A back-off prevention tool for oil drilling

Abstract

This utility model discloses an anti-backlash tool for oil drilling and production, belonging to the technical field of anti-backlash tools. It includes a surface casing, a production casing, and a base plate. The surface casing is connected to the production casing, and a fixing sleeve is provided on the base plate. The base plate and the fixing sleeve are located outside the surface casing. Multiple annularly arranged clamping screws are provided on the fixing sleeve to increase the connection stability with the surface casing. An adjustment structure is used to adjust the position of the clamping blocks. The clamping blocks are arranged in an annular array relative to the production casing, increasing the number of points of application to the production casing. This increases stability and ensures uniform application of force, preventing uneven force. A drive gear ring, a follower gear, a first transmission gear, and a second transmission gear drive all the adjusting screws to move, allowing all the clamping blocks to adjust synchronously and ensuring adjustment accuracy.

Description

Technical Field

[0001] This utility model relates to the field of anti-backlash tools, and in particular to an anti-backlash tool for oil well drilling. Background Technology

[0002] A drilling anti-backlash tool is a tool specifically designed for drilling operations to prevent relative rotation between the production casing and the surface casing, thus preventing backlash. Anti-backlash tools are essential in oil drilling and extraction to ensure the smooth progress of the drilling process. Their working principle involves mechanically locking the surface casing and production casing together, preventing the production casing from loosening and falling off.

[0003] Existing patent CN214660003U discloses an "Anti-backlash Tool for Oil Drilling and Production." This patent describes an anti-backlash tool composed of a support plate, a first fixing mechanism, and a second fixing mechanism to clamp and fix the outer and inner tubes internally. Both the first and second fixing mechanisms can fix the inner tube and limit the movement of the outer tube, ensuring that the outer and inner tubes do not slide relative to each other during operation, thus improving the stability of the device. However, in the aforementioned patent, the second fixing mechanism has a limited number of threaded rods, resulting in fewer connection points with the tube sleeve and poor connection stability. Furthermore, although the first fixing mechanism has two limiting sliders, their effect on the inner tube is symmetrical and unevenly distributed circumferentially. Additionally, the limiting sliders are fixed using fastening screws, resulting in poor fixing effectiveness and only moderate anti-backlash effect on the inner tube. Utility Model Content

[0004] The main purpose of this utility model is to provide an anti-backlash tool for oil drilling and production, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An anti-backlash tool for oil drilling includes a surface casing, a production casing, and a base plate. The surface casing is connected to the production casing. A fixing sleeve is provided on the base plate, and the base plate and the fixing sleeve are located outside the surface casing. A support sleeve is provided on the fixing sleeve, and an adjustment structure is provided on the fixing sleeve and the support sleeve. A clamping block is connected to the adjustment structure.

[0007] Preferably, the base plate has mounting holes, and the fixing sleeve has clamping screws, which are arranged in a ring array on the fixing sleeve.

[0008] Preferably, the adjustment structure includes an annular slide rail, a sliding seat, a drive gear ring, a fixed seat, and a guide rod. The annular slide rail is fixed on the fixed sleeve, the sliding seat and the drive gear ring are fixedly connected, and the sliding seat is installed on the annular slide rail through a slide groove. The fixed seat is fixed on the support sleeve, and the guide rod is connected to the clamping block and passes through the fixed seat.

[0009] Preferably, the adjustment structure further includes a rotating shaft, a follower gear, a first transmission gear, a rotating rod, a second transmission gear, a limiting plate, and an adjusting screw. The rotating shaft is rotatably mounted on a fixed base. The follower gear and the first transmission gear are fixed on the rotating shaft, and the follower gear meshes with a drive gear ring. The rotating rod passes through the fixed base. The second transmission gear is fixed to the end of the rotating rod and meshes with the first transmission gear. The limiting plate is fixed on the rotating rod and is located on both sides of the fixed base. The adjusting screw is fixed to the end of the rotating rod and is threadedly connected to a clamping block.

[0010] Compared with the prior art, this utility model has the following beneficial effects: This anti-backlash tool for oil drilling and production has multiple annular arrayed clamping screws on the fixed sleeve, which can increase the connection stability with the surface casing. The position of the clamping blocks is adjusted by an adjustment structure. The clamping blocks are distributed in an annular array relative to the production casing, which increases the number of points of action on the production casing, which can not only increase the stability effect, but also make the action effect uniform and prevent uneven force. Through the set drive gear ring, follower gear, first transmission gear and second transmission gear, all the adjustment screws can be driven to move, so that all the clamping blocks are adjusted synchronously, ensuring the adjustment accuracy. Moreover, there is a self-locking effect between the adjustment screw and the clamping block, which can ensure the stability after adjustment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the adjustment structure of this utility model;

[0013] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle.

[0014] In the diagram: 1. Surface sleeve; 2. Production sleeve; 3. Base plate; 4. Fixed sleeve; 5. Support sleeve; 6. Clamping block; 7. Adjustment structure; 701. Circular slide rail; 702. Sliding seat; 703. Drive gear ring; 704. Fixed seat; 705. Guide rod; 706. Rotating shaft; 707. Follower gear; 708. First transmission gear; 709. Rotating rod; 710. Second transmission gear; 711. Limiting plate; 712. Adjusting screw; 8. Mounting hole; 9. Tightening screw. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] like Figures 1-3 As shown, an anti-backlash tool for oil drilling includes a surface casing 1, a production casing 2, and a base plate 3. The surface casing 1 is connected to the production casing 2. A fixing sleeve 4 is provided on the base plate 3, and the base plate 3 and the fixing sleeve 4 are located outside the surface casing 1. A support sleeve 5 is provided on the fixing sleeve 4, and an adjustment structure 7 is provided on both the fixing sleeve 4 and the support sleeve 5. A clamping block 6 is connected to the adjustment structure 7. An installation hole 8 is provided on the base plate 3, and a set-off screw 9 is provided on the fixing sleeve 4, and the set-off screw 9 is distributed in a ring array on the fixing sleeve 4. The multiple ring arrayed set-off screws 9 on the fixing sleeve 4 can increase the connection stability with the surface casing 1.

[0017] When setting up the anti-backlash tool, the base plate 3 is fixed to the appropriate position using screws and mounting holes 8. The surface casing 1 and production casing 2 run through the entire tool, and the surface casing 1 is connected to the production casing 2. Rotating the clamping screw 9 engages the surface casing 1, fixing the fixing sleeve 4 to the surface casing 1. Then, the position of the clamping block 6 is adjusted using the adjusting structure 7, so that the clamping block 6 abuts against the production casing 2, clamping and fixing the production casing 2. Under the action of the anti-backlash tool, there is a good and stable connection between the surface casing 1 and the production casing 2, preventing the production casing 2 from loosening and falling off, thus ensuring the normal progress of drilling operations.

[0018] According to the above implementation scheme, the adjustment structure 7 includes an annular slide rail 701, a sliding seat 702, a drive gear ring 703, a fixed seat 704, and a guide rod 705. The annular slide rail 701 is fixed on the fixed sleeve 4, the sliding seat 702 and the drive gear ring 703 are fixedly connected, and the sliding seat 702 is installed on the annular slide rail 701 through a sliding groove. The fixed seat 704 is fixed on the support sleeve 5, and the guide rod 705 is connected to the clamping block 6 and passes through the fixed seat 704.

[0019] The adjustment structure 7 also includes a rotating shaft 706, a follower gear 707, a first transmission gear 708, a rotating rod 709, a second transmission gear 710, a limiting plate 711, and an adjusting screw 712. The rotating shaft 706 is rotatably mounted on the fixed base 704. The follower gear 707 and the first transmission gear 708 are fixed on the rotating shaft 706, and the follower gear 707 is meshed with the drive gear ring 703. The rotating rod 709 passes through the fixed base 704. The second transmission gear 710 is fixed at the end of the rotating rod 709, and the second transmission gear 710 is meshed with the first transmission gear 708. The limiting plate 711 is fixed on the rotating rod 709, and the limiting plate 711 is located on both sides of the fixed base 704. The adjusting screw 712 is fixed at the end of the rotating rod 709, and the adjusting screw 712 is threadedly connected to the clamping block 6.

[0020] The position of the clamping blocks 6 is adjusted by the adjustment structure 7. The clamping blocks 6 are arranged in a ring array relative to the production sleeve 2, which increases the number of points of action on the production sleeve 2. This not only increases the stability effect but also makes the effect more uniform, preventing uneven force. Through the set drive gear ring 703, follower gear 707, first transmission gear 708 and second transmission gear 710, all the adjustment screws 712 can be driven to move, so that all the clamping blocks 6 are adjusted synchronously, ensuring the adjustment accuracy. Furthermore, there is a self-locking effect between the adjustment screws 712 and the clamping blocks 6, which can ensure the stability after adjustment.

[0021] When adjusting the clamping block 6, the sliding seat 702 on the annular slide rail 701 is rotated. The sliding seat 702 rotates the drive gear ring 703, thereby driving the follower gear 707 and the rotating shaft 706 to rotate. Under the action of the drive gear ring 703, all the follower gears 707 rotate synchronously, causing all the rotating shafts 706 to rotate with the first transmission gear 708. Under the action of the first transmission gear 708, the second transmission gear 710 drives the rotating rod 709 and the adjusting screw 712 to rotate. Due to the action of the limiting plate 711, the adjusting screw 712 only rotates and does not move. The clamping block 6 moves on the fixed seat 704 through the guide rod 705 in the drive box of the adjusting screw 712 until the clamping block 6 abuts against the production sleeve 2. After adjustment, the clamping block 6 generates the same force on the production sleeve 2, which can ensure the uniformity of the force and improve the stability. During disassembly, the synchronous adjustment of the relevant gears is performed by rotating the drive gear ring 703, which facilitates the disassembly work.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An anti-backlash tool for oil drilling and production, comprising a surface casing (1), a production casing (2), and a base plate (3), wherein the surface casing (1) is connected to the production casing (2), and a fixing sleeve (4) is provided on the base plate (3), and the base plate (3) and the fixing sleeve (4) are disposed outside the surface casing (1), characterized in that: The fixed sleeve (4) is provided with a support sleeve (5), and the fixed sleeve (4) and the support sleeve (5) are provided with an adjustment structure (7), and a clamping block (6) is connected to the adjustment structure (7). The adjustment structure (7) includes an annular slide rail (701), a sliding seat (702), a drive gear ring (703), a fixed seat (704), and a guide rod (705). The annular slide rail (701) is fixed on the fixed sleeve (4). The sliding seat (702) and the drive gear ring (703) are fixedly connected, and the sliding seat (702) is installed on the annular slide rail (701) through a sliding groove. The fixed seat (704) is fixed on the support sleeve (5). The guide rod (705) is connected to the clamping block (6), and the guide rod (705) passes through the fixed seat (704). The adjustment structure (7) also includes a rotating shaft (706), a follower gear (707), a first transmission gear (708), a rotating rod (709), a second transmission gear (710), a limiting plate (711), and a guide rod (705). The adjusting screw (712) is rotatably mounted on the fixed seat (704). The follower gear (707) and the first transmission gear (708) are fixed on the rotating shaft (706), and the follower gear (707) is meshed with the drive gear ring (703). The rotating rod (709) passes through the fixed seat (704). The second transmission gear (710) is fixed at the end of the rotating rod (709), and the second transmission gear (710) is meshed with the first transmission gear (708). The limiting plate (711) is fixed on the rotating rod (709), and the limiting plate (711) is located on both sides of the fixed seat (704). The adjusting screw (712) is fixed at the end of the rotating rod (709), and the adjusting screw (712) is threadedly connected to the clamping block (6).

2. The anti-backlash tool for oil drilling and production as described in claim 1, characterized in that: The base plate (3) has mounting holes (8), and the fixing sleeve (4) has clamping screws (9), which are arranged in a ring array on the fixing sleeve (4).

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