阅读说明：本技术 一种机械带压修阀装置及其使用方法 (Mechanical under-pressure valve repairing device and using method thereof ) 是由 白登平 张洋 白渝雄 于 2021-08-31 设计创作，主要内容包括：本发明提供了一种机械带压修阀装置及其使用方法,通过修阀工具对阀体的故障阀门进行封堵,修阀工具通过活塞中心杆组件与堵塞器组件、手轮以及传动组件,在结构上面简单紧凑,可实现对故障阀门的有效封堵,堵塞器组件包括铁头、密封杆和密封胶筒,通过对活塞中心杆组件的调节,可将堵塞器组件的密封胶筒在阀体的通道内进行两次密封,大大提高了堵塞器对气道的封堵效果,同时通过放喷法兰上的压力表可观察故障阀门内压力的变化,避免作业过程中气体压力异常产生危险。(The invention provides a mechanical under-pressure valve repairing device and a using method thereof.A failed valve of a valve body is plugged by a valve repairing tool, the valve repairing tool is simple and compact in structure through a piston central rod component, a blanking plug component, a hand wheel and a transmission component, the failed valve can be effectively plugged, the blanking plug component comprises an iron head, a sealing rod and a sealing rubber cylinder, the sealing rubber cylinder of the blanking plug component can be sealed twice in a channel of the valve body by adjusting the piston central rod component, the plugging effect of the blanking plug on an air passage is greatly improved, and meanwhile, the pressure change in the failed valve can be observed through a pressure gauge on a blowout flange, so that the danger caused by abnormal gas pressure in the operation process is avoided.)

1. The mechanical under-pressure valve repairing device is characterized by comprising a valve repairing tool which extends into a channel of a valve body (8) to work; the valve repairing tool comprises a piston center rod assembly, a blowout flange (4), a cylinder barrel assembly, a blanking plug assembly, a hand wheel (15) and a transmission assembly; the blow-off flange (4) is assembled at one end of the cylinder barrel component close to the valve body (8) in the direction, and an inner hole of the blow-off flange (4) is provided with a pressure channel (18) for installing a pressure gauge and a release valve; the piston center rod assembly sequentially penetrates through the cylinder barrel assembly and the blowout flange (4), the blanking plug assembly is assembled at one end of the piston center rod assembly close to the valve body (8) in the direction, and the blanking plug assembly is driven by the piston center rod assembly to extend into the valve body (8); a hand wheel (15) is assembled on the piston center rod component; the transmission assembly is assembled on the cylinder barrel assembly, the hand wheel (15) controls the piston central rod assembly to stretch and retract through the transmission assembly, and meanwhile, the piston central rod assembly drives the blanking plug assembly to stretch and move in a channel of the valve body (8) and realize plugging;

the blanking plug assembly comprises an iron head (7), a sealing rod (5) and a sealing rubber cylinder (16); the iron head (7) is in threaded connection with the end part of the piston central rod assembly, the sealing rod (5) is provided with an inner hole, and a sealing ring is arranged in the inner hole and is in threaded connection with the piston central rod assembly; the sealing rubber cylinder (16) is sleeved on the piston center rod component and is positioned between the iron head (7) and the sealing rod (5).

2. The mechanical valve repairing device with pressure as claimed in claim 1, wherein the cylinder assembly comprises a cylinder (1) and a cylinder joint (3), the cylinder joint (3) is connected to one end of the cylinder (1) through threads, and the blowout flange (4) is connected to the cylinder joint (3) through threads; the cylinder barrel (1) is of a hollow barrel structure, a strip-shaped key groove is formed in the inner wall of the barrel, and the piston center rod assembly penetrates through the cylinder barrel (1) and is matched with the strip-shaped key groove of the cylinder barrel (1); be equipped with the seal groove on the inner wall of cylinder joint (3), piston center pole subassembly runs through in cylinder joint (3), and through the sealed cooperation of sealing washer and seal groove, realizes the sealed to piston center pole subassembly.

3. The mechanical belt pressure valve repairing device according to claim 1, wherein the piston center rod assembly comprises a piston rod (2) and a center rod (6), the center rod (6) penetrates through the piston rod (2), a strip-shaped key groove is formed in the outer side wall of the piston rod (2), the inner wall of the cylinder barrel assembly is matched with the outer wall strip-shaped key groove of the piston rod (2), the end portion, close to the hand wheel (15), of the piston rod (2) is in threaded connection with the adjusting nut (10), and the other end of the piston rod (2) is in threaded connection with the end portion of the sealing rod (5).

4. A mechanical snubbing valve unit according to claim 3, wherein the central rod (6) is a stepped rod, wherein the stepped section of the central rod (6) cooperates with the adjusting nut (10) for controlling the blanking plug assembly.

5. The mechanical pressure repairing valve device according to claim 4, wherein one end of the central rod (6) is in threaded connection with the locking nut (12), and the other end of the central rod (6) is in threaded connection with the sealing rubber cylinder (16) and the iron head (7) in sequence.

6. The mechanical pressure repairing valve device according to the claim 1, characterized in that the transmission component comprises an upper shell (13), a bearing (9), a copper nut (11) and an end cover (14); one end of the upper shell (13) is provided with internal threads for connecting with the cylinder barrel assembly; the other end of the upper shell (13) is provided with a bearing mounting hole, the end part is provided with a thread, and the end cover (14) is in threaded connection with the end part of the thread of the upper shell (13); the bearing (9) and the copper nut (11) are arranged in the bearing mounting hole, a baffle table is arranged on the copper nut (11), the bearing (9) is mounted on two sides of the baffle table, an outer hexagon is arranged at the end part of the copper nut (11), external threads are arranged at the rear end of the outer hexagon, and the hand wheel is fixedly assembled on the outer hexagon through a fixing nut; the inner wall of the copper nut (11) is provided with threads, and the piston center rod component is in threaded connection with the copper nut (11).

7. The mechanical under-pressure valve repairing device according to claim 1, wherein the blowout flange (4) is in sealing connection with the valve body (8) through an octagonal cushion steel ring (17), an inner hole is formed in the end face of the blowout flange (4), and the blanking plug assembly moves in a channel of the valve body (8) through a piston center rod assembly.

8. The mechanical pressure repairing valve device according to claim 1, wherein the piston center rod assembly, the blowout flange (4), the cylinder barrel assembly, the blanking plug assembly, the hand wheel (15) and the transmission assembly are coaxially arranged.

9. The use method of the mechanical valve repairing device with pressure is based on any one of claims 1 to 7, and is characterized by comprising the following steps:

measuring the length of the valve body (8), determining a preset position of a sealing rubber cylinder (16) entering a channel of the valve body (8), pushing a piston center rod assembly to enter the channel of the valve body (8) to block an air channel by rotating a hand wheel (15), driving the sealing rubber cylinder (16) to reach a specified position by the piston center rod assembly, retesting the displacement size, and adjusting the piston center rod assembly after the displacement size is correct, so that gas in the valve channel pressurizes the sealing rubber cylinder (16), and pushes the sealing rubber cylinder (16) to expand for the first time; adjusting the piston center rod assembly to enable the piston center rod assembly to move backwards, simultaneously extruding the sealing rubber cylinder (16), pressurizing the sealing rubber cylinder (16) for the second time, plugging an air passage of a passage of the valve body (8), observing a pressure gauge value on the blowout flange (4), and finishing plugging when the pressure is zero, no exhaust sound exists, and continuously observing that the pressure gauge value is unchanged;

under the plugging state, repairing the fault valve; after the repairing work is finished, the central rod assembly of the piston is adjusted, the plugging of the air passage plugging part is removed, the hand wheel (15) is rotated, the central rod assembly of the piston returns to a preset position, the valve is closed, the air release valve is opened, and the pressure gauge is observed to finish the deblocking after being emptied.

10. The use method of the mechanical pressure valve repairing device is characterized in that when the sealing rubber cylinder (16) is expanded for the first time, the piston center rod assembly is adjusted in a mode that an adjusting nut (10) connected with the end of the piston center rod assembly is adjusted; when the sealing rubber cylinder (16) is pressurized for the second time, the piston central rod assembly is adjusted in a mode that a locking nut (12) connected with the end of the piston central rod assembly is adjusted.

Technical Field

The invention relates to the technical field of well control, in particular to a mechanical under-pressure valve repairing device and a using method thereof.

Background

The oil and gas well mouth is exploited for a long time, a plurality of leakage problems of the well mouth control valve occur, such as corrosion, seal aging, seal abrasion and the like, so that the valve and other well mouth parts are easy to leak inwards or outwards, the production of the gas well is seriously influenced, and once the result of runaway is serious, a tool and a technology for repairing the valve under pressure are needed. The conventional process adopts a well killing maintenance valve, a special tool is used for maintaining a fault valve under pressure, the existing tool mainly adopts hydraulic drive, more necessary supporting equipment such as a hydraulic pump, an oil tank, an oil delivery pipe, a hydraulic cylinder and the like are needed, the valve air passage is blocked by an operation tool, the blocking is continuously carried out by depending on the oil pressure of the hydraulic cylinder, and if a hydraulic system fails in the blocking process, serious influence is caused.

Disclosure of Invention

The invention provides a mechanical under-pressure valve repairing device and a using method thereof, aiming at the problems that the conventional process adopts a well killing valve, the number of involved pens is large, the operation is complex, the external work is easy to depend on, and the plugging effect on an air passage is poor.

The invention is realized by the following technical scheme:

a kind of mechanical belt presses and repairs the valve gear, including stretching into the working repair valve tool in the valve block channel; the valve repairing tool comprises a piston center rod assembly, a blowout flange, a cylinder barrel assembly, a blanking plug assembly, a hand wheel and a transmission assembly; the blowout flange is assembled at one end of the cylinder barrel assembly close to the valve body, and an inner hole of the blowout flange is provided with a pressure channel for mounting a pressure gauge and a release valve; the piston center rod assembly sequentially penetrates through the cylinder barrel assembly and the blowout flange, the plug assembly is assembled at one end of the piston center rod assembly close to the valve body, and the plug assembly is driven by the piston center rod assembly to extend into the valve body; the hand wheel is assembled on the piston central rod component; the transmission assembly is assembled on the cylinder barrel assembly, the hand wheel controls the piston central rod assembly to stretch and retract through the transmission assembly, and meanwhile, the piston central rod assembly drives the blanking plug assembly to stretch and retract in a channel of the valve body and realize plugging;

the blanking plug assembly comprises an iron head, a sealing rod and a sealing rubber cylinder; the iron head is in threaded connection with the end part of the piston central rod assembly, the sealing rod is provided with an inner hole, and a sealing ring is arranged in the inner hole and is in threaded connection with the piston central rod assembly; the sealing rubber cylinder is sleeved on the piston center rod assembly and is positioned between the iron head and the sealing rod.

Preferably, the cylinder barrel assembly comprises a cylinder barrel and a cylinder barrel joint, the cylinder barrel joint is connected to one end of the cylinder barrel through threads, and the blowout flange is connected to the cylinder barrel joint through threads; the cylinder barrel is of a hollow barrel structure, a strip-shaped key groove is formed in the inner wall of the barrel, and the piston center rod assembly penetrates through the cylinder barrel and is matched with the strip-shaped key groove of the cylinder barrel; be equipped with the seal groove on the inner wall that the cylinder connects, in the piston center pole subassembly runs through the cylinder connects, and through the sealed cooperation of sealing washer and seal groove, realize the sealed to piston center pole subassembly.

Preferably, well core rod subassembly includes piston rod and king-rod in the piston, and well core rod runs through and sets up in the piston rod, and the lateral wall of piston rod is equipped with the bar keyway, and the inner wall of cylinder subassembly and the cooperation of the outer wall bar keyway of piston rod, the tip and the adjusting nut threaded connection that the piston rod is close to the hand wheel, the other end of piston rod and the tip threaded connection of sealing rod.

Further, the central rod is a stepped rod, wherein the step section of the central rod is matched with an adjusting nut for controlling the blanking plug assembly.

Furthermore, one end of the central rod is in threaded connection with the locking nut, and the other end of the central rod is in threaded connection with the sealing rubber cylinder and the iron head in sequence.

Preferably, the transmission assembly comprises an upper shell, a bearing, a copper nut and an end cover; one end of the upper shell is provided with an internal thread which is used for being connected with the cylinder barrel assembly; the other end of the upper shell is provided with a bearing mounting hole, the end part of the upper shell is provided with a thread, and the end cover is in threaded connection with the end part of the thread of the upper shell; the bearing and the copper nut are arranged in the bearing mounting hole, the copper nut is provided with a baffle table, two sides of the baffle table are used for mounting the bearing, the end part of the copper nut is provided with an outer hexagon, the rear end of the outer hexagon is provided with an external thread, and the hand wheel is fixedly assembled on the outer hexagon through a fixing nut; the inner wall of the copper nut is provided with threads, and the piston center rod component is in threaded connection with the copper nut.

Preferably, the blowout flange is in sealing connection with the valve body through an octagonal backing steel ring, an inner hole is formed in the end face of the blowout flange, and the blanking plug assembly moves in a channel of the valve body through the piston center rod assembly.

Preferably, the piston center rod assembly, the blowing flange, the cylinder barrel assembly, the blanking plug assembly, the hand wheel and the transmission assembly are coaxially arranged.

The use method of the mechanical under-pressure valve repairing device is based on the mechanical under-pressure valve repairing device and is characterized by comprising the following steps:

measuring the length of the valve body, determining a preset position of a sealing rubber cylinder entering a channel of the valve body, pushing a piston central rod assembly to enter the channel of the valve body to block an air passage by rotating a hand wheel, driving the sealing rubber cylinder to reach a specified position by the piston central rod assembly, re-measuring the displacement size, and adjusting the piston central rod assembly after the displacement size is correct, so that gas in the valve channel pressurizes the sealing rubber cylinder, and pushes the sealing rubber cylinder to expand for the first time; adjusting the piston center rod assembly to enable the piston center rod assembly to move backwards, simultaneously extruding the sealing rubber cylinder, secondarily pressurizing the sealing rubber cylinder, plugging an air passage of a passage of the valve body, observing a pressure gauge value on the blowout flange, and completing plugging when the pressure is zero and no exhaust sound exists and continuously observing that the pressure gauge value is unchanged;

under the plugging state, repairing the fault valve; after the repairing work is finished, the piston center rod assembly is adjusted, the plugging of the air passage plugging part is removed, the hand wheel is rotated, the piston center rod assembly returns to a preset position, the valve is closed, the air release valve is opened, and the pressure gauge is observed to be emptied, so that the deblocking is finished.

Preferably, when the sealing rubber cylinder is expanded for the first time, the piston central rod assembly is adjusted in a mode that an adjusting nut connected with the end of the piston central rod assembly is adjusted; when the sealing rubber cylinder is pressurized for the second time, the piston central rod assembly is adjusted in a mode that a locking nut connected with the end of the piston central rod assembly is adjusted.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides a mechanical valve repairing device with pressure, which is characterized in that a fault valve of a valve body is plugged by a valve repairing tool, the valve repairing tool is simple and compact in structure through a piston center rod assembly, a blanking plug assembly, a hand wheel and a transmission assembly, the fault valve can be effectively plugged, the blanking plug assembly comprises an iron head, a sealing rod and a sealing rubber cylinder, the sealing rubber cylinder of the blanking plug assembly can be sealed twice in a channel of the valve body by adjusting the piston center rod assembly, the plugging effect of the blanking plug on an air passage is greatly improved, and meanwhile, the pressure change in the fault valve can be observed through a pressure gauge on a blowout flange, so that the danger caused by abnormal gas pressure in the operation process is avoided.

Further, prevent that flange, cylinder joint and cylinder are all fixed through threaded connection for the overall stability and the reliability of instrument increase, the section of thick bamboo inner wall of cylinder is equipped with the bar keyway, and in the piston center pole subassembly runs through the cylinder, and with the cooperation of cylinder bar keyway, improved the stability of structure between piston center pole subassembly and the cylinder.

Furthermore, the plug assembly is driven to plug in the valve body channel by adjusting the piston center rod assembly, the plugging process of the air channel is safe and reliable, the whole process is controllable, risks in the operation process are reduced, the equipment operation is faster and safer, and the operation efficiency is improved.

Furthermore, the adjusting nut is adopted to control the positions of the central rod and the piston rod to control the blockage of the sealant barrel, so that the personnel for plugging and deblocking have fewer operating procedures, and the operation is simpler and more reliable.

Furthermore, the hand wheel controls the movement of the center rod assembly in the piston through the transmission assembly, the convenience is improved, and meanwhile, the plug assembly is driven by the center rod assembly of the control piston to conveniently plug the valve body channel, so that the tool is more miniaturized. The transmission assembly adopts a transmission mode that 2 groups of bearings are arranged in the upper shell, the bearings are arranged on the copper nuts, and the bearings are fixed by the end covers, so that the transmission mode is efficient, labor-saving and reliable in operation.

A use method of a mechanical valve repairing device with pressure reduces field operation personnel and operation steps. 2 operators are needed on site to complete the work of repairing the valve under pressure. The hand wheel drives the lead screw to mechanically drive the piston rod, so that the blanking plug can enter a designated position. The field personnel only need confirm the blanking plug and get into the degree of depth, then operate the hand wheel, and the blanking plug gets into predetermined position after, the shutoff blanking plug, and inspection sealing reliability maintains the valve damage portion as required, obviously promotes in work efficiency and security.

Drawings

Fig. 1 is a schematic structural diagram of a mechanical pressure repairing valve device in the invention.

In the figure: 1-a cylinder barrel; 2-a piston rod; 3-cylinder barrel joint; 4-blowout prevention flange; 5-sealing rod; 6-a central rod; 7-iron head; 8-a valve body; 9-a bearing; 10-adjusting the nut; 11-copper nuts; 12-a lock nut; 13-an upper housing; 14-an end cap; 15-hand wheel; 16-sealing rubber cylinder; 17-octagonal cushion steel rings; 18-pressure channel.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, in an embodiment of the present invention, a mechanical valve repairing device with pressure is provided, which has a simple and compact structure, is easy to install and operate, has less dependence on the outside, and can promote effective blocking of an air passage by a tool, reduce risks in an operation process, make equipment operation faster and safer, promote operation efficiency, reduce operation steps of field personnel, and provide a faster, safer and more efficient tool for repairing a faulty valve of an oil or gas well.

Specifically, the mechanical under-pressure valve repairing device comprises a valve repairing tool which extends into a channel of the valve body 8 to work; the valve repairing tool comprises a piston center rod assembly, a blowout flange 4, a cylinder barrel assembly, a blanking plug assembly, a hand wheel 15 and a transmission assembly; the blowout flange 4 is assembled at one end of the cylinder barrel component close to the direction of the valve body 8, the inner hole of the blowout flange 4 is provided with a pressure channel 18 for installing a pressure gauge and a deflation valve, and the deflation valve is mainly used for medium discharge in the operation process; the piston center rod assembly sequentially penetrates through the cylinder barrel assembly and the blowout flange 4, the blanking plug assembly is assembled at one end of the piston center rod assembly, which is close to the direction of the valve body 8, and the blanking plug assembly is driven by the piston center rod assembly to extend into the valve body 8; the hand wheel 15 is assembled on the piston center rod component; the transmission assembly is assembled on the cylinder barrel assembly and is arranged close to the hand wheel 15, the hand wheel 15 controls the piston central rod assembly to stretch and retract through the transmission assembly, and meanwhile, the piston central rod assembly drives the blanking plug assembly to stretch and move in a channel of the valve body 8 and realize plugging;

the blanking plug assembly comprises an iron head 7, a sealing rod 5 and a sealing rubber cylinder 16; the iron head 7 is in threaded connection with the end part of the piston central rod assembly, the sealing rod 5 is provided with an inner hole, and a sealing ring is arranged in the inner hole and is in threaded connection with the piston central rod assembly; the sealing rubber cylinder 16 is sleeved on the piston center rod component and is positioned between the iron head 7 and the sealing rod 5;

specifically, the cylinder barrel assembly comprises a cylinder barrel 1 and a cylinder barrel joint 3, the cylinder barrel joint 3 is connected to one end of the cylinder barrel 1 through threads, and the blowout flange 4 is connected to the cylinder barrel joint 3 through threads; the cylinder barrel 1 is of a hollow barrel structure, a strip-shaped key groove is formed in the inner wall of the barrel, and the piston center rod assembly penetrates through the cylinder barrel 1 and is matched with the strip-shaped key groove of the cylinder barrel 1; be equipped with the seal groove on the inner wall of cylinder joint 3, in the piston center pole subassembly runs through cylinder joint 3, and through the sealed cooperation of Y type sealing washer and seal groove, realize the sealed to piston center pole subassembly.

Specifically, well core rod subassembly includes piston rod 2 and king-rod 6 in the piston, well core rod 6 runs through and sets up in piston rod 2, 2 half polished rods of piston rod, half be the screw thread, be equipped with the screw thread on 2's the lateral wall of piston rod to be equipped with the bar keyway at screw thread portion, the inner wall of cylinder subassembly and the outer wall bar keyway cooperation of piston rod 2, the tip and the adjusting nut 10 threaded connection that piston rod 2 is close to hand wheel 15, the other end of piston rod 2 and the tip threaded connection of sealing rod 5.

The central rod 6 is a stepped rod, wherein the step section of the central rod 6 is matched with an adjusting nut 10 for controlling the blanking plug assembly. One end of the central rod 6 is in threaded connection with a locking nut 12, and the other end of the central rod 6 is in threaded connection with a sealing rubber cylinder 16 and an iron head 7 in sequence.

Specifically, the transmission assembly comprises an upper shell 13, a bearing 9, a copper nut 11 and an end cover 14; one end of the upper shell 13 is provided with internal threads for connecting with the cylinder barrel assembly; the other end of the upper shell 13 is provided with a bearing mounting hole, the end part is provided with threads, and the end cover 14 is in threaded connection with the end part of the threads of the upper shell 13; the bearing 9 and the copper nut 11 are arranged in the bearing mounting hole, the copper nut 11 is provided with a baffle table, two sides of the baffle table are used for mounting the bearing 9, the end part of the copper nut 11 is provided with an outer hexagon, the rear end of the outer hexagon is provided with an external thread, and the hand wheel is fixedly assembled on the outer hexagon through a fixing nut; the inner wall of the copper nut 11 is provided with T-shaped threads, and the piston center rod component is in threaded connection with the copper nut 11.

Specifically, the blowout flange 4 is in sealing connection with the valve body 8 through an octagonal backing steel ring 17, an inner hole is formed in the end face of the blowout flange 4, and the blanking plug assembly moves in a channel of the valve body 8 through a piston center rod assembly.

Specifically, the piston center rod assembly, the blowing flange 4, the cylinder barrel assembly, the blanking plug assembly, the hand wheel 15 and the transmission assembly are coaxially arranged.

The invention provides an assembling method of a mechanical under-pressure valve repairing device, which comprises the following steps:

firstly assembling a modifying tool, fixing a blowout flange 4, connecting a cylinder barrel joint 3 with the blowout flange 4, and connecting a cylinder barrel 1 with the cylinder barrel joint 3. The piston rod 2 penetrates through the seal of the cylinder joint 3, the key is arranged on the piston rod 2, the piston rod 2 is arranged in the cylinder 1 along the strip-shaped key groove, and the upper shell 13 of the transmission assembly is connected with the cylinder 1. The sealing rod 5 is arranged on the piston rod 2, the iron head 7 is arranged on the central rod 6, the sealing rubber tube 16 is arranged between the iron head 7 and the sealing rod 5, the adjusting nut 10 is arranged on the internal thread of the piston rod 2, and the locking nut 12 is used for locking the central rod 2. And (4) rotating the hand wheel 15 to check whether the piston rod 2 can flexibly enter and exit, and waiting for next operation preparation after the equipment is installed and checked to be correct.

The mechanical valve repairing device with pressure provided by the invention is used for tool installation and pressure test:

the assembled tool is connected with a flange of a valve to be maintained through the octagonal cushion, the device performs a hermetic seal test according to the test process requirement, the complete hermetic seal of the device is ensured, and no leakage exists at the connection part. The use method of the mechanical under-pressure valve repairing device provided by the invention comprises the following steps that:

first, the length of the failed valve is measured, the length of the stopper penetration is calculated, and the predetermined location of the packing rubber cartridge 16 penetration into the failed valve is determined. The hand wheel 15 on the modification tool is rotated clockwise to push the piston rod 2 to enter the air passage with the blockage, the sealing rubber cylinder 16 reaches a designated position, the displacement size is measured again, and after the displacement size is correct, the adjusting nut 10 is loosened, so that the gas in the valve passage pressurizes the sealing rubber cylinder 16, and the sealing rubber cylinder 16 is pushed to expand for the first time. And then, the locking nut 12 is screwed, at the moment, the locking nut 12 drives the central rod 6 to move backwards, the sealing rubber cylinder 16 is simultaneously extruded, the sealing rubber cylinder 16 is pressurized for the second time, and the preset air passage is blocked. And (4) opening a vent valve on the blowout prevention flange 4, observing the numerical value change of a pressure gauge on the blowout prevention flange, and carrying out next operation when the pressure is zero and no exhaust sound exists, continuously observing for 15 minutes and no change exists and blocking is finished.

In the plugging state, disassembling the fault valve, replacing or repairing the damaged part of the valve, such as replacing the combined seal, repairing the copper nut, repairing the screw rod and the like, recovering the disassembled part of the valve after the maintenance of the valve is finished, and carrying out the next operation after checking that the valve part is installed without errors.

Deblocking the blanking plug, loosening the locking nut 12, removing the blockage of the blocked part of the sealing rubber barrel 16, then rotating the hand wheel 15 anticlockwise, withdrawing the piston rod 2 to the starting position, closing the valve, opening the air release valve, observing the pressure gauge, and finishing the deblocking after emptying.

And (5) disassembling the valve repairing tool, recovering the on-site valve flow and cleaning the on site.

According to the invention, a T-shaped thread transmission mode is adopted, the copper nut of the transmission assembly is matched with the T-shaped thread of the piston rod through the T-shaped thread, the copper nut is driven to drive the piston rod to advance and retreat by rotating the hand wheel, the tool is simple to operate, and the operation is reliable. The position of the central rod and the position of the piston rod are controlled by the adjusting nut to control the blockage of the sealant barrel, so that the personnel for plugging and deblocking have fewer operating procedures, and the operation is simpler and more reliable. The whole length of the mechanical under-pressure valve repairing workpiece is 1 meter, the whole weight of the tool is small, and the operation is convenient for a wellhead with a narrow operation space. The valve repairing construction period is short, the influence on the productivity is small, and the valve repairing construction method is safer, more reliable and quicker.

Examples

Take the example that the commonly used gas production wellhead KQ65-70 gas production tree needs to maintain the No. 2 master control gate valve. The leakage of the No. 2 master control gate valve of the gas production tree is found seriously on site, the No. 2 master control gate valve of the wellhead needs to be maintained under pressure, the oil pressure of the wellhead is 7.2Mpa, and the sleeve pressure is 13.8 Mpa.

Firstly, preparation of construction

1. After the construction operation team arrives at the site, the safety warning area is arranged according to the requirements, and the fire-fighting emergency equipment, the safety warning board, the wind vane and the escape route board are placed and fixed according to the requirements. Personnel irrelevant to construction, site construction supervision and monitoring cannot enter a safety alert area. And putting the valve repairing tool in order, and checking the tool and equipment.

2. The field worker wears the labor protection supplies, and needs to be equipped with a safety belt during the overhead operation;

3. wellhead pressure was recorded and recorded.

4. Measurements are made in situ to determine the location of the blockage and are recorded.

5. And (5) carrying out construction safety education on constructors.

Second, the operation process

1. Preparation work

The valve repairing tool with pressure and the matched equipment are placed in order, and the tool and the equipment are checked. The valve repairing tool and the matched equipment are cleaned, and the equipment is placed neatly. And (4) completely closing the No. 2 gate valve and checking under the condition of no leakage, operating the gas production wellhead according to the gas production process flow, dismantling the upper part of the No. 2 gate valve of the gas production wellhead, and placing the gate valve at a specified position.

The face distance of the failed valve is measured, recorded, calculated and determined the depth dimension into which the piston rod is to enter.

The blowout prevention flange is arranged on the No. 2 gate valve, the tool performs an air sealing test according to the test process requirement, and the device is guaranteed to be sealed reliably and has no leakage.

2. Procedure for the preparation of the

And opening the No. 2 gate valve, rotating a hand wheel to drive the piston rod to drive the sealing rubber cylinder to reach a preset position, loosening the adjusting nut after the stroke is determined to be correct by measuring the size, pushing the center rod to move by the medium pressure of the wellhead at the moment, extruding the sealing rubber cylinder on the piston rod, and completing the expansion of the first rubber cylinder. And then the locking nut is operated to drive the central rod to extrude the sealing rubber cylinder for secondary pressurization, so that the blocking process is safer and more reliable. And opening an air release valve on the blowout prevention flange, observing the numerical value of the pressure gauge, emptying the medium in the cavity between the sealing rubber barrel and the sealing flange, observing the numerical value of the pressure gauge for 15 minutes without change, and finishing the blockage.

In a plugging state, disassembling a fault valve according to an assembly process, disassembling a damaged sealing part of the valve, replacing a new valve combined sealing part, recovering the valve after the replacement is finished, checking whether the valve sealing problem is solved or not, ensuring no leakage within 15 minutes and finishing fault maintenance.

And (5) disassembling the valve repairing tool, recovering the well mouth and cleaning the site.

In summary, the invention provides a mechanical valve repairing device with pressure, a fault valve is plugged by a valve repairing tool, the valve repairing tool is simple and compact in structure through a piston center rod assembly, a blanking plug assembly, a hand wheel and a transmission assembly, effective plugging of the fault valve can be realized, the blanking plug assembly comprises an iron head, a sealing rod and a sealing rubber cylinder, the sealing rubber cylinder of the blanking plug assembly can be secondarily sealed in the fault valve of a valve body through adjustment of the piston center rod assembly, the plugging effect on an air passage is greatly improved, meanwhile, the change of pressure in the fault valve can be visually observed through a blowing flange, and the danger caused by abnormal gas pressure in the operation process is avoided.

The invention provides a using method of a mechanical under-pressure valve repairing device, which reduces field operators and operation steps. 2 operators are needed on site to complete the valve repair under pressure. The hand wheel drives the lead screw to mechanically drive the piston rod, so that the blanking plug can enter a designated position. The field personnel only need confirm the blanking plug and get into the degree of depth, then operate the hand wheel, and the blanking plug gets into predetermined position after, the shutoff blanking plug, and inspection sealing reliability maintains the valve damage portion as required, obviously promotes in work efficiency and security.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.