Fallout prevention device

Abstract

This invention belongs to the field of oilfield operation technology and discloses an anti-well-fall device, including a triggering mechanism, an execution mechanism, and a linkage mechanism. The triggering mechanism includes a trigger cylinder, a trigger piston assembly, and an air supply assembly. The trigger cylinder is installed in the blowout preventer (BOP), and the trigger piston assembly is movably inserted into the trigger cylinder and extends into the BOP against the coiled tubing. The trigger piston assembly actuates, and the air supply assembly selectively connects to the trigger cylinder. The execution mechanism includes a cylinder assembly, slip assemblies, multiple execution cylinders, and multiple execution piston assemblies. The coiled tubing passes through the cylinder assembly, the slip assemblies are sleeved outside the coiled tubing, the multiple execution cylinders are circumferentially arranged in the cylinder assembly, and the multiple execution piston assemblies are movably inserted into the multiple execution cylinders and connected to the slip assemblies respectively. The linkage mechanism connects the trigger cylinder and the execution cylinders. Compressed air controls the actuation of the execution piston assemblies, changing the inner diameter of the slip assemblies. This anti-well-fall device can activate in the event of coiled tubing breakage, improving the reliability of the anti-fall device.

Description

Technical Field

[0001] This invention relates to the field of oilfield operation technology, and in particular to a device for preventing well falls. Background Technology

[0002] Coiled tubing is a type of tubing made of low-carbon alloy steel, possessing excellent flexibility; it is also known as flexible tubing. Coiled tubing servicing equipment features pressurized operation and continuous descent, and offers advantages such as small equipment size, short operation cycle, and low operating costs. Currently, coiled tubing equipment is widely used in oilfield operations. However, the clamping blocks of the coiled tubing injection head may be damaged during operation, and problems such as untimely obstruction handling may occur during the lowering of the coiled tubing. These issues can cause the unsupported section (gap) between the injection head chain and the blowout preventer to break, leading to a coiled tubing accident that results in the tubing falling into the well.

[0003] The distance between the trigger end and the actuator end of the coiled tubing provided by the existing technology is relatively large, resulting in an excessively long anti-fall-off device, which increases the difficulty of installation and use of the equipment. At the same time, the transmission process between the trigger end and the actuator end of the coiled tubing is complex, which can lead to execution delays and make it difficult to guarantee reliability.

[0004] Therefore, there is an urgent need for a well-fall prevention device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-fall-off device that can act promptly when coiled tubing breaks, thereby improving the reliability of the anti-fall-off mechanism.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The well-fall prevention device includes: a triggering mechanism, an actuator, and a linkage mechanism;

[0008] The triggering mechanism includes a trigger cylinder, a trigger piston assembly, and an air supply assembly. The trigger cylinder is installed in the blowout preventer box. The trigger piston assembly is movably inserted into the trigger cylinder and extends into the blowout preventer box against the continuous oil pipe. When the trigger piston assembly moves, it drives the air supply assembly to selectively connect to the trigger cylinder. The air supply assembly is configured to provide compressed air to the trigger cylinder.

[0009] The actuator includes a cylinder assembly, a slip assembly, multiple actuator cylinders, and multiple actuator piston assemblies. The cylinder assembly is disposed between the blowout preventer and the wellhead. The coiled tubing extends downhole through the cylinder assembly. The slip assembly is located inside the cylinder assembly and sleeved outside the coiled tubing. The multiple actuator cylinders are evenly distributed circumferentially on the outer side of the cylinder assembly. The multiple actuator piston assemblies are movably inserted into the multiple actuator cylinders and extend into the cylinder assembly, respectively movably connected to the slip assembly.

[0010] The linkage mechanism connects the trigger cylinder and the actuation cylinder, and the compressed air can control the movement of the actuation piston assembly to change the inner diameter of the slip assembly.

[0011] As a preferred embodiment of the anti-dumping device provided by the present invention, the trigger piston assembly includes a trigger piston and a trigger piston rod, the trigger piston rod being coaxially fixed to the trigger piston, and the triggering mechanism further includes a trigger elastic element, the trigger elastic element being sandwiched between the inner wall of the end of the trigger cylinder away from the blowout preventer and the trigger piston, enabling the trigger piston rod to abut against the coiled tubing.

[0012] As a preferred embodiment of the anti-fall-in-well device provided by the present invention, the actuating piston assembly includes an actuating piston, an actuating piston rod, and a slip connecting rod. The actuating piston rod is coaxially fixed to the actuating piston, one end of the actuating piston rod extends into the cylinder assembly, and the two ends of the slip connecting rod are respectively hinged to the end of the actuating piston rod extending into the cylinder assembly and a part of the slip assembly.

[0013] The actuator piston is close to the cylinder assembly, the slip assembly gradually moves away from the actuator cylinder along the length of the continuous oil pipe, and the inner diameter of the slip assembly decreases.

[0014] The actuator piston moves away from the cylinder assembly, and the slip assembly gradually moves closer to the actuator cylinder along the length of the continuous oil pipe, with the inner diameter of the slip assembly increasing.

[0015] As a preferred embodiment of the anti-fall-in-well device provided by the present invention, an air inlet and an exhaust port are respectively provided at the relative positions of the peripheral side of the trigger cylinder, and the air supply component is connected to the air inlet.

[0016] An inner interface and an outer interface are provided at intervals along the length of the actuator cylinder. The inner interface and the outer interface are selectively connected to the exhaust port through the linkage mechanism. The actuator piston is located between the inner interface and the outer interface. The pressure difference between the inner interface and the outer interface can drive the actuator piston to move along the length of the actuator cylinder.

[0017] As a preferred embodiment of the well-fall prevention device provided by the present invention, a venting ring groove is provided around the periphery of the trigger piston, the trigger piston is close to the blowout preventer box along the length direction of the trigger cylinder, and the air inlet, the exhaust port and the venting ring groove are connected.

[0018] As a preferred embodiment of the anti-well-fall device provided by the present invention, the trigger piston assembly further includes a first sealing ring, a second sealing ring, and a third sealing ring. The first sealing ring, the second sealing ring, and the third sealing ring are spaced apart and arranged around the trigger piston along the length direction of the trigger piston. The first sealing ring and the second sealing ring are respectively disposed on both sides of the venting ring groove. When the trigger piston rod abuts against the continuous tubing, the third sealing ring and the second sealing ring are respectively located on both sides of the air inlet.

[0019] As a preferred embodiment of the anti-fall-in-well device provided by the present invention, the linkage mechanism includes a reversing valve and a venting valve. The reversing valve controls the venting valve to connect to the inner interface, and the outer interface to connect to the exhaust port; or, the reversing valve controls the venting valve to connect to the outer interface, and the inner interface to connect to the exhaust port.

[0020] As a preferred embodiment of the anti-fall-in-well device provided by the present invention, the actuator includes an actuator cylinder body, an actuator cylinder seat, and an actuator cylinder cover. The actuator cylinder seat is installed on the cylinder assembly, the actuator cylinder body is installed on the actuator cylinder seat, the actuator cylinder cover is fastened to the end of the actuator cylinder body away from the actuator cylinder seat, and the actuator piston is disposed in the actuator cylinder body.

[0021] A first buffer groove is formed on the side of the actuator cylinder seat facing the actuator piston, and a second buffer groove is formed on the side of the actuator cylinder head facing the actuator piston. The shapes of the first buffer groove and the second buffer groove are respectively matched to the shapes of the two ends of the actuator piston.

[0022] As a preferred embodiment of the anti-fall-in-well device provided by the present invention, the actuator further includes an actuating elastic element, which is sandwiched between the actuating cylinder seat and the actuating piston and is configured to push the actuating piston away from the actuating cylinder seat.

[0023] As a preferred embodiment of the anti-well-falling device provided by the present invention, the slip assembly includes a plurality of slips evenly arranged along the circumference of the coiled tubing, and each set of the actuator cylinder and the actuator piston assembly can respectively drive one of the slips to move along the length direction of the coiled tubing.

[0024] The cylinder assembly includes a cylinder body and a base. The base is disposed on the inner bottom of the cylinder body. The actuator cylinder is installed on the upper side of the cylinder body. The base has a guide hole that gradually moves away from the actuator cylinder along the length of the continuous oil pipe. The wall of the guide hole gradually approaches the central axis of the base. Multiple slips abut against the inner wall of the guide hole.

[0025] As the multiple slips gradually move away from the actuator cylinder along the length of the continuous oil pipe, the multiple slips move closer to each other until they come into contact with the continuous oil pipe.

[0026] The beneficial effects of this invention are:

[0027] The anti-drop device provided by this invention includes a triggering mechanism, an actuator, and a linkage mechanism. The triggering mechanism includes a trigger cylinder, a trigger piston assembly, and an air supply assembly. The trigger cylinder is mounted on the blowout preventer (BOP). The trigger piston assembly is movably inserted into the trigger cylinder and extends into the BOP against the coiled tubing. When the trigger piston assembly actuates, it causes the air supply assembly to selectively connect to the trigger cylinder, configured to supply compressed air to the trigger cylinder. In other words, when the coiled tubing breaks and falls, the coiled tubing's obstruction of the trigger piston assembly disappears, causing the trigger piston assembly to actuate, resulting in the air supply assembly selectively connecting to the trigger cylinder. The actuator includes a cylinder assembly, a slip assembly, multiple actuator cylinders, and multiple actuator piston assemblies. The cylinder assembly is located between the blowout preventer and the wellhead. The coiled tubing extends downhole through the cylinder assembly. The slip assembly is located inside the cylinder assembly and sleeved on the outside of the coiled tubing. The multiple actuator cylinders are evenly distributed circumferentially on the outer side of the cylinder assembly. The multiple actuator piston assemblies are correspondingly and movably inserted into the actuator cylinders and extend into the cylinder assembly, respectively movably connected to the slip assembly. The linkage mechanism connects the trigger cylinder and the actuator cylinder. Compressed air can control the movement of the actuator piston assembly to change the inner diameter of the slip assembly. That is, when the coiled tubing breaks and falls, compressed air can enter the actuator cylinder from the air supply assembly through the trigger cylinder and the linkage mechanism. The compressed air enters the actuator cylinder and then exerts pressure on the actuator piston assembly, causing it to move, which in turn drives the slip assembly to clamp the coiled tubing and prevent it from falling further. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the well-falling prevention device provided in an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 Enlarged view of the structure marked B in the middle;

[0031] Figure 3 yes Figure 1 Enlarged view of the structure marked C in the middle;

[0032] Figure 4 yes Figure 1 Sectional view along the AA direction.

[0033] In the picture:

[0034] 10. Blowout preventer; 20. Continuous tubing;

[0035] 100. Triggering mechanism; 110. Triggering cylinder; 111. Inlet port; 112. Exhaust port; 120. Triggering piston assembly; 121. Triggering piston; 122. Triggering piston rod; 123. Vent ring groove; 124. First sealing ring; 125. Second sealing ring; 126. Third sealing ring; 127. Pin; 130. Air supply assembly; 131. Air supply valve; 140. Triggering elastic element;

[0036] 200. Actuator; 210. Cylinder assembly; 211. Cylinder body; 212. Base; 220. Slip assembly; 230. Actuating cylinder; 231. Inner interface; 232. Outer interface; 233. Actuating cylinder body; 234. Actuating cylinder seat; 235. Actuating cylinder head; 236. First buffer groove; 237. Second buffer groove; 240. Actuating piston assembly; 241. Actuating piston; 242. Actuating piston rod; 243. Slip connecting rod; 250. Actuating elastic element;

[0037] 300. Linkage mechanism; 310. Directional control valve; 320. Vent valve. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] Figure 1 This diagram illustrates the structure of the well-fall prevention device provided in an embodiment of the present invention. Figure 2 Show Figure 1 Enlarged view of the structure marked B in the middle; Figure 3 Show Figure 1 Enlarged view of the structure marked C in the middle; Figure 4 Show Figure 1 Sectional view along the AA direction. (Refer to...) Figures 1-4This embodiment provides a well-fall prevention device. The device includes a triggering mechanism 100, an actuator 200, and a linkage mechanism 300. The triggering mechanism 100 is used to react promptly when the coiled tubing 20 breaks. The actuator 200 clamps the coiled tubing 20 after the triggering mechanism 100 has reacted, preventing it from continuing to fall and block the well. The linkage mechanism 300 connects the triggering mechanism 100 and the actuator 200, enabling their coordinated operation.

[0044] Specifically, refer to Figure 1 and Figure 2 The triggering mechanism 100 includes a trigger cylinder 110, a trigger piston assembly 120, an air supply assembly 130, and a trigger elastic element 140. The trigger cylinder 110 is mounted on the blowout preventer 10. The trigger piston assembly 120 is movably inserted into the trigger cylinder 110 and extends into the blowout preventer 10 against the continuous oil line 20. When the trigger piston assembly 120 is activated, it causes the air supply assembly 130 to selectively connect to the trigger cylinder 110. The air supply assembly 130 is configured to supply compressed air to the trigger cylinder 110. The trigger elastic element 140 is sandwiched between the inner wall of the end of the trigger cylinder 110 away from the blowout preventer 10 and a portion of the trigger piston assembly 120.

[0045] More specifically, the trigger piston assembly 120 includes a trigger piston 121 and a trigger piston rod 122. The trigger piston rod 122 is coaxially fixed to the trigger piston 121, and the trigger elastic element 140 is sandwiched between the inner wall of the end of the trigger cylinder 110 away from the blowout preventer 10 and the trigger piston 121, enabling the trigger piston rod 122 to abut against the continuous oil pipe 20.

[0046] More specifically, an air inlet 111 and an exhaust outlet 112 are respectively provided at relatively opposite positions on the periphery of the trigger cylinder 110, and the air supply assembly 130 is connected to the air inlet 111. A venting ring groove 123 is provided around the periphery of the trigger piston 121, and the trigger piston 121 is close to the blowout preventer 10 along the length direction of the trigger cylinder 110. The air inlet 111, the exhaust outlet 112 and the venting ring groove 123 are connected.

[0047] More specifically, the trigger piston assembly 120 further includes a first sealing ring 124, a second sealing ring 125, and a third sealing ring 126. The first sealing ring 124, the second sealing ring 125, and the third sealing ring 126 are spaced apart and arranged around the trigger piston 121 along the length direction of the trigger piston 121. The first sealing ring 124 and the second sealing ring 125 are respectively disposed on both sides of the venting ring groove 123. When the trigger piston rod 122 abuts against the continuous oil pipe 20, the third sealing ring 126 and the second sealing ring 125 are respectively located on both sides of the air inlet 111. The aforementioned first sealing ring 124, second sealing ring 125 and third sealing ring 126 can prevent compressed air from overflowing to other positions in the trigger cylinder 110, forming a thrust on the trigger piston assembly 120, interfering with the communication effect of the air inlet 111, the exhaust port 112 and the ventilation ring groove 123, causing the trigger mechanism 100 to fail to provide timely feedback when the continuous oil pipe 20 breaks and falls.

[0048] Continue to refer to Figure 2 The trigger cylinder 110 includes a trigger cylinder body, a trigger cylinder seat, and a trigger cylinder cover. The trigger cylinder seat is fixed to the side of the blowout preventer 10, the trigger cylinder body is connected to the trigger cylinder seat, and the trigger cylinder cover is fastened to the end of the trigger cylinder body away from the trigger cylinder seat. The trigger piston 121 is arranged in the trigger cylinder body, and the two ends of the trigger piston rod 122 pass through the trigger cylinder seat and the trigger cylinder cover, respectively.

[0049] Specifically, the trigger piston rod 122 has multiple pin holes extending through a portion of the trigger cylinder head. These pin holes are spaced apart along the length of the trigger piston rod 122, and their direction of opening is radial. Each pin hole is configured to accommodate a pin 127, which can be inserted into a preset positioning structure and any of the pin holes to position the trigger piston rod 122. This configuration allows the trigger piston rod 122 to be positioned at different locations. During normal lowering of the continuous tubing 20, the trigger piston rod 122 is pulled away from the blowout preventer 10 to its limit position and locked by the pins 127 to prevent the trigger piston rod 122 from contacting the continuous tubing 20 and hindering its normal lowering.

[0050] Optionally, in this embodiment, the gas supply component 130 can be a gas storage tank from the prior art, and the gas storage tank outlet is provided with a gas supply valve 131. The gas supply valve 131 is used to control the on / off state of the gas supply component 130 and the air inlet 111.

[0051] Reference Figure 1 and Figure 3The actuator 200 includes a cylinder assembly 210, a slip assembly 220, multiple actuator cylinders 230, and multiple actuator piston assemblies 240. The cylinder assembly 210 is disposed between the blowout preventer 10 and the wellhead. The coiled tubing 20 extends downhole through the cylinder assembly 210. The slip assembly 220 is located inside the cylinder assembly 210 and sleeved on the outside of the coiled tubing 20. The multiple actuator cylinders 230 are evenly distributed circumferentially on the outer side of the cylinder assembly 210. The multiple actuator piston assemblies 240 are movably inserted into the multiple actuator cylinders 230 and extend into the cylinder assembly 210, respectively, and are movably connected to the slip assembly 220. The slip assembly 220 can be actuated by the multiple actuator piston assemblies 240 to clamp or release the coiled tubing 20.

[0052] Specifically, the actuating piston assembly 240 includes an actuating piston 241, an actuating piston rod 242, and a slip connecting rod 243. The actuating piston rod 242 is coaxially fixed to the actuating piston 241, with one end extending into the cylinder assembly 210. The two ends of the slip connecting rod 243 are respectively hinged to the end of the actuating piston rod 242 extending into the cylinder assembly 210 and a portion of the slip assembly 220. The actuating piston 241 approaches the cylinder assembly 210, and the slip assembly 220 gradually moves away from the actuating cylinder 230 along the length of the continuous tubing 20, with its inner diameter decreasing. Conversely, the actuating piston 241 moves away from the cylinder assembly 210, and the slip assembly 220 gradually moves closer to the actuating cylinder 230 along the length of the continuous tubing 20, with its inner diameter increasing.

[0053] More specifically, the actuating cylinder 230 includes an actuating cylinder body 233, an actuating cylinder seat 234, and an actuating cylinder cover 235. The actuating cylinder seat 234 is mounted on the cylinder assembly 210, the actuating cylinder body 233 is mounted on the actuating cylinder seat 234, and the actuating cylinder cover 235 is fastened to the end of the actuating cylinder body 233 away from the actuating cylinder seat 234. The actuating piston 241 is disposed in the actuating cylinder body 233, and one end of the actuating piston rod 242 passes through the actuating cylinder seat 234 and extends into the cylinder assembly 210.

[0054] More specifically, the cylinder seat 234 has a first buffer groove 236 on one side of the piston 241, and the cylinder head 235 has a second buffer groove 237 on one side of the piston 241. The piston 241 has a first boss structure and a second boss structure at both ends. The first buffer groove 236 matches the shape of the first boss structure, and the two can be fitted with a clearance fit; the second buffer groove 237 matches the shape of the second boss structure, and the two can be fitted with a clearance fit. The first buffer groove 236 and the second buffer groove 237 can provide a buffering effect on the piston 241.

[0055] More specifically, an inner interface 231 and an outer interface 232 are spaced apart along the length of the actuating cylinder 230. The inner interface 231 and the outer interface 232 are selectively connected to the exhaust port 112 via the linkage mechanism 300. The actuating piston 241 is located between the inner interface 231 and the outer interface 232, and the pressure difference between the inner interface 231 and the outer interface 232 can drive the actuating piston 241 to move along the length of the actuating cylinder 230.

[0056] Preferably, the actuator 200 further includes an actuating elastic element 250, which is sandwiched between the actuating cylinder seat 234 and the actuating piston 241 and configured to push the actuating piston 241 away from the actuating cylinder seat 234. The actuating elastic element 250 serves a reset function; in its natural state, the actuating piston 241 is close to the actuating cylinder head 235, thereby causing the slip assembly 220 to lift and relax, preventing the slip assembly 220 from clamping the continuous oil pipe 20.

[0057] Reference Figure 1 and Figure 4 The slip assembly 220 includes a plurality of slips evenly arranged circumferentially along the continuous oil pipe 20. Each set of the actuator cylinder 230 and actuator piston assembly 240 can respectively drive one of the slips to move along the length direction of the continuous oil pipe 20. In this embodiment, four slips are specifically provided. The four slips surround to form an oil pipe receiving space, through which the continuous oil pipe 20 passes.

[0058] Specifically, the cylinder assembly 210 includes a cylinder body 211 and a base 212. The cylinder body 211 is disposed outside the wellhead of the oil well, and the base 212 is disposed on the inner bottom of the cylinder body 211. The actuator cylinder 230 is mounted on the upper side of the cylinder body 211. The base 212 has a guide hole that gradually moves away from the actuator cylinder 230 along the length of the coiled tubing 20. The wall of the guide hole gradually approaches the central axis of the base 212, and multiple slips abut against the inner wall of the guide hole. As the multiple slips gradually move away from the actuator cylinder 230 along the length of the coiled tubing 20, the multiple slips move closer to each other until they abut against the coiled tubing 20 and clamp it.

[0059] Reference Figure 1The linkage mechanism 300 is located between the trigger cylinder 110 and the actuating cylinder 230. The linkage mechanism 300 includes a reversing valve 310 and a vent valve 320. The reversing valve 310 controls the vent valve 320 to connect to the inner interface 231, and the outer interface 232 to connect to the exhaust interface 112; or, the reversing valve 310 controls the vent valve 320 to connect to the outer interface 232, and the inner interface 231 to connect to the exhaust interface 112. The linkage mechanism 300 delivers compressed air to different positions on the actuating cylinder 230, creating thrust in different directions on the actuating piston 241, thereby controlling the movement of the actuating piston assembly 240 to change the inner diameter of the slip assembly 220. The reversing valve 310 is a two-position four-way reversing valve, operated manually.

[0060] The working principle of the anti-fall-in-well device provided in this embodiment is as follows:

[0061] Controlled by the reversing valve 310, the outer interface 232 is connected to the exhaust interface 112, and the vent valve 320 is connected to the inner interface 231. At this time, the well-fall prevention device is in working condition. When the coiled tubing 20 breaks, the resistance of the coiled tubing 20 to the trigger piston rod 122 disappears. Under the push of the trigger elastic element 140, the trigger piston 121 gradually approaches the blowout preventer box 10 until the exhaust interface 112 is directly opposite the vent ring groove 123. At this time, the exhaust interface 112 is connected to the air inlet interface 111. Compressed air can then enter the actuator cylinder 230 from the outer interface 232, creating a thrust on the actuator piston 241. This causes the actuator piston 241 to move towards the cylinder assembly 210, thereby driving the slip connecting rod 243 to push the slip assembly 220 away from the blowout preventer box 10. Under the constraint of the inner wall shape of the guide through hole, the distance between the multiple slips gradually decreases until the coiled tubing 20 is clamped, preventing it from continuing to fall down the well.

[0062] By using the reversing valve 310 to switch the direction, the vent valve 320 is connected to the outer interface 232, and the inner interface 231 is connected to the exhaust interface 112. At this time, the well-fall prevention device is in a non-operating state. Compressed air can enter the actuator cylinder 230 from the inner interface 231, creating a thrust on the actuator piston 241, causing the actuator piston 241 to move away from the cylinder assembly 210. This drives the slip connecting rod 243 to pull the slip assembly 220 towards the blowout preventer box 10, gradually increasing the distance between the slips. Then, the trigger piston 121 is returned to its original position, restoring the well-fall prevention device to its original state.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fall protection device, characterized in that include: A triggering mechanism (100) includes a trigger cylinder (110), a trigger piston assembly (120), and an air supply assembly (130). The trigger cylinder (110) is mounted on a blowout preventer (10). The trigger piston assembly (120) is movably inserted into the trigger cylinder (110) and extends into the blowout preventer (10) against a continuous oil pipe (20). When the trigger piston assembly (120) is activated, it causes the air supply assembly (130) to selectively connect to the trigger cylinder (110). The air supply assembly (130) is configured to supply compressed air to the trigger cylinder (110). The actuator (200) includes a cylinder assembly (210), a slip assembly (220), multiple actuator cylinders (230), and multiple actuator piston assemblies (240). The cylinder assembly (210) is disposed between the blowout preventer (10) and the wellhead. The coiled tubing (20) extends downhole through the cylinder assembly (210). The slip assembly (220) is located inside the cylinder assembly (210) and sleeved outside the coiled tubing (20). The multiple actuator cylinders (230) are evenly arranged circumferentially on the outer side of the cylinder assembly (210). The multiple actuator piston assemblies (240) are movably inserted into the multiple actuator cylinders (230) and extend into the cylinder assembly (210), and are movably connected to the slip assembly (220). Linkage mechanism (300), which connects the trigger cylinder (110) and the execution cylinder (230), wherein the compressed air can control the action of the execution piston assembly (240) to change the inner diameter of the slip assembly (220); The trigger piston assembly (120) includes a trigger piston (121) and a trigger piston rod (122). The trigger piston rod (122) is coaxially fixed to the trigger piston (121). The triggering mechanism (100) also includes a trigger elastic element (140). The trigger elastic element (140) is sandwiched between the inner wall of the end of the trigger cylinder (110) away from the blowout preventer (10) and the trigger piston (121), enabling the trigger piston rod (122) to abut against the continuous oil pipe (20). The actuator piston assembly (240) includes an actuator piston (241), an actuator piston rod (242), and a slip connecting rod (243). An air intake port (111) and an exhaust port (112) are respectively opened at the relative positions of the peripheral side of the trigger cylinder (110), and the air supply assembly (130) is connected to the air intake port (111). An inner interface (231) and an outer interface (232) are provided at intervals along the length direction of the actuator cylinder (230). The inner interface (231) and the outer interface (232) are selectively connected to the exhaust port (112) through the linkage mechanism (300). The actuator piston (241) is located between the inner interface (231) and the outer interface (232). The pressure difference between the inner interface (231) and the outer interface (232) can drive the actuator piston (241) to move along the length direction of the actuator cylinder (230). The linkage mechanism (300) includes a reversing valve (310) and a vent valve (320). The reversing valve (310) controls the vent valve (320) to connect to the inner interface (231), and the outer interface (232) to connect to the exhaust interface (112); or, the reversing valve (310) controls the vent valve (320) to connect to the outer interface (232), and the inner interface (231) to connect to the exhaust interface (112).

2. The fall-protection device of claim 1, wherein, The actuator piston rod (242) is coaxially fixed to the actuator piston (241), one end of the actuator piston rod (242) extends into the cylinder assembly (210), and the two ends of the slip connecting rod (243) are respectively hinged to the end of the actuator piston rod (242) extending into the cylinder assembly (210) and a part of the slip assembly (220); The actuator piston (241) is close to the cylinder assembly (210), the slip assembly (220) gradually moves away from the actuator cylinder (230) along the length of the continuous oil pipe (20), and the inner diameter of the slip assembly (220) decreases; The actuator piston (241) is away from the cylinder assembly (210), the slip assembly (220) gradually approaches the actuator cylinder (230) along the length of the continuous oil pipe (20), and the inner diameter of the slip assembly (220) increases.

3. The fall-protection device of claim 2, wherein, A ventilation ring groove (123) is provided around the periphery of the trigger piston (121). The trigger piston (121) is close to the blowout preventer (10) along the length direction of the trigger cylinder (110). The air inlet (111), the exhaust port (112) and the ventilation ring groove (123) are connected.

4. The fall-protection device of claim 3, wherein, The trigger piston assembly (120) further includes a first sealing ring (124), a second sealing ring (125), and a third sealing ring (126). The first sealing ring (124), the second sealing ring (125), and the third sealing ring (126) are spaced around the trigger piston (121) along the length direction of the trigger piston (121). The first sealing ring (124) and the second sealing ring (125) are respectively located on both sides of the venting ring groove (123). When the trigger piston rod (122) abuts against the continuous oil pipe (20), the third sealing ring (126) and the second sealing ring (125) are respectively located on both sides of the air inlet (111).

5. The fall-protection device of claim 2, wherein, The actuator cylinder (230) includes an actuator cylinder body (233), an actuator cylinder seat (234), and an actuator cylinder cover (235). The actuator cylinder seat (234) is installed on the cylinder assembly (210), the actuator cylinder body (233) is installed on the actuator cylinder seat (234), and the actuator cylinder cover (235) is fastened to the end of the actuator cylinder body (233) away from the actuator cylinder seat (234). The actuator piston (241) is disposed in the actuator cylinder body (233). The actuator cylinder seat (234) has a first buffer groove (236) on the side facing the actuator piston (241), and the actuator cylinder head (235) has a second buffer groove (237) on the side facing the actuator piston (241). The shapes of the first buffer groove (236) and the second buffer groove (237) are respectively matched to the shapes of the two ends of the actuator piston (241).

6. The fall-protection device of claim 5, wherein, The actuator (200) further includes an actuating elastic element (250) sandwiched between the actuating cylinder seat (234) and the actuating piston (241), and configured to push the actuating piston (241) away from the actuating cylinder seat (234).

7. The fall-protection device of claim 1, wherein, The slip assembly (220) includes a plurality of slips evenly arranged circumferentially along the continuous oil pipe (20). Each set of the actuator cylinder (230) and the actuator piston assembly (240) can drive one of the slips to move along the length direction of the continuous oil pipe (20). The cylinder assembly (210) includes a cylinder body (211) and a base (212). The base (212) is disposed on the inner side of the bottom of the cylinder body (211). The actuator cylinder (230) is installed on the upper side of the cylinder body (211). The base (212) has a guide hole that gradually moves away from the actuator cylinder (230) along the length of the continuous oil pipe (20). The hole wall of the guide hole gradually approaches the central axis of the base (212). Multiple slips abut against the inner wall of the guide hole. As the multiple slips gradually move away from the actuator cylinder (230) along the length of the continuous oil pipe (20), the multiple slips move closer to each other until they come into contact with the continuous oil pipe (20).

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