Spinning locking hydraulic reinforcement jam releasing device combination with safety releasing function

Abstract

The invention discloses a self-rotating locking hydraulic reinforcement jam releasing device combination with a safety releasing function. The self-rotating locking hydraulic reinforcement jam releasing device combination comprises a hydraulic reinforcement device, a safety releasing device and a rotary stop valve which can be connected together in sequence. In the fish jam releasing process, the tool string is lifted upwards, self-rotation locking of the rotary stop valve is achieved, a flow channel is closed, and then pressurization jam releasing is conducted. And meanwhile, the safe releasing device can ensure that releasing is carried out in time when unfreezing fails. The tool combination is suitable for salvaging the fallen fish in the small casing pipe which is blank in the market, and has positive reference and popularization effects on improvement of hydraulic jam releasing related equipment.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools in oil and gas fields, and is a self-spinning locking hydraulic force-increasing jam-releasing device combination with a safety release device. Background Art

[0002] In recent years, as exploration and development continue to move towards deep, ultra-deep and unconventional gas reservoirs, deep wells, ultra-deep wells, highly deviated wells and horizontal wells are increasing. Such wells often have large friction when lifting and lowering due to the depth of the well and poor wellbore trajectory. When using drilling tools to salvage fish in the pipe string, the lifting force cannot be accurately transmitted to the top of the fish. In addition, the lifting load of the operating machine is limited, resulting in insufficient lifting force on the top of the fish, which leads to failure in unstuck and seriously affects the progress of complex fault handling. In order to speed up the progress of complex handling of drill stuck in small-sized casing in horizontal wells and highly deviated wells, it is necessary to develop a hydraulic salvage device for fish in horizontal wells and highly deviated wells. Summary of the invention

[0003] The present invention provides a hydraulic booster device and a rotary stop valve with a safe release function, which overcome the deficiencies of the above-mentioned existing technologies and can effectively solve the problem that the lifting force cannot be accurately transmitted to the top of the fish, and the lifting load of the operating machine is limited, resulting in insufficient lifting force acting on the top of the fish, thereby causing unjamming failure. At the same time, the tool has its own safe release device, which can smoothly release the tool when unjamming fails, avoiding escalation of accidents.

[0004] To achieve the above purpose, the technical solution of the self-spinning locking hydraulic booster release device with a safety release function of the present invention is: a self-spinning locking hydraulic booster release device combination with a safety release function, including a hydraulic booster device, a rotary stop valve and a safety release device connected below the hydraulic booster device. The rotary stop valve is used to lift and hold pressure to construct a closed cavity, so that the hydraulic booster device generates the lifting force required for release.

[0005] The hydraulic booster device comprises a hydraulic booster device mandrel and a hydraulic booster device housing. The lower end of the hydraulic booster device mandrel is an integrally turned hydraulic cylinder piston, and the lower end of the hydraulic booster device housing is also an integrally turned hydraulic cylinder piston. The piston at the lower end of the hydraulic booster device mandrel and the booster hydraulic cylinder housing are in a sealed fit, and the piston at the lower end of the hydraulic booster device housing and the hydraulic booster device mandrel are in a sealed fit. The two pistons plus the outer wall of the hydraulic booster device mandrel and the inner wall of the hydraulic booster device housing form an annular liquid cavity that generates an upward lifting force. The high-pressure fluid enters the annular liquid cavity through the flow channel hole of the hydraulic booster device mandrel, pushes the piston of the hydraulic booster device mandrel upward, and generates an upward lifting force.

[0006] The safety release device comprises a safety release device housing, a safety release device mandrel, a shear pin and a hard rubber ball seat. The safety release device housing is connected to the safety release device mandrel through the shear pin. The ball pitching ball seat is installed in the middle and upper part of the safety release device mandrel.

[0007] The rotary stop valve comprises a rotary stop valve housing, a rotary stop valve core shaft, a stabilizing spring and a track pin. The rotary stop valve core shaft has a spinning track, and the track pin is fixed on the rotary stop valve housing and installed in conjunction with the rotary stop valve core shaft. The stabilizing spring is installed on the upper step of the optional stop valve core shaft, which supports the rotary stop valve housing and keeps the rotary stop valve core shaft flow channel in an open state.

[0008] The seal is a component made of nitrile rubber material.

[0009] The stabilizing spring is a high-elasticity stainless steel spring component.

[0010] In summary, the present invention has the following gain effects:

[0011] 1. In the present invention, the hydraulic booster and the rotary stop valve interact with each other to provide sufficient lifting force for the lower fishing spear, thereby achieving the release of the stuck fish. The overall structure is simple, the design is reasonable, and the manufacturing and processing are easy.

[0012] 2. At present, there is no independent safety release device in the fish salvage process, which may cause secondary accidents when the release fails.

[0013] The present invention includes a safe hand-off device to avoid accident escalation when the card is unreadable, thus playing a certain protective role.

[0014] 3. At present, when using drilling tools to salvage fish in small casing pipes in horizontal wells and high-angle wells, there is a lack of a separately designed hydraulic force-enhancing release device, resulting in a low success rate of release. The present invention designs a hydraulic release device for small casings, selects higher strength materials and a more reasonable structural design, and solves the problem of high failure rate of salvaging fish in small casing pipes.

[0015] 4. There is a self-spinning track on the core shaft of the rotary stop valve, which can be locked by self-spinning by lifting the tool string to achieve the pressure holding function. This structure is simple, easy to operate, and can stably achieve pressure holding.

[0016] 5. The present invention combines the prior art and adds a hard rubber ball-throwing seat to the safety release device. Under special working conditions underground, when the pressure holding fails, the ball-throwing operation can ensure that the pressure holding is successful and the hydraulic booster device works normally.

[0017] 6. Because the pitching seat is made of hard rubber, under normal working pressure, continuing to increase the pressure will make the ball break through the pitching seat.

[0018] The pressure relief function is realized. There is a margin space designed at the lower end of the rotary stop valve core shaft, which can accommodate at least 5 balls.

[0019] 7. In the present invention, the outer shell piston and the core shaft, and the core shaft piston and the outer shell in the hydraulic booster device are not in direct contact, but are replaced by softer beryllium bronze. During the sliding process of the piston, the wear of the outer shell and the core shaft can be effectively reduced, and the service life of the tool can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, all the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some examples of the present invention. For ordinary and technical personnel in this field, other drawings can be obtained based on these drawings without any creative labor.

[0021] Figure 1 It is an overall schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the rotary stop valve when the flow channel is open in the present invention.

[0023] Figure 3 It is a schematic diagram of the rotary stop valve core shaft in the present invention.

[0024] Figure 4 It is a schematic diagram of the rotary stop valve core shaft in the present invention.

[0025] Figure 5 It is a cross-sectional schematic diagram of the rotary stop valve core axis B in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the rotary stop valve when the flow channel is closed in the present invention.

[0027] Figure 7 It is a structural schematic diagram of the hydraulic booster device in the present invention.

[0028] Figure 8 It is an enlarged schematic diagram of the hydraulic booster device A in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the safety release device.

[0030] Legend:

[0031] 1. Hydraulic booster device; 2. Safety release device; 3. Rotary stop valve; 101. Mandrel flow channel of hydraulic booster device;

[0032] 102, hydraulic booster mandrel; 103, hydraulic booster housing; 104, annular fluid cavity fluid inlet; 105, annular fluid cavity exhaust port; 106, beryllium bronze wear-resistant parts; 107, sealing ring; 108, limit step; 109, collision step; 110, hydraulic booster upper joint; 111, hydraulic booster lower joint; 112, mandrel piston; 113, housing piston; 201, safety release device mandrel; 202, pitching seat; 203, safety release device housing; 204, shear pin; 205, sealing ring; 206, lower joint of safety release device; 301, flow channel of rotary stop valve core shaft; 302, stabilizing spring; 303, rotary stop valve housing; 304, rotary stop valve core shaft; 305, sealing ring; 306, flow channel outlet; 307, ball recovery chamber; 308, pressure relief hole anti-blocking device; 309, pressure relief hole; 310, track pin; 311, spinning track; 312, upper joint of rotary stop valve; 312, lower joint of rotary stop valve. DETAILED DESCRIPTION

[0033] 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.

[0034] Example:

[0035] Reference Figure 1 The present invention provides an embodiment: a self-rotating locking hydraulic booster release device combination with a safety release device, which can be connected in sequence with a hydraulic booster device 1, a safety release device 2 and a rotary stop valve 3. Figure 2 , the upper joint 312 of the rotary stop valve is connected to the safety release device 206, and the lower joint 313 is connected to the salvage spear. The stabilizing spring 302 is installed in the gap between the rotary stop valve housing 303 and the upper part of the rotary stop valve core shaft 304. It is a pressure-bearing spring and mainly bears the weight of the rotary stop valve housing 303. One end of the track pin 310 is fixedly installed on the rotary stop valve housing 303, and the other end extends into the spin track 311 and slides in the spin track 311. The sealing ring 305 is arranged at the upper end of the rotary stop valve core shaft flow channel hole 306. On the rotary stop valve housing 303, the core shaft flow channel hole 306 is opened at the upper end of the ball recovery chamber 307. The pressure relief hole anti-blocking device 308 is located at the lower end of the core shaft 304. Its main function is to deposit impurities such as rust to prevent the pressure relief hole 309 from being blocked.

[0036] The specific operation is as follows: the tool is lowered into the well, at which time the weight of the rotary stop valve housing 303 and the salvage spear is borne by the stabilizing spring 302, the rotary stop valve core shaft 304 is at the bottom, the rotary stop valve core shaft flow channel hole 306 is in an open position, and the drilling fluid enters the rotary stop valve from the drill pipe through the anchor, hydraulic booster, and safety release device, and then flows out from the rotary stop valve core shaft flow channel hole 306 into the salvage spear, and then cleans the fish. After the ground confirms that the salvage spear has caught the fish, the tool string is lifted up, at which time the rotary stop valve housing 303 is rigidly connected to the salvage spear, and the salvage spear cannot move upward because it has caught the fish, so the rotary stop valve core shaft 304 slides upward relative to the rotary stop valve housing 303.

[0037] Reference Figure 3 At this time, the track pin 310 is located at the top of the spin track 311. Because the outer side of the track pin 310 is fixed on the rotary stop valve housing 303, the track pin 310 slides downward relative to the rotary stop valve core shaft 304 at this time. Under the action of the spin track, the rotary stop valve core shaft 304 is driven to rotate.

[0038] Reference Figure 4 The track pin 310 slides to the lower end of the spin track 311, which can clamp the rotary stop valve core shaft 304 and prevent it from sliding down, thereby causing the rotary stop valve core shaft flow channel hole 306 to reopen.

[0039] Reference Figure 6 , the rotary stop valve core shaft 304 slides to the uppermost end, at which time the rotary stop valve core shaft flow channel hole 306 is blocked, so that the entire flow channel forms a pressure-holding state, and under the action of the high-pressure fluid, the anchor and the hydraulic booster start to work. Figure 5 The pressure relief hole 309 is reasonably calculated to be equivalent to a throttle nozzle, which will not cause the cavity pressure to decrease when the tool is under pressure. When the jam is released or the jam fails, pressure relief is required. The tool only needs to be left still, and the pressure relief hole 309 will slowly release the pressure.

[0040] Referring to FIG. 7 , the hydraulic booster device is composed of four parts: an upper joint 110, a hydraulic booster device mandrel 102, a hydraulic booster device housing 103, and a lower joint 111. The hydraulic booster device mandrel 102 is installed inside the hydraulic booster device housing 103, and each level corresponds to each other. The upper joint 110 is connected to the anchor, and the lower joint 111 is connected to the safety release device. The high-pressure fluid on the ground enters the hydraulic booster device mandrel flow channel 101 through the drill pipe and the anchor, and then enters the annular liquid cavity through the annular liquid cavity fluid inlet 104. When the rotary stop valve 3 is successfully pressed, the high-pressure fluid first drives the anchor to work and anchor on the casing. The hydraulic booster device housing 103 is rigidly connected to the anchor and is also fixed at this time. Similarly, the housing piston 113 is also fixed. After the anchoring is completed, continue to pressurize, and the high-pressure fluid pushes the mandrel piston 112 to move upward, thereby driving the tool as a whole to move upward to achieve unblocking. When the core shaft piston 112 moves upward, the annular liquid cavity exhaust hole 105 exhausts the air in the annular liquid cavity to ensure that the unblocking process will not encounter any obstruction.

[0041] Reference Figure 8 , the hydraulic booster core shaft 102, the hydraulic booster housing 103, the core shaft piston 112 and the housing piston 113 form an annular liquid cavity. Beryllium bronze wear-resistant rings 106 and sealing rings 107 are sequentially arranged between the core shaft piston 112 and the hydraulic booster housing 103. Two beryllium bronze wear-resistant rings 106 are arranged on the left and right sides, and three sealing rings 107 are evenly distributed on the inner side. The annular liquid cavity fluid inlet 104 is arranged below the core shaft piston 112, and is formed by directly opening a hole on the hydraulic booster core shaft 102. The limiting step 108 is formed by integral turning and is arranged below the annular liquid cavity fluid inlet 104 of the lowest core shaft. The purpose is to prevent the annular liquid cavity from closing and high-pressure fluid from entering. The collision step 109 is arranged at the lower end of the core shaft piston and is integrally turned. The main purpose is to prevent the piston edge from directly colliding with the limiting step 108, forming an edge effect and reducing the service life.

[0042] Reference Fig. 9 , the safety release device mandrel 201 is connected to the lower joint 111 of the hydraulic booster device, and the hard rubber ball throwing seat 202 is installed inside the safety release device mandrel 201. The lower part of the safety release device mandrel 201 cooperates with the safety release device housing 203, but the two are not rigidly connected and cannot directly transmit the lifting force. The lifting force is transmitted by the shear pin 204. Three sealing rings 205 are arranged at the lower end of the safety release device mandrel 201, and three sealing rings are arranged at the lower joint 206 of the safety release device housing 203.

[0043] If the rotary stop valve 3 encounters a special working condition, the pressure holding fails, and the hydraulic booster 1 cannot work normally, the ground staff stops pressing, then throws the ball, and then presses again. The ball holder 202 and the ball cooperate with each other to ensure that the pressure inside the tool is successfully held and the jam is released smoothly. After the jam is released, it is only necessary to apply pressure above the specified working pressure to make the ball break through the hard rubber ball holder 202 and release the pressure successfully. A ball recovery chamber 307 is provided at the lower end of the rotary stop valve core shaft 304, which can recover multiple balls, and the tool can be reused without returning to the ground.

[0044] If the tool fails to be unstuck and cannot be withdrawn, the pressure is increased above the normal working pressure of the tool so that the lifting force generated by the hydraulic booster is greater than the shear force of the shear pin, thereby shearing the pin and letting go in time to avoid escalation of the accident. Finally, it should be noted that the above is only a preferred implementation case of the present invention and does not limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. At the same time, the number of components in this article is only for structural description. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-spinning locking hydraulic force release device combination with a safety release device, characterized in that: The invention comprises a hydraulic booster device (1), a safety release device (2) and a rotary stop valve (3) which are connected in sequence.

2. According to the self-spinning locking hydraulic force-increasing release device combination with a safety release device as described in claim 1, it is characterized in that: The rotary stop valve (3) comprises: a rotary stop valve housing (303), a rotary stop valve core shaft (304), a stabilizing spring (302), and a track pin (310); a spin track (311) is provided on the rotary stop valve core shaft (304); the outer end of the track pin (310) is fixed on the rotary stop valve housing (303), and the inner end slides in the spin track (311); when the rotary stop valve core shaft (304) slides upward, the rotary stop valve core shaft (304) is driven to spin and lock; the stabilizing spring (302) is installed between the rotary stop valve core shaft (304) and the rotary stop valve housing (303) and is used to bear the deadweight of the rotary stop valve housing (303) and the lower tool; a ball recovery chamber (307) is provided at the lower end of the rotary stop valve core shaft (304); a pressure relief hole (309) and a pressure relief hole anti-blocking device (308) are provided at the lower end of the rotary stop valve core shaft (304).

3. According to the self-spinning locking hydraulic force-increasing release device combination with a safety release device as described in claim 1, it is characterized in that: The safety release device (2) comprises a safety release device spindle (201), a safety release device shell (203), a shear pin (204) and a hard rubber ball pitching seat (202); the hard rubber ball pitching seat (202) is mounted on a limit step inside the safety release device spindle (201); the safety release device spindle (201) and the safety release device shell (203) are connected by a shear pin (204), and the shear pin bears the upward lifting force between the safety release device spindle (201) and the safety release device shell (203).

4. A self-spinning locking hydraulic force-increasing release device assembly with a safety release device as described in claim 1, characterized in that: The hydraulic booster (1) comprises a hydraulic booster mandrel (102), a hydraulic booster housing (103), a hydraulic booster mandrel piston (112) and a hydraulic booster housing piston (113); the hydraulic booster mandrel piston (112) and the hydraulic booster housing piston (113) are both integrally turned; the last stage of the hydraulic booster mandrel (102) has a limiting step (108) integrally turned, It is placed below the fluid inlet (104) of the lowermost annular cavity; the hydraulic booster core shaft (102) and the hydraulic booster housing (103) are not in direct contact, and beryllium bronze wear-resistant rings (106) and sealing rings (107) are arranged side by side between the hydraulic booster core shaft (102) and the hydraulic booster housing (103), and the friction between the hydraulic booster core shaft (102) and the hydraulic booster housing (103) is replaced by the beryllium bronze wear-resistant ring (106).

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