Setting tool power conversion device for oil and gas well

Abstract

The utility model relates to a setting tool power conversion device for oil and gas wells, which comprises a sleeve, a push-pull rod and a lead screw shaft, the push-pull rod is embedded in the sleeve and can move along the axial direction of the sleeve, and the front end of the push-pull rod is used for being connected with a bridge plug; the lead screw shaft is rotatably installed in the sleeve, the front end of the lead screw shaft is in transmission connection with the rear end of the push-pull rod, and the lead screw shaft is used for driving the push-pull rod to move in the axial direction. The rear end of the lead screw shaft is used for being connected with a rotation driving device capable of driving the lead screw shaft to rotate forwards and backwards. Compared with the prior art, the push-pull force conversion device is simple in structure, the rotation motion is converted into the linear motion of the push-pull rod through the lead screw shaft, the lead screw shaft is driven by the rotation driving device to rotate forwards and backwards, the push-pull force conversion of the bridge plug can be achieved, the push-pull force conversion requirement during setting of the oil and gas well bridge plug can be met, and the application scene is wider.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well perforation technology, and specifically to a power conversion device for setting and sealing tools in oil and gas wells. Background Technology

[0002] In oil and gas well development, bridge plugs are required for interlayer isolation. Currently, gunpowder-type cable bridge plug setting tools and electro-hydraulic setting tools are widely used in China. Gunpowder setting tools use the high-pressure gas generated by gunpowder combustion as the power source to push the bridge plug to achieve setting. This type of setting tool can only generate thrust on the bridge plug. Electro-hydraulic setting tools use a motor to drive a hydraulic pump to generate hydraulic energy to push the bridge plug to achieve setting. Due to the limited downhole space, the installation of directional valves is restricted. Currently, this tool can only push the bridge plug forward downhole and cannot achieve the conversion between thrust and pull on the bridge plug. Under certain working conditions, it is necessary to push and pull the bridge plug sequentially to achieve setting of the oil and gas well bridge plug. Neither of the two existing setting tools can meet the needs of thrust-pull force conversion during bridge plug setting in some oil and gas wells, thus limiting their application scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a power conversion device for setting tools in oil and gas wells, addressing the problem that existing gunpowder setting tools and electro-hydraulic setting tools cannot achieve mutual conversion between thrust and pull forces downhole, thus failing to meet the thrust-pull force conversion requirements during bridge plug setting in some oil and gas wells and limiting their application scenarios.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A power conversion device for setting tools in oil and gas wells includes a sleeve, a push-pull rod, and a lead screw shaft. The push-pull rod is embedded in the sleeve and can move axially along the sleeve, with its front end used to connect with a bridge plug. The lead screw shaft is rotatably mounted in the sleeve, with its front end connected to the rear end of the push-pull rod for driving the push-pull rod to move axially. The rear end of the lead screw shaft is used to connect to a rotary drive device that can drive it to rotate forward and reverse.

[0006] The present invention, employing the aforementioned technical solution, uses a rotary drive device to drive the lead screw shaft to rotate. The rotation of the lead screw shaft, in turn, drives the push-pull rod to move axially, thereby moving the bridge plug. By using the rotary drive device to drive the lead screw shaft to switch between forward and reverse rotation, the push-pull force of the bridge plug can be converted. Compared to existing technologies where explosive setting tools and electro-hydraulic setting tools cannot achieve mutual conversion between thrust and pull forces downhole, thus failing to meet the push-pull force conversion requirements during bridge plug setting in some oil and gas wells and limiting application scenarios, the present invention has a simple structure. It converts rotary motion into linear motion of the push-pull rod through the lead screw shaft, and by using the rotary drive device to drive the lead screw shaft to switch between forward and reverse rotation, the push-pull force of the bridge plug can be converted, meeting the push-pull force conversion requirements during bridge plug setting in oil and gas wells and having a wider range of application scenarios.

[0007] Furthermore, the lead screw shaft and the push-pull rod are connected by a threaded pair transmission; the threaded pair transmission can realize the conversion between rotary motion and linear motion, and the threaded pair structure is simple and easy to manufacture.

[0008] Furthermore, along the front-to-back direction, the lead screw shaft is sequentially provided with a first threaded surface and a mounting surface. The lead screw shaft is threadedly connected to the push-pull rod through the first threaded surface. At least two bearings are fixedly provided on the inner wall of the sleeve, and the inner rings of the bearings are all interference-fitted with the mounting surface. The lead screw shaft is rotatably installed in the sleeve through the bearings, resulting in low rotational friction and high structural stability.

[0009] Furthermore, a shoulder is provided on the lead screw shaft between the first threaded surface and the assembly surface, and a second threaded surface is provided after the assembly surface; a total of two bearings are provided, and a retaining ring is formed on the inner wall of the sleeve, with the two bearings respectively fitted to the two sides of the retaining ring; a fixing nut is connected to the second threaded surface, and the shoulder and the fixing nut are respectively pressed against the end face of the two bearings away from the retaining ring; with this arrangement, the lead screw shaft and bearings are more firmly fixed in the axial direction, the structural strength is higher, and both bearings can withstand a large axial force. Specifically, when the bridge plug is pushed, the front bearing bears the force, and when the bridge plug is pulled, the rear bearing bears the force.

[0010] Furthermore, a blind hole is provided on the rear end face of the push-pull rod, the front end of the lead screw shaft extends into the blind hole, and a third threaded surface is provided on the inner wall of the blind hole for cooperating with the first threaded surface on the lead screw shaft.

[0011] Furthermore, the inner wall of the sleeve is provided with a guide groove, the length direction of which is parallel to the axial direction of the sleeve, and the outer wall of the push-pull rod is provided with a guide block, which is embedded in the guide groove; this arrangement can prevent the push-pull rod from rotating while moving axially.

[0012] Furthermore, buffer pads are provided at both ends of the guide groove; the buffer pads can buffer and absorb energy, and prevent the impact force when the push-pull rod reaches the limit position from damaging the structural stability of the device.

[0013] Furthermore, the rotary drive device includes a motor and a reducer connected together, and the output shaft of the reducer is connected to the rear end of the lead screw shaft; by controlling the forward and reverse rotation of the motor, the conversion of the bridge plug push-pull force can be realized, which can meet the push-pull force conversion requirements when the bridge plug is set in an oil and gas well.

[0014] Furthermore, the sleeve includes a plug, a lead screw sleeve, and a connecting sleeve connected in sequence. The outer wall of the rear end of the plug is threadedly engaged with the inner wall of the front end of the lead screw sleeve, and the outer wall of the rear end of the lead screw sleeve is threadedly engaged with the inner wall of the front end of the connecting sleeve. The sleeve is long and has a complex structure, making it difficult to machine into a single piece. By disassembling the sleeve into a threaded plug, a lead screw sleeve, and a connecting sleeve, manufacturing them separately, and then connecting them to form the sleeve, it is easier to manufacture.

[0015] Furthermore, it also includes a plurality of anti-rotation screws evenly distributed along the circumference of the connecting cylinder, wherein the length direction of any one of the anti-rotation screws is radial, for connecting the connecting cylinder and the lead screw sleeve; the anti-rotation screws are provided to prevent relative rotation between the connecting cylinder and the lead screw sleeve.

[0016] Compared with the existing technology, the advantages of this utility model are: simple structure, converting the rotational motion into the linear motion of the push-pull rod through the lead screw shaft, and driving the lead screw shaft to switch between forward and reverse rotation through the rotation drive device, thus realizing the conversion of the push-pull force of the bridge plug, which can meet the needs of push-pull force conversion when the bridge plug is set in oil and gas wells, and has a wider range of application scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the lead screw shaft structure.

[0019] The markings in the diagram are: 1-Push-pull rod, 2-First sealing ring, 3-Plug, 4-Connecting ring, 5-Protective sleeve, 6-Second sealing ring, 7-Screw sleeve, 8-First buffer pad, 9-Second buffer pad, 10-Screw shaft, 11-Anti-rotation screw, 12-Third sealing ring, 13-Third buffer pad, 14-Fourth buffer pad, 15-Bearing, 16-Fixing nut, 17-Anti-loosening washer, 18-Anti-loosening nut, 19-Connecting cylinder, 20-Guide groove, 21-Guide block, 22-First threaded surface, 23-Shoulder, 24-Assembly surface, 25-Second threaded surface, 26-Retaining ring. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] This embodiment provides a power conversion device for setting tools in oil and gas wells, such as... Figure 1 As shown, it includes a sleeve, a push-pull rod 1, and a lead screw shaft 10. The push-pull rod 1 is embedded in the sleeve and can move along the axial direction of the sleeve. Its front end is used to connect with the bridge plug. The lead screw shaft 10 is rotatably mounted in the sleeve. Its front end is connected to the rear end of the push-pull rod 1 for driving the push-pull rod 1 to move along the axial direction. The rear end of the lead screw shaft 10 is used to connect to a rotary drive device that can drive it to rotate forward and reverse.

[0023] The type of rotary drive device is not limited, as long as it can drive the lead screw shaft 10 to rotate in both forward and reverse directions; in this embodiment, the rotary drive device includes a motor and a reducer connected together, and the output shaft of the reducer is connected to the rear end of the lead screw shaft 10.

[0024] The lead screw shaft 10 and the push-pull rod 1 are connected by a threaded pair; in addition, the lead screw shaft 10 and the push-pull rod 1 can also be connected by a ball screw pair.

[0025] Along the front-to-back direction, the lead screw shaft 10 is provided with a first threaded surface 22 and an assembly surface 24 in sequence. The lead screw shaft 10 is threadedly connected to the push-pull rod 1 through the first threaded surface 22. At least two bearings 15 are fixedly provided on the inner wall of the sleeve. The inner rings of the bearings 15 are all interference-fitted with the assembly surface 24.

[0026] A shoulder 23 is provided on the lead screw shaft 10 between the first threaded surface 22 and the assembly surface 24, and a second threaded surface 25 is provided after the assembly surface 24; a total of two bearings 15 are provided, and a retaining ring 26 is formed on the inner wall of the sleeve. The two bearings 15 are respectively installed on the two sides of the retaining ring 26; a fixing nut 16 is connected to the second threaded surface 25, and the shoulder 23 and the fixing nut 16 are respectively pressed against the end face of the two bearings 15 away from the retaining ring 26.

[0027] A locking nut 18 is also installed on the second threaded surface 25. The locking nut 18 is located behind the fixing nut 16 and is used to prevent the fixing nut 16 from loosening. A locking washer 17 is provided between the locking nut 18 and the fixing nut 16.

[0028] A blind hole is provided on the rear end face of the push-pull rod 1, and the front end of the lead screw shaft 10 extends into the blind hole. A third threaded surface is provided on the inner wall of the blind hole for cooperating with the first threaded surface 22 on the lead screw shaft 10.

[0029] The inner wall of the sleeve is provided with a guide groove 20, the length direction of the guide groove 20 is parallel to the axial direction of the sleeve, and the outer wall of the push-pull rod 1 is provided with a guide block 21, which is embedded in the guide groove 20.

[0030] Both ends of the guide groove 20 are provided with buffer pads; the front end of the guide groove 20 is provided with a first buffer pad 8 and a second buffer pad 9, and the rear end is provided with a third buffer pad 13 and a fourth buffer pad 14.

[0031] The sleeve includes a plug 3, a screw sleeve 7 and a connecting sleeve 19 connected in sequence. The outer wall of the rear end of the plug 3 is threadedly engaged with the inner wall of the front end of the screw sleeve 7, and the outer wall of the rear end of the screw sleeve 7 is threadedly engaged with the inner wall of the front end of the connecting sleeve 19.

[0032] The rear end of the plug 3 and the front end of the shoulder 23 form the two ends of the guide groove 20, respectively. The first buffer pad 8 and the second buffer pad 9 are disposed on the rear end face of the plug 3, and the third buffer pad 13 and the fourth buffer pad 14 are disposed on the front end face of the shoulder 23.

[0033] A protective sleeve 5 is fitted onto the lead screw sleeve 7 to protect the lead screw sleeve 7;

[0034] The plug 3 is provided with an annular groove, and the connecting ring 4 is fixed in the groove for connecting the setting tool;

[0035] It also includes a plurality of anti-rotation screws 11 evenly distributed along the circumference of the connecting cylinder 19, wherein any anti-rotation screw 11 is radially along its length and is used to connect the connecting cylinder 19 and the lead screw sleeve 7.

[0036] A first sealing ring 2 is provided between the push-pull rod 1 and the plug 3, a second sealing ring 6 is provided between the plug 3 and the screw sleeve 7, and a third sealing ring 12 is provided between the screw sleeve 7 and the connecting cylinder 19; these are used to prevent well fluid from entering the power conversion device.

[0037] The motor drives the lead screw shaft 10 to rotate, which in turn drives the push-pull rod 1 to move axially, thereby moving the bridge plug. By switching the motor to forward and reverse, the lead screw shaft 10 can also switch to forward and reverse, thus achieving the conversion of the push-pull force of the bridge plug. Compared with the existing technologies of gunpowder setting tools and electro-hydraulic setting tools, which cannot achieve the conversion of push and pull forces downhole and cannot meet the needs of push-pull force conversion during bridge plug setting in some oil and gas wells, thus limiting the application scenarios, this utility model has a simple structure. It converts the rotational motion of the lead screw shaft 10 into the linear motion of the push-pull rod 1. By controlling the forward and reverse rotation of the motor, the conversion of the push-pull force of the bridge plug can be achieved, which can meet the needs of push-pull force conversion during bridge plug setting in oil and gas wells and has a wider range of applications.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power conversion device for setting tools in oil and gas wells, characterized in that: The device includes a sleeve, a push-pull rod (1), and a lead screw shaft (10). The push-pull rod (1) is fitted inside the sleeve and can move axially along the sleeve. Its front end is used to connect with a bridge plug. The lead screw shaft (10) is rotatably mounted inside the sleeve. Its front end is connected to the rear end of the push-pull rod (1) for driving the push-pull rod (1) to move axially. The rear end of the lead screw shaft (10) is used to connect to a rotary drive device that can drive it to rotate forward and reverse. The lead screw shaft (10) and the push-pull rod (1) are connected by a threaded pair. Along the front-to-back direction, the lead screw shaft (10) is provided with a first threaded surface (22) and an assembly surface (24) in sequence. The lead screw shaft (10) is threadedly connected to the push-pull rod (1) through the first threaded surface (22). At least two bearings (15) are fixedly provided on the inner wall of the sleeve. The inner rings of the bearings (15) are all interference-fitted with the assembly surface (24). The lead screw shaft (10) is provided with a shoulder (23) between the first threaded surface (22) and the assembly surface (24), and a second threaded surface (25) is provided after the assembly surface (24); a total of two bearings (15) are provided, and a retaining ring (26) is formed on the inner wall of the sleeve. The two bearings (15) are respectively installed on the two sides of the retaining ring (26); a fixing nut (16) is connected to the second threaded surface (25), and the shoulder (23) and the fixing nut (16) are respectively pressed on the end face of the two bearings (15) away from the retaining ring (26).

2. The power conversion device for setting tools in oil and gas wells according to claim 1, characterized in that: A blind hole is provided on the rear end face of the push-pull rod (1), and the front end of the lead screw shaft (10) extends into the blind hole. A third threaded surface is provided on the inner wall of the blind hole for cooperating with the first threaded surface (22) on the lead screw shaft (10).

3. The power conversion device for setting tools in oil and gas wells according to claim 1, characterized in that: The inner wall of the sleeve is provided with a guide groove (20), the length direction of the guide groove (20) is parallel to the axial direction of the sleeve, and the outer wall of the push-pull rod (1) is provided with a guide block (21), which is embedded in the guide groove (20).

4. The power conversion device for setting tools in oil and gas wells according to claim 3, characterized in that: Both ends of the guide groove (20) are provided with buffer pads.

5. The power conversion device for setting tools in oil and gas wells according to claim 1, characterized in that: The rotary drive device includes a motor and a reducer connected together, and the output shaft of the reducer is connected to the rear end of the lead screw (10).

6. The power conversion device for setting tools in oil and gas wells according to claim 1, characterized in that: The sleeve includes a plug (3), a screw sleeve (7) and a connecting sleeve (19) connected in sequence. The outer wall of the rear end of the plug (3) is threadedly engaged with the inner wall of the front end of the screw sleeve (7), and the outer wall of the rear end of the screw sleeve (7) is threadedly engaged with the inner wall of the front end of the connecting sleeve (19).

7. The power conversion device for setting tools in oil and gas wells according to claim 6, characterized in that: It also includes a plurality of anti-rotation screws (11) evenly distributed along the circumference of the connecting cylinder (19), wherein any one of the anti-rotation screws (11) is radial in length direction and is used to connect the connecting cylinder (19) and the lead screw sleeve (7).

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