Drilling tool stabilizer capable of being automatically cleaned

Abstract

The invention relates to the technical field of well drilling, and discloses a drilling tool stabilizer capable of being automatically cleaned, a sectioning ball seat, a center pipe and a ball receiving seat are arranged in a center hole of a stabilizer main body, a ball seat expanding groove is formed in the center hole, and when the sectioning ball seat is attached to the ball seat expanding groove, a steel ball can enter the center pipe through the sectioning ball seat; a reset assembly is arranged between the center pipe and the center hole, sealing pieces are arranged at the two ends of the center pipe, and a drainage groove is formed between the sealing piece relatively close to the ball receiving seat and the ball receiving seat. The central pipe is provided with a conical surface slideway, the bottom surface of the water return tank is provided with a mud pushing plate, the mud pushing plate is arranged in a mounting hole of the water return tank through an ejector rod, the other end of the ejector rod is provided with a sliding block, and the sliding block is arranged in the conical surface slideway; when the center pipe slides towards the male buckle end, the ejector rod drives the mud pushing plate to push outwards, and the reset assembly drives the center pipe to reset after pressure relief is completed. Therefore, silt accumulated in the water return tank can be removed in a mode of increasing and reducing the pump pressure by repeatedly throwing balls, and the phenomenon of mud drum of the drilling tool stabilizer is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, and more particularly to an automatically cleanable drilling tool stabilizer. Background Art

[0002] In oil, gas and geological exploration drilling projects, the drill stabilizer is an important tool for preventing well deviation and repairing wellbore. Due to the structural characteristics of the drill stabilizer itself, mud and sand are easily accumulated in the return water tank of the drill stabilizer during the wellbore repair process, and the drill stabilizer has mud packing phenomenon, which makes the drill stabilizer have complex downhole faults such as poor annular space, leakage formation, and drilling resistance. At this time, it is necessary to trip and remove the mud and sand in the drill stabilizer, which increases the drilling cost and well construction cycle.

[0003] In summary, how to avoid the mud balling phenomenon of the drill tool stabilizer is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a drill stabilizer that can be automatically cleaned, which can remove the mud and sand accumulated in the return water tank by repeatedly throwing balls to increase and decrease the pump pressure, thereby avoiding the mud packing phenomenon of the drill stabilizer.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A self-cleaning drill tool stabilizer comprises a stabilizer body with a through center hole, at least one return water groove connected to the center hole is provided on the outer periphery of the stabilizer body, the center hole is provided with a petal ball seat, a center tube and a ball receiving seat provided at the end of the center tube in sequence from the female buckle end to the male buckle end, a ball seat diameter expansion groove is provided in the center hole, and when the petal ball seat is fitted with the ball seat diameter expansion groove, a steel ball can pass through the petal ball seat and enter the center tube;

[0007] A reset assembly is provided between the central tube and the central hole, and sealing members are provided at both ends of the central tube, and the sealing members are used to seal the gap between the central tube and the central hole, and a drain groove is provided between the sealing member relatively close to the ball receiving seat and the ball receiving seat;

[0008] A conical slideway is provided in the middle of the central tube, a mud pusher is provided on the bottom surface of the return water groove, the mud pusher is arranged in the mounting hole of the return water groove through a push rod, a slider is provided at the other end of the push rod, and the slider is arranged in the conical slideway;

[0009] When the central tube slides toward the male buckle end of the stabilizer body, the push rod drives the mud pusher plate to push outward, and after the pressure relief is completed, the reset assembly drives the central tube to reset.

[0010] Preferably, one end of the split-petal ball seat relatively close to the female buckle end of the stabilizer body is provided with a chamfer, so that the split-petal ball seat can smoothly escape from the ball seat enlarged diameter groove when resetting.

[0011] Preferably, a sealing piston is provided at one end of the central tube which is relatively close to the female buckle end of the stabilizer body.

[0012] Preferably, a sealing ring is provided at one end of the central tube which is relatively close to the male buckle end of the stabilizer body.

[0013] Preferably, a limit pressure ring is provided at the female buckle end of the stabilizer body, and the limit pressure ring is used to limit the position of the petal ball seat.

[0014] Preferably, the water return grooves are evenly distributed along the circumferential direction of the stabilizer body.

[0015] Preferably, the mounting holes of the water return groove are evenly distributed along the extension direction of the center line of the mud pusher plate.

[0016] Preferably, a fixing plate is provided on the outer periphery of the center tube, a positioning step is provided on the center hole between the two sealing members, a return spring is provided between the positioning step and the fixing plate, one end of the return spring is connected to the positioning step, and the other end of the return spring is connected to the fixing plate.

[0017] When the drill tool stabilizer provided by the present invention works normally, the drilling fluid enters the wellbore of the drill tool below through the petal ball seat and the center pipe, and the slider is located at one end of the tapered slideway relatively close to the male buckle end.

[0018] When the return water tank is blocked and mud packing occurs, the pump and the turntable are controlled to stop and the top drive drill pipe is removed, and the steel ball is placed in the water eye of the drilling tool; after the steel ball falls into the petal ball seat, the top drive drill pipe is connected and the pump is turned on. Since the diameter of the steel ball is larger than the inner diameter of the petal ball seat, the steel ball cannot pass through the petal ball seat, causing the pump pressure to increase continuously. The pump pressure pushes the steel ball, the petal ball seat and the center tube to move toward the male buckle end, causing the slider to move toward the female buckle end relative to the conical slideway, and the push rod drives the mud pusher plate to push outward, pushing the mud and sand adhered to the return water tank out flatly. The pushed mud and sand are separated from the return water tank under the action of the drilling tool and the flushing of the drilling fluid, completing the cleaning of the return water tank;

[0019] When the pusher blade is pushed outward to the maximum stroke, the petal ball seat moves down to the ball seat expansion groove and opens under the action of the pump pressure. The outer peripheral surface of the petal ball seat fits with the ball seat expansion groove, which increases the inner diameter of the petal ball seat. The steel ball falls into the ball receiving seat through the petal ball seat and the center pipe, and the drilling fluid is discharged through the drainage trough to complete the pressure relief.

[0020] After the pressure relief is completed, the reset assembly drives the center tube to reset, the slider moves toward the male buckle end relative to the tapered slideway, and the push rod drives the fender to reset.

[0021] Therefore, the drill tool stabilizer provided by the present invention can remove the silt accumulated in the return water tank by repeatedly throwing balls to increase and decrease the pump pressure, thereby ensuring the safety of the cleaning of the drill tool cleaner and the repair of the wellbore, and avoiding the extension of the construction period caused by pulling up and down the drill to remove the silt.

[0022] In addition, the drill tool stabilizer has a simple structure, is easy to operate, can be reused many times, and as a purely mechanical mechanism is not easily affected by the complex downhole environment, has low cost, and is highly practical and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a specific embodiment of the automatic cleaning drill stabilizer provided by the present invention;

[0025] Figure 2 It is a local enlarged view of area A;

[0026] Figure 3 It is a local enlarged view of area B;

[0027] Figure 4 for Figure 1 Schematic diagram of the internal structure of the stabilizer body removed;

[0028] Figure 5 It is a schematic diagram of the assembly of the pusher plate and the push rod in the main viewing direction;

[0029] Figure 6 It is a schematic diagram of the assembly of the pusher plate and the push rod in the side view direction;

[0030] Figure 7 It is a structural schematic diagram of a petal ball seat;

[0031] Figure 8 for Figure 7 Schematic side view of .

[0032] Figure 1-Figure 8 middle:

[0033] 01 is a steel ball, 1 is a stabilizer body, 11 is a ball seat expansion groove, 12 is a return groove, 2 is a limit pressure ring, 3 is a petal ball seat, 4 is a sealing piston, 5 is a center tube, 51 is a conical slideway, 52 is a fixed plate, 53 is a drain groove, 6 is a push rod, 61 is a slider, 7 is a mud pusher, 8 is a return spring, 9 is a sealing ring, and 10 is a ball seat. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The core of the present invention is to provide an automatically cleanable drill stabilizer, which can remove the sediment accumulated in the return water tank by repeatedly throwing balls to increase and decrease the pump pressure, thereby avoiding the mud packing phenomenon of the drill stabilizer.

[0036] The automatic cleaning drill tool stabilizer provided by the present invention comprises a stabilizer body 1 with a through center hole, at least one return groove 12 connected to the center hole is provided on the outer periphery of the stabilizer body 1, and the center hole is provided with a petal ball seat 3, a center tube 5 and a ball receiving seat 10 provided at the end of the center tube 5 in sequence from the female buckle end to the male buckle end, and a ball seat expansion groove 11 is provided in the center hole, and when the petal ball seat 3 is fitted with the ball seat expansion groove 11, the steel ball 01 can pass through the petal ball seat 3 and enter the center tube 5;

[0037] A reset assembly is provided between the central tube 5 and the central hole, and sealing members are provided at both ends of the central tube 5, the sealing members are used to seal the gap between the central tube 5 and the central hole, and a drain groove 53 is provided between the sealing member relatively close to the ball receiving seat 10 and the ball receiving seat 10;

[0038] A conical slideway 51 is provided in the middle of the central tube 5, a mud pusher 7 is provided on the bottom surface of the return water groove 12, and the mud pusher 7 is arranged in the mounting hole of the return water groove 12 through a push rod 6, and a slider 61 is provided at the other end of the push rod 6, and the slider 61 is arranged in the conical slideway 51;

[0039] When the center tube 5 slides toward the male buckle end of the stabilizer body 1 , the push rod 6 drives the mud pusher 7 to push outwards, and after the pressure relief is completed, the reset assembly drives the center tube 5 to reset.

[0040] Please refer to Figure 1 The return grooves 12 are evenly distributed along the circumferential direction of the stabilizer body 1. The return grooves 12 can be set as spiral grooves or linear grooves. The specific number, shape, size and distribution of the return grooves 12 are determined according to actual production needs and will not be repeated here.

[0041] Please refer to Figure 3 The mud pusher 7 is arranged to fit the bottom surface of the return water groove 12. The mud pusher 7 can move back and forth in the return water groove 12 under the action of the push rod 6, so that the mud pusher 7 is relatively far away from or close to the bottom surface of the return water groove 12, thereby scraping away the mud and sand accumulated in the return water groove 12; in order to improve the mud and sand removal effect, the shape and size of the mud pusher 7 are usually set to be the same as the shape and size of the bottom surface of the return water groove 12;

[0042] The mud pusher plate 7 is connected to the return water groove 12 through the push rod 6. The push rod 6 is installed in the mounting hole of the return water groove 12. The mounting holes are usually evenly distributed along the extension direction of the center line of the mud pusher plate 7 so that the force on each part of the mud pusher plate 7 is relatively uniform. The size of the mounting hole is determined according to the outer diameter of the push rod 6 so as to simultaneously realize the reciprocating motion of the push rod 6 and the sealing of the push rod 6 and the mounting hole.

[0043] A slider 61 is provided at the other end of the ejector rod 6. The slider 61 is slidably connected to the conical slideway 51 of the center tube 5. The outer diameter of the conical slideway 51 gradually decreases from the female end to the male end. The slope of the conical slideway 51 is determined according to the outer diameter of the center tube 5 and the stroke of the ejector rod 6 in actual production.

[0044] When the center tube 5 moves along the axial direction of the center hole, the slider 61 moves along the conical slide 51. Since the conical slide 51 is not parallel to the axial direction of the center tube 5, the slider 61 moves along the axial direction of the center tube 5 and along the radial direction of the center tube 5 at the same time, thereby realizing the reciprocating movement of the top rod 6 relative to the bottom surface of the return water groove 12.

[0045] In order to prevent mud and sand from entering the gap between the center tube 5 and the center hole and affecting the movement of the center tube 5 in the axial direction, seals are provided at both ends of the center tube 5. Please refer to Figure 2 A sealing piston 4 is provided at one end of the center tube 5 which is relatively close to the female buckle end of the stabilizer body 1 , and a sealing ring 9 is provided at one end of the center tube 5 which is relatively close to the male buckle end of the stabilizer body 1 .

[0046] The sealing piston 4 and the sealing ring 9 can be connected to the central tube 5 by a detachable connection method such as threaded connection, or by a non-detachable connection method such as welding, or can be designed as an integral structure with the central tube 5.

[0047] The outer diameter of the steel ball 01 is larger than the inner diameter of the petal ball seat 3 in the normal state, and smaller than the inner diameter of the petal ball seat 3 after the diameter is expanded. Therefore, the steel ball 01 can seal the cavity above the steel ball 01, and use the pump pressure to push the petal ball seat 3 and the center tube 5 to move toward the male buckle end, or after the petal ball seat 3 enters the ball seat expansion groove 11, it can fall into the ball receiving seat 10 through the petal ball seat 3 and the center tube 5.

[0048] In order to facilitate the resetting of the petal ball seat 3 and the center tube 5, a resetting component is provided between the center tube 5 and the center hole. The resetting component can be specifically configured as a resetting spring 8, an elastic rope, etc., wherein the resetting spring 8 can be subjected to both tension and pressure, and the resetting spring 8 can be arranged between either end of the center tube 5 and the center hole; while the elastic rope is only subjected to tension, it needs to be arranged between one end of the center tube 5 relatively close to the female buckle end and the center hole. When the center tube 5 moves toward the male buckle end, the elastic rope is pulled and accumulates elastic potential energy, and after the pressure is released, it pulls the center tube 5 and the petal ball seat 3 in the opposite direction to reset.

[0049] Please refer to Figure 1 and Figure 4 A fixing plate 52 is provided on the outer periphery of the center tube 5, a positioning step is provided between the two sealing members in the center hole, a return spring 8 is provided between the positioning step and the fixing plate 52, one end of the return spring 8 is connected to the positioning step, and the other end of the return spring 8 is connected to the fixing plate 52.

[0050] When the pump pressure drives the center tube 5 to move toward the male buckle end, the reset spring 8 accumulates elastic potential energy; after the steel ball 01 falls to the ball receiving seat 10, the drilling fluid is discharged through the drainage trough 53 to relieve the pressure. After the pressure relief is completed, the center tube 5 and the petal ball seat 3 move toward the female buckle end under the elastic restoring force of the reset spring 8 to complete the reset.

[0051] In order to prevent the petal ball seat 3 from falling out of the central hole during resetting, preferably, a limit pressure ring 2 may be provided at the female buckle end of the stabilizer body 1 , and the limit pressure ring 2 is used to limit the position of the petal ball seat 3 .

[0052] The limiting pressure ring 2 is sleeved in the center hole of the stabilizer body 1 by means of threaded connection or snap connection. A through hole for the steel ball 01 to pass through is provided in the limiting pressure ring 2 , and the inner diameter of the through hole is larger than the outer diameter of the steel ball 01 .

[0053] Of course, the limiting pressure ring 2 may also be replaced by a common axial limiting member such as a limiting clamp ring.

[0054] During normal operation, the drilling fluid enters the wellbore of the drilling tool below through the petal ball seat 3 and the central pipe 5. At this time, the slider 61 is located at an end of the conical slideway 51 relatively close to the male buckle end.

[0055] When the return water groove 12 is blocked and mud packing occurs, the pump and the turntable are controlled to stop and the top drive drill pipe is removed, and the steel ball 01 is placed in the water eye of the drilling tool; after the steel ball 01 falls into the petal ball seat 3, the top drive drill pipe is connected and the pump is turned on. Since the diameter of the steel ball 01 is larger than the inner diameter of the petal ball seat 3, the steel ball 01 cannot pass through the petal ball seat 3, so that the pump pressure continues to increase, and the pump pressure pushes the steel ball 01, the petal ball seat 3 and the center tube 5 to move toward the male buckle end, so that the slider 61 moves toward the female buckle end relative to the conical slideway 51, and the push rod 6 drives the mud pusher 7 to push outward, and the mud and sand adhered to the return water groove 12 are pushed out flatly. The pushed mud and sand are separated from the return water groove 12 under the stirring of the drilling tool and the flushing of the drilling fluid, and the return water groove 12 is cleaned;

[0056] When the mud pusher 7 is pushed outward to the maximum stroke, the petal ball seat 3 moves down to the ball seat expansion groove 11 and opens under the action of the pump pressure. The outer peripheral surface of the petal ball seat 3 fits with the ball seat expansion groove 11, so that the inner diameter of the petal ball seat 3 increases, and the steel ball 01 falls into the ball receiving seat 10 through the petal ball seat 3 and the center pipe 5, and the drilling fluid is discharged through the drain groove 53 to complete the pressure relief;

[0057] After the pressure relief is completed, the reset assembly drives the central tube 5 to reset, the slider 61 moves toward the male buckle end relative to the conical slideway 51, and the push rod 6 drives the mud pusher 7 to reset.

[0058] In this embodiment, the accumulated sediment in the return water tank 12 can be removed by repeatedly dropping balls to increase and decrease the pump pressure, thereby ensuring the safety of the drilling tool cleaner and the wellbore repair construction, and avoiding the extension of the construction period caused by the drilling and clearing of sediment.

[0059] In addition, the above-mentioned drill tool stabilizer has a simple structure, is easy to operate, can be reused many times, and as a purely mechanical structure, is not easily affected by the complex downhole environment. It has low cost and strong practicality and reliability.

[0060] Preferably, please refer to Figure 2 and Figure 7 In order to allow the petal ball seat 3 to smoothly escape from the ball seat enlarged diameter groove 11 when resetting, one end of the petal ball seat 3 relatively close to the female buckle end of the stabilizer body 1 may be chamfered.

[0061] In a specific embodiment, three spiral water return grooves 12 are provided on the outer periphery of the stabilizer body 1, and three mounting holes for mounting the push rod 6 are evenly arranged on the bottom surface of the water return groove 12 along the center line direction. The mud pusher 7 is installed in the water return groove 12 through the push rod 6, and the shape and size of the mud pusher 7 are the same as those of the bottom surface of the water return groove 12;

[0062] A conical slideway 51 is provided in the middle of the central tube 5, which corresponds to the return groove 12. The conical slideway 51 and the central tube 5 are an integral structure. The slider 61 at the other end of the push rod 6 is slidably installed in the conical slideway 51. The cross-sectional shapes of the conical slideway 51 and the slider 61 are both approximately right triangles.

[0063] The two ends of the push rod 6 are respectively connected with the slider 61 and the mud pusher 7 by thread.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above is a detailed introduction to the automatic cleaning drill stabilizer provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A self-cleaning drilling tool stabilizer, comprising a stabilizer body (1) with a through center hole, the outer periphery of the stabilizer body (1) being provided with at least one return water groove (12) communicating with the center hole, characterized in that: The center hole is provided with a petal ball seat (3), a center tube (5) and a ball receiving seat (10) arranged at the end of the center tube (5) in sequence from the female buckle end to the male buckle end. A ball seat diameter expansion groove (11) is provided in the center hole. When the petal ball seat (3) is fitted with the ball seat diameter expansion groove (11), the steel ball (01) can enter the center tube (5) through the petal ball seat (3); A reset assembly is provided between the central tube (5) and the central hole, and sealing members are provided at both ends of the central tube (5), the sealing members being used to seal the gap between the central tube (5) and the central hole, and a drain groove (53) is provided between the sealing member relatively close to the ball receiving seat (10) and the ball receiving seat (10); A conical slideway (51) is provided in the middle of the central tube (5), a mud pusher (7) is provided on the bottom surface of the water return groove (12), the mud pusher (7) is arranged in the mounting hole of the water return groove (12) through a push rod (6), a slider (61) is provided at the other end of the push rod (6), and the slider (61) is arranged in the conical slideway (51); When the central tube (5) slides toward the male buckle end of the stabilizer body (1), the push rod (6) drives the mud pusher plate (7) to push outward, and after the pressure relief is completed, the reset component drives the central tube (5) to reset.

2. The self-cleaning drill stabilizer according to claim 1, characterized in that: An end of the split ball seat (3) that is relatively close to the female buckle end of the stabilizer body (1) is provided with a chamfer so that the split ball seat (3) can smoothly escape from the ball seat enlarged diameter groove (11) when resetting.

3. The self-cleaning drill stabilizer according to claim 1, characterized in that: A sealing piston (4) is provided at one end of the central tube (5) which is relatively close to the female buckle end of the stabilizer body (1).

4. The self-cleaning drill stabilizer according to claim 1, characterized in that: A sealing ring (9) is provided at one end of the central tube (5) which is relatively close to the male buckle end of the stabilizer body (1).

5. The automatically cleanable drill stabilizer according to any one of claims 1 to 4, characterized in that: A limiting pressure ring (2) is provided at the female buckle end of the stabilizer body (1), and the limiting pressure ring (2) is used to limit the position of the petal ball seat (3).

6. The automatically cleanable drill stabilizer according to any one of claims 1 to 4, characterized in that: The water return grooves (12) are evenly distributed along the circumferential direction of the stabilizer body (1).

7. The automatically cleanable drill stabilizer according to any one of claims 1 to 4, characterized in that: The mounting holes of the water return groove (12) are evenly distributed along the extension direction of the center line of the mud pusher plate (7).

8. The automatically cleanable drill stabilizer according to any one of claims 1 to 4, characterized in that: A fixing plate (52) is provided on the outer periphery of the center tube (5), a positioning step is provided on the center hole between the two sealing members, a return spring (8) is provided between the positioning step and the fixing plate (52), one end of the return spring (8) is connected to the positioning step, and the other end of the return spring (8) is connected to the fixing plate (52).

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