Underground hydraulic control tool capable of being repeatedly opened and closed

Abstract

The utility model provides an underground hydraulic control tool capable of being repeatedly opened and closed, which comprises an outer pipe, and a first circulating hole is arranged on the outer pipe; the switch sleeve is arranged in the outer pipe in a sliding manner; a second circulating hole is formed in the switch sleeve; wherein the switch sleeve is provided with a guide groove, and the guide groove comprises long grooves and short grooves which are alternately arranged; a guide pin assembly is arranged on the outer pipe, and the guide pin assembly is limited in the guide groove; the switch sleeve slides in the axial direction of the outer pipe under the effect of pressure in the pipe, so that the guide pin assembly slides in the guide groove, and when the guide pin assembly slides into the long groove, the first circulation hole coincides with the second circulation hole. And when the guide pin assembly slides into the short groove, the first circulating hole and the second circulating hole are staggered.

Description

Technical Field

[0001] The utility model relates to a downhole hydraulically controlled repeatedly switchable tool, belonging to the technical field of downhole tools in oil fields. Background Art

[0002] After the oil and gas layer is opened, the well needs to use killing fluid to balance the formation pressure before the maintenance of the pump during the production process to ensure the well control safety before completing the well. Killing fluid can easily contaminate the reservoir, increasing the completion cycle and construction cost.

[0003] At present, the method of not suppressing the well is used for oil well completion operations, which are generally divided into three types: the first is the internal control valve for not suppressing the well, which needs to be transmitted through the oil pipe and used on the oil pipe. The oil pipe is pressurized to achieve the switch action, but it cannot be released, and the connection and plugging of the entire wellbore in the casing cannot be achieved. It is not suitable for oil production operations such as pumping and repairing pumps after completion. In addition, this switch action valve relies on the long and short tracks in the tool to achieve action, and its reliability is low. The second is to use continuous oil pipes and other equipment to lower the pressure operation device, but if a large diameter tool or an electric submersible pump with a cable is connected to the pipe string, it is impossible to achieve sealing through the rubber of the blowout preventer, resulting in the failure of the pressure operation. At present, there is no completion tool that can repeatedly and reliably control the connection and plugging of the entire wellbore. Utility Model Content

[0004] In view of the above technical problems existing in the prior art, the utility model proposes a downhole hydraulically controlled repeatedly switching tool, which switches the tool on and off through hydraulic control and ball throwing, thereby realizing the safe raising and lowering operation of the subsequent pipe string without well suppression.

[0005] The utility model proposes a downhole hydraulically controlled repeatedly switchable tool, comprising:

[0006] An outer tube, wherein the outer tube is provided with a first circulation hole;

[0007] A switch sleeve is slidably arranged inside the outer tube, and a second circulation hole is arranged on the switch sleeve;

[0008] Wherein, the switch sleeve is provided with a guide groove, and the guide groove includes long grooves and short grooves arranged alternately; the outer tube is provided with a guide pin assembly, and the guide pin assembly is confined in the guide groove;

[0009] The switch sleeve slides along the axial direction of the outer tube under the action of the pressure inside the tube, so that the guide pin assembly slides in the guide groove. When the guide pin assembly slides into the long groove, the first circulation hole and the second circulation hole coincide with each other; when the guide pin assembly slides into the short groove, the first circulation hole and the second circulation hole are staggered.

[0010] A further improvement of the utility model is that the outer tube comprises a main body located at the upper part and a connecting sleeve located at the lower part, a piston cavity is arranged in the main body, the upper part of the switch sleeve is arranged in the piston cavity, the piston cavity is connected to the pressure in the tube, and the switch sleeve is pushed to move by the pressure in the tube;

[0011] The guide pin assembly and the first circulation hole are arranged on the connecting sleeve.

[0012] A further improvement of the utility model is that a spring is arranged between the switch sleeve and the outer tube, and the spring provides an upward elastic force for the switch sleeve. When the pressure in the piston chamber reaches a certain value, the elastic force is overcome and the switch sleeve is pushed to slide downward. When the pressure in the piston chamber is lower than a certain value, the spring pushes the switch sleeve to slide upward.

[0013] A further improvement of the utility model is that a support sleeve is arranged inside the body, the piston cavity is formed between the body and the support sleeve, and a through hole communicating with the piston cavity is also arranged on the support sleeve.

[0014] A further improvement of the utility model is that a ball seat is arranged inside the switch sleeve, and a pressure-holding ball is dropped into the ball seat, and pressure is held above the ball seat. The pressure above the ball seat enters the piston cavity through the through hole, and when the pressure in the piston cavity reaches a certain value, the switch sleeve is pushed to slide downward.

[0015] A further improvement of the utility model is that the pressure-holding ball is a soluble ball.

[0016] A further improvement of the utility model is that the guide groove comprises an upper groove body and a lower groove body, the upper groove body comprises an upper narrow groove section and an upper expanded groove section, and the lower groove body comprises a lower narrow groove section and a lower expanded groove section;

[0017] The lengths of two adjacent lower narrow groove sections are different, forming the long groove and the short groove.

[0018] A further improvement of the utility model is that the upper expansion slot section includes an upper straight edge arranged along the axial direction and an upper beveled edge inclined along the axial direction; the lower expansion slot section includes a lower straight edge arranged along the axial direction and a lower beveled edge inclined along the axial direction;

[0019] Wherein, the upper oblique edge and the lower oblique edge have different inclination directions.

[0020] A further improvement of the utility model is that the upper straight edge is aligned with the lower bevel edge, and the lower straight edge is aligned with the upper bevel edge;

[0021] When the switch sleeve reciprocates under the action of the piston chamber pressure and the spring elastic force, it slides alternately between the long groove and the short groove.

[0022] A further improvement of the utility model is that a plurality of retaining spring grooves are arranged inside the body, and an anti-retraction retaining spring is arranged on the switch sleeve. When the guide pin assembly slides into the long groove, the anti-retraction retaining spring is fixed in the retaining spring groove.

[0023] A further improvement of the utility model is that chamfers are provided on both sides of the anti-retraction retaining spring, and when the pressure in the piston cavity reaches a certain value, the anti-retraction retaining spring can slide out in the retaining spring groove.

[0024] A further improvement of the utility model is that an upper step is arranged outside the switch sleeve, a lower step is arranged inside the connection sleeve, an elastic cavity is formed between the upper step and the lower step, and the spring is arranged in the elastic cavity.

[0025] A further improvement of the utility model is that a bearing is further arranged in the elastic cavity.

[0026] Compared with the prior art, the advantages of the utility model are:

[0027] According to the downhole hydraulic control of the utility model, the tool can be repeatedly turned on and off, and the tool is turned on and off through hydraulic control and ball throwing, thereby realizing the safe raising and lowering operation of the subsequent pipe string without well suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0029] Figure 1 The figure shows a schematic structural diagram of a downhole hydraulically controlled reversible switchable tool according to an embodiment of the utility model;

[0030] Figure 2 The figure shows a schematic structural diagram of a switch cover according to an embodiment of the utility model;

[0031] The drawings are not drawn to scale.

[0032] The meanings of the reference numerals in the accompanying drawings are as follows:

[0033] 1. Main body, 2. Connecting sleeve, 3. Switch sleeve, 11. Support sleeve, 12. Piston chamber, 13. Retaining ring groove, 14. Elastic chamber, 15. Spring, 16. Bearing, 21. Guide pin assembly, 22. First circulation hole, 31. Guide groove, 32. Second circulation hole, 33. Ball seat, 34. Pressure holding ball, 35. Retaining ring, 36. Lower joint, 311. Upper slot body, 312. Upper narrow slot section, 313. Upper expanded slot section, 314. Lower slot body, 315. Lower narrow slot section, 316. Lower expanded slot section, 317. Long slot, 318. Short slot. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0035] After the oil and gas layer is opened, the well needs to use killing fluid to balance the formation pressure before the maintenance of the pump during the production process to ensure the well control safety before completing the well. Killing fluid can easily contaminate the reservoir, increasing the completion cycle and construction cost.

[0036] At present, the method of not suppressing the well is used for oil well completion operations, which are generally divided into three types: the first is the internal control valve for not suppressing the well, which needs to be transmitted through the oil pipe and used on the oil pipe. The oil pipe is pressurized to achieve the switch action, but it cannot be released, and the connection and plugging of the entire wellbore in the casing cannot be achieved. It is not suitable for oil production operations such as pumping and repairing pumps after completion. In addition, this switch action valve relies on the long and short tracks in the tool to achieve action, and its reliability is low. The second is to use continuous oil pipes and other equipment to lower the pressure operation device, but if a large diameter tool or an electric submersible pump with a cable is connected to the pipe string, it is impossible to achieve sealing through the rubber of the blowout preventer, resulting in the failure of the pressure operation. At present, there is no completion tool that can repeatedly and reliably control the connection and plugging of the entire wellbore.

[0037] In order to solve the above problems, the utility model proposes a downhole hydraulically controlled repeatedly switching tool, which switches the tool on and off through hydraulic control and ball throwing, thereby realizing the safe lifting and lowering operation of the subsequent pipe string without well suppression.

[0038] In such Figure 1 In the embodiment shown, a downhole hydraulically controlled repeatedly switchable tool comprises:

[0039] An outer tube, the outer tube is a cylindrical structure, and a first circulation hole 22 is provided on the outer tube;

[0040] A switch sleeve 3 is slidably disposed inside the outer tube, and a second circulation hole 32 is disposed on the switch sleeve 3;

[0041] The switch sleeve 3 is provided with a guide groove 31 on its circumference, and the guide groove 31 includes long grooves 317 and short grooves 318 that are alternately arranged; the outer tube is provided with a guide pin assembly 21, and the guide pin assembly 21 is limited in the guide groove 31;

[0042] The switch sleeve 3 slides along the axial direction of the outer tube under the action of the pressure inside the tube, so that the guide pin assembly 21 slides in the guide groove 31. When the guide pin assembly 21 slides into the long groove 317, the first circulation hole 22 and the second circulation hole 32 overlap, thereby opening the first circulation hole 22 and the second circulation hole 32; when the guide pin assembly 21 slides into the short groove 318, the first circulation hole 22 and the second circulation hole 32 are staggered, thereby closing the first circulation hole 22 and the second circulation hole 32.

[0043] In the downhole hydraulically controlled repeatedly switchable tool according to the present embodiment, a first circulation hole 22 is provided on the outer tube, and a second circulation hole 32 is provided on the switch sleeve 3. The switch sleeve 3 can be extended and retracted to allow the first circulation hole 22 and the second circulation hole 32 to be staggered or overlapped, thereby opening or closing the circulation hole.

[0044] In one embodiment, the outer tube includes a main body 1 located at the upper part and a connecting sleeve 2 located at the lower part. A piston chamber 12 is provided in the main body 1. The upper part of the switch sleeve 3 is provided in the piston chamber 12. The piston chamber 12 is connected to the pressure in the tube, and the switch sleeve 3 is pushed to move by the pressure in the tube.

[0045] The guide pin assembly 21 and the first circulation hole 22 are arranged on the connecting sleeve 2 .

[0046] In the downhole hydraulically controlled reversible switch tool described in this embodiment, the outer tube is divided into a main body 1 and a connecting sleeve 2, which are connected and separated by a tapered thread or a normal thread. The upper end of the main body 1 is provided with an upper joint connected to the upstream component, and the lower end of the connecting sleeve 2 is provided with a lower joint 36.

[0047] The piston chamber 12 at the upper end of the body 1 is mainly used to drive the switch sleeve 3 , the guide pin assembly 21 on the connecting sleeve 2 is used for guiding, and the first circulation hole 22 is used to cooperate with the second circulation hole 32 .

[0048] In one embodiment, a spring 15 is provided between the switch sleeve 3 and the outer tube, and the spring 15 provides an upward elastic force for the switch sleeve 3 . The elastic force initially pushes the switch sleeve 3 , and the guide pin assembly 21 is located in the long slot 317 or the short slot 318 .

[0049] When the pressure in the piston chamber 12 reaches a certain value, the pressure in the piston overcomes the elastic force and pushes the switch sleeve 3 to slide downward. When the pressure in the piston chamber 12 is lower than a certain value, the spring 15 pushes the switch sleeve 3 to slide upward.

[0050] In one embodiment, a support sleeve 11 is disposed inside the body 1. A step is disposed on the upper portion of the body 1, and the support sleeve 11 is a cylindrical structure, and the support sleeve 11 is sleeved with the body 1, and the support sleeve 11 is connected to the boss above the step.

[0051] The piston chamber 12 is formed between the body 1 and the support sleeve 11 . The piston chamber 12 is formed in the groove below the step, and a through hole communicating with the piston chamber 12 is also provided on the support sleeve 11 .

[0052] The fluid inside the support sleeve 11 can enter the groove through the through hole and increase the pressure in the groove, thereby pushing the switch sleeve 3 to move, so that the guide pin assembly 21 slides in the guide groove 31 until the guide pin assembly 21 slides out of the short groove 318.

[0053] When the pressure in the tube decreases, the pressure in the piston chamber 12 is discharged through the through hole. Under the push of the spring 15, the switch sleeve 3 moves upward, and the guide pin assembly 21 enters the long groove 317. The first circulation hole 22 and the second circulation hole 32 overlap, thereby opening the first circulation hole 22 and the second circulation hole 32.

[0054] When the pressure in the pipe increases, the switch sleeve 3 is pushed to move by the pressure, so that the guide pin assembly 21 slides in the guide groove 31 until the guide pin assembly 21 slides out of the long groove 317 .

[0055] When the pressure in the tube decreases, the pressure in the piston chamber 12 is discharged through the through hole. Under the push of the spring 15, the switch sleeve 3 moves upward, and the guide pin assembly 21 enters the short groove 318. The first circulation hole 22 and the second circulation hole 32 are staggered, thereby closing the circulation hole.

[0056] In one embodiment, a ball seat 33 is disposed inside the switch sleeve 3 , and the ball seat 33 is preferably arranged at the bottom of the switch sleeve 3 .

[0057] By dropping the pressure-holding ball 34 into the ball seat 33, the upper part of the ball seat 33 is pressurized, and the pressure above the ball seat 33 enters the piston chamber 12 through the through hole. When the pressure in the piston chamber 12 reaches a certain value, the switch sleeve 3 is pushed to slide downward.

[0058] In the downhole hydraulically controlled reversible opening and closing tool according to this embodiment, the ball seat 33 can separate the upper part and the lower part. When the pressure-holding ball 34 is put in and falls on the ball seat 33, the pressure in the pipe is increased after the upper part is pressurized. The pressure in the pipe enters the piston chamber 12 through the through hole, thereby pushing the switch sleeve 3 to move downward.

[0059] In one embodiment, the pressure-holding ball 34 is a soluble ball.

[0060] After the switch sleeve 3 slides once, the soluble ball can dissolve quickly, and other operations can be performed, which also provides conditions for the subsequent throwing of the ball.

[0061] In one embodiment, the guide groove 31 includes an upper groove body 311 and a lower groove body 314 . The upper groove body 311 and the lower groove body 314 are in opposite directions in the axial direction and are staggered at a certain angle in the circumferential direction.

[0062] The upper slot body 311 includes an upper narrow slot section 312 and an upper expanded slot section 313 , and the lower slot body 314 includes a lower narrow slot section 315 and a lower expanded slot section 316 .

[0063] The upper narrow slot section 312 and the lower narrow slot section 315 are long slot structures, and the upper expanded slot section 313 and the lower expanded slot section 316 are conical, trapezoidal, fan-shaped or other structures with one side wide and the other side narrow.

[0064] The lengths of two adjacent lower narrow groove sections 315 are different, forming the long groove 317 and the short groove 318 .

[0065] In a preferred embodiment, the upper straight edge is aligned with the lower bevel edge, and the lower straight edge is aligned with the upper bevel edge;

[0066] When the switch sleeve 3 reciprocates under the action of the pressure of the piston chamber 12 and the elastic force of the spring 15 , it slides alternately between the long groove 317 and the short groove 318 .

[0067] In the downhole hydraulically controlled reversible switch tool according to the present embodiment, at the initial stage, the guide pin assembly 21 is in the short slot 318, and the first circulation hole 22 and the second circulation hole 32 are staggered; under the action of the pressure of the piston chamber 12, the switch sleeve 3 moves downward, and the guide pin assembly 21 will slide out of the lower slot body 314 provided with the short slot 318, and then enter the upper slot body 311 along the upper bevel, and in the process of entering the upper slot body 311 along the upper bevel, the switch sleeve 3 will twist by a certain angle. When the pressure of the piston chamber 12 drops, under the action of the elastic force of the spring 15, the guide pin assembly 21 will slide out of the upper slot body 311, and enter the lower slot body 314 provided with the long slot 317 along the lower bevel, and in the process of entering the lower slot body 314 along the lower bevel, the switch sleeve 3 will twist by a certain angle, and at this time, the first circulation hole 22 and the second circulation hole 32 overlap.

[0068] When the pressure in the piston chamber 12 is increased again, the switch sleeve 3 moves downward under the action of the pressure in the piston chamber 12, and the guide pin assembly 21 slides out of the lower slot 314 with the long slot 317, and then enters the next upper slot 311 along the upper bevel. In the process of entering the upper slot 311 along the upper bevel, the switch sleeve 3 twists a certain angle. When the pressure in the piston chamber 12 drops, the guide pin assembly 21 slides out of the upper slot 311 under the action of the elastic force of the spring 15, and enters the lower slot 314 with the short slot 318 along the lower bevel. In the process of entering the lower slot 314 along the lower bevel, the switch sleeve 3 twists a certain angle, and the first circulation hole 22 and the second circulation hole 32 are staggered.

[0069] Thus completing a switching process.

[0070] In one embodiment, a plurality of retaining spring grooves 13 are provided inside the main body 1 , and an anti-retraction retaining spring 35 is provided on the switch sleeve 3 . When the guide pin assembly 21 slides into the long groove 317 , the anti-retraction retaining spring 35 is fixed in the retaining spring groove 13 .

[0071] Preferably, chamfers are provided on both sides of the anti-retraction retaining spring 35 , so that when the pressure in the piston chamber 12 reaches a certain value, the anti-retraction retaining spring 35 can slide out of the retaining spring groove 13 .

[0072] In one embodiment, a bearing 16 is further disposed in the elastic cavity 14 .

[0073] The bearing 16 enables the body 1 and the switch sleeve 3 to rotate relative to each other.

[0074] The process of using the downhole hydraulically controlled repeatedly switchable tool according to this embodiment includes the following steps.

[0075] Initially, the guide pin assembly 21 is in the short slot 318, and the first circulation hole 22 is staggered with the second circulation hole 32. The spring 15 is in an extended state, and the elastic force of the spring 15 pushes the switch cover 3 to an upward position, and the guide pin assembly 21 is locked in the lower slot 314 and is in the short slot 318.

[0076] After the pressure-holding ball 34 is put in, it falls into the ball seat 33. After the pressure is applied from the wellhead, the pressure above the ball seat 33 increases, and the pressure in the pipe enters the piston chamber 12 through the through hole of the support sleeve 11. The pressure in the piston chamber 12 increases, and pushes the switch sleeve 3 to compress the spring 15 and slide downward. At this time, the guide pin assembly 21 slides out of the short groove 318 of the lower groove body 314, enters the straight edge of the lower expansion groove section 316 of the lower groove body 314, and slides out of the lower groove body 314 along the straight edge and enters the upper expansion groove section 313 of the upper groove body 311. Since the straight edge of the lower expansion groove section 316 is opposite to the bevel of the upper expansion groove section 313, the guide pin assembly 21 will enter the bevel of the upper expansion groove section 313, and then enter the upper groove body 311 along the upper bevel. In the process of entering the upper groove body 311 along the upper bevel, the switch sleeve 3 is twisted by a certain angle relative to the body 1 through the bearing 16.

[0077] After that, the pressure in the piston chamber 12 is reduced, and the elastic force of the spring 15 pushes the switch sleeve 3 to move upward, and the fluid in the piston chamber 12 flows out through the through hole. During the upward movement of the switch sleeve 3, the guide pin assembly 21 slides out from the upper slot body 311 along the straight edge into the lower expansion slot section 316 of the next lower slot body 314, and enters the lower expansion slot body along the oblique edge of the lower expansion slot section 316. During the process of entering the lower slot body 314 along the lower oblique edge, the switch sleeve 3 will twist for a certain angle and finally enter the long slot 317, and the anti-retraction retaining spring 35 will be locked in the retaining spring groove 13. At this time, the first circulation hole 22 and the second circulation hole 32 overlap, and the circulation hole is opened.

[0078] The process of closing the loop hole is as follows:

[0079] When the previous pressure-holding ball 34 is dissolved, the next pressure-holding ball 34 is put in, and the pressure-holding ball 34 falls into the ball seat 33. After pressurization from the wellhead, the pressure above the ball seat 33 increases, and the pressure in the pipe enters the piston chamber 12 through the through hole of the support sleeve 11. The pressure in the piston chamber 12 increases. When it increases to a certain value, the anti-retraction retaining spring 35 slides out of the retaining spring groove 13. The pressure in the piston chamber 12 pushes the switch sleeve 3 to compress the spring 15 and slide downward. At this time, the guide pin assembly 21 slides out of the long groove 317 of the lower groove body 314, enters the straight edge of the lower expansion groove section 316 of the lower groove body 314, and slides out of the lower groove body 314 along the straight edge and enters the upper expansion groove section 313 of the upper groove body 311. Since the straight edge of the lower expansion slot section 316 is opposite to the oblique edge of the upper expansion slot section 313, the guide pin assembly 21 will enter the oblique edge of the upper expansion slot section 313, and then enter the upper slot body 311 along the upper oblique edge. In the process of entering the upper slot body 311 along the upper oblique edge, the switch sleeve 3 is twisted by a certain angle relative to the main body 1 through the bearing 16.

[0080] After that, the pressure in the piston chamber 12 is reduced, and the elastic force of the spring 15 pushes the switch sleeve 3 to move upward, and the fluid in the piston chamber 12 flows out through the through hole. During the upward movement of the switch sleeve 3, the guide pin assembly 21 slides out from the upper slot body 311 along the straight edge into the lower expansion slot section 316 of the next lower slot body 314, and enters the lower expansion slot body along the oblique edge of the lower expansion slot section 316. During the process of entering the lower slot body 314 along the lower oblique edge, the switch sleeve 3 will twist for a certain angle and finally enter the segment slot. At this time, the first circulation hole 22 and the second circulation hole 32 are staggered, and the circulation hole is closed.

[0081] Example 1

[0082] A downhole hydraulically controlled repeatedly switchable tool, comprising:

[0083] An outer tube, the outer tube is a cylindrical structure, and a first circulation hole 22 is provided on the outer tube;

[0084] A switch sleeve 3 is slidably disposed inside the outer tube, and a second circulation hole 32 is disposed on the switch sleeve 3;

[0085] The switch sleeve 3 is provided with a guide groove 31 on its circumference, and the guide groove 31 includes long grooves 317 and short grooves 318 that are alternately arranged; the outer tube is provided with a guide pin assembly 21, and the guide pin assembly 21 is limited in the guide groove 31;

[0086] The switch sleeve 3 slides along the axial direction of the outer tube under the action of the pressure inside the tube, so that the guide pin assembly 21 slides in the guide groove 31. When the guide pin assembly 21 slides into the long groove 317, the first circulation hole 22 and the second circulation hole 32 overlap, thereby opening the first circulation hole 22 and the second circulation hole 32; when the guide pin assembly 21 slides into the short groove 318, the first circulation hole 22 and the second circulation hole 32 are staggered, thereby closing the first circulation hole 22 and the second circulation hole 32.

[0087] The outer tube includes a main body 1 at the upper part and a connecting sleeve 2 at the lower part. A piston chamber 12 is provided in the main body 1. The upper part of the switch sleeve 3 is provided in the piston chamber 12. The piston chamber 12 is connected to the pressure in the tube, and the switch sleeve 3 is pushed to move by the pressure in the tube.

[0088] The guide pin assembly 21 and the first circulation hole 22 are arranged on the connecting sleeve 2 .

[0089] The piston chamber 12 at the upper end of the body 1 is mainly used to drive the switch sleeve 3 , the guide pin assembly 21 on the connecting sleeve 2 is used for guiding, and the first circulation hole 22 is used to cooperate with the second circulation hole 32 .

[0090] A spring 15 is provided between the switch sleeve 3 and the outer tube. The spring 15 provides an upward elastic force for the switch sleeve 3 . The elastic force pushes the switch sleeve 3 initially, and the guide pin assembly 21 is located in the long slot 317 or the short slot 318 .

[0091] When the pressure in the piston chamber 12 reaches a certain value, the pressure in the piston overcomes the elastic force and pushes the switch sleeve 3 to slide downward. When the pressure in the piston chamber 12 is lower than a certain value, the spring 15 pushes the switch sleeve 3 to slide upward.

[0092] A support sleeve 11 is arranged inside the body 1. A step is arranged on the upper part of the body 1. The support sleeve 11 is a cylindrical structure, and the support sleeve 11 is sleeved with the body 1, and the support sleeve 11 is connected to the boss above the step.

[0093] The piston chamber 12 is formed between the body 1 and the support sleeve 11 . The piston chamber 12 is formed in the groove below the step, and a through hole communicating with the piston chamber 12 is also provided on the support sleeve 11 .

[0094] The fluid inside the support sleeve 11 can enter the groove through the through hole and increase the pressure in the groove, thereby pushing the switch sleeve 3 to move, so that the guide pin assembly 21 slides in the guide groove 31 until the guide pin assembly 21 slides out of the short groove 318.

[0095] A ball seat 33 is provided inside the switch sleeve 3 , and the ball seat 33 is preferably arranged at the bottom of the switch sleeve 3 .

[0096] By dropping the pressure-holding ball 34 into the ball seat 33, the upper part of the ball seat 33 is pressurized, and the pressure above the ball seat 33 enters the piston chamber 12 through the through hole. When the pressure in the piston chamber 12 reaches a certain value, the switch sleeve 3 is pushed to slide downward.

[0097] The pressure-holding ball 34 is a soluble ball.

[0098] After the switch sleeve 3 slides once, the soluble ball can dissolve quickly, and other operations can be performed, which also provides conditions for the subsequent throwing of the ball.

[0099] The guide groove 31 includes an upper groove body 311 and a lower groove body 314 . The upper groove body 311 and the lower groove body 314 are in opposite directions in the axial direction and are staggered at a certain angle in the circumferential direction.

[0100] The upper slot body 311 includes an upper narrow slot section 312 and an upper expanded slot section 313 , and the lower slot body 314 includes a lower narrow slot section 315 and a lower expanded slot section 316 .

[0101] The upper narrow slot section 312 and the lower narrow slot section 315 are long slot structures, and the upper expanded slot section 313 and the lower expanded slot section 316 are conical, trapezoidal, fan-shaped or other structures with one side wide and the other side narrow.

[0102] The lengths of two adjacent lower narrow groove sections 315 are different, forming the long groove 317 and the short groove 318 .

[0103] The upper straight edge is aligned with the lower bevel edge, and the lower straight edge is aligned with the upper bevel edge;

[0104] When the switch sleeve 3 reciprocates under the action of the pressure of the piston chamber 12 and the elastic force of the spring 15 , it slides alternately between the long groove 317 and the short groove 318 .

[0105] A plurality of retaining spring grooves 13 are provided inside the body 1 , and an anti-retraction retaining spring 35 is provided on the switch sleeve 3 . When the guide pin assembly 21 slides into the long groove 317 , the anti-retraction retaining spring 35 is locked in the retaining spring groove 13 .

[0106] Chamfers are provided on both sides of the anti-retraction retaining spring 35 , and when the pressure in the piston chamber 12 reaches a certain value, the anti-retraction retaining spring 35 can slide out in the retaining spring groove 13 .

[0107] During the construction process:

[0108] When entering the production stage, the production tubing is lowered and the well-killing tool is lowered into the well along with the tubing. The order of tools from bottom to top is guide shoe, downhole hydraulic control repeatedly switch tool, tubing, well-killing tool, tubing to the wellhead.

[0109] Initially, the guide pin assembly 21 is in the short slot 318, and the first circulation hole 22 is staggered with the second circulation hole 32. The spring 15 is in an extended state, and the elastic force of the spring 15 pushes the switch cover 3 to an upward position, and the guide pin assembly 21 is locked in the lower slot 314 and is in the short slot 318.

[0110] After the pressure-holding ball 34 is put in, it falls into the ball seat 33. After the pressure is applied from the wellhead, the pressure above the ball seat 33 increases, and the pressure in the pipe enters the piston chamber 12 through the through hole of the support sleeve 11. The pressure in the piston chamber 12 increases, and pushes the switch sleeve 3 to compress the spring 15 and slide downward. At this time, the guide pin assembly 21 slides out of the short groove 318 of the lower groove body 314, enters the straight edge of the lower expansion groove section 316 of the lower groove body 314, and slides out of the lower groove body 314 along the straight edge and enters the upper expansion groove section 313 of the upper groove body 311. Since the straight edge of the lower expansion groove section 316 is opposite to the oblique edge of the upper expansion groove section 313, the guide pin assembly 21 will enter the oblique edge of the upper expansion groove section 313, and then enter the upper groove body 311 along the upper oblique edge. In the process of entering the upper groove body 311 along the upper oblique edge, the switch sleeve 3 will twist by a certain angle.

[0111] After that, the pressure in the piston chamber 12 is reduced, and the elastic force of the spring 15 pushes the switch sleeve 3 to move upward, and the fluid in the piston chamber 12 flows out through the through hole. During the upward movement of the switch sleeve 3, the guide pin assembly 21 slides out from the upper slot body 311 along the straight edge into the lower expansion slot section 316 of the next lower slot body 314, and enters the lower expansion slot body along the oblique edge of the lower expansion slot section 316. During the process of entering the lower slot body 314 along the lower oblique edge, the switch sleeve 3 will twist for a certain angle and finally enter the long slot 317, and the anti-retraction retaining spring 35 will be locked in the retaining spring groove 13. At this time, the first circulation hole 22 and the second circulation hole 32 overlap, and the circulation hole is opened.

[0112] The process of closing the loop hole is as follows:

[0113] When the previous pressure-holding ball 34 is dissolved, the next pressure-holding ball 34 is put in, and the pressure-holding ball 34 falls into the ball seat 33. After pressurization from the wellhead, the pressure above the ball seat 33 increases, and the pressure in the pipe enters the piston chamber 12 through the through hole of the support sleeve 11. The pressure in the piston chamber 12 increases. When it increases to a certain value, the anti-retraction retaining spring 35 slides out of the retaining spring groove 13. The pressure in the piston chamber 12 pushes the switch sleeve 3 to compress the spring 15 and slide downward. At this time, the guide pin assembly 21 slides out of the long groove 317 of the lower groove body 314, enters the straight edge of the lower expansion groove section 316 of the lower groove body 314, and slides out of the lower groove body 314 along the straight edge and enters the upper expansion groove section 313 of the upper groove body 311. Since the straight edge of the lower expansion slot section 316 is opposite to the oblique edge of the upper expansion slot section 313, the guide pin assembly 21 will enter the oblique edge of the upper expansion slot section 313, and then enter the upper slot body 311 along the upper oblique edge. In the process of entering the upper slot body 311 along the upper oblique edge, the switch sleeve 3 will twist at a certain angle.

[0114] After that, the pressure in the piston chamber 12 is reduced, and the elastic force of the spring 15 pushes the switch sleeve 3 to move upward, and the fluid in the piston chamber 12 flows out through the through hole. During the upward movement of the switch sleeve 3, the guide pin assembly 21 slides out from the upper slot body 311 along the straight edge into the lower expansion slot section 316 of the next lower slot body 314, and enters the lower expansion slot body along the oblique edge of the lower expansion slot section 316. During the process of entering the lower slot body 314 along the lower oblique edge, the switch sleeve 3 will twist for a certain angle and finally enter the segment slot. At this time, the first circulation hole 22 and the second circulation hole 32 are staggered, and the circulation hole is closed.

[0115] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0116] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0117] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0118] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the utility model. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0119] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0120] Although the preferred embodiments of the utility model have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the utility model, and changes and / or modifications made according to the embodiments of the utility model should be included within the scope of protection of the utility model.

Claims

1. A downhole hydraulically controlled reversible switchable tool, characterized in that: include: An outer tube, wherein the outer tube is provided with a first circulation hole (22); A switch sleeve (3) slidably arranged inside the outer tube, the switch sleeve (3) being provided with a second circulation hole (32); The switch sleeve (3) is provided with a guide groove (31), the guide groove (31) comprising long grooves (317) and short grooves (318) arranged alternately; the outer tube is provided with a guide pin assembly (21), the guide pin assembly (21) being confined within the guide groove (31); The switch sleeve (3) slides along the axial direction of the outer tube under the action of the pressure in the tube, thereby causing the guide pin assembly (21) to slide in the guide groove (31); when the guide pin assembly (21) slides into the long groove (317), the first circulation hole (22) and the second circulation hole (32) overlap; when the guide pin assembly (21) slides into the short groove (318), the first circulation hole (22) and the second circulation hole (32) are offset.

2. The downhole hydraulically controlled reversible opening and closing tool according to claim 1, characterized in that: The outer tube comprises a main body (1) located at the upper part and a connecting sleeve (2) located at the lower part, a piston chamber (12) is arranged in the main body (1), the upper part of the switch sleeve (3) is arranged in the piston chamber (12), the piston chamber (12) is connected to the pressure in the tube, and the switch sleeve (3) is pushed to move by the pressure in the tube; The guide pin assembly (21) and the first circulation hole (22) are arranged on the connecting sleeve (2).

3. The downhole hydraulically controlled reversible opening and closing tool according to claim 2, characterized in that: A spring (15) is provided between the switch sleeve (3) and the outer tube, and the spring (15) provides an upward elastic force for the switch sleeve (3). When the pressure in the piston chamber (12) reaches a certain value, the elastic force is overcome and the switch sleeve (3) is pushed to slide downward. When the pressure in the piston chamber (12) is lower than a certain value, the spring (15) pushes the switch sleeve (3) to slide upward.

4. The downhole hydraulically controlled reversible opening and closing tool according to claim 3, characterized in that: A support sleeve (11) is provided inside the body (1), the piston chamber (12) is formed between the body (1) and the support sleeve (11), and a through hole communicating with the piston chamber (12) is also provided on the support sleeve (11).

5. The downhole hydraulically controlled reversible opening and closing tool according to claim 4, characterized in that: A ball seat (33) is provided inside the switch sleeve (3). By dropping a pressure-holding ball (34) into the ball seat (33), pressure is held above the ball seat (33). The pressure above the ball seat (33) enters the piston chamber (12) through the through hole. When the pressure in the piston chamber (12) reaches a certain value, the switch sleeve (3) is pushed to slide downward.

6. The downhole hydraulically controlled reversible opening and closing tool according to claim 5, characterized in that: The pressure-holding ball (34) is a soluble ball.

7. The downhole hydraulically controlled reversible opening and closing tool according to any one of claims 3 to 6, characterized in that: The guide groove (31) comprises an upper groove body (311) and a lower groove body (314); the upper groove body (311) comprises an upper narrow groove section (312) and an upper expanded groove section (313); and the lower groove body (314) comprises a lower narrow groove section (315) and a lower expanded groove section (316); The lengths of two adjacent lower narrow groove sections (315) are different, forming the long groove (317) and the short groove (318).

8. The downhole hydraulically controlled reversible opening and closing tool according to claim 7, characterized in that: The upper expansion slot section (313) comprises an upper straight edge arranged along the axial direction and an upper beveled edge inclined along the axial direction; the lower expansion slot section (316) comprises a lower straight edge arranged along the axial direction and a lower beveled edge inclined along the axial direction; Wherein, the upper oblique edge and the lower oblique edge have different inclination directions.

9. The downhole hydraulically controlled reversible opening and closing tool according to claim 8, characterized in that: The upper straight edge is aligned with the lower bevel edge, and the lower straight edge is aligned with the upper bevel edge; When the switch sleeve (3) moves back and forth under the action of the pressure of the piston chamber (12) and the elastic force of the spring (15), it slides alternately between the long groove (317) and the short groove (318).

10. The downhole hydraulically controlled reversible opening and closing tool according to claim 9, characterized in that: A plurality of retaining spring grooves (13) are arranged inside the body (1), and an anti-retraction retaining spring (35) is arranged on the switch sleeve (3); when the guide pin assembly (21) slides into the long groove (317), the anti-retraction retaining spring (35) is retained in the retaining spring groove (13).

11. The downhole hydraulically controlled reversible opening and closing tool according to claim 10, characterized in that: Chamfers are provided on both sides of the anti-retraction retaining spring (35), and when the pressure in the piston chamber (12) reaches a certain value, the anti-retraction retaining spring (35) can slide out in the retaining spring groove (13).

12. The downhole hydraulically controlled reversible opening and closing tool according to claim 11, characterized in that: An upper step is provided on the outside of the switch sleeve (3), a lower step is provided on the inside of the connection sleeve (2), an elastic cavity (14) is formed between the upper step and the lower step, and the spring (15) is arranged in the elastic cavity (14).

13. The downhole hydraulically controlled reversible opening and closing tool according to claim 12, characterized in that: A bearing (16) is also provided in the elastic cavity (14).

Images