Electrically-driven unmanned operation platform for minor repair at wellhead

Abstract

An electrically-driven unmanned operation platform comprises a wellhead substructure 1 arranged above the wellhead. The operation platform further comprises a centering mechanism 5, a first driving de

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of workover platforms, in particular to an electrically-driven unmanned operation platform for minor repair at a wellhead. BACKGROUND

[0002] In the traditional workover operation mode, pipe columns are lifted and lowered manually by means of the workover rig. The workers standing at the wellhead at the first post and the second post are responsible for hanging and removing objects on the elevator, and loading and unloading the buckles. The workers at the third post deliver, pick up tube robs, and put them in place. The site workers assist and complete other work on site. The whole process is high in labor intensity and very dangerous, and is likely to suffer from bumping and injury accidents.

[0003] In related technologies, in order to improve the above defects, mechanical equipment is usually used to replace manual operation. However, the existing mechanical equipment usually uses hydraulic pressure as the power source, and the hydraulic system is difficult to achieve accurate positioning and control. Moreover, in the hydraulic system, high-temperature hydraulic oil is easy to overflow in summer, resulting that the field working environment is polluted. The temperature is low in winter, and the fluidity of hydraulic oil is low, resulting in slow operation rate and low operation efficiency of the whole hydraulic system.

[0004] Based on this, a new technical solution is urgently needed to solve the above problems. SUMMARY

[0005] The present disclosure aims to provide an electrically-driven unmanned operation platform for minor repair at a wellhead so as to solve the problems in the prior art, and the electrically-driven unmanned operation platform for minor repair at a wellhead realizes accurate control and has high adaptability to the environment and high work efficiency.

[0006] In order to achieve the objectives, the present disclosure provides the following solution.

[0007] The present disclosure provides an electrically-driven unmanned operation platform for minor repair at a wellhead, including:

[0008] a wellhead substructure arranged above the wellhead and provided with an operation opening directly facing the wellhead; 15 05 25

[0009] a centering mechanism and a first driving device which are arranged on the wellhead substructure, where the centering mechanism is movably arranged on the wellhead substructure, and the first driving device drives the centering mechanism to move close to and away from an axis of the wellhead;

[0010] a righting mechanism and a second driving device which are arranged on the wellhead substructure, where the righting mechanism is movably arranged on the wellhead substructure, and the second driving device drives the righting mechanism to move close to and away from the axis of the wellhead;

[0011] an electric pipe rod clamp and a clamp feeding mechanism which are arranged on the wellhead substructure, where the electric pipe rod clamp is movably arranged on the wellhead substructure, and the clamp feeding mechanism drives the electric pipe rod clamp to move close to and away from the axis of the wellhead;

[0012] electric cylinders used as power sources of the clamp feeding mechanism, the second driving device and the first driving device; and

[0013] a controller controlling the centering mechanism, the first driving device, the second driving device, the electric pipe rod clamp and the clamp feeding mechanism to operate.

[0014] Preferably, the centering mechanism, the righting mechanism and the clamp feeding mechanism are provided with rotating swing frames respectively; a bottom of each of the rotating swing frames and a bottom of each of the electric cylinders are hinged to the wellhead substructure, a free end of each of the electric cylinders is hinged to one of the rotating swing frames, and each of the rotating swing frames is connected with several of the electric cylinders.

[0015] Preferably, each of the rotating swing frames or the electric cylinders is connected to a position identification component, a proximity switch matched with the position identification component is arranged on the wellhead substructure, the position identification component is driven to rotate along a first track when a corresponding one of the rotating swing frames or the electric cylinders swings, the proximity switch is arranged on one side of the first track, and the position identification component is identified by the proximity switch and identified signal is transmitted to the controller when the position identification component rotates to align with the proximity switch.

[0016] Preferably, the electrically-driven unmanned operation platform for minor repair at a wellhead further includes support plates fixedly arranged on the wellhead substructure, where a slot hole extending along a first arc is formed in each of the support plates, the first arc and the first track has a same radian, and the proximity switch is detachably connected to the slot hole. 15 05 25

[0017] Preferably, the electrically-driven unmanned operation platform for minor repair at a wellhead further includes a blowout prevention box, where the centering mechanism includes two buckling tiles, the two buckling tiles are detachably connected to two mounting portions respectively, the blowout prevention box is formed by splicing two separate boxes, the two separate boxes are detachably connected to the two mounting portions respectively, splicing ends of the two separate boxes are formed with semicircular notches respectively, and the two semicircular notches are spliced to form a round hole for pipe rods to penetrate.

[0018] Preferably, the electrically-driven unmanned operation platform for minor repair at a wellhead further includes a pipe rod cleaning device arranged at the wellhead and including an outer sleeve, a nozzle and a rubber core, where the outer sleeve is coaxially connected to the wellhead, the nozzle is arranged inside the outer sleeve and communicated with an external high-temperature steam source, the rubber core is in a sleeve shape and coaxially arranged inside the outer sleeve, and the nozzle is located below the rubber core.

[0019] Preferably, an other nozzle is arranged above the rubber core.

[0020] Compared with the prior art, the present disclosure has the following technical effects.

[0021] The electrically-driven unmanned operation platform for minor repair at a wellhead provided by the present disclosure abandons the traditional technical solution that the movement of each of components is driven by hydraulic cylinders and use the hydraulic cylinders more stable than the hydraulic cylinders to replace the hydraulic cylinders, so that the movement of components can be controlled accurately. The electrically-driven unmanned operation platform for minor repair at a wellhead is high in adaptability to the environment and in work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the present embodiments of the present disclosure or the technical solution in the prior art, the following briefly introduces the accompanying drawings to be used in the present embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those skilled in the art may still derive other drawings from these accompanying drawings without creative efforts.

[0023] FIG. 1 is a structural schematic diagram of an electrically-driven unmanned operation platform for minor repair at a wellhead according to an embodiment of the present disclosure;

[0024] FIG. 2 is a positional relationship schematic diagram of a righting mechanism, a clamp feeding mechanism, an electric pipe rod clamp, a centering mechanism, electric slips at a wellhead, a second driving device and a first driving device at a wellhead; 15 05 25

[0025] FIG. 3 is a structural schematic diagram of the righting mechanism;

[0026] FIG. 4 is a local enlarged view of FIG. 3;

[0027] FIG. 5 is a rear view of the righting mechanism of FIG. 3;

[0028] FIG. 6 is a local enlarged view of FIG. 5;

[0029] FIG. 7 is a structural schematic diagram of the centering mechanism;

[0030] FIG. 8 is a local enlarged view of FIG. 7;

[0031] FIG. 9 is a structural schematic diagram of the clamp feeding mechanism and the electric pipe rod clamp;

[0032] FIG. 10 is a local enlarged drawing of FIG. 9;

[0033] FIG. 11 is a structural schematic diagram of a pipe rod cleaning device according to an embodiment of the present disclosure; and

[0034] FIG. 12 is a section view of FIG. 11.

[0035] Reference numerals: 1, wellhead substructure; 2, righting mechanism; 3, clamp feeding mechanism; 4, electric pipe rod clamp; 5, centering mechanism; 6, electric slip at wellhead; 7, second driving device; 8, first driving device; 9, rotating swing frame; 10, buckling tile; 11, forked body; 12, support plate; 13, position identification component; 14, proximity switch; 15, slot hole; 16, outer sleeve; 17, upper flange; 18, lower flange; 19, rubber core; and 20, nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. Based on the embodiment in the present disclosure, all other embodiments acquired by those skilled in the art without creative efforts belong to the scope of the present disclosure.

[0037] The present disclosure aims to provide an electrically-driven unmanned operation platform for minor repair at a wellhead so as to solve the problems in the prior art, and the electrically-driven unmanned operation platform for minor repair at a wellhead realizes accurate control and has high adaptability to the environment and high work efficiency.

[0038] To make the foregoing objectives, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The present disclosure provides an electrically-driven unmanned operation platform for 15 05 25 minor repair at a wellhead, as shown in FIG. 1 to FIG. 2. The electrically-driven unmanned operation platform for minor repair at a wellhead includes a wellhead substructure 1, a centering mechanism 5, a first driving device 8, a righting mechanism 2, a second driving device 7, an electric pipe rod clamp 4, a clamp feeding mechanism 3 and a controller. The wellhead substructure 1 is arranged above the wellhead and formed with an operation opening directly facing the wellhead. The pipe rods are lifted and lowered through the operation opening. The centering mechanism 5 is movably arranged on the wellhead substructure 1, and the first driving device 8 can drive the centering mechanism 5 to move close to and away from an axis of the wellhead. The righting mechanism 2 is movably arranged on the wellhead substructure 1, and the second driving device 7 can drive the righting mechanism 2 to move close to and away from the axis of the wellhead. The electric pipe rod clamp 4 is movably arranged on the wellhead substructure 1, and the clamp feeding mechanism 3 can drive the electric pipe rod clamp 4 to move close to and away from the axis of the wellhead. The controller controls the centering mechanism 5, the first driving device 8, the second driving device 7, the electric pipe rod clamp 5 and the clamp feeding mechanism 3 to operate.

[0040] The power sources of the clamp feeding mechanism 3, the second driving device 7 and the first driving device 8 are electric cylinders. The electric pipe rod clamp 4 is also electricity driven to rotate. The controller is preferably arranged in a driller room.

[0041] The electrically-driven unmanned operation platform for minor repair at a wellhead provided by the present disclosure abandons the traditional technical solution that the movement of each of components is driven by hydraulic cylinders and uses the electric cylinders more stable than the hydraulic cylinders to replace the hydraulic cylinders, so that the movement of components can be controlled accurately. The electrically-driven unmanned operation platform for minor repair at a wellhead is high in adaptability to the environment and in work efficiency.

[0042] In some embodiments, as shown in FIG. 1, FIG. 3, FIG. 5, FIG. 7 and FIG. 9, the centering mechanism 5, the righting mechanism 2 and the clamp feeding mechanism 3 are provided with rotating swing frames 9 respectively. The bottom of the rotating swing frame 9 is hinged to the wellhead substructure 1. The bottom of the electric cylinder is hinged to the wellhead substructure 1. A free end of the electric cylinder is hinged to the rotating swing frame 9. Each of the rotating swing frames 9 is connected with several of the electric cylinders. The hinged structure can include lugs and a rotating shaft. The lugs are arranged in pairs. Both ends of the rotating shaft can be rotatably arranged in holes of the lugs about an axis of the rotating shaft. A cylinder body of the electric cylinder is fixedly or rotatably connected to the rotating shaft. The rotating swing frame 9 15 05 25 is fixedly or rotatably connected to the rotating shaft. A piston of the electric cylinder drives the rotating swing frame 9 to swing when the piston is reciprocated.

[0043] The three rotating swing frames 9 include a first rotating swing frame, a second rotating swing frame and a third rotating swing frame.

[0044] The centering mechanism 5 further includes two air cylinders and two buckling tiles 10 which are arranged on the first rotating swing frame. The two buckling tiles 10 are opposite and are slidable. The two air cylinders are configured for driving the two buckling tiles 10 to move close to and away from each other. When the two buckling tiles 5 move close to each other, the buckling tiles 10 clamp the coupling of a pipe rod at the wellhead so as to facilitate a screw thread of a pipe rod to be lowered into a wellhole butting with the coupling of the pipe rod at the wellhead (the buckling tiles 10 can be selected according to the thickness of the pipe rod).

[0045] The righting mechanism 2 includes a forked body 11 arranged on the second rotating swing frame, and the forked body 11 is configured for clamping the pipe rod so that the pipe rod can move with the forked body and be send to a designated position.

[0046] As shown in FIG. 1, and FIG. 4 to FIG. 10, in order to realize intelligent control, in some embodiments, the rotating swing frame 9 or the electric cylinder is arranged with a position identification component 13. The wellhead substructure 1 is arranged with a proximity switch 14 matched with the position identification component 13. The position identification component 13 is driven to rotate along a first track when the rotating swing frame 9 or the electric cylinder swings, that is, the first track is an arc track along which the position identification component 13 rotates. The proximity switch 14 is arranged on one side of the first track. The position identification component 13 can be identified by the proximity switch 14 and the identified signal is transmitted to the controller when the position identification component 13 rotates to directly face the proximity switch 14. Specifically, three positioning mechanisms are arranged. The positioning mechanism includes a position identification component 13 and a proximity switch 14 matched with the position identification component 13. The three positioning mechanisms correspond to centering, clamp feeding and righting processes respectively. The position identification component 13 of each of the three positioning mechanisms can be connected to the rotating swing frame 9 or the electric cylinder, so that the rotating swing frame 9 or the electric cylinder drives the position identification component 13 to move along a set track. When the position identification component moves to a preset position, that is, the position identification component aligns with the proximity switch 14, the position identification component can be detected by the proximity switch 14 and the detected signal is transmitted to the controller. 15 05 25

[0047] In order to realize the fixation of the proximity switch 14, in an embodiment of the present disclosure, a support plate 12 is fixedly arranged on the wellhead substructure 1. A slot hole 15 extending along a first arc is provided in the support plate 12. The first arc and the first track have a same radian. The proximity switch 14 is detachably connected to the slot hole 15.

[0048] In the embodiment, the position of the proximity switch 14 is convenient to be adjusted, so that the flexibility of the equipment is improved.

[0049] In some embodiments, the electrically-driven unmanned operation platform for minor repair at a wellhead in an embodiment of the present disclosure further includes a blowout prevention box. The centering mechanism 5 is provided with two buckling tiles 10. The two buckling tiles 10 are detachably connected to two mounting portions. The blowout prevention box is formed by splicing two separate boxes. The two separate boxes are detachably connected to the two mounting portions respectively. That is to say, one of the two buckling tiles 10 and one of the two separate boxes are connected to one of the two mounting portions while the other of the two buckling tiles 10 and the other of the two separate boxes are connected to the other of the two mounting portions, the one of the two buckling tiles 10 and the one of the two separate boxes have a invariant position relation while the other of the two buckling tiles 10 and the other of the two separate boxes have a invariant position relation, the two mounting portions move close to each other, so that the two buckling tiles 10 buckle to each other and the two separate boxes connect to each other to form the blowout prevention box to cover outside of the two buckling tiles 10. A splicing end of each of the two separate boxes is provided with a semicircular notch. The two semicircular notches are spliced together to form a round hole for pipe rods to penetrate.

[0050] When the pipe rod is lowered, the axis of the pipe rod at the wellhead is coaxial with the pipe rod in the well by means of a centering function of the centering mechanism 5. When the pipe rod is lifted, a blowout prevention function is realized by means of the blowout prevention box, and the blowout prevention box is buckled at the connecting portion connecting two pipe rods.

[0051] In some embodiments, as shown in FIG. 11 to FIG. 12, the electrically-driven unmanned operation platform for minor repair at a wellhead provided by an embodiment of the present disclosure further includes a pipe rod cleaning device. The pipe rod cleaning device is arranged at the wellhead. The pipe rod cleaning device includes an outer sleeve 16, a nozzle 20 and a rubber core 19. The outer sleeve 16 is coaxially connected to the wellhead. The nozzle 20 is arranged inside the outer sleeve 16 and communicated with an external high-temperature steam source. The rubber core 19 is in a sleeve shape and coaxially arranged inside the outer sleeve 16. The nozzle 20 is located below the rubber core 19. The rubber core 19 includes a plurality of annular cleaning 15 05 25 sheets. The cleaning sheets are arranged in sequence from top to bottom, and an interval is provided between adjacent cleaning sheets.

[0052] Specifically, an upper end of the outer sleeve 16 is connected to an electric chuck or a sand washing blowout preventer via an upper flange 17, and a lower end of the outer sleeve 16 is connected to the wellhead or the blowout preventer via a lower flange 18. The principle of the pipe rod cleaning device is that wax, crude oil and other mixtures on an outer wall of a tubing are melt and removed by means of the high-temperature steam.

[0053] In a preferred solution, another nozzle 20 is arranged above the rubber core 19.

[0054] In some embodiments, the wellhead substructure 1 is provided with a valve port to facilitate the recovery of waste liquid in the platform.

[0055] The specific operation process of the electrically-driven unmanned operation platform for minor repair at a wellhead is as follows.

[0056] In the process of lifting the pipe rod, an electric elevator is lowered below the coupling of the pipe rod. The electric elevator clamps the pipe rod and then is locked. The electric slips 6 at the wellhead are opened. The pipe rod is lifted to a proper position, and the electric slips are closed. The electric pipe rod clamp 4 moves forward to the wellhead. The upper and lower pipe rods are clamped to rotate and unscrew by means of the electric pipe rod clamp 4, and then the electric pipe rod clamp 4 returns back after unscrewing. The upper pipe rod is slightly lifted to separate the upper and lower pipe rods, and then the righting mechanism 2 moves forward to push the separated upper pipe rod onto a pipe rod conveyor. The righting mechanism 2 returns back. The electric elevator lowers the pipe rod to place flat on the conveyor and then is stopped. The elevator is opened and then lifted. The pipe rod is delivered to a pipe rack by the conveyor. The above actions are repeated.

[0057] In the process of lowering the pipe rod, the pipe rod is delivered to the wellhead by the conveyor, the elevator is lowered. The electric elevator clamps the pipe rod. After the pipe rod is lifted to a position, the righting mechanism 2 moves to the foremost position to prepare for receiving the pipe rod. The pipe rod is continued to be lifted to a proper height. At the same time, the centering mechanism 5 moves to the wellhead and the coupling of the pipe rod at the wellhead is held with the buckling tiles 10. At this time, the righting mechanism 2 returns back to the wellhead, the elevator is lowered, and the pipe rod is placed in the buckling tiles 10, so that a the screw thread of a pipe rod to be lowered into a wellhole is connected to the coupling of the pipe rod in the well. Then, the righting mechanism 2 and the centering mechanism 5 return back to initial positions thereof. The electric pipe rod clamp 4 moves forward to the wellhead. The upper and lower pipe rods are clamped to rotate and screw by means of the electric pipe rod clamp 4. The electric pipe rod clamp 4 returns back after screwing, and the electric elevator is opened. The elevator is lowered to a proper position. The electric slips are closed, the elevator is opened and then lifted. The above actions are repeated.

[0058] Specific examples are used for illustration of the principles and implementation methods of the present disclosure. The description of the above-mentioned embodiments is used to help illustrate the method and its core principles of the present disclosure. In addition, those skilled in the art can make various modifications in terms of specific embodiments and scope of application in accordance with the teachings of the present disclosure. In conclusion, the content of this specification shall not be construed as a limitation to the present disclosure. 15 05 25

Claims

15 05 251. An electrically-driven unmanned operation platform for minor repair at a wellhead, comprising:a wellhead substructure arranged above the wellhead and provided with an operation opening directly facing the wellhead;a centering mechanism and a first driving device which are arranged on the wellhead substructure, wherein the centering mechanism is movably arranged on the wellhead substructure, and the first driving device drives the centering mechanism to move close to and away from an axis of the wellhead;a righting mechanism and a second driving device which are arranged on the wellhead substructure, wherein the righting mechanism is movably arranged on the wellhead substructure, and the second driving device drives the righting mechanism to move close to and away from the axis of the wellhead;an electric pipe rod clamp and a clamp feeding mechanism which are arranged on the wellhead substructure, wherein the electric pipe rod clamp is movably arranged on the wellhead substructure, and the clamp feeding mechanism drives the electric pipe rod clamp to move close to and away from the axis of the wellhead;electric cylinders used as power sources of the clamp feeding mechanism, the second driving device and the first driving device; anda controller controlling the centering mechanism, the first driving device, the second driving device, the electric pipe rod clamp and the clamp feeding mechanism to operate;wherein the centering mechanism, the righting mechanism and the clamp feeding mechanism are provided with rotating swing frames respectively; a bottom of each of the rotating swing frames and a bottom of each of the electric cylinders are hinged to the wellhead substructure, a free end of each of the electric cylinders is hinged to one of the rotating swing frames, and each of the rotating swing frames is connected with several of the electric cylinders;each of the rotating swing frames or the electric cylinders is connected to a position identification component, a proximity switch matched with the position identification component is arranged on the wellhead substructure, the position identification component is driven to rotate along a first track when a corresponding one of the rotating swing frames or the electric cylinders swings, the proximity switch is arranged on one side of the first track, and the position identification component is identified by the proximity switch and identified signal is transmitted15 05 25to the controller when the position identification component rotates to align with the proximity switch.

2. The electrically-driven unmanned operation platform for minor repair at a wellhead according to claim 1, further comprising support plates fixedly arranged on the wellhead substructure, wherein a slot hole extending along a first arc is formed in each of the support plates, the first arc and the first track has a same radian, and the proximity switch is detachably connected to the slot hole.

3. The electrically-driven unmanned operation platform for minor repair at a wellhead according to claim 1, further comprising a blowout prevention box, wherein the centering mechanism comprises two buckling tiles, the two buckling tiles are detachably connected to two mounting portions respectively, the blowout prevention box is formed by splicing two separate boxes, the two separate boxes are detachably connected to the two mounting portions respectively, splicing ends of the two separate boxes are formed with semicircular notches respectively, and the two semicircular notches are spliced to form a round hole for pipe rods to penetrate.

4. The electrically-driven unmanned operation platform for minor repair at a wellhead according to claim 1, further comprising a pipe rod cleaning device arranged at the wellhead and comprising an outer sleeve, a nozzle and a rubber core, wherein the outer sleeve is coaxially connected to the wellhead, the nozzle is arranged inside the outer sleeve and communicated with an external high-temperature steam source, the rubber core is in a sleeve shape and coaxially arranged inside the outer sleeve, and the nozzle is located below the rubber core.

5. The electrically-driven unmanned operation platform for minor repair at a wellhead according to claim 4, wherein an other nozzle is arranged above the rubber core.

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