Downhole anti-sloughing device for horizontal well

Abstract

The application discloses a horizontal well downhole anti-slipping device, which comprises a cylindrical main body, a fishing rod inserted into the main body, and a shear pin connecting the main body and the fishing rod; the fishing rod protrudes out of the main body at both ends; the surface of the main body is provided with a clamping spring anti-slipping device and a tooth block anti-slipping device. The horizontal well downhole anti-slipping device is hung on the inner wall of the oil pipe by the teeth on the tooth block, and the tooth block and the main body are in contact with each other on the inclined taper surface; the greater the weight of the upper falling object is, the tighter the combination between the tooth block and the oil pipe wall is, so that the carrying capacity is larger, the use is reliable, and the tooth block will not slip off; during the process of lowering into the well, when reaching the predetermined position, the method of emergency braking is adopted to make the device stop suddenly, and the inertia force generated can separate the delivery device from the anti-slipping device; meanwhile, the tooth block slides out under the action of the compression spring and is fixed on the inner wall of the oil pipe through the teeth to achieve the purpose of hanging, and the use is very convenient.

Description

Technical Field

[0001] This invention belongs to the technical field of production process equipment for horizontal wells in gas fields, and specifically relates to a downhole anti-slip device for horizontal wells. Background Technology

[0002] Currently, downhole chokes are widely installed in natural gas well production control. Their key feature is that after natural gas passes through the nozzle, the pressure decreases, the volume expands, and a heat absorption and cooling process occurs entirely downhole, utilizing geothermal heat for natural heating. This prevents the nozzle from freezing and causing blockages. However, installing downhole chokes in horizontal and deviated wells carries significant risks. If the downhole choke fails, it can easily fall to the bottom of the well. Horizontal wells have a horizontal pipe section in the middle of the gas layer and a large section of curved pipe above the gas layer. The lower part of the curved pipe connects to the horizontal pipe section, and the upper part connects to the vertical pipe section. The downhole choke can only operate within the vertical pipe section. Therefore, if the downhole choke fails, it can easily fall to the junction of the curved and horizontal sections. At this point, the downhole choke cannot be retrieved from the well, and over time, it can clog the tubing, causing a downhole accident that is difficult to handle, impacting gas well production and resulting in significant economic losses. Summary of the Invention

[0003] The technical solution adopted in this invention is to provide a horizontal well downhole anti-slip device, which has the feature of preventing the device inside the well from slipping when working in a horizontal well.

[0004] The technical solution adopted in this invention is to provide a horizontal well downhole anti-slip device, which includes a cylindrical main body, a fishing rod inserted inside the main body, and the main body and the fishing rod connected by shear pins; the two ends of the fishing rod protrude out of the main body; and the surface of the main body is provided with a snap ring anti-slip device and a toothed block anti-slip device.

[0005] The invention is further characterized by:

[0006] There are three anti-slip devices for the retaining spring and the tooth block.

[0007] The snap ring anti-slip device includes a groove a opened on the surface of the main body, and a snap ring is connected in the groove a by a pin.

[0008] The anti-slip device for the tooth block includes a locking ring and a pressure ring sleeved on the main body, and the locking ring and the pressure ring are connected by a compression spring;

[0009] The main body has an inclined groove extending from the surface of the main body towards the axis of the main body. The angle formed between the direction of the inclined groove and the axis of the main body is 0.5-0.5 degrees. The cross-section of the inclined groove is convex.

[0010] The top of the pressure ring abuts against a toothed block, and the toothed block is provided with a protrusion that matches the inclined groove. The side of the toothed block away from the main body is serrated.

[0011] A recessed cavity is formed on the inner surface of the locking ring, and a chamfer is provided between the recessed cavity and the inner surface of the locking ring. A through hole is formed radially on the main body at a position corresponding to the recessed cavity, and a locking block that cooperates with the recessed cavity is provided in the through hole. A groove b that cooperates with the locking block is formed on the outer surface of the retrieval rod.

[0012] A pin is installed near the top of the inclined groove.

[0013] The outer surface of the salvage rod has a threaded retaining ring near the bottom.

[0014] A guide head is threaded onto the outer surface of the main body near the bottom.

[0015] A fixing block is fixed near the top of the salvage rod.

[0016] An outer annular groove is formed on the outer surface of the main body near the top.

[0017] The beneficial effects of this invention are:

[0018] 1. The horizontal well downhole anti-slip device of the present invention relies on the teeth on the tooth block to suspend it on the inner wall of the oil pipe. The tooth block and the main body are in contact with the inclined conical surface. The greater the weight of the object falling on the upper part, the tighter the bond between the tooth block and the oil pipe wall. Therefore, it has a large load-bearing capacity, is reliable in use, and will not slip off and fall down.

[0019] 2. During the lowering process of the horizontal well anti-slip device of the present invention, when it reaches the predetermined position, it uses an emergency braking method to stop it suddenly. The inertial force generated can separate the delivery device from the anti-slip device. At the same time, the toothed block slides out under the action of the compression spring and is fixed to the inner wall of the tubing by its teeth to achieve the purpose of suspension. It is very convenient to use.

[0020] 3. The downhole anti-slip device of the present invention is simple in structure, easy to deploy and retrieve, can prevent objects from falling from above, and has a large load-bearing capacity. It is deployed in advance below the downhole choke and is suitable for use in high-pressure gas wells. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the horizontal well downhole anti-slip device of the present invention;

[0022] Figure 2 This is a top view of the horizontal well downhole anti-slip device of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the horizontal well anti-slip device of the present invention during its lowering into the well.

[0024] Figure 4 This is a schematic diagram of the working state of the horizontal well downhole anti-slip device of the present invention.

[0025] Among them, 1. salvage rod, 2. main body, 3. shaft pin, 4. snap ring, 5. pin, 6. toothed block, 7. pressure ring, 8. pressure spring, 9. locking ring, 10. locking block, 11. shear pin, 12. snap ring, 13. guide head, 14. locking sleeve, 15. split snap sleeve, 16. oil pipe, 17. groove a, 18. inclined groove, 19. countersunk cavity, 20. protrusion, 21. groove b, 22. fixing block. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a horizontal well downhole anti-slip device, such as... Figure 1 As shown, the device includes a cylindrical main body 2, with a retrieval rod 1 inserted inside. Both ends of the retrieval rod 1 protrude from the main body 2. A retaining ring 12 is threadedly connected to the outer surface of the retrieval rod 1 near the bottom. A guide head 13 is threadedly connected to the outer surface of the main body 2 near the bottom. A fixing block 22 is fixedly connected to the retrieval rod 1 near the top. An outer annular groove is formed on the outer surface of the main body 2 near the top. The main body 2 and the retrieval rod 1 are connected by shear pins 11. Figure 2 As shown, the surface of the main body 2 is provided with at least 3 snap ring anti-slip devices and tooth block anti-slip devices.

[0028] The snap ring anti-slip device includes a groove a17 opened on the surface of the main body 2, and a snap ring 4 is connected in the groove a17 by a shaft pin 3.

[0029] The anti-slip device for the tooth block includes a locking ring 9 and a pressure ring 7 sleeved on the main body 2. The locking ring 9 and the pressure ring 7 are connected by a compression spring 8.

[0030] The main body 2 has an inclined groove 18 extending from the surface of the main body 2 toward the axis of the main body 2. A pin 5 is installed near the top of the inclined groove 18. The angle formed between the extension direction of the inclined groove 18 and the axis of the main body 2 is 13 degrees to 23 degrees. The cross-section of the inclined groove 18 is convex.

[0031] The top of the pressure ring 7 abuts against the toothed block 6, and the toothed block 6 is provided with a protrusion 20 that cooperates with the inclined groove 18. The side of the toothed block 6 away from the main body 2 is serrated.

[0032] A recessed cavity 19 is provided on the inner surface of the locking ring 9. A chamfer is provided between the recessed cavity 19 and the inner surface of the locking ring 9. A through hole is provided on the main body 2 at a position corresponding to the recessed cavity 19 in the radial direction. A locking block 10 that cooperates with the recessed cavity 19 is provided in the through hole. A groove b21 that cooperates with the locking block 10 is provided on the outer surface of the retrieval rod 1.

[0033] The working process of the horizontal well downhole anti-slip device of the present invention is as follows:

[0034] Before lowering the device into the well, the upper outer annular groove of the main body 2 is fitted onto the lower inner annular protrusion of the dispenser's segmented sleeve 15. The lower end of the dispenser's locking sleeve 14 retracts and encloses each tooth block 6 downwards, bringing them together. The rope cap is then connected, and the dispenser and the downhole anti-slip device are lowered into the well together via a wire rope. During the lowering process, the operation should be smooth. When the device is lowered to the predetermined well depth, an emergency brake should be applied. At this time, the inertia generated by the horizontal well downhole anti-slip device of this invention pulls the main body 2 to continue moving downwards. The dispenser spring is compressed, and the main body 2 pulls the segmented sleeve 15 downwards. Simultaneously, the lower end of the segmented sleeve 15 opens, separating the upper end of the main body 2 from the segmented sleeve 15 and the lower end of the locking sleeve 14 from the tooth blocks 6, thus separating the dispenser from the anti-slip device. At this time, the compression spring 8 pushes the tooth block 6 upward through the compression ring 7. The tooth block 6 will move outward along the inclined surface in the longitudinal groove of the main body 2, and the teeth on the tooth block 6 will engage with the inner surface of the tubing 16, thus fixing the anti-slip device inside the downhole tubing. The delivery device is then pulled out to the surface along with the wire rope.

[0035] When it is necessary to remove the anti-slip device from the well, the retrieval tool is lowered into the well via a wire rope and aligned with the retrieval rod 1. Then, the wire rope is pulled up, and the retrieval rod 1 moves the retaining ring 12 upward together, cutting the shear pin 11. When the annular groove in the middle of the retrieval rod 1 aligns with the locking block 10, the pressure spring 8 pushes the locking ring 9 to push the locking block 10 into the groove, and the pressure spring 8 is released. At this time, the toothed block 6, the pressure ring 7, the pressure spring 8, and the locking ring 9 move downward together, and at the same time, each toothed block retracts inward together, separating from the inner wall of the tubing. The downhole anti-slip device can then be retrieved from the well to the surface.

Claims

1. A horizontal well downhole anti-slip device, characterized in that, It includes a cylindrical body (2), a retrieval rod (1) inserted inside the body (2), and the body (2) and the retrieval rod (1) are connected by scissor pins (11); the two ends of the retrieval rod (1) protrude out of the body (2); the surface of the body (2) is provided with a snap spring anti-slip device and a tooth block anti-slip device; There are three types of anti-slip devices: the snap ring anti-slip device and the tooth block anti-slip device. The snap ring anti-slip device includes a groove a (17) opened on the surface of the main body (2), and a snap ring (4) is connected in the groove a (17) by a shaft pin (3). The tooth block anti-slip device includes a locking ring (9) and a pressure ring (7) sleeved on the main body (2), and the locking ring (9) and the pressure ring (7) are connected by a compression spring (8); The main body (2) has an inclined groove (18) extending from the surface of the main body (2) toward the axis of the main body (2). The angle between the extension direction of the inclined groove (18) and the axis of the main body (2) is 13 degrees to 23 degrees. The cross-section of the inclined groove (18) is "convex". The top of the pressure ring (7) abuts against the toothed block (6), and the toothed block (6) is provided with a protrusion (20) that cooperates with the inclined groove (18). The side of the toothed block (6) away from the main body (2) is serrated. The inner surface of the locking ring (9) is provided with a recessed cavity (19), and a chamfer is provided between the recessed cavity (19) and the inner surface of the locking ring (9). A through hole is provided on the main body (2) at a position corresponding to the recessed cavity (19) in the radial direction. A locking block (10) that cooperates with the recessed cavity (19) is provided in the through hole. A groove b (21) that cooperates with the locking block (10) is provided on the outer surface of the retrieval rod (1). A pin (5) is installed near the top of the inclined groove (18); The retrieval rod (1) has a snap ring (12) threaded on its outer surface near the bottom. The outer surface of the main body (2) is threaded with a guide head (13) near the bottom; the retrieval rod (1) is fixed with a fixing block (22) near the top. The outer surface of the main body (2) near the top has an outer annular groove.

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