Under-pressure valve replacing, taking and conveying device

Abstract

The utility model discloses an under-pressure valve replacement taking and conveying device which comprises a union flange, a door-shaped sealing frame, a blowout prevention pipe and a conveying rod, the lower end of the door-shaped sealing frame is connected with the union flange used for being connected with a wellhead in a sealing mode, and the lower end of the door-shaped sealing frame is communicated with the union flange to form a first cavity. The upper end of the door-shaped sealing frame is hermetically connected with a blowout prevention pipe, and the upper end of the door-shaped sealing frame is communicated with the blowout prevention pipe to form a second cavity; the two ends of the conveying rod penetrate through the door-shaped sealing frame and are arranged in the first cavity and the second cavity respectively, and the first cavity and the second cavity are communicated through a balance manifold. And the lower end of the conveying rod is connected with the BPV valve or the VR plug, so that the BPV valve or the VR plug is conveyed to a wellhead device through the conveying rod for plugging. According to the taking and conveying device, the conveying rod can be manually and hydraulically controlled to convey the VR plug or the BPV valve into a wellhead device, safety and reliability are achieved, and valve replacement under pressure is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance and repair of wellhead devices and casing heads in the oil and gas industry, in particular to a pressure-operated valve-changing and delivering device. Background Art

[0002] During the oil and gas production process, abnormal situations such as internal and external leakage of the main control valve of the wellhead device often occur. In order to solve such safety hazards, the pressure valve replacement method is usually adopted. The specific implementation method is: if the wellhead device has a back pressure valve (Back Pressure Valve referred to as BPV valve) or a valve removal plug (Valve Removal plug referred to as VR plug) thread, the BPV valve or VR plug is sent to the corresponding BPV valve or VR plug thread of the wellhead device for sealing, and the faulty valve is replaced. However, what device is used to send the BPV valve or VR plug to the wellhead device for sealing is a problem that urgently needs to be solved. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a pressure valve replacement and delivery device to deliver the BPV valve or VR plug to the wellhead device for plugging, thereby realizing the pressure valve replacement.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] A pressure-changing valve delivery device comprises: a union flange, a gate-type sealing frame, a lubricant preventer, and a transmission rod. The lower end of the gate-type sealing frame is sealingly connected to the union flange for connection to a wellhead, and the lower end of the gate-type sealing frame and the union flange are communicated to form a first cavity; the upper end of the gate-type sealing frame is sealingly connected to the lubricant preventer, and the upper end of the gate-type sealing frame and the lubricant preventer are communicated to form a second cavity; both ends of the transmission rod pass through the gate-type sealing frame and are respectively arranged in the first cavity and the second cavity, and the first cavity and the second cavity are communicated through a balancing manifold; the lower end of the transmission rod is connected to a BPV valve or a VR plug, so that the BPV valve or VR plug can be delivered to the wellhead device via the transmission rod for sealing.

[0006] As a further improvement, the balancing manifold is provided with at least one angle stop valve to open and close the connection between the first cavity and the second cavity; and / or the balancing manifold is also provided with a pressure gauge to display the pressure in the blowout preventer.

[0007] As a further improvement, the pick-up and delivery device cooperates with the friction pipe clamp to move the position of the transmission rod.

[0008] As a further improvement, both ends of the door-type sealing frame are respectively connected to a pipe joint, and a hydraulic pump is connected through the pipe joint to increase or decrease the pressure at both ends of the door-type sealing frame.

[0009] As a further improvement, a stop valve is provided on the pipe joint.

[0010] As a further improvement, the conveying rod is printed with a scale using laser to indicate the position of the conveying rod.

[0011] As a further improvement, the picking and delivering device is provided with a union cap, including a first union cap and a second union cap, the first union cap is provided at the connection between the union flange and the door-type sealing frame, and the second union cap is provided at the connection between the lubricant preventer and the door-type sealing frame.

[0012] As a further improvement, the upper end of the blowout preventer is sealed and connected with a plug, and the upper end of the plug is provided with a lifting eye screw.

[0013] As a further improvement, a second union cap is provided at the connection between the plug and the lubricant preventer.

[0014] As a further improvement, the door-type sealing frame is composed of an upper joint, a lower joint, a connecting plate and a connecting screw;

[0015] The stuffing boxes in the upper and lower joints are installed with rod seals, and the connecting screws connect the two connecting plates arranged above and below; the upper and lower joints are respectively connected to one of the connecting plates for connecting to the non-impeded flange and the blowout preventer, and the balancing manifold and pipe joint are connected to the upper and lower joints; and / or

[0016] The threaded connections between the sealing transmission rod, upper joint, lower joint and connecting plate are fixed with saddle screws.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] The taking and delivering device of the utility model can manually or hydraulically control the delivery rod to deliver the VR plug or BPV valve into the wellhead device, which is safe and reliable and realizes valve replacement under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a pressure-operated valve-changing and delivering device of the utility model;

[0020] Figure 2 This is a structural diagram of the door-type sealing frame of the utility model;

[0021] Figure 3 This is a schematic structural diagram of the friction pipe wrench of the utility model;

[0022] Figure 4 for Figure 1 An enlarged view of part I;

[0023] Figure 5 for Figure 1Enlarged view of Part II.

[0024] Reference numerals:

[0025] 1. Union flange; 2. First union cap; 3. Pipe joint; 4. Rod seal; 5. Balancing manifold; 6. Gate seal frame; 7. Second union cap; 8. Blowout preventer; 9. Pressure gauge; 10. Transfer rod; 11. Plug; 12. Eye screw; 13. Friction pipe wrench; 14. First O-ring; 15. Second O-ring; 16. Third O-ring; 17. Fourth O-ring; 61. Upper joint; 62. Connecting screw; 63. Connecting plate; 64. Lower joint; 65. Stuffing box; 66. Saddle screw. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example

[0028] Combined with attachment Figure 1-5 As shown, a pressure valve replacement and delivery device includes: a union flange 1, a gate-type sealing frame 6, a lubricator 8 and a transmission rod 10, etc., wherein the lower end of the gate-type sealing frame 6 is sealed and connected to the union flange 1, and the union flange 1 is connected to the wellhead to withstand the wellhead pressure and the weight of the device; the lower end of the gate-type sealing frame 6 and the union flange 1 are connected to form a first cavity; the upper end of the gate-type sealing frame 6 is sealed and connected to the lubricator 8, and the lubricator 8 accommodates the transmission rod 10 and withstands pressure. The number of lubricators can be increased as needed to accommodate longer transmission rods. Rod 10; a second cavity is formed by the upper end of the gate-type sealing frame 6 and the lubricator 8; the lower end of the transmission rod 10 passes through the gate-type sealing frame 6 and is located in the first cavity, and the upper end passes through the gate-type sealing frame 6 and is located in the second cavity. During operation, the pick-up and delivery device is hoisted, the lower end of the transmission rod 10 is connected to the BPV valve or VR plug, and the union flange 1 is connected to the wellhead device. The VR plug or BPV valve can be delivered manually and hydraulically to send the BPV valve or VR plug to the wellhead device through the transmission rod 10 for sealing.

[0029] As a further technical solution, the lower and upper ends of the door-type sealing frame 6 are respectively connected to the same balancing manifold 5, so that the lower and upper ends of the door-type sealing frame 6 are connected through the balancing manifold 5, thereby realizing the connection between the first cavity and the second cavity and ensuring the pressure balance in the first cavity and the second cavity.

[0030] Preferably, the balancing manifold 5 is provided with at least one angle shutoff valve to balance or isolate the well pressure from the pressure within the lubricant preventer 8, thereby opening and closing the connection between the first and second chambers. The balancing manifold 5 is also provided with a pressure gauge 9 to display the pressure within the lubricant preventer 8.

[0031] In an optional embodiment, the picking and delivering device cooperates with the friction pipe clamp 13 to move the position of the transmission rod 10. The method is manual delivery. The specific operation is: open the angle stop valve on the balance manifold 5. At this time, the pressure of the wellhead device is balanced with the pressure in the second cavity of the blowout preventer 8. Use the friction pipe clamp 13 to act on the light rod part in the middle of the transmission rod 10. The transmission rod 10 is lifted, lowered or rotated non-destructively. The friction force of the well pressure on the transmission rod 10 can be overcome to send the VR plug or BPV valve to the specified position for sealing.

[0032] In another optional embodiment, when the frictional force of the well pressure on the delivery rod 10 cannot be overcome by human power alone, a hydraulic delivery tool can be used. The delivery device is also provided with two pipe joints 3, each of which has a shut-off valve connected to a hydraulic pipe for pressure relief or injection operations; the two pipe joints 3 are respectively connected to the lower and upper ends of the gate-type sealing frame 6 to form the hydraulic delivery tool; the hydraulic delivery tool is operated as follows: the angle shut-off valve on the balancing manifold 5 is closed, at which time the wellhead pressure is isolated from the pressure in the second cavity of the blowout preventer 8, and the pipeline connected to the pipe joint 3 at the upper end of the gate-type sealing frame 6 is connected to the hydraulic pump for pressurization, which can push the delivery rod 10 to move and deliver the VR plug or BPV valve to the specified position.

[0033] Preferably, after the VR plug or BPV valve is delivered to the designated wellhead position using a hydraulic delivery tool, a friction pipe clamp 13 can be used to rotate the delivery rod 10 to seal the VR plug or BPV valve seat against the threads of the back pressure valve (BPV valve) or valve removal plug (VR plug) to achieve the seal. The delivery rod 10 is used to connect to the VR plug or BPV valve and has a laser-printed scale to indicate the delivery rod position. Delivery rods of different lengths can be configured depending on the thread position of the back pressure valve (BPV valve) or valve removal plug (VR plug).

[0034] When it is necessary to retract the transmission rod 10, after the rotary seat seal is completed, the transmission rod 10 and the VR plug or BPV valve are released. At this time, the angle stop valve on the balancing manifold 5 is closed, and the stop valve opening on the pipe joint 3 at the upper end of the gate-type sealing frame 6 is controlled. The transmission rod 10 can be retracted using the well pressure.

[0035] Preferably, in this embodiment, the picking and delivering device is further provided with a union cap for pressing and fixing the door-type sealing frame 6, the lubricant preventer 8 and the plug 11; it includes a first union cap 2 and a second union cap 7, the first union cap 2 is arranged at the connection between the union flange 1 and the door-type sealing frame 6, and the second union cap 7 is arranged at the connection between the lubricant preventer 8 and the door-type sealing frame 6.

[0036] In an optional solution, a plug 11 is sealedly connected to the upper end of the lubricator 8. A lifting eye screw 12 is provided at the upper end of the plug 11 to facilitate the lifting of the delivery device. The lifting eye screw 12 is also provided separately from the plug 11 to facilitate its replacement. Preferably, a second union cap 7 is also provided at the connection between the plug 11 and the lubricator 8.

[0037] In another optional solution, a gate-type sealing frame 6 is used to seal the transmission rod 10, withstand wellhead pressure and the pressure inside the lubricator, and connect the balancing manifold 5, pipe joint 3, and lubricator 8. The gate-type sealing frame 6 consists of an upper joint 61, a lower joint 64, a connecting plate 63, and a connecting screw 62. Each upper and lower joint has a stuffing box 65 for installing the rod seal 4. The connecting screw 62 connects the two connecting plates 63 arranged above and below. The upper joint 61 and the lower joint 64 are respectively connected to the middle of a connecting plate, used to connect to the union flange 1 and the lubricator 8, and the balancing manifold 5 and the pipe joint 3 are connected to the upper joint 61 and the lower joint 64. The threaded connections between the sealed transmission rod 10, the upper joint 61, the lower joint 64, and the connecting plate 63 are fixed with saddle screws 66 to prevent them from loosening. Rod seals 4 are provided in the upper end of the first cavity and the lower end of the second cavity within the gate-type sealing frame 6 to seal the transmission rod 10. The gate-type sealing frame 6 is sealedly connected to the union flange 1 and the lubricator 8, as well as the lubricator 8 and the plug 11. O-rings are provided on both contact surfaces. These O-rings include a first O-ring 14, a second O-ring 15, a third O-ring 16, and a fourth O-ring 17. They are used to seal the lower joint between the union flange 1 and the gate-type sealing frame 6, the upper joint between the gate-type sealing frame 6 and the lubricator 8, and the lubricator 8 and the plug 11. These seals protect two inner and outer circular seals and one cross-sectional seal.

[0038] The taking and delivering device of the utility model can manually or hydraulically deliver the VR plug or BPV valve into the wellhead device, which is safe and reliable and realizes valve replacement under pressure.

[0039] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A pressure valve replacement and delivery device, characterized in that: include: A union flange, a gate-type sealing frame, a lubricant preventer and a transmission rod. The lower end of the gate-type sealing frame is sealed and connected to the union flange for connection to the wellhead. The lower end of the gate-type sealing frame and the union flange are communicated to form a first cavity. The upper end of the gate-type sealing frame is sealed and connected to the lubricant preventer. The upper end of the gate-type sealing frame and the lubricant preventer are communicated to form a second cavity. Both ends of the transmission rod pass through the gate-type sealing frame and are respectively arranged in the first cavity and the second cavity. The first cavity and the second cavity are communicated through a balancing manifold. The lower end of the transmission rod is connected to the BPV valve or VR plug so that the BPV valve or VR plug can be sent to the wellhead device through the transmission rod for sealing.

2. The pressure-operated valve-changing and transporting device according to claim 1, characterized in that: The balancing manifold is provided with at least one angle stop valve to open and close the communication between the first cavity and the second cavity; and / or the balancing manifold is also provided with a pressure gauge to display the pressure in the blowout preventer.

3. The pressure-operated valve-changing and transporting device according to claim 1, characterized in that: The pick-up and delivery device cooperates with the friction pipe clamp to move the position of the transmission rod.

4. The pressure-operated valve-changing and transporting device according to claim 1, characterized in that: The two ends of the door-shaped sealing frame are respectively connected with a pipe joint, and the hydraulic pump is connected through the pipe joint to increase or decrease the pressure at the two ends of the door-shaped sealing frame.

5. The pressure-operated valve-changing and transporting device according to claim 4, characterized in that: A stop valve is provided on the pipe joint.

6. The pressure-operated valve-changing and transporting device according to claim 1, characterized in that: The conveying rod is printed with a scale by laser to indicate the position of the conveying rod.

7. The pressure-operated valve-changing and transporting device according to any one of claims 1 to 6, characterized in that: The picking and delivering device is provided with a union cap, including a first union cap and a second union cap. The first union cap is provided at the connection between the union flange and the door-type sealing frame, and the second union cap is provided at the connection between the lubricator and the door-type sealing frame.

8. The pressure-operated valve-changing and transporting device according to claim 7, characterized in that: The upper end of the blowout preventer is sealed with a plug, and the upper end of the plug is provided with a lifting eye screw.

9. The pressure-operated valve-changing and transporting device according to claim 8, characterized in that: A second union cap is provided at the connection between the plug and the lubricant preventer.

10. The pressure-operated valve-changing and transporting device according to any one of claims 1 to 6, characterized in that: The door-type sealing frame is composed of an upper joint, a lower joint, a connecting plate and a connecting screw; The stuffing boxes in the upper and lower joints are installed with rod seals, and the connecting screws connect the two connecting plates set up above and below. The upper and lower joints are respectively connected to one of the connecting plates for connecting to the non-ferrous flange and the blowout preventer, and the balancing manifold and pipe joint are connected to the upper and lower joints. and / or The threaded connections between the sealing transmission rod, upper joint, lower joint and connecting plate are fixed with saddle screws.

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