Integrated whipstock locking structure and coiled tubing windowing device

Abstract

The utility model relates to the technical field of integrated whipstock, and provides an integrated whipstock locking structure and a coiled tubing windowing device, the locking structure is arranged in a screw drill, the screw drill is provided with a cardan shaft assembly and a transmission shaft assembly, the locking structure is arranged between the cardan shaft assembly and the transmission shaft assembly, and the locking structure is arranged on the cardan shaft assembly. The milling cone is arranged at the output end of the transmission shaft assembly, the whipstock is arranged on the milling cone, the locking structure comprises a shell, a protruding block and a locking body, the shell is hollow, one end of the shell is arranged on the universal shaft assembly, and the other end of the shell is arranged on the transmission shaft assembly. The protruding block is arranged on the universal shaft assembly and extends into the shell. The locking body is movably arranged in the shell and provided with a groove, and the protruding block extends into the groove after rotating. By means of the technical scheme, the problems that in the prior art, an existing connection mode of a whipstock and a milling cone is not stable, a shearing screw is prone to being broken in advance, and installation of the whipstock is affected are solved.

Description

Technical Field

[0001] This utility model relates to the field of integrated guide vanes, specifically to an integrated guide vane locking structure and a continuous tubing window opening device. Background Technology

[0002] Traditional sidetracking tools consist of a guide vane and a milling cone, which are separate tools. During operation, the guide vane is first connected to the feeder and then driven to the predetermined position in the well using the drill string. After adjusting the azimuth, it is hydraulically or mechanically set and secured. The feeder is then separated from the guide vane, and both the drill string and feeder are retrieved. The milling cone is then used to open the window. Due to the depth of sidetracking wells, each trip involves long operation time, high costs, and high labor intensity for workers.

[0003] To overcome the problems of traditional window-opening sidetracking tools and improve work efficiency, an integrated window-opening device has emerged, combining the guide vane and the milling cone. During operation, after the drill string is lowered to the predetermined position, the milling cone cuts the rock under the guidance of the guide vane, with drilling fluid assisting the operation. This device has significant advantages, shortening operation time, reducing costs, alleviating labor intensity, and improving operational accuracy. It has achieved remarkable results in applications in Shengli Oilfield and other locations.

[0004] However, the aforementioned integrated window opening device still requires continuous filling of drill strings, which is a cumbersome process. Furthermore, the guide screw and the milling cone are mostly connected and fixed by shear screws. This connection method is not stable and is prone to premature breakage of the shear screws, affecting the installation of the guide screw. Therefore, the existing integrated window opening device needs to be improved to solve the above problems. Utility Model Content

[0005] This utility model proposes an integrated guide lock structure and a continuous tubing window opening device, which solves the problem that the existing connection between the guide and the milling cone in related technologies is not stable and is prone to premature breakage of the shear screw, affecting the installation of the guide.

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

[0007] An integrated guide vane locking structure is disposed within a screw drill bit, the screw drill bit having a universal joint assembly and a drive shaft assembly, the locking structure being disposed between the universal joint assembly and the drive shaft assembly, a milling cone being disposed at the output end of the drive shaft assembly, and a guide vane being disposed on the milling cone, the locking structure comprising:

[0008] The outer shell is hollow inside, with one end of the outer shell mounted on the universal joint assembly and the other end mounted on the drive shaft assembly;

[0009] A protrusion is provided on the universal joint assembly and extends into the interior of the housing;

[0010] The locking body is movably disposed inside the housing, and the locking body has a groove, into which the protrusion extends after rotation.

[0011] As a further technical solution, it also includes:

[0012] An elastic element is provided, with one end acting on the drive shaft assembly and the other end acting on the locking body, for providing a force to the locking body to approach the protrusion.

[0013] As a further technical solution, it also includes:

[0014] The limiting member has a receiving groove on the protrusion, and the limiting member is movably disposed in the receiving groove. The moving direction of the limiting member is perpendicular to the moving direction of the locking body. The groove has a limiting groove. After the protrusion rotates, it extends into the groove, and the limiting member is stuck in the limiting groove.

[0015] As a further technical solution, it also includes:

[0016] The second elastic element has one end acting on the bottom of the receiving groove and the other end acting on the limiting element.

[0017] As a further technical solution, the groove includes:

[0018] The entrance section is trapezoidal in shape and gradually narrows from the outside to the inside.

[0019] A limiting segment is connected to the narrow end of the inlet segment. The contour of the limiting segment is the same as the contour of the limiting member. The limiting groove is located on the limiting segment.

[0020] As a further technical solution, there are multiple limiting members corresponding to the grooves.

[0021] As a further technical solution, the limiting member is spherical and the limiting groove is hemispherical.

[0022] As a further technical solution, the outer shell has a drilling fluid channel one, and the locking body has a drilling fluid channel two and a drilling fluid channel three connected to each other. The drilling fluid channel three is connected to the drive shaft assembly. After the locking body moves, the drilling fluid channel one is connected to the drilling fluid channel two.

[0023] As a further technical solution, a coiled tubing window opening device is also proposed, including the aforementioned integrated guide lock structure, and further including a coiled tubing, a circulation joint, and a seat seal joint connected in sequence, with the screw drill bit mounted on the seat seal joint.

[0024] The working principle and beneficial effects of this utility model are as follows:

[0025] In this invention, during the window-opening process, the milling cone, connected to the screw drill bit, is driven to rotate. To reduce steps, an integrated guide vane is used, where the guide vane is connected to the milling cone via a shear screw and lowered together. Once the guide vane reaches the designated position, it is hydraulically driven to fix itself to the wellbore. Subsequently, the screw drill bit drives the milling cone to rotate, cutting off the shear screw. Then, the milling cone performs the window-opening action along the inclined surface of the guide vane. The screw drill bit consists of a bypass valve assembly, a motor assembly, a universal joint assembly, and a drive shaft assembly. Drilling fluid converts hydraulic energy into mechanical energy through the motor assembly, and then drives the milling cone to rotate through the universal joint assembly and drive shaft assembly. Because it is an integrated guide vane, the milling cone and guide vane cannot have any relative displacement during tripping in and out of the well. However, since drilling fluid still enters the motor assembly during tripping in and out of the well, and the shear screw is easily cut off, the shear screw may accidentally cut off prematurely, causing the guide vane to fail to reach the designated position. This requires the guide vane to be retrieved and reinstalled, which is time-consuming, labor-intensive, and increases costs.

[0026] To address the issue of an unstable connection between the guide vane and the milling cone, which could lead to premature breakage of the shear screw and affect guide vane installation, a locking structure was added between the universal joint assembly and the drive shaft assembly of the screw drill bit. This locking structure prevents drilling fluid from entering the motor assembly during tripping or other unexpected events that could cause the motor assembly to start prematurely, thus preventing the milling cone from rotating prematurely and cutting off the shear screw. This ensures that the milling cone will not rotate prematurely when the guide vane is lowered, reducing the accident rate and improving window opening efficiency. Attached Figure Description

[0027] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0028] Figure 1 This is a schematic diagram of the window opening device in this utility model;

[0029] Figure 2 This is a schematic diagram of the screw drill structure in this utility model;

[0030] Figure 3 This is a cross-sectional view of the locking structure in this utility model;

[0031] Figure 4 This is a three-dimensional structural diagram of the locking structure in this utility model;

[0032] Figure 5 This is a schematic diagram of the internal structure of the locking structure in this utility model;

[0033] Figure 6 This is a schematic diagram of the locking main structure in this utility model;

[0034] Figure 7 This is a schematic diagram of the internal structure of the protrusion in this utility model;

[0035] In the diagram: 1. Screw drill bit, 2. Universal joint assembly, 3. Drive shaft assembly, 4. Milling tap, 5. Guide directional device, 6. Housing, 7. Protrusion, 8. Locking body, 9. Groove, 10. Elastic element one, 11. Limiting element, 12. Receiving groove, 13. Limiting groove, 14. Elastic element two, 15. Inlet section, 16. Limiting section, 17. Drilling fluid channel one, 18. Drilling fluid channel two, 19. Drilling fluid channel three, 20. Coiled tubing, 21. Circulation joint, 22. Sealing joint. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0037] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between 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.

[0039] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] like Figures 1-7As shown, an integrated guide 5 locking structure is proposed, which is installed inside the screw drill 1. The screw drill 1 has a universal joint assembly 2 and a drive shaft assembly 3. The locking structure is located between the universal joint assembly 2 and the drive shaft assembly 3. The milling cone 4 is located at the output end of the drive shaft assembly 3. The guide 55 is located on the milling cone 4. The locking structure includes: a hollow housing 6, one end of which is located on the universal joint assembly 2 and the other end of which is located on the drive shaft assembly 3; a protrusion 7 is located on the universal joint assembly 2 and extends into the housing 6; and a locking body 8 is movably located inside the housing 6. The locking body 8 has a groove 9, and the protrusion 7 extends into the groove 9 after rotation.

[0041] During the window opening process, the milling cone 4, connected to the screw drill bit, is driven to rotate. To reduce the number of steps, an integrated guide vane 5 is used. The guide vane 5 is connected to the milling cone 4 via a shear screw and lowered together. After the guide vane 5 reaches the designated position, it is hydraulically driven to fix itself to the well wall. Then, the screw drill bit drives the milling cone 4 to rotate, cutting off the shear screw. The milling cone 4 then performs the window opening action along the inclined surface of the guide vane 5. The screw drill bit consists of a bypass valve assembly, a motor assembly, a universal joint assembly 2, and a drive shaft assembly 3. The drilling fluid converts hydraulic energy into mechanical energy through the motor assembly, and then drives the milling cone 4 to rotate through the universal joint assembly 2 and the drive shaft assembly 3. Because the guide vane 5 is an integrated unit, the milling cone 4 and the guide vane 5 cannot have any relative displacement during tripping in and out of the drill string. However, since drilling fluid still enters the motor assembly during tripping in and out of the drill string, and the shear screw is easily cut off, the shear screw may accidentally cut off prematurely, causing the guide vane 5 to fail to reach the designated position. This requires the guide vane 5 to be retrieved and reinstalled, which is time-consuming, labor-intensive, and increases costs.

[0042] In this embodiment, to address the problem that the connection between the guide directional device 5 and the milling cone 4 is not stable and the shearing screw is prone to breakage prematurely, affecting the installation of the guide directional device 5, a locking structure is added between the universal joint assembly 2 and the drive shaft assembly 3 of the screw drill bit. The locking structure can prevent drilling fluid from entering the motor assembly during tripping or other unexpected situations that could cause the motor assembly to start, thereby causing the milling cone 4 to rotate prematurely and cut off the shearing screw. This ensures that the milling cone 4 will not rotate prematurely when the guide directional device 5 is lowered, reducing the accident rate and improving the window opening efficiency.

[0043] Specifically, the locking structure mainly consists of a housing 6, a locking body 8, and a protrusion 7. The protrusion 7 is fixed on the universal joint assembly 2, and its end abuts against the end face of the locking body 8. The locking body 8 has a groove 9 for the protrusion 7 to enter, but it is not aligned. The protrusion 7 needs to be rotated a certain angle before it can enter. That is to say, when the motor assembly starts, the milling cone 4 will not rotate immediately because the locking structure disconnects the transmission between the universal joint assembly 2 and the drive shaft assembly 3. After the protrusion 7 rotates a certain angle with the universal joint, the protrusion 7 will be aligned with the groove 9. The locking body 8 will move toward the protrusion 7 and completely insert the protrusion 7 into the groove 9. Then the locking body 8 will rotate with the universal joint, thereby driving the drive shaft to rotate, and the milling cone 4 will also rotate.

[0044] In addition, a certain gap can be reserved between the drive shaft and its own housing. When the locking body 8 moves toward the protrusion 7, the drive shaft also moves accordingly. The reserved gap will not interfere with the movement of the drive shaft.

[0045] Furthermore, it also includes: one end of the elastic element 10 acts on the drive shaft assembly 3, and the other end acts on the locking body 8, for providing a force for the locking body 8 to approach the protrusion 7.

[0046] In this embodiment, the elastic element 10 can be a spring. On the one hand, when the protrusion 7 and the groove 9 are aligned, the locking body 8 can automatically move towards the protrusion 7 and insert the protrusion 7 into the groove 9. On the other hand, it can ensure that the locking body 8 always maintains a close fit with the protrusion 7. Even if the drill is subjected to external forces such as vibration and impact during operation, it can ensure that the connection between the protrusion 7 and the groove 9 is stable and ensure the stability of power transmission.

[0047] Furthermore, it also includes: the protrusion 7 has a receiving groove 12, the limiting member 11 is movably disposed in the receiving groove 12, the moving direction of the limiting member 11 is perpendicular to the moving direction of the locking body 8, the groove 9 has a limiting groove 13, the protrusion 7 rotates and extends into the groove 9, and the limiting member 11 is stuck in the limiting groove 13.

[0048] In this embodiment, a receiving groove 12 is machined on the protrusion 7, and the limiting member 11 is placed in the receiving groove 12 so that it can move within the receiving groove 12, and the direction of movement is perpendicular to the direction of movement of the locking body 8. A limiting groove 13 is machined on the groove 9 of the locking body 8. When the protrusion 7 rotates and extends into the groove 9, the limiting member 11 can be locked in the limiting groove 13.

[0049] The cooperation between the limiting member 11 and the limiting groove 13 provides additional limiting protection for the connection between the protrusion 7 and the groove 9, further preventing the protrusion 7 from coming out of the groove 9, enhancing the stability and reliability of the locking structure, and enabling the locking structure of the guide 5 to work reliably even in complex working environments.

[0050] Furthermore, it also includes: one end of the elastic element 14 acts on the bottom of the receiving groove 12, and the other end acts on the limiting element 11.

[0051] In this embodiment, an elastic element 2 14, such as a small spring, is installed between the bottom of the receiving groove 12 and the limiting member 11. One end of the elastic element 2 14 is fixed to the bottom of the receiving groove 12, and the other end is connected to the limiting member 11. During the rotation of the protrusion 7, the elastic element 2 14 always provides an outward force to the limiting member 11, so that the limiting member 11 can quickly engage with the limiting groove 13 after the protrusion 7 extends into the groove 9.

[0052] The function of the elastic element 14 is to ensure that the limiting element 11 can be locked into the limiting groove 13 in a timely and reliable manner, thereby further enhancing the automatic locking function of the locking structure.

[0053] Furthermore, the groove 9 includes: an inlet section 15 in the shape of a trapezoid, which gradually narrows from the outside to the inside; a limiting section 16 connected to the narrow end of the inlet section 15, the contour of the limiting section 16 being the same as the contour of the limiting member 11; and a limiting groove 13 located on the limiting section 16.

[0054] In this embodiment, when the protrusion 7 rotates and approaches the groove 9, the trapezoidal shape of the inlet section 15 facilitates the smooth entry of the protrusion 7 into the groove 9. Subsequently, the limiting member 11 on the protrusion 7 aligns with the limiting groove 13 on the limiting section 16 and engages.

[0055] The design of the groove 9 makes it easier for the protrusion 7 to enter the groove 9, improving the assembly efficiency and accuracy of the locking structure. At the same time, the precise matching contour of the limiting segment 16 and the limiting member 11, as well as the setting of the limiting groove 13, further ensure the stability of the limiting member 11 after it is engaged, enhancing the reliability and overall performance of the locking structure.

[0056] Furthermore, there are multiple limiting members 11 corresponding to the grooves 9.

[0057] In this embodiment, the arrangement of multiple limiting members 11 and grooves 9 can more evenly distribute the force borne by the locking structure, further improve the load-bearing capacity and stability of the locking structure, and ensure that the locking structure of the guide 5 can still work normally when subjected to large torque or external force, and is not prone to local damage or failure.

[0058] Furthermore, the limiting member 11 is spherical, and the limiting groove 13 is hemispherical.

[0059] In this embodiment, the limiting member 11 is machined into a spherical shape, and a hemispherical limiting groove 13 is machined on the limiting section 16 of the groove 9. When the protrusion 7 rotates and extends into the groove 9, the spherical limiting member 11 is engaged in the hemispherical limiting groove 13 under the action of the elastic member 14.

[0060] The spherical limiting member 11 and the hemispherical limiting groove 13 cooperate to have better self-centering and adaptability. They can compensate for position deviations caused by machining errors or minor deformations during operation to a certain extent, ensuring that the limiting member 11 can be reliably locked into the limiting groove 13. This improves the stability and reliability of the locking structure and also facilitates installation and adjustment.

[0061] Furthermore, the outer casing 6 has a drilling fluid channel 17, and the locking body 8 has a connected drilling fluid channel 2 18 and a drilling fluid channel 3 19. The drilling fluid channel 3 19 is connected to the drive shaft assembly 3. After the locking body 8 moves, the drilling fluid channel 17 and the drilling fluid channel 2 18 are connected.

[0062] In this embodiment, when the locking body 8 moves to a suitable position within the housing 6, the drilling fluid channel 17 and the drilling fluid channel 2 18 are connected. For example, during drilling operations, the drilling fluid enters from the drilling fluid channel 17 of the housing 6, flows through the drilling fluid channel 2 18 and the drilling fluid channel 3 19 of the locking body 8, and finally flows to the drive shaft assembly 3 and the milling cone 4. It is then ejected from the preset channel within the milling cone 4, cleaning the bottom of the well, carrying away rock cuttings, and returning to the surface through the annulus. It also provides necessary cooling and lubrication for the drilling tools.

[0063] Furthermore, a coiled tubing window opening device is proposed, including an integrated guide 5 locking structure, and a coiled tubing 20, a circulation joint 21 and a seat joint 22 connected in sequence, with the screw drill 1 mounted on the seat joint 22.

[0064] In this embodiment, the use of coiled tubing avoids the process of continuously loading drill pipes or drill strings, greatly improving work efficiency and saving manpower and resources.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An integrated guide lock structure, disposed within a screw drill (1), the screw drill (1) having a universal joint assembly (2) and a drive shaft assembly (3), the lock structure being disposed between the universal joint assembly (2) and the drive shaft assembly (3), a milling cone (4) being disposed at the output end of the drive shaft assembly (3), and a guide (5) being disposed on the milling cone (4), characterized in that, The locking structure includes: The outer shell (6) is hollow inside. One end of the outer shell (6) is disposed on the universal joint assembly (2), and the other end is disposed on the drive shaft assembly (3). A protrusion (7) is provided on the universal joint assembly (2) and extends into the interior of the housing (6); The locking body (8) is movably disposed inside the outer shell (6). The locking body (8) has a groove (9), and the protrusion (7) extends into the groove (9) after rotation.

2. The integrated guide lock structure according to claim 1, characterized in that, Also includes: Elastic element one (10), one end of which acts on the drive shaft assembly (3) and the other end of which acts on the locking body (8), is used to provide the locking body (8) with a force close to the protrusion (7).

3. The integrated guide lock structure according to claim 1, characterized in that, Also includes: The limiting member (11) has a receiving groove (12) on the protrusion (7). The limiting member (11) is movably disposed in the receiving groove (12). The moving direction of the limiting member (11) is perpendicular to the moving direction of the locking body (8). The groove (9) has a limiting groove (13). After the protrusion (7) rotates, it extends into the groove (9). The limiting member (11) is stuck in the limiting groove (13).

4. The integrated guide lock structure according to claim 3, characterized in that, Also includes: The second elastic element (14) has one end acting on the bottom of the receiving groove (12) and the other end acting on the limiting element (11).

5. The integrated guide lock structure according to claim 3, characterized in that, The groove (9) includes: The entrance section (15) is trapezoidal in shape and gradually narrows from the outside to the inside; The limiting segment (16) is connected to the narrow end of the inlet segment (15). The contour of the limiting segment (16) is the same as that of the limiting member (11). The limiting groove (13) is located on the limiting segment (16).

6. The integrated guide lock structure according to claim 3, characterized in that, There are multiple limiting members (11) corresponding to the grooves (9).

7. The integrated guide lock structure according to claim 3, characterized in that, The limiting member (11) is spherical, and the limiting groove (13) is hemispherical.

8. The integrated guide lock structure according to claim 1, characterized in that, The outer casing (6) has a drilling fluid channel one (17), and the locking body (8) has a drilling fluid channel two (18) and a drilling fluid channel three (19) connected to each other. The drilling fluid channel three (19) is connected to the drive shaft assembly (3). After the locking body (8) moves, the drilling fluid channel one (17) is connected to the drilling fluid channel two (18).

9. A coiled tubing window opening device, comprising the integrated guide lock structure as described in claim 1, characterized in that, It also includes a continuous tubing (20), a circulation joint (21) and a seat seal joint (22) connected in sequence, with the screw drill (1) mounted on the seat seal joint (22).

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