13. It should be noted that the lead screw nut mechanism has self-locking properties. When the motor 11 stops rotating, the central tube 2 is positioned due to the self-locking property of the lead screw nut mechanism. To prevent the lead screw nut 13 from rotating with the output shaft 12 of the motor 11, a guide rail can be provided on the central tube 2, and a guide groove that cooperates with the guide rail can be provided on the housing 1 to limit the circumferential movement of the central tube 2. The ground operator controls the motor 11 by controlling an electrical signal. When the motor 11 rotates, due to the motion characteristics of the lead screw nut mechanism, the lead screw nut moves linearly relative to the output shaft 12 of the motor 11. When the motor 11 rotates forward, the axial movement of the lead screw nut drives the central tube 2 to move downward. Because the contact surface between the push block 4 and the central tube 2 is an arc-shaped surface 7, the push block 4 extends as the central tube 2 moves downward. The diameter change ends when the central tube 2 contacts the protrusion 5 on the main body and the push block 4 is fully extended. At this time, the motor 11 idles, and the ground operator detects a decrease in the motor 11 current and stops the motor 11. When the motor 11 reverses, the central tube 2 moves upward with the axial movement of the lead screw nut 13, returning to the set position. The push block 4 is pushed back by the drilling fluid pressure, and the electrically driven variable diameter stabilizer returns to the small diameter state.

[0051] like Figure 1 As shown, in this embodiment, the central tube 2 is detachably connected to the lead screw nut 13 by bolts.

[0052] Example 3

[0053] like Figure 1As shown, this embodiment is largely the same as the above embodiment, except that the housing 1 also includes a pin positioning sleeve 14, on which a pin assembly 15 is provided. The pin assembly 15 includes a cable 16, which is connected to the motor 11. The housing 1 also includes a socket positioning sleeve 18, on which a socket 19 is provided. The cable 16 passes through the central tube 2 and connects to the socket 19. The cable 16 is wrapped with a protective sleeve 17. It should be noted that the cable is a mineral-insulated cable, which has the characteristics of high operating temperature and small outer diameter. The selected cable is a mineral-insulated cable BTTZ3×16 produced by Huarui Company, with a rated voltage of 1.8 / 3KV, a transmission power of 180kW, and an outer diameter of φ15.6mm. The pin positioning sleeve 14 is fixed inside the housing 1 by screws, and the motor 11 is fixed inside the housing 1 by the motor 11 plate. The center tube 2, the motor 11 plate, the motor 11 and the housing 1 are all provided with sealing rubber rings to ensure sealing. The pin assembly 15 and the cable 16 are used to supply power to the motor 11 and the socket 19.

[0054] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0055] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0056] It should be noted that the controller and its automatic control program involved in this utility model can be implemented by those skilled in the art based on the principles of similar control programs in the prior art, and are not the inventive aspect of this utility model. Furthermore, the electronic components and corresponding electronic circuits involved in this application are all prior art, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this utility model does not involve improvements to software, algorithms, or methods.

[0057] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A variable-path stabilizer, characterized in that, include: The housing (1) has a mounting groove (3) communicating with it on its side wall, and a push block (4) is slidably embedded in the mounting groove (3); a central tube (2) is slidably embedded in the housing (1); a driving assembly is located in the housing (1) and is used to drive the central tube (2) to move along the axial direction of the housing (1); a protrusion (5) and a recess (6) are provided, the protrusion (5) is located at one end of the push block (4) facing the central tube (2), and the recess (6) is located on the side wall of the central tube (2). The shape of the protrusion (5) is adapted to the shape of the recess (6). A sealing ring (9) is provided between the push block (4) and the mounting groove (3). The sealing ring is a C-shaped slip ring combination seal to ensure the sealing of the mounting groove; the push block (4) is elastically connected to the mounting groove (3) by a spring (10).

2. A variable-diameter stabilizer according to claim 1, characterized in that, The protrusion (5) includes an arcuate surface (7) at its end, which is inclined from top to bottom in a direction close to the central tube (2).

3. A variable-diameter stabilizer according to claim 2, characterized in that, The protrusion (5) also includes a limiting surface (8) located at its bottom, which is perpendicular to the central tube (2).

4. A variable-diameter stabilizer according to claim 1, characterized in that, The drive assembly includes a motor (11) and a lead screw nut (13). The motor (11) is fixed inside the housing (1), and the lead screw nut (13) is screwed onto the output shaft (12) of the motor (11). The central tube (2) is fixedly connected to the lead screw nut (13).

5. A variable-diameter stabilizer according to claim 4, characterized in that, The central tube (2) is detachably connected to the lead screw nut (13) by bolts.

6. A variable-path stabilizer according to claim 4, characterized in that, The housing (1) is also provided with a pin positioning sleeve (14), and the pin positioning sleeve (14) is provided with a pin assembly (15), the pin assembly (15) including a cable (16), the cable (16) being connected to the motor (11).

7. A variable-path stabilizer according to claim 6, characterized in that, The housing (1) is also provided with a socket positioning sleeve (18), and a socket (19) is provided on the socket positioning sleeve (18). The cable (16) passes through the central tube (2) and is connected to the socket (19).

8. A variable-diameter stabilizer according to claim 6, characterized in that, The cable (16) is covered with a protective sleeve (17).

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