Gas well under-pressure operation machine

Abstract

The invention discloses a gas well under-pressure operation machine, which relates to the technical field of under-pressure operation equipment, and comprises a lower working flashboard blowout preventer, a balance pressure relief system, an upper working flashboard blowout preventer, a lower platform, an annular blowout preventer, a first upright post, a fixed slip group, an upper platform, a mast, a turntable and a platform ladder stand which are skid-mounted into a whole, on one hand, the overturning pedal is arranged on the upper platform, the platform crawling ladder is arranged below the overturning pedal, the flashboard overhauling fence is arranged below the lower platform, and the overhauling fence crawling ladder is arranged, so that an operator reaches the lower platform from the inner side of the operation machine through the platform crawling ladder and can reach the flashboard overhauling fence through the overhauling fence crawling ladder; on the one hand, equipment is overhauled and maintained from the interior of the platform, the problems that maintenance and overhaul of a blowout preventer set and a fixed slip set are inconvenient, and potential safety hazards exist in operation are solved, on the other hand, a slip shell has a certain moving space through a strip-shaped hole, the position of a slip is automatically adjusted to adapt to a pipe column, impact is reduced, and the service life is prolonged. And the service life of parts in the fixed slip group is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure - operated workover equipment, and more specifically to a pressure - operated workover machine for gas wells. Background Art

[0002] The pressure - operated workover machine mainly includes a main unit and a blowout preventer group. The main unit is used to overcome the gravity or upward force of the pipe string in the well, and the blowout preventer group and the plugging tool in the pipe string are used to control the well pressure. Using the pressure - operated workover machine for construction can realize the operation of pulling out and running in or rotating the pipe string under the condition of wellhead pressure.

[0003] During the pressure - operated workover construction, operators need to regularly inspect and maintain the equipment. For the construction of high - pressure gas wells, special attention should be paid to regularly checking the vulnerable parts in the core components such as slips and blowout preventers to prevent work stoppage caused by the damage of vulnerable parts during construction. The existing technical solutions can realize the maintenance and repair of components such as the movable slip group and the rotary table on the upper platform, but for the maintenance and repair of the blowout preventer group and the fixed slip group, operators need to climb down the outer ladder of the platform to reach the lower platform for maintenance, which takes a long time, is inconvenient to operate, and there is a risk of personnel falling.

[0004] In the prior art, a Chinese invention patent document with the publication number CN116220564A and the publication date of June 6, 2023 is proposed. This invention discloses a modular pressure - operated workover machine, which includes a working window device, a lifting device, a traveling device, an upper platform device, a mast device, a lower platform device, and a platform ladder. The working window device includes columns, a lower window plate, an upper window plate, and a fixed slip mechanism; the lifting device includes a lifting oil cylinder and a bottom plate assembly and a top plate assembly arranged on the lifting oil cylinder; the traveling device includes a traveling window plate arranged at the top output end of the lifting oil cylinder, a rotating mechanism arranged on the traveling window plate, and a traveling slip mechanism arranged at the power output end of the rotating mechanism; the mast device includes a mast main body and a support mechanism arranged on the mast main body; the lower platform device is detachably arranged outside the working window device; the platform ladder is arranged between the upper platform device and the lower platform device; this modular pressure - operated workover machine adopts a modular split structure, which can well meet the special working environment with limited lifting weight and transportation size.

[0005] However, when the above - mentioned technology is used, on the one hand, for the maintenance and repair of the blowout preventer, operators need to climb down the outer ladder of the platform to reach below the lower platform for maintenance, which takes a long time, is inconvenient to operate, and there is a risk of personnel falling. On the other hand, its slip mechanism is prone to component damage during long - term continuous use, reducing the service life of the components, increasing the downtime for repair, increasing the safety risk, and reducing the working efficiency of the entire operation. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a pressure - operated work machine for gas wells, which can solve the problems of inconvenient maintenance and repair of the blowout preventer group and the fixed slip group, potential safety hazards in operation, reduce the wear of related parts such as the slip group, and extend the service life.

[0007] The present invention is realized by adopting the following technical solutions: A pressure - operated work machine for gas wells includes a lower working ram blowout preventer integrated into a skid, a balanced pressure relief system, an upper working ram blowout preventer, a lower platform, an annular blowout preventer, a first column, a fixed slip group, an upper platform, a mast, a rotary table, and a platform ladder. Among them, the fixed slip group is arranged above the lower platform and includes an upper fixing plate, a second column, a lower fixing plate, and a number of slips. The second column is fixed between the upper fixing plate and the lower fixing plate by bolts. Bolt holes are provided on both the upper fixing plate and the lower fixing plate. Each slip includes a slip housing, slip teeth, a rocker arm, an oil cylinder, and a switching mechanism. The output end of the oil cylinder is connected to the switching mechanism. A pin with lower mechanical performance than the switching mechanism is arranged between the rocker arm and the switching mechanism. The oil cylinder drives the switching mechanism to drive the rocker arm and the slip teeth to act, thereby realizing the opening and closing of the slip. A strip - shaped hole is provided on the slip housing. The slip housing is fixed to the upper fixing plate or the lower fixing plate through a connecting bolt passing through the bolt hole and the strip - shaped hole, so that the slip housing can move horizontally along the strip - shaped hole after being fixed in the axial direction. A spacer is also arranged between the connecting bolt and the slip housing. The connecting bolt is also wrapped with a cylinder in the strip - shaped hole. The spacer is fixedly connected to the cylinder, effectively ensuring the limitation of the slip while meeting the requirement of the slip having an appropriate amount of movement space. A lock block is also sleeved outside the connecting bolt, and the lock block is fixed to the spacer by a lock pin. The upper platform and the lower platform are respectively arranged at the top and bottom of the first column. The upper platform is provided with a flip - up pedal. The platform ladder is arranged below the flip - up pedal. A ram maintenance railing is arranged below the lower platform, and a maintenance railing ladder is provided on the ram maintenance railing. Operators can reach the lower platform from the inside of the work machine through the platform ladder and can reach the ram maintenance railing through the maintenance railing ladder to realize the maintenance and repair of the equipment from inside the platform.

[0008] The upper platform includes an upper basic platform, on which a telescopic oil cylinder hydraulic tong boom, a winch control console, and a main control console are fixedly installed. A winch maintenance railing is also suspended and installed on the upper basic platform. During operation, operators can quickly reach the winch maintenance railing to repair winch I and winch II.

[0009] The upper basic platform is also fitted with an upper telescopic platform. During operation, the upper telescopic platform extends to increase the operation space, and during transportation, the platform retracts to meet the transportation requirements.

[0010] A cage ladder is installed beside the upper telescopic platform, and an inclined support is provided at the bottom of the upper telescopic platform to meet the installation requirements of the cage ladder.

[0011] The upper basic platform is also provided with an escape rope suspension device and an escape pedal. The escape rope suspension device can be quickly installed near each operator on the upper platform and provides a suspension point for the wire rope escape device. When carrying out construction operations, the escape pedal is opened to the horizontal state to provide a standing platform for the operators. During transportation, the escape pedal retracts to the vertical state and is retracted into the guardrail to meet the transportation requirements.

[0012] The lower platform includes a lower basic platform, and the lower basic platform is fitted with a lower telescopic platform. During operation, the lower telescopic platform extends to increase the operation space, and during transportation, the platform retracts to meet the transportation requirements.

[0013] A wire rope support device is installed above the flip pedal on the upper platform.

[0014] The turntable includes a turntable base plate, a turntable gear, and a slip. The top output end of the lifting oil cylinder is provided under the rotating base plate, so that the turntable is lifted and lowered by the lifting oil cylinder. The turntable is also provided with a driving motor, which drives through power and cooperates with the slip to drive the pipe string to rotate for operation to meet the workover operation processes such as pressure drilling, cutting, and sand washing.

[0015] The lower working ram preventer and the upper working ram preventer are arranged below the lower platform. The balance pressure relief system is arranged between the lower working ram preventer and the upper working ram preventer. The annular preventer is above the lower platform. The balance pressure relief system includes a four-way joint, a balance system, and a blowout prevention system. The four-way joint is installed between the lower working ram preventer and the upper working ram preventer, and at the same time provides installation positions for the balance system and the blowout prevention system. Through the balance system, the well pressure is balanced to the upper end of the ram of the lower working ram preventer. Through the blowout prevention system, the pressure in the four-way joint is blown out to meet the requirement that the pressures on both sides of the ram are the same when the lower working ram preventer and the upper working ram preventer are opened.

[0016] A mast hydraulic tong boom is fixedly installed on the mast.

[0017] Compared with the prior art, the beneficial effects of the present invention are shown in: 1. In the present invention, a pin is arranged between the rocker arm and the switch mechanism. The pin is made of a material with significantly lower mechanical properties relative to the switch mechanism, so that the pin is set as a weak component to play a role in protecting the switch mechanism. More beneficially, the pin can be set as a taper pin structure. After the pin is sheared, the damaged pin can be quickly taken out from the small end to meet the requirement of rapid maintenance.

[0018] 2. In the present invention, the slip housing has a certain degree of movement space through the strip-shaped holes, enabling the slips to automatically adjust their positions to adapt to the pipe string, reducing impact, and extending the service life of components such as the switching mechanism and pins.

[0019] 3. In the present invention, a flip pedal is provided on the upper platform, a platform ladder is arranged below the flip pedal, a ram repair railing is arranged below the lower platform, and a repair railing ladder is provided on the ram repair railing. Operators can reach the lower platform from the inside of the workover rig through the platform ladder and can reach the ram repair railing through the repair railing ladder, realizing the maintenance and repair of the equipment from inside the platform, solving the problems of inconvenient maintenance and repair of the blowout preventer group and the fixed slip group, long time consumption, inconvenient operation, and the risk of personnel falling.

[0020] 4. In the present invention, the upper platform and the lower platform are both provided with corresponding telescopic platforms, which extend during operation to increase the working space and reduce potential safety hazards at the same time.

[0021] 5. In the present invention, an escape rope suspension device and an escape pedal are provided to provide further safety protection for the personnel performing construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the drawings of the specification and specific embodiments, where: Figure 1 is a schematic side view of the structure of the workover rig for gas wells under pressure; Figure 2 is a schematic front view of the structure of the workover rig for gas wells under pressure; Figure 3 is a schematic top view of the structure of the workover rig for gas wells under pressure; Figure 4 is a schematic diagram of the structure of the fixed slip group; Figure 5 is a schematic diagram of the structure of the turntable; Figure 6 is a schematic diagram of the structure of the slips; Figure 7 is a three-dimensional schematic diagram of the structure of the slips; Figure 8 is Figure 6 the enlarged view of area I in

[0023] Markings in the figure: 1. Lower working ram preventer, 2. Balance pressure relief system, 2-1. Four-way joint, 2-2. Balance system, 2-3. Blowout prevention system, 3. Upper working ram preventer, 4. Lower platform, 4-1. Lower telescopic platform, 4-2. Lower basic platform, 5. Annular preventer, 6. First column, 7. Fixed slip group, 7-1. Upper fixing plate, 7-2. Second column, 7-3. Lower fixing plate, 7-4. Slip, 7-4-1. Slip housing, 7-4-2. Slip teeth, 7-4-3. Rocker arm, 7-4-4. Locking block, 7-4-5. Spacer block, 7-4-6. Cylinder, 7-4-7. Pin, 7-4-8. Connecting bolt, 7-4-9. Slot, 7-4-10. Oil cylinder, 7-4-11. Locking pin, 7-4-12. Switch mechanism, 7-5. Bolt hole, 8. Upper platform, 8-1. Winch maintenance railing, 8-2. Telescopic oil cylinder hydraulic tong boom, 8-3. Upper telescopic platform, 8-4. Escape rope suspension device, 8-5. Wire rope support device, 8-6. Tipping pedal, 8-7. Winch control console, 8-8. Upper basic platform, 8-9. Main control console, 8-10. Escape pedal, 9. Mast, 9-1. Winch I, 9-2. Winch II, 9-3. Mast hydraulic tong boom, 10. Turntable, 10-1. Turntable base plate, 10-2. Driving motor, 10-3. Turntable gear, 11. Built-in ladder, 12. Ram maintenance railing, 12-1. Maintenance railing ladder, 13. Cage ladder, 14. Inclined support, 15. Lifting oil cylinder. Detailed implementation mode

[0024] Embodiment 1 As a preferred embodiment of the present invention, a pressure - operated work machine for gas wells includes a lower working ram preventer 1 integrated on a skid, a balance pressure - relief system 2, an upper working ram preventer 3, a lower platform 4, an annular preventer 5, a first column 6, a fixed slip group 7, an upper platform 8, a mast 9, a rotary table 10, and a platform ladder. Among them, the fixed slip group 7 is arranged above the lower platform 4 and includes an upper fixing plate 7 - 1, a second column 7 - 2, a lower fixing plate 7 - 3, and several slips 7 - 4. The second column 7 - 2 is fixed between the upper fixing plate 7 - 1 and the lower fixing plate 7 - 3 by bolts. Both the upper fixing plate 7 - 1 and the lower fixing plate 7 - 3 are provided with bolt holes 7 - 5. The slip 7 - 4 includes a slip housing 7 - 4 - 1, slip teeth 7 - 4 - 2, a rocker arm 7 - 4 - 3, an oil cylinder 7 - 4 - 10, and a switching mechanism 7 - 4 - 12. The output end of the oil cylinder 7 - 4 - 10 is connected to the switching mechanism 7 - 4 - 12. A pin 7 - 4 - 7 with lower mechanical properties than the switching mechanism 7 - 4 - 12 is arranged between the rocker arm 7 - 4 - 3 and the switching mechanism 7 - 4 - 12. The oil cylinder 7 - 4 - 10 drives the switching mechanism 7 - 4 - 12 to drive the rocker arm 7 - 4 - 3 and the slip teeth 7 - 4 - 2 to act, thereby realizing the opening and closing of the slip 7 - 4. A strip - shaped hole 7 - 4 - 9 is arranged on the slip housing 7 - 4 - 1. The slip housing 7 - 4 - 1 is fixedly connected to the upper and lower fixing plates 7 - 3 through a connecting bolt 7 - 4 - 8 passing through the bolt hole 7 - 5 and the strip - shaped hole 7 - 4 - 9, so that the slip housing 7 - 4 - 1 can have a moving space along the strip - shaped hole 7 - 4 - 9 after being fixed. A spacer 7 - 4 - 5 is also arranged between the connecting bolt 7 - 4 - 8 and the slip housing 7 - 4 - 1. The connecting bolt 7 - 4 - 8 is also wrapped with a cylinder 7 - 4 - 6 in the strip - shaped hole 7 - 4 - 9. The spacer 7 - 4 - 5 is fixedly connected to the cylinder 7 - 4 - 6, effectively ensuring the limitation of the slip 7 - 4 while meeting the requirement that the slip 7 - 4 has an appropriate moving space. A lock block 7 - 4 - 4 is also sleeved outside the connecting bolt 7 - 4 - 8, and the lock block 7 - 4 - 4 is fixed on the spacer 7 - 4 - 5 by a lock pin 7 - 4 - 11. The upper platform 8 and the lower platform 4 are respectively arranged at the top and bottom of the first column 6. The upper platform 8 is provided with a flip - down pedal 8 - 6. The platform ladder is arranged below the flip - down pedal 8 - 6. A ram maintenance railing 12 is arranged below the lower platform 4. The ram maintenance railing 12 is provided with a maintenance railing ladder 12 - 1. The operator can reach the lower platform 4 from the inside of the work machine through the platform ladder and can reach the ram maintenance railing 12 through the maintenance railing ladder 12 - 1, realizing the maintenance and repair of the equipment from inside the platform.

[0025] On the one hand, the present invention can solve the problems of inconvenient maintenance and repair of the preventer group and the fixed slip group 7, and potential safety hazards in operation. On the other hand, it can reduce the wear of related parts such as the fixed slip group 7 and increase the service life.

[0026] Embodiment 2 As another preferred embodiment of the present invention, on the basis of Embodiment 1, further, the upper platform 8 includes an upper base platform 8-8, and the upper base platform 8-8 is fixedly installed with a telescopic oil cylinder hydraulic tong boom 8-2, a winch control console 8-7, and a main control console 8-9; the upper base platform 8-8 is also suspended and installed with a winch maintenance railing 8-1, and during operation, the operator can quickly reach the winch maintenance railing 8-1 to perform maintenance on the winch I 9-1 and the winch II 9-2.

[0027] The upper base platform 8-8 is also cooperatively installed with an upper telescopic platform 8-3. During operation, the upper telescopic platform 8-3 extends to increase the operation space, and during transportation, the platform retracts to meet the transportation requirements.

[0028] A cage ladder 13 is installed beside the upper telescopic platform 8-3, and an inclined support 14 is arranged at the bottom of the upper telescopic platform 8-3 to meet the installation requirements of the cage ladder 13.

[0029] In this embodiment, a corresponding telescopic platform is provided on the upper platform 8, which extends during operation to increase the operation space and reduce potential safety hazards at the same time.

[0030] Embodiment 3 As the best embodiment of the present invention, on the basis of Embodiments 1 and 2, further, the upper base platform 8-8 is also provided with an escape rope hanging device 8-4 and an escape pedal 8-10. The escape rope hanging device 8-4 can be quickly installed near each operator on the upper platform 8 and provides a hanging point for the wire rope type escape device. During construction operations, the escape pedal 8-10 is opened to the horizontal state to provide a standing platform for the operator. During transportation, the escape pedal 8-10 retracts to the vertical state and retracts into the guardrail to meet the transportation requirements; the escape rope hanging device 8-4 and the escape pedal 8-10 are provided to provide further safety protection for the personnel performing construction operations.

[0031] The lower platform 4 includes a lower base platform 4-2, and the lower base platform 4-2 is cooperatively installed with a lower telescopic platform 4-1. During operation, the lower telescopic platform 4-1 extends to increase the operation space, and during transportation, the platform retracts to meet the transportation requirements; a corresponding telescopic platform is provided on the lower platform 4, which extends during operation to increase the operation space and reduce potential safety hazards at the same time.

[0032] A wire rope support device 8-5 is installed above the flip pedal 8-6 on the upper platform 8.

[0033] The turntable 10 includes a turntable base plate 10-1, a turntable gear 10-3 and a slip 7-4. The top output end of the lifting cylinder 15 is provided under the rotating base plate, so that the turntable 10 is lifted and lowered by the lifting cylinder 15. The turntable 10 is also provided with a driving motor 10-2, which drives the pipe string to rotate through power and cooperates with the slip 7-4 to meet the workover operation processes such as underpressure drilling, cutting and sand washing.

[0034] The lower working ram blowout preventer 1 and the upper working ram blowout preventer 3 are arranged under the lower platform 4. The balance pressure relief system 2 is arranged between the lower working ram blowout preventer 1 and the upper working ram blowout preventer 3. The annular blowout preventer 5 is above the lower platform 4. The balance pressure relief system 2 includes a four-way joint 2-1, a balance system 2-2 and a blowout prevention system 2-3. The four-way joint 2-1 is installed between the lower working ram blowout preventer 1 and the upper working ram blowout preventer 3, and at the same time provides installation positions for the balance system 2-2 and the blowout prevention system 2-3. The well pressure is balanced to the upper end of the ram of the lower working ram blowout preventer 1 through the balance system 2-2, and the pressure in the four-way joint 2-1 is blown out through the blowout prevention system 2-3 to meet the requirement that the pressures on both sides of the ram are the same when the lower working ram blowout preventer 1 and the upper working ram blowout preventer 3 are opened.

[0035] A mast hydraulic tong boom 9-3 is fixedly installed on the mast 9.

[0036] Refer to Figure 1 - Figure 6 , the principle of the present invention is: The underpressure operation machine for gas wells is composed of components such as a lower working ram blowout preventer 1, a balance pressure relief system 2, an upper working ram blowout preventer 3, a lower platform 4, an annular blowout preventer 5, a first column 6, a fixed slip group 7, an upper platform 8, a mast 9, a turntable 10, a built-in ladder 11, a ram maintenance railing 12, a cage ladder 13, an inclined support 14, etc. By arranging the lower working ram blowout preventer 1 and the upper working ram blowout preventer 3 under the lower platform 4, and the annular blowout preventer 5 above the lower platform 4, and arranging the ram maintenance railing 12, it is convenient for operators to reach the lower platform 4 and the ram maintenance railing 12 through the built-in ladder 11 to repair and maintain the blowout preventer group and the fixed slip group 7; The upper platform 8 of the pressure - operated work machine for gas wells includes a winch maintenance railing 8 - 1, a telescopic cylinder hydraulic tong boom 8 - 2, an upper telescopic platform 8 - 3, an escape rope suspension device 8 - 4, a wire rope support device 8 - 5, a flip - down pedal 8 - 6, a winch control console 8 - 7, an upper base platform 8 - 8, a main control console 8 - 9, an escape pedal 8 - 10 and other components; the winch maintenance railing 8 - 1 is installed on the upper base platform 8 - 8 by a suspension method, and during operation, the operator can quickly reach the winch maintenance railing 8 - 1 to repair the winch I 9 - 1 and winch II 9 - 2; the upper telescopic platform 8 - 3 cooperates with the upper base platform 8 - 8, and the lower telescopic platform 4 - 1 cooperates with the lower base platform 4 - 2 to achieve the retraction of the platform during relocation to meet the transportation requirements, and the extension of the platform during operation to increase the working space. An inclined support 14 is provided below the upper telescopic platform 8 - 3 to meet the installation requirements of the cage ladder 13; a flip - down pedal 8 - 6 is provided in the upper base platform 8 - 8. When the flip - down pedal 8 - 6 is opened, the lower platform 4 can be reached through the built - in ladder 11, and the ram preventer maintenance railing 12 can be reached through the maintenance railing ladder 12 - 1, so as to realize the maintenance and repair of equipment from the inside of the platform, improve the convenience of on - site maintenance, and reduce the operation safety risk; The balance pressure - relief system 2 is composed of a four - way joint 2 - 1, a balance system 2 - 2 and a blow - out preventer system 2 - 3. The four - way joint 2 - 1 is installed between the lower working ram preventer 1 and the upper working ram preventer 3, and at the same time provides installation positions for the balance system 2 - 2 and the blow - out preventer system 2 - 3. Through the balance system 2 - 2, the well pressure is balanced to the upper end of the ram of the lower working ram preventer 1, and through the blow - out preventer system 2 - 3, the pressure inside the four - way joint is blown out to ensure that the pressures on both sides of the ram are the same when the lower working ram preventer 1 and the upper working ram preventer 3 are opened; The fixed slip group 7 consists of components such as the upper fixing plate 7-1, the second column 7-2, the lower fixing plate 7-3, the slip 7-4, the bolt hole 7-5, the strip hole 7-4-9, etc. The rotary table 10 consists of components such as the rotary table base plate 10-1, the drive motor 10-2, the rotary table gear 10-3, the slip 7-4, the strip hole 7-4-9, etc. The slip 7-4 consists of components such as the slip housing 7-4-1, the slip teeth 7-4-2, the rocker arm 7-4-3, the locking block 7-4-4, the spacer 7-4-5, the cylinder 7-4-6, the pin 7-4-7, the connecting bolt 7-4-8, the strip hole 7-4-9, the oil cylinder 7-4-10, the locking pin 7-4-11, the switch mechanism 7-4-12, etc. The oil cylinder 7-4-10 drives the switch mechanism 7-4-12 to drive the rocker arm 7-4-3 and the slip teeth 7-4-2 to act, so as to realize the opening and closing of the slip 7-4. A pin 7-4-7 is arranged between the rocker arm 7-4-3 and the switch mechanism 7-4-12. The pin 7-4-7 is made of a material with significantly lower mechanical properties relative to the switch mechanism 7-4-12, so as to set the pin 7-4-7 as a weak component and play a role in protecting the switch mechanism 7-4-12. The slip housing 7-4-1 is connected to the bolt hole 7-5 through the connecting bolt 7-4-8. A strip hole 7-4-9 is arranged on the slip housing 7-4-1 to cooperate with the connecting bolt 7-4-8, so that after the slip housing 7-4-1 is fixed, it can have a certain movement space along the strip hole 7-4-9. More beneficially, the spacer 7-4-5 below the connecting bolt 7-4-8 is fixedly connected through a cylinder 7-4-6 slightly thicker than the slip housing fixing plate, so as to effectively ensure the limitation of the slip 7-4 while meeting the requirement that the slip 7-4 has an appropriate movement space, reduce the damage of vulnerable parts, and extend the service life of components such as the switch mechanism 7-4-12 and the pin 7-4-7.

Claims

1. A pressure - operated workover rig for gas wells, comprising a lower working ram preventer (1) integrated by skid - mounting, a balanced pressure - relief system (2), an upper working ram preventer (3), a lower platform (4), an annular preventer (5), a first column (6), a fixed slip group (7), an upper platform (8), a mast (9), a rotary table (10), and a platform ladder, characterized in that: The fixed slip group (7) is arranged above the lower platform (4) and includes an upper fixing plate (7-1), a second column (7-2), a lower fixing plate (7-3) and a plurality of slips (7-4). The second column (7-2) is fixed between the upper fixing plate (7-1) and the lower fixing plate (7-3) by bolts. Bolt holes (7-5) are provided on both the upper fixing plate (7-1) and the lower fixing plate (7-3). The slip (7-4) includes a slip housing (7-4-1), slip teeth (7-4-2), a rocker arm (7-4-3), an oil cylinder (7-4-10), and a switching mechanism (7-4-12). The output end of the oil cylinder (7-4-10) is connected to the switching mechanism (7-4-12). A pin (7-4-7) with a lower mechanical property than the switching mechanism (7-4-12) is provided between the rocker arm (7-4-3) and the switching mechanism (7-4-12). The switching mechanism (7-4-12) is driven by the oil cylinder (7-4-10) to drive the rocker arm (7-4-3) and the slip teeth (7-4-2) to move, so as to realize the opening and closing of the slip (7-4). A strip hole (7-4-9) is provided on the slip housing (7-4-1). The slip housing (7-4-1) is fixedly connected to the upper fixing plate (7-1) or the lower fixing plate (7-3) respectively through a connecting bolt (7-4-8) passing through the bolt hole (7-5) and the strip hole (7-4-9), so that the slip housing (7-4-1) can move horizontally along the strip hole (7-4-9) after being fixed in the axial direction. A cushion block (7-4-5) is further provided between the connecting bolt (7-4-8) and the slip housing (7-4-1). A cylinder (7-4-6) is also wrapped around the connecting bolt (7-4-8) in the strip hole (7-4-9). The cushion block (7-4-5) is fixedly connected to the cylinder (7-4-6), effectively ensuring the limitation of the slip (7-4) while meeting the requirement that the slip (7-4) has an appropriate amount of movement space. A lock block (7-4-4) is sleeved outside the connecting bolt (7-4-8), and the lock block (7-4-4) is fixed on the cushion block (7-4-5) by a lock pin (7-4-11). The upper platform (8) and the lower platform (4) are respectively arranged at the top and bottom of the first column (6). The upper platform (8) is provided with a flipping pedal (8-6). The platform ladder is arranged below the flipping pedal (8-6). A ram repair railing (12) is arranged below the lower platform (4). The ram repair railing (12) is provided with a repair railing ladder (12-1). The operator can reach the lower platform (4) from the inside of the work machine through the platform ladder and can reach the ram repair railing (12) through the repair railing ladder (12-1) to realize the repair and maintenance of the equipment from the inside of the platform.

2. The pressure - holding operation machine for gas wells according to claim 1, wherein: The upper platform (8) includes an upper base platform (8-8). The upper base platform (8-8) is fixedly installed with a telescopic oil cylinder hydraulic tong boom (8-2), a winch control console (8-7), and a main control console (8-9); the upper base platform (8-8) is also suspended and installed with a winch maintenance railing (8-1).

3. The pressure-operated work machine for gas wells according to claim 2, characterized in that: The upper base platform (8-8) is also fitted with an upper telescopic platform (8-3). During operation, the upper telescopic platform (8-3) extends to increase the working space, and during transportation, the platform retracts to meet the transportation requirements.

4. The pressure - bearing operation machine for gas wells according to claim 3, wherein: A cage ladder (13) is installed beside the upper telescopic platform (8-3), and an inclined support (14) is provided at the bottom of the upper telescopic platform (8-3) to meet the installation requirements of the cage ladder (13).

5. The pressure - operated machine for gas wells according to claim 2, wherein: The upper base platform (8-8) is also provided with an escape rope suspension device (8-4) and an escape pedal (8-10). The escape rope suspension device (8-4) can be quickly installed near each operator on the upper platform (8) and provides a suspension point for the wire rope escape device. During construction operations, the escape pedal (8-10) is opened to the horizontal state to provide a standing platform for the operators. During transportation, the escape pedal (8-10) retracts to the vertical state and is retracted into the guardrail to meet the transportation requirements.

6. The pressure - operated work machine for gas wells according to claim 1, wherein: The lower platform (4) includes a lower base platform (4-2). The lower base platform (4-2) is fitted with a lower telescopic platform (4-1). During operation, the lower telescopic platform (4-1) extends to increase the working space, and during transportation, the platform retracts to meet the transportation requirements.

7. The pressure - bearing operation machine for gas wells according to claim 1, wherein: The upper platform (8) is installed with a wire rope support device (8-5) above the flip pedal (8-6).

8. The pressure-operated work machine for gas wells according to claim 1, characterized in that: The turntable (10) includes a turntable base plate (10-1), a turntable gear (10-3), and a slip (7-4). The top output end of a lifting oil cylinder (15) is provided under the rotating base plate, so that the turntable (10) is lifted and lowered by the lifting oil cylinder (15). The turntable (10) is also provided with a driving motor (10-2), which drives the pipe string to rotate through power and cooperates with the slip (7-4) to meet the workover operation processes such as underbalanced drilling, grinding, cutting, and sand washing.

9. The pressure - maintained operation machine for gas wells according to claim 1, wherein: The lower working ram blowout preventer (1) and the upper working ram blowout preventer (3) are arranged below the lower platform (4). The balance pressure relief system (2) is arranged between the lower working ram blowout preventer (1) and the upper working ram blowout preventer (3). The annular blowout preventer (5) is above the lower platform (4). The balance pressure relief system (2) includes a four-way joint (2-1), a balance system (2-2), and a blowout system (2-3). The four-way joint (2-1) is installed between the lower working ram blowout preventer (1) and the upper working ram blowout preventer (3), and at the same time provides installation positions for the balance system (2-2) and the blowout system (2-3). Through the balance system (2-2), the well pressure is balanced to the upper end of the ram of the lower working ram blowout preventer (1), and through the blowout system (2-3), the pressure in the four-way joint (2-1) is blown out to meet the requirement that the pressures on both sides of the ram are the same when the lower working ram blowout preventer (1) and the upper working ram blowout preventer (3) are opened.

10. A pressure - maintained operation machine for gas wells according to claim 1, characterized in that: A mast hydraulic tong boom (9-3) is fixedly installed on the mast (9).

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