Pressure-operated work machine

Abstract

The present application discloses a pressure - operated work machine, belonging to the technical field of petrochemical industry. The high - pressure work machine includes a sealing assembly and a clamping mechanism. The sealing assembly is provided with a tubing passage through which the tubing can move. The clamping mechanism is used to clamp the tubing, and the clamping mechanism can drive the tubing to be lifted or lowered from the first end of the tubing passage. There is a pipeline separation and combination part between the sealing assembly and the clamping mechanism. When a pipeline cable is arranged on the surface of the tubing, the pipeline cable can be separated from or attached to the tubing at the pipeline separation and combination part. This solution can solve the problem that the pressure - operated work machine cannot be applied to the lifting or lowering of tubing with cables or pipelines.

Description

Technical Field

[0001] This application belongs to the technical field of petrochemical engineering, and particularly relates to a pressure workover rig. Background Art

[0002] With the annual popularization of the application of pressure workover technology, the application fields of pressure workover rigs are gradually expanding. Specifically, pressure workover rigs can be used for hoisting or lowering pipe strings under pressure, fishing under pressure, and milling under pressure, etc.

[0003] In related technologies, pressure workover rigs are mainly used for pipe strings without control cables or control pipelines on the surface of the pipe string. For pipe strings provided with downhole safety valves or electrical submersible pumps, the control cables or pipelines of the downhole safety valves or electrical submersible pumps are arranged along the pipe string on the surface of the pipe string. Since the pressure workover rigs in related technologies need to clamp the surface of the pipe string to hoist or lower the pipe string, it is easy to damage the cables or pipelines on the surface of the pipe string. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a pressure workover rig, which can solve the problem that the pressure workover rig in related technologies cannot be applied to hoisting or lowering pipe strings with cables or pipelines.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] A pressure workover rig for hoisting or lowering a pipe string includes a sealing assembly and a clamping mechanism. The sealing assembly is provided with a pipe string channel through which the pipe string can move. The clamping mechanism is used to clamp the pipe string, and the clamping mechanism can drive the pipe string to be hoisted or lowered from the first end of the pipe string channel;

[0007] There is a pipeline separation and combination part between the sealing assembly and the clamping mechanism.

[0008] When there are pipelines on the surface of the pipe string, the pipelines can be separated from or attached to the pipe string at the pipeline separation and combination part.

[0009] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0010] In the high-pressure operation machine disclosed in the embodiments of the present invention, the pipeline separation and combination part is located between the sealing component and the clamping mechanism, and the pipeline cable can be separated from or attached to the pipe column at the pipeline separation and combination part. During the process of lifting the pipe column, the pipeline cable installed on the surface of the pipe column can be separated from the pipe column at the pipeline separation and combination part and pass through the pipe column channel from the pipeline separation and combination part; during the process of lowering the pipe column, the pipeline cable is attached to the pipe column at the pipeline separation and combination part and enters the pipe column channel, and then is lowered together with the pipe column. The high-pressure operation machine described in this solution can make the surface of the pipe column at the clamping position of the clamping mechanism without pipeline cable during the process of lifting or lowering the pipe column, so as to avoid the pipeline cable being damaged by the clamping mechanism during the process of lifting or lowering the pipe column. It should be noted that the pipeline cable on the surface of the pipe column described in this application can be a control cable or a control pipeline installed on the surface of the pipe column. Therefore, the high-pressure operation machine described in this solution is applicable to the lifting or lowering of pipe columns with cables or pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0012] Figure 1 is a schematic diagram of a high-pressure operation machine disclosed in an embodiment of the present invention from a first perspective;

[0013] Figure 2 is Figure 1 a partial enlarged view of;

[0014] Figure 3 is a schematic diagram of a pipeline cable on the surface of a pipe column passing through the pipeline separation and combination part disclosed in an embodiment of the present invention;

[0015] Figure 4 is a schematic diagram of a sealing component disclosed in an embodiment of the present invention from a first perspective;

[0016] Figure 5 is a sectional schematic diagram of a sealing component disclosed in an embodiment of the present invention;

[0017] Figure 6 is Figure 5 a partial enlarged view of the first place in;

[0018] Figure 7 is Figure 5 a partial enlarged view of the second place in;

[0019] Figure 8 is a sectional schematic diagram of a piston disclosed in an embodiment of the present invention;

[0020] Figure 9 is a sectional schematic diagram of a connecting piece disclosed in an embodiment of the present invention;

[0021] Figure 10 It is a schematic cross-sectional view of a catheter disclosed in an embodiment of the present invention;

[0022] Figure 11 It is a schematic view of a filter ring in a first perspective disclosed in an embodiment of the present invention;

[0023] Figure 12 It is a schematic cross-sectional view of a filter ring disclosed in an embodiment of the present invention;

[0024] Figure 13 is Figure 12 the enlarged view of part A in

[0025] In the figure: 100 - pipe string; 110 - pipeline cable; 200 - sealing assembly; 210 - first blowout preventer; 220 - second blowout preventer; 230 - telescopic part; 231 - cylinder barrel; 2311 - first balance port; 2312 - second balance port; 2313 - first groove; 2314 - second groove; 232 - piston rod; 233 - piston; 2331 - first protrusion; 2332 - second protrusion; 234 - catheter; 2341 - positioning boss; 235 - filter ring; 2351 - filter hole; 236 - cylinder head; 240 - pipe string channel; 250 - connecting piece; 251 - positioning groove; 300 - clamping mechanism; 310 - first clamping assembly; 320 - second clamping assembly; 330 - first driving part; 340 - second driving part; 350 - support frame; 400 - pipeline splitting and combining part; 410 - connecting column. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Below in conjunction with Figures 1 to 13 , the technical solutions disclosed in each embodiment of the present invention will be described in detail.

[0028] Referring to Figures 1 to 3 , an embodiment of the present invention discloses a pressure control operation machine for hoisting or lowering a pipe string 100. Specifically, the pressure control operation machine includes a sealing assembly 200 and a clamping mechanism 300. Among them, the sealing assembly 200 is a basic structural member and can provide an installation basis for the clamping mechanism 300.

[0029] Referring to Figure 3 and Figure 5, the sealing assembly 200 is provided with a tubular column passage 240, and the tubular column 100 can move along the tubular column passage 240. The clamping mechanism 300 is used to clamp the tubular column 100, and the clamping mechanism 300 can drive the tubular column 100 to be lifted or lowered from the first end of the tubular column passage 240. There are many types of the clamping mechanism 300, such as: wedge clamping mechanism, screw clamping mechanism, eccentric clamping mechanism, hinge clamping mechanism, etc. Therefore, the specific type of the clamping mechanism 300 is not limited in this embodiment.

[0030] Referring to Figure 1 and Figure 2 , there is a pipeline separation and combination part 400 between the sealing assembly 200 and the clamping mechanism 300. When a pipeline cable 110 is arranged on the surface of the tubular column 100, the pipeline cable 110 can be separated from or attached to the tubular column 100 at the pipeline separation and combination part 400. Exemplarily, the pipeline separation and combination part 400 may be provided with an opening, and the opening may communicate with the tubular column passage 240 so that the pipeline cable 110 can pass through or penetrate into the tubular column passage 240 from the opening. Exemplarily, during the process of lifting the tubular column 100, the part of the tubular column 100 located in the well can pass through the sealing assembly 200 along the tubular column passage 240. When the pipeline cable 110 arranged on the surface of the tubular column 100 moves to the pipeline separation and combination part 400, the pipeline cable 110 on the surface of the tubular column 100 is separated from the tubular column 100. During the process of lowering the tubular column 100, the tubular column 100 and the pipeline cable 110 penetrate into the sealing assembly 200 along the tubular column passage 240. When the tubular column 100 moves to the pipeline separation and combination part 400, the pipeline cable 110 first adheres to the surface of the tubular column 100 so that the tubular column 100 and the pipeline cable 110 can enter the sealing assembly 200 along the tubular column passage 240 and reach the well.

[0031] Exemplarily, the pipeline separation and combination part 400 may be a gap provided between the sealing assembly 200 and the clamping mechanism 300, or an opening or passage formed by components between the sealing assembly 200 and the clamping mechanism 300, so that the pipeline cable 110 can run along the gap, opening or passage between the sealing assembly 200 and the clamping mechanism 300, and further enable the pipeline cable 110 to be separated from or attached to the surface of the tubular column 100.

[0032] There are many types of the pipeline cable 110, which may specifically be information transmission cables, power supply cables, gas transmission pipelines or liquid transmission pipelines, etc. Therefore, the specific type of the pipeline cable 110 is not limited in this embodiment.

[0033] During the process of using the high-pressure operation machine described in the above embodiments to lift the pipe string 100, the pipe cable 110 on the surface of the pipe string 100 can be separated from the pipe string 100 at the pipeline splitting and combining part 400, so that the pipe cable 110 can pass through from the pipeline splitting and combining part 400, avoiding the pipe cable 110 moving with the pipe string 100 to the clamping mechanism 300, and further avoiding the pipe cable 110 on the surface of the pipe string 100 being clamped and damaged by the clamping mechanism 300. During the process of using the high-pressure operation machine to lower the pipe string 100, the pipe cable 110 can enter the pipe column channel 240 from the pipeline splitting and combining part 400, and further enable the pipe cable 110 to be lowered together with the pipe string 100. Since the pipeline splitting and combining part 400 is located between the clamping mechanism 300 and the sealing assembly 200, it can further avoid the pipe cable 110 being clamped and damaged by the clamping mechanism 300. Therefore, the high-pressure operation machine described in the above embodiments can be used for lifting or lowering a pipe string 100 with control cables or pipelines on its surface. It should be noted that the high-pressure operation machine disclosed in the above embodiments can also be used for lifting or lowering a pipe string 100 without control cables or pipelines.

[0034] Referring to Figure 1 and Figure 2 , the clamping mechanism 300 includes a first clamping component 310, a second clamping component 320 and a limiting member. The first clamping component 310 and the second clamping component 320 are arranged on the sealing assembly 200 along the axial direction of the pipe column channel 240. The second clamping component 320 is located on the side of the first clamping component 310 away from the sealing assembly 200, so that the first clamping component 310 and the second clamping component 320 can respectively clamp different positions of the pipe string 100. The first clamping component 310 is movable relative to the sealing assembly 200 along the axial direction of the pipe column channel 240, so as to lift or lower the pipe string 100 by moving the first clamping component 310 away from or close to the sealing assembly 200.

[0035] Exemplarily, the first clamping component 310 can be switched between a first position and a second position. When the first clamping component 310 moves from the second position to the first position, the first clamping component 310 gradually approaches the second clamping component 320. When the first clamping component 310 moves from the first position to the second position, the first clamping component 310 gradually moves away from the second clamping component 320.

[0036] The steps of lifting the pipe string 100 may include the following:

[0037] Step 101, close the second clamping component 320 so that the second clamping component 320 can clamp and fix the pipe string 100.

[0038] Step 102, open the first clamping component 310;

[0039] Step 103: Control the first clamping assembly 310 to move to the second position, that is, control the first clamping assembly 310 to move in the direction close to the sealing assembly 200. Exemplarily, the first clamping assembly 310 can be controlled to move to the second position.

[0040] Step 104: Close the first clamping assembly 310 so that the first clamping assembly 310 can clamp and fix the pipe string 100;

[0041] Step 105: Open the second clamping assembly 320;

[0042] Step 106: Control the first clamping assembly 310 to move to the first position, that is, control the first clamping assembly 310 to move in the direction away from the sealing assembly 200. Optionally, control the first clamping assembly 310 to move to the first position.

[0043] The above steps can be performed multiple times to lift the pipe string 100.

[0044] Lowering the pipe string 100 may include the following steps:

[0045] Step 201: Close the second clamping assembly 320 so that the second clamping assembly 320 can clamp and fix the pipe string 100.

[0046] Step 202: Open the first clamping assembly 310;

[0047] Step 203: Control the first clamping assembly 310 to move to the first position, that is, control the first clamping assembly 310 to move in the direction away from the sealing assembly 200. Optionally, control the first clamping assembly 310 to move to the first position.

[0048] Step 204: Close the first clamping assembly 310 so that the first clamping assembly 310 can clamp and fix the pipe string 100;

[0049] Step 205: Open the second clamping assembly 320;

[0050] Step 206: Control the first clamping assembly 310 to move to the second position, that is, control the first clamping assembly 310 to move in the direction close to the sealing assembly 200. Optionally, control the first clamping assembly 310 to move to the second position.

[0051] The above steps can be performed multiple times to lower the pipe string 100.

[0052] It should be noted that the above embodiments only disclose an optional embodiment of lifting the pipe string 100 or lowering the pipe string 100. During actual operation, the order of each step can be adjusted as needed. Therefore, the above embodiments do not limit the operation steps of the pipe string 100 lifted or lowered by the high-pressure operation machine described in this application.

[0053] Exemplarily, the second clamping assembly 320 can move relative to the sealing assembly 200 along the axial direction of the tubular string channel 240. The limiting member is disposed on the second clamping assembly 320 and / or the sealing assembly 200, and the limiting member is used to limit the movement of the second clamping assembly 320 along the axial direction of the tubular string channel 240. In this embodiment, by controlling the movement of the second clamping assembly 320 along the axial direction of the tubular string channel 240, the distance between the second clamping assembly 320 and the sealing assembly 200 can be increased or decreased, so as to achieve the purpose of adjustable distance between the second clamping assembly 320 and the sealing assembly 200.

[0054] For the convenience of description, the above steps 101 to 106 are defined as a hoisting cycle; steps 201 to 206 are defined as a lowering cycle. The high-pressure operation machine described in the above embodiment can adjust the moving distance of the tubular string 100 within a single hoisting cycle or lowering cycle through the movement of the second clamping assembly 320. Moreover, the height of the high-pressure operation machine can also be adjusted by adjusting the position of the second clamping assembly 320. Exemplarily, when the working space of the pressure-bearing operation machine is limited, or when there is no need to hoist or lower the tubular string 100, the distance between the second clamping assembly 320 and the sealing assembly 200 can be reduced to lower the height of the high-pressure operation machine and reduce the occupied space of the pressure-bearing operation machine.

[0055] Exemplarily, when the second clamping assembly 320 moves relative to the sealing assembly 200 to a predetermined position, the movement of the second clamping assembly 320 along the axial direction of the tubular string channel 240 can be limited by the limiting member. Furthermore, the second clamping assembly 320 can clamp and fix the tubular string 100 to prevent the tubular string 100 from moving into the well when the first clamping assembly 310 is opened.

[0056] There are many structures of the limiting member. Exemplarily, the limiting member can be a pin, a brake, a chuck, etc. Therefore, the specific structure of the limiting member is not limited in this embodiment.

[0057] Refer to Figure 1 and Figure 2, the clamping mechanism 300 further includes a first driving member 330 and a second driving member 340. The first driving member 330 is connected to the first clamping assembly 310, and the first driving member 330 can drive the first clamping assembly 310 to move along the pipe string 100 in a direction approaching or departing from the second clamping assembly 320. The second driving member 340 is connected to the second clamping assembly 320, and the second driving member 340 can drive the second clamping assembly 320 to move along the pipe string 100 in a direction departing from or approaching the sealing assembly 200. There are many types of the first driving member 330 and the second driving member 340. For example, the first driving member 330 can be a hydraulic cylinder, a rack and pinion mechanism, a gear mechanism, a lead screw mechanism, etc. Therefore, the types of the first driving member 330 and the second driving member 340 are not limited in this embodiment. Exemplarily, the limiting member for limiting the movement of the second clamping assembly 320 along the axis direction of the pipe string channel 240 can be the second driving member 340. Specifically, when the second driving member 340 has a self-locking function, the self-locking function of the second driving member 340 can be further utilized to limit the position of the second clamping assembly 320 relative to the sealing assembly 200.

[0058] In an alternative embodiment, the number of the first driving members 330 can be at least two, and at least two first driving members 330 are arranged around the axis corresponding to the pipe string channel 240. Further, at least two first driving members 330 are evenly distributed around the axis corresponding to the pipe string channel 240, so that the first clamping assembly 310 is evenly stressed, and bending deformation of the first clamping assembly 310 caused by uneven stress can be avoided. Similarly, the number of the second driving members 340 can be at least two, and at least two second driving members 340 are arranged around the axis corresponding to the pipe string channel 240. Further, at least two second driving members 340 are evenly distributed around the axis corresponding to the pipe string channel 240, so that the second clamping assembly 320 is evenly stressed, and bending deformation of the second clamping assembly 320 caused by uneven stress can be avoided.

[0059] Refer to Figure 2, In an alternative embodiment, both the first clamping assembly 310 and the second clamping assembly 320 include at least one slip group, so that both the first clamping assembly 310 and the second clamping assembly 320 can clamp the pipe string 100 through the slip group. Optionally, the first clamping assembly 310 includes a first slip group and a second slip group, and the first slip group and the second slip group are arranged along the axial direction of the pipe string 100. Among them, the first slip group is used to overcome the acting force in the direction away from the bottom of the well of the pipe string 100, and the second slip group is used to overcome the gravity of the pipe string 100, so that the first clamping assembly 310 can provide acting forces in two directions, upward or downward along the pipe string 100. Further, the second clamping assembly 320 may include a third slip group and a fourth slip group, and the third slip group and the fourth slip group are arranged along the axial direction of the pipe string 100. Among them, the third slip group is used to overcome the acting force in the direction away from the bottom of the well of the pipe string 100, and the fourth slip group is used to overcome the gravity of the pipe string 100, so that the second clamping assembly 320 can provide acting forces in two directions, upward or downward along the pipe string 100.

[0060] Referring to Figure 1 , the clamping mechanism 300 further includes a support frame 350. The support frame 350 is a basic structural member and can provide an installation basis for the first driving member 330, the second driving member 340, the first clamping assembly 310 and / or the second clamping assembly 320. Optionally, the support frame 350 can be connected to the sealing assembly 200, and the first driving member 330 and the second driving member 340 can be arranged on the support frame 350. Referring to Figure 1 , the support frame 350 can be fixedly arranged on the sealing assembly 200, thereby providing support for the first driving member 330 and the second driving member 340. Specifically, the support frame 350 can be connected to the sealing assembly 200 by screws. The first driving member 330 and the second driving member 340 can be fixedly arranged on the support frame 350.

[0061] In an alternative embodiment, both the first driving member 330 and the second driving member 340 are telescopic oil cylinders, so as to drive the first clamping assembly 310 and the second clamping assembly 320 to move relative to the sealing assembly 200 along the axial direction of the pipe string 100 through the extension or shortening of the telescopic oil cylinders. Specifically, the first end of the first driving member 330 is connected to the first clamping assembly 310, and the second end of the first driving member 330 is connected to the support frame 350. The first end of the second driving member 340 is connected to the second clamping assembly 320, and the second end of the second driving member 340 is connected to the support frame 350.

[0062] In an alternative embodiment, the sealing assembly 200 can be sealingly engaged with the surface of the pipe string 100 to prevent liquid leakage from the pipeline splitting and combining section 400 and enable pressure operation. Specifically, the sealing assembly 200 can be provided with a sealing mechanism, such as a blowout preventer, to sealingly cooperate with the surface of the pipe string 100 through the blowout preventer. Refer to Figures 1 to 4 , the sealing assembly 200 can include a first blowout preventer 210, a second blowout preventer 220, and a telescopic portion 230. The first blowout preventer 210 is disposed at the first end of the telescopic portion 230, the second blowout preventer 220 is disposed at the second end of the telescopic portion 230, the first clamping assembly 310 is connected to the first blowout preventer 210 and / or the first end of the telescopic portion 230, and the first clamping assembly 310 can drive the telescopic portion 230 to extend or contract. When the first clamping assembly 310 closes and drives the pipe string 100 to move, the second clamping assembly 320 and the second blowout preventer 220 open, and the first blowout preventer 210 closes; when the first clamping assembly 310 opens and moves relative to the pipe string 100, the first blowout preventer 210 opens, and the second clamping assembly 320 and the second blowout preventer 220 close.

[0063] Lifting the pipe string 100 can include the following steps:

[0064] Step 301, close the second clamping assembly 320 so that the second clamping assembly 320 can clamp and fix the pipe string 100.

[0065] Step 302, close the second blowout preventer 220 to seal the surface of the second blowout preventer 220 with the pipe string 100;

[0066] Step 303, open the first clamping assembly 310;

[0067] Step 304, open the first blowout preventer 210 to prevent the pipe string 100 from being forcibly pulled out from the first blowout preventer 210.

[0068] Step 305, control the first driving member 330 to drive the first clamping assembly 310 to move to the second position, that is, drive the first clamping assembly 310 to move in a direction close to the sealing assembly 200 through the first driving member 330. Specifically, the first driving member 330 can be controlled to drive the first clamping assembly 310 to move to the second position.

[0069] Step 306, close the first clamping assembly 310 so that the first clamping assembly 310 can clamp and fix the pipe string 100;

[0070] Step 307, close the first blowout preventer 210 to seal the surface of the first blowout preventer 210 with the pipe string 100;

[0071] Step 308, open the second clamping assembly 320;

[0072] Step 309, open the second blowout preventer 220;

[0073] Step 3010, control the first driving member 330 to drive the first clamping assembly 310 to move to the first position, that is, drive the first clamping assembly 310 to move away from the sealing assembly 200 through the first driving member 330. Optionally, the first driving member 330 can be controlled to drive the first clamping assembly 310 to move to the first position.

[0074] The above steps can be performed multiple times to hoist the pipe string 100.

[0075] Lowering the pipe string 100 may include the following steps:

[0076] Step 401, close the second clamping assembly 320 so that the second clamping assembly 320 can clamp and fix the pipe string 100.

[0077] Step 402, close the second blowout preventer 220 to seal the surface of the second blowout preventer 220 and the pipe string 100;

[0078] Step 403, open the first clamping assembly 310;

[0079] Step 404, open the first blowout preventer 210 to prevent the pipe string 100 from being forcibly pulled out of the first blowout preventer 210.

[0080] Step 405, control the first driving member 330 to drive the first clamping assembly 310 to move to the first position. Specifically, the first driving member 330 can be controlled to drive the first clamping assembly 310 to move to the first position.

[0081] Step 406, close the first clamping assembly 310 so that the first clamping assembly 310 can clamp and fix the pipe string 100;

[0082] Step 407, close the first blowout preventer 210 to seal the surface of the first blowout preventer 210 and the pipe string 100;

[0083] Step 408, open the second clamping assembly 320;

[0084] Step 409, open the second blowout preventer 220;

[0085] Step 4010, control the first driving member 330 to drive the first clamping assembly 310 to move to the second position. Optionally, the first driving member 330 can be controlled to drive the first clamping assembly 310 to move to the second position.

[0086] The above steps can be performed multiple times to lower the pipe string 100.

[0087] It should be noted that the above embodiments only disclose an optional embodiment for lifting or lowering the pipe string 100. During actual operation, the order of each step can be adjusted as needed. Therefore, the above embodiments do not limit the operating steps of the high-pressure work machine for lifting or lowering the pipe string 100 described in this application.

[0088] The high-pressure work machine described in the above embodiments can alternately seal the pipe string 100 through the first blowout preventer 210 and the second blowout preventer 220, avoiding the pipe string 100 being forcibly pressed into or pulled out from within the first blowout preventer 210 and / or the second blowout preventer 220 during the process of lowering or lifting the pipe string 100, thereby achieving the purpose of protecting the first blowout preventer 210 and the second blowout preventer 220 in the high-pressure work machine.

[0089] Refer to Figure 1 and Figure 2 , the pipeline separation and combination part 400 is provided with at least two connecting columns 410. The connecting columns 410 are arranged at intervals around the pipe string 100, and the first end of the connecting column 410 is connected to the first clamping assembly 310, and the second end of the connecting column 410 is connected to the first blowout preventer 210. Specifically, the pipeline 110 can pass through or penetrate into the gap between the connecting columns 410, thereby realizing the separation or fitting of the pipeline 110 and the pipe string 100.

[0090] Exemplarily, the connecting columns 410 can be evenly distributed along the circumferential direction of the pipe string 100 to ensure uniform force on the first blowout preventer 210 and the first clamping assembly 310.

[0091] Refer to Figures 3 to 7 , the telescopic part 230 can include a cylinder barrel 231, a piston rod 232, a piston 233, and a conduit 234. The conduit 234 is arranged inside the cylinder barrel 231, and the first end of the conduit 234 is connected to the first end of the cylinder barrel 231. The piston rod 232 and the piston 233 are both located inside the cylinder barrel 231, and the piston rod 232 and the piston 233 are both sleeved on the conduit 234. The piston 233 is in sealing cooperation with the conduit 234, and the piston 233 is in sealing cooperation with the inner wall of the cylinder barrel 231. Exemplarily, the piston 233 can be in sealing cooperation with the outer side of the conduit 234. The first end of the piston rod 232 is connected to the piston 233, the second end of the piston rod 232 is connected to the first blowout preventer 210 and / or the first clamping assembly 310, and the piston rod 232 can drive the piston 233 to slide along the cylinder barrel 231. Exemplarily, the piston 233 can be in sliding seal with the conduit 234 and the cylinder barrel 231. In an optional embodiment, sealing grooves are provided on both the outer side wall and the inner side wall of the piston 233, and sealing rings are arranged in the sealing grooves to realize sliding seals of the piston 233 with the conduit 234 and the cylinder barrel 231 respectively through the sealing rings.

[0092] In the above embodiments, a clearance seal is achieved between the cylinder barrel 231 and the piston rod 232 through the piston 233, thereby avoiding liquid leakage. The second end of the piston rod 232 is connected to the first blowout preventer 210 and / or the first clamping assembly 310, so that the first clamping assembly 310 can drive the first blowout preventer 210 to move synchronously. Thus, during the process of the first clamping assembly 310 driving the pipe string 100 to move, the surface of the pipe string 100 can be sealed by the first blowout preventer 210, preventing the pipe string 100 from being forcibly pulled out or pressed into the first blowout preventer 210. The conduit 234 can reduce the pressure on the piston 233, which can not only ensure the sealing performance between the piston 233 and the cylinder barrel 231, but also extend the service life of the piston 233.

[0093] In an alternative embodiment, the support frame 350 can be connected to the cylinder barrel 231. Referring to Figure 1 and Figure 4 , the cylinder barrel 231 is provided with a boss, and the support frame 350 can be fixedly arranged on the boss. The support frame 350 is fixedly connected to the cylinder barrel 231, enabling the first driving member 330 to drive the first clamping assembly 310 and using the first clamping assembly 310 to drive the piston rod 232 to move.

[0094] In an alternative embodiment, the piston 233 is in sealing fit with the surface of the conduit 234 to prevent the well fluid from flowing out along the gap between the piston rod 232 and the conduit 234. Further, the gap between the piston rod 232 and the conduit 234 communicates with the pipe string passage 240 to balance the pressure in the gap between the piston rod 232 and the conduit 234. Specifically, during the extension of the telescopic part 230, the liquid or gas in the gap between the piston rod 232 and the conduit 234 can enter the pipe string passage 240. During the shortening of the telescopic part 230, the liquid or gas can enter the gap between the piston rod 232 and the conduit 234 from the pipe string passage 240.

[0095] In an alternative embodiment, a first balance port 2311 is provided at the first end of the cylinder barrel 231, and the gap between the conduit 234 and the cylinder barrel 231 communicates with the first balance port 2311. A second balance port 2312 is provided at the second end of the cylinder barrel 231, and the gap between the piston rod 232 and the cylinder barrel 231 communicates with the second balance port 2312.

[0096] In the above embodiments, by providing the first balance port 2311, during the extension or retraction of the telescopic part 230, the pressure in the gap between the conduit 234 and the cylinder 231 can be balanced through the first balance port 2311. Specifically, during the extension of the telescopic part 230, the gas or liquid in the gap between the conduit 234 and the cylinder 231 can be discharged from the first balance port 2311. During the retraction of the telescopic part 230, the liquid or gas can enter the gap between the conduit 234 and the cylinder 231 from the first balance port 2311. Similarly, during the extension or retraction of the telescopic part 230, the second balance port 2312 can balance the pressure in the gap between the piston rod 232 and the cylinder 231.

[0097] In an alternative embodiment, the telescopic part 230 further includes a pressure - adding pipe and a pressure - relieving pipe. The pressure - adding pipe is connected to the second balance port 2312 to add high - pressure liquid or gas into the gap between the piston rod 232 and the cylinder 231 through the pressure - adding pipe. The pressure - relieving pipe is connected to the first balance port 2311 to discharge the liquid or gas in the gap between the conduit 234 and the cylinder 231 through the pressure - relieving pipe. Specifically, the pressure - adding pipe can be connected to an air pump or a hydraulic pump to provide high - pressure gas or liquid through the air pump or the hydraulic pump.

[0098] In the above embodiments, by adding high - pressure liquid or gas into the gap between the piston rod 232 and the cylinder 231, the high - pressure liquid or gas in the gap between the piston rod 232 and the cylinder 231 can be used to balance the high pressure in the well, and the driving force of the first driving member 330 for driving the first clamping assembly 310 can be reduced. By using the pressure - relieving pipe to discharge the liquid or gas in the gap between the conduit 234 and the cylinder 231, the formation of high pressure or negative pressure in the gap between the conduit 234 and the cylinder 231 can be avoided, which is convenient for the piston rod 232 and the piston 233 to slide in the cylinder 231.

[0099] Referring to Figures 5 to 8 , in an alternative embodiment, a first protrusion 2331 is provided on one side of the first end of the piston 233 close to the cylinder 231, a first groove 2313 is provided at the first end of the cylinder 231, and the first balance port 2311 communicates with the side wall or the bottom of the first groove 2313. When the piston 233 moves to the first end of the cylinder 231, the first protrusion 2331 can be at least partially embedded in the first groove 2313; when the piston 233 moves to the second end of the cylinder 231, the first protrusion 2331 is separated from the first groove 2313.

[0100] In the above embodiments, when the piston 233 moves towards the first end of the cylinder barrel 231 and the first protrusion 2331 is at least partially embedded in the first groove 2313, the rate of the liquid or gas flowing out from the first balance port 2311 in the gap between the cylinder barrel 231 and the conduit 234 decreases, thereby increasing the resistance of the piston 233 moving towards the first end of the cylinder barrel 231, so as to play a buffering role, that is, a damping structure is formed at the first end of the piston 233 towards the cylinder barrel 231, reducing the impact force between the piston 233 and the first end of the cylinder barrel 231, achieving the purpose of protecting the piston 233 and the cylinder barrel 231.

[0101] Referring to Figures 5 to 8 , in an alternative embodiment, a second protrusion 2332 is provided on one side of the piston 233 close to the second end of the cylinder barrel 231, a second groove 2314 is provided at the second end of the cylinder barrel 231, and the second balance port 2312 communicates with the side wall or the bottom of the second groove 2314; when the piston 233 moves to the second end of the cylinder barrel 231, the second protrusion 2332 can be at least partially embedded in the second groove 2314, and when the piston 233 moves to the first end of the cylinder barrel 231, the second protrusion 2332 is separated from the second groove 2314.

[0102] In the above embodiments, when the piston 233 moves towards the second end of the cylinder barrel 231 and the second protrusion 2332 is at least partially embedded in the second groove 2314, the rate of the liquid or gas flowing out from the second balance port 2312 in the gap between the cylinder barrel 231 and the piston rod 232 decreases, thereby increasing the resistance of the piston 233 moving towards the second end of the cylinder barrel 231, so as to play a buffering role, that is, a damping structure is formed at the second end of the piston 233 towards the cylinder barrel 231, reducing the impact force between the piston 233 and the second end of the cylinder barrel 231, achieving the purpose of protecting the piston 233 and the cylinder barrel 231.

[0103] Referring to Figures 5 to 8 , the first protrusion 2331 can be an annular protrusion, and the first groove 2313 is an annular groove. Specifically, both the annular protrusion and the annular groove can surround the conduit 234. Further, the number of the first balance ports 2311 can be at least two, and each first balance port 2311 can be distributed along the circumferential direction of the annular groove. The first protrusion 2331 and the first groove 2313 are arranged in an annular shape, which can improve the stability of the first protrusion 2331 and prevent the first protrusion 2331 from being bent.

[0104] Of course, there are many shapes of the first protrusion 2331, such as: conical, cylindrical, arc-shaped, etc. Therefore, the specific shape of the first protrusion 2331 is not limited in this embodiment.

[0105] Referring to Figure 7, the first groove 2313 can be an annular gap between the conduit 234 and the cylinder barrel 231. The first protrusion 2331 can be an annular protrusion that fits against the surface of the conduit 234, and thus the conduit 234 can be utilized to provide support for the first protrusion 2331 to prevent the first protrusion 2331 from bending and deforming, thereby ensuring the stability of the first protrusion 2331.

[0106] Referring to Figures 5 to 8 , the second protrusion 2332 can be an annular protrusion, and the second groove 2314 can be an annular groove. Specifically, both the annular protrusion and the annular groove can surround the conduit 234. Further, the number of the second balance ports 2312 can be at least two, and the second balance ports 2312 can be circumferentially distributed along the annular groove. The second protrusion 2332 and the second groove 2314 are arranged in an annular shape, which can improve the stability of the second protrusion 2332 and prevent the first protrusion 2331 from bending.

[0107] Of course, there are many shapes for the second protrusion 2332, such as: conical, cylindrical, arc-shaped, etc. Therefore, the specific shape of the second protrusion 2332 is not limited in this embodiment.

[0108] Referring to Figure 6 and Figure 7 , the telescopic part 230 further includes a cylinder head 236, and the cylinder head 236 is arranged at the second end of the cylinder barrel 231 and is connected to the second end of the cylinder barrel 231. Optionally, the cylinder head 236 includes an embedding part, and the embedding part can be at least partially embedded into the gap between the cylinder barrel 231 and the piston rod 232. Further, the cylinder head 236 can be in sealing cooperation with the cylinder barrel 231. There are many ways for the cylinder head 236 to be in sealing cooperation with the cylinder barrel 231. For example, it can be sealed through a sealing ring. The structure of the sealing cooperation between the cylinder head 236 and the cylinder barrel 231 is not limited in this embodiment.

[0109] Referring to Figure 6 , in an alternative embodiment, the second groove 2314 can be an annular gap between the cylinder head 236 and the piston rod 232. The second protrusion 2332 can be an annular protrusion that fits against the surface of the piston rod 232, and thus the piston rod 232 can be utilized to provide support for the second protrusion 2332 to prevent the second protrusion 2332 from bending and deforming, ensuring the stability of the second protrusion 2332.

[0110] Referring to Figure 5 , Figure 7 , Figure 9 and Figure 10, the sealing assembly 200 may further include a connecting member 250. The connecting member 250 is connected to the first end of the cylinder barrel 231. A positioning groove 251 is provided at the end of the connecting member 250 connected to the cylinder barrel 231. A positioning boss 2341 is provided at the end of the conduit 234 connected to the cylinder barrel 231. The positioning boss 2341 is at least partially embedded in the positioning groove 251, and the outer surface of the positioning boss 2341 abuts against the groove wall of the positioning groove 251 for limiting. Specifically, the conduit 234 can abut against the end face of the first end of the cylinder barrel 231 through the positioning boss 2341 to realize the positioning of the conduit 234 in the axial direction. The positioning boss 2341 is at least partially embedded in the positioning groove 251, so that the outer surface of the positioning boss 2341 abuts against the groove wall of the positioning groove 251 for limiting, thereby ensuring that the conduit 234 can be coaxial with the cylinder barrel 231. Specifically, the connecting member 250 can be a connecting flange.

[0111] In an alternative embodiment, the positioning groove 251 can also be provided on the end face of the first end of the cylinder barrel 231, or both the end face of the first end of the cylinder barrel 231 and the connecting member 250 are provided with the positioning groove 251. Therefore, the present application does not limit the positioning groove 251 to be provided on the connecting member 250.

[0112] In the above embodiment, only by connecting the connecting member 250 with the cylinder barrel 231 can the positioning and installation of the conduit 234 be realized, which can not only improve the assembly accuracy of the conduit 234 and the cylinder barrel 231, but also reduce the installation difficulty of the conduit 234.

[0113] Referring to Figures 11 to 13 , the telescopic part 230 may further include a filter ring 235. The filter ring 235 is provided at the second end of the conduit 234. Specifically, the filter ring 235 can be fixedly connected to the second end of the conduit 234 by screws. Optionally, the outer diameter of the filter ring 235 is larger than the outer diameter of the conduit 234. The filter ring 235 is provided with filter holes 2351, and the filter holes 2351 communicate with the gap between the conduit 234 and the piston rod 232, so that the filter holes 2351 can be used to balance the pressure in the gap between the conduit 234 and the piston rod 232, so as to avoid the formation of negative pressure or high pressure in the gap between the conduit 234 and the piston rod 232 and reduce the resistance of the telescopic part 230 to extend or contract. In addition, the filter ring 235 can also prevent the particulate matter in the well from entering the gap between the conduit 234 and the piston rod 232, so as to avoid the particulate matter from affecting the sealing performance between the piston 233 and the conduit 234.

[0114] Referring to Figure 13 , the first end of the filter hole 2351 is the end close to the gap between the conduit 234 and the piston rod 232, the second end of the filter hole 2351 is the end far from the gap between the conduit 234 and the piston rod 232, and the caliber of the first end of the filter hole 2351 is larger than the caliber of the second end of the filter hole 2351.

[0115] In the above embodiments, the diameter of the first end of the filtering hole 2351 is larger than that of the second end of the filtering hole 2351. This can not only prevent larger particulate matters in the well from entering the gap between the conduit 234 and the piston rod 232, but also facilitate the discharge of the particulate matters in the gap between the conduit 234 and the piston rod 232.

[0116] In an alternative embodiment, the number of the filtering holes 2351 is multiple, and the filtering holes 2351 are distributed around the axis of the filtering ring 235 on the filtering ring 235. Specifically, the filtering holes 2351 can be evenly distributed around the axis of the filtering ring 235 to facilitate the discharge of the particulate matters in the gap between the conduit 234 and the piston rod 232.

[0117] In the above embodiments of the present invention, the differences between the embodiments are mainly described. As long as the different optimized features between the embodiments are not contradictory, they can be combined to form a more optimal embodiment. For the sake of brevity, they will not be elaborated here.

[0118] The above descriptions are only for the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A pressure - operated work machine, characterized in that, the pressure - operated work machine is used for hoisting or lowering a pipe string (100), and the pressure - operated work machine includes a sealing assembly (200) and a clamping mechanism (300). The sealing assembly (200) is provided with a pipe string channel (240), the pipe string (100) can move along the pipe string channel (240), the clamping mechanism (300) is used for clamping the pipe string (100), and the clamping mechanism (300) can drive the pipe string (100) to be hoisted or lowered from the first end of the pipe string channel (240); the sealing assembly (200) includes a telescopic part (230), a first blowout preventer (210) and a second blowout preventer (220), and the clamping mechanism (300) includes a first clamping assembly (310). There is a pipeline separation and combination part (400) between the sealing assembly (200) and the clamping mechanism (300), the pipeline separation and combination part (400) is provided with a connecting column (410), the first end of the connecting column (410) is connected to the first clamping assembly (310), and the second end of the connecting column (410) is connected to the first blowout preventer (210). When a pipeline cable (110) is arranged on the surface of the pipe string (100), the pipeline cable (110) can be separated from or attached to the pipe string (100) at the pipeline separation and combination part (400). The telescopic part (230) includes a cylinder barrel (231), a piston rod (232), a piston (233), a conduit (234) and a filter ring (235), the conduit (234) is arranged in the cylinder barrel (231), and the first end of the conduit (234) is connected to the first end of the cylinder barrel (231). Both the piston rod (232) and the piston (233) are located in the cylinder barrel (231), and both the piston rod (232) and the piston (233) are sleeved on the conduit (234), the piston (233) is in sealing cooperation with the conduit (234), the piston (233) is in sealing cooperation with the inner wall of the cylinder barrel (231), the first end of the piston rod (232) is connected to the piston (233), the second end of the piston rod (232) is connected to the first blowout preventer (210), and the piston rod (232) can drive the piston (233) to slide along the cylinder barrel (231). The filter ring (235) is arranged at the second end of the conduit (234), and the outer diameter of the filter ring (235) is larger than the outer diameter of the conduit (234), the filter ring (235) is provided with filter holes (2351), and the filter holes (2351) are communicated with the gap between the conduit (234) and the piston rod (232), so that the gap between the piston rod (232) and the conduit (234) is communicated with the pipe string channel (240) to balance the pressure in the gap between the piston rod (232) and the conduit (234). The first end of the filtering hole (2351) is the end close to the gap between the conduit (234) and the piston rod (232), the second end of the filtering hole (2351) is the end far from the gap between the conduit (234) and the piston rod (232), and the caliber of the first end of the filtering hole (2351) is larger than that of the second end of the filtering hole (2351).

2. The pressure workover rig according to claim 1, wherein, the clamping mechanism (300) further includes a second clamping assembly (320) and a limiting member, the first clamping assembly (310) and the second clamping assembly (320) are arranged on the sealing assembly (200) along the axial direction of the pipe string channel (240), and the second clamping assembly (320) is located on the side of the first clamping assembly (310) far from the sealing assembly (200), the first clamping assembly (310) and the second clamping assembly (320) are movable relative to the sealing assembly (200) along the axial direction of the pipe string channel (240), the limiting member is arranged on the second clamping assembly (320) and / or the sealing assembly (200), and the limiting member is used to limit the movement of the second clamping assembly (320) along the axial direction of the pipe string channel (240).

3. The pressure workover rig according to claim 2, wherein, the clamping mechanism (300) further includes a first driving member (330) and a second driving member (340), the first driving member (330) is connected to the first clamping assembly (310), and the first driving member (330) can drive the first clamping assembly (310) to move along the pipe string (100) towards or away from the second clamping assembly (320); the second driving member (340) is connected to the second clamping assembly (320), and the second driving member (340) can drive the second clamping assembly (320) to move along the pipe string (100) towards or away from the sealing assembly (200).

4. The pressure workover rig according to claim 3, wherein, the clamping mechanism (300) further includes a support frame (350), the support frame (350) is connected to the sealing assembly (200), and the first driving member (330) and the second driving member (340) are arranged on the support frame (350).

5. The pressure workover rig according to claim 2, wherein, the first blowout preventer (210) is arranged at the second end of the telescopic part (230), the second blowout preventer (220) is arranged at the first end of the telescopic part (230), the first clamping assembly (310) is connected to the first blowout preventer (210) and / or the first end of the telescopic part (230), and the first clamping assembly (310) can drive the telescopic part (230) to extend or contract; When the first clamping assembly (310) closes and drives the pipe string (100) to move, the second clamping assembly (320) and the second blowout preventer (220) open, and the first blowout preventer (210) closes. When the first clamping assembly (310) opens and moves relative to the pipe string (100), the first blowout preventer (210) opens, and the second clamping assembly (320) and the second blowout preventer (220) close.

6. The pressure workover rig according to claim 5, characterized in that a first balance port (2311) is provided at the first end of the cylinder barrel (231), and the gap between the conduit (234) and the cylinder barrel (231) communicates with the first balance port (2311); a second balance port (2312) is provided at the second end of the cylinder barrel (231), and the gap between the piston rod (232) and the cylinder barrel (231) communicates with the second balance port (2312).

7. The pressure workover rig according to claim 6, characterized in that the telescopic part (230) further includes a pressure supply pipe and a pressure relief pipe, the pressure supply pipe is connected to the second balance port (2312) to add high-pressure liquid or gas into the gap between the piston rod (232) and the cylinder barrel (231) through the pressure supply pipe; the pressure relief pipe is connected to the first balance port (2311) to discharge the liquid or gas in the gap between the conduit (234) and the cylinder barrel (231) through the pressure relief pipe.

8. The pressure workover rig according to claim 7, characterized in that a first protrusion (2331) is provided on one side of the piston (233) close to the first end of the cylinder barrel (231), a first groove (2313) is provided at the first end of the cylinder barrel (231), and the first balance port (2311) is located on the side wall of the first groove (2313); when the piston (233) moves to the first end of the cylinder barrel (231), the first protrusion (2331) is at least partially embedded in the first groove (2313); when the piston (233) moves to the second end of the cylinder barrel (231), the first protrusion (2331) is separated from the first groove (2313).

9. The pressure workover rig according to claim 8, characterized in that the first protrusion (2331) is an annular protrusion, and the first groove (2313) is an annular groove.

10. The pressure workover rig according to claim 7, characterized in that On one side of the piston (233) close to the second end of the cylinder barrel (231), a second protrusion (2332) is provided. A second groove (2314) is provided at the second end of the cylinder barrel (231). The second balance port (2312) is located on the side wall of the second groove (2314). When the piston (233) moves to the second end of the cylinder barrel (231), the second protrusion (2332) is at least partially embedded in the second groove (2314). When the piston (233) moves to the first end of the cylinder barrel (231), the second protrusion (2332) is separated from the second groove (2314).

11. The pressure - operated machine according to claim 10, characterized in that, the second protrusion (2332) is an annular protrusion, and the second groove (2314) is an annular groove.

12. The pressure - operated machine according to claim 7, characterized in that, On one side of the piston (233) close to the first end of the cylinder barrel (231), a first protrusion (2331) is provided. A first groove (2313) is provided at the first end of the cylinder barrel (231). The first balance port (2311) is located on the side wall of the first groove (2313). When the piston (233) moves to the first end of the cylinder barrel (231), the first protrusion (2331) is at least partially embedded in the first groove (2313). When the piston (233) moves to the second end of the cylinder barrel (231), the first protrusion (2331) is separated from the first groove (2313); On one side of the piston (233) close to the second end of the cylinder barrel (231), a second protrusion (2332) is provided. A second groove (2314) is provided at the second end of the cylinder barrel (231). The second balance port (2312) is located on the side wall of the second groove (2314). When the piston (233) moves to the second end of the cylinder barrel (231), the second protrusion (2332) is at least partially embedded in the second groove (2314). When the piston (233) moves to the first end of the cylinder barrel (231), the second protrusion (2332) is separated from the second groove (2314).

13. The pressure - operated machine according to claim 12, characterized in that, the first protrusion (2331) is an annular protrusion, the first groove (2313) is an annular groove; the second protrusion (2332) is an annular protrusion, and the second groove (2314) is an annular groove.

14. The pressure - operated machine according to claim 5, characterized in that, The sealing assembly (200) further includes a connecting member (250). The connecting member (250) is connected to the first end of the cylinder barrel (231). A positioning groove (251) is provided at the end of the connecting member (250) connected to the cylinder barrel (231) and / or at the first end of the cylinder barrel (231). One end of the catheter (234) connected to the cylinder (231) is provided with a positioning boss (2341), at least part of the positioning boss (2341) is embedded in the positioning groove, and the outer surface of the positioning boss (2341) abuts against the groove wall of the positioning groove (251) for limiting.

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