Axial pressure control plugging device for borehole operation shaft

Abstract

The invention relates to the technical field of wellbore plugging devices, in particular to a downhole operation wellbore axial pressure control plugging device which comprises a bottom flange, a supporting pipe, a middle flange plate, a telescopic part, an upper floating plate, a lower floating plate, a hinge assembly and a sealing part, the supporting pipe is fixedly installed on the upper side of the inner end of the bottom flange, and the middle flange plate is fixedly installed on the outer side of the right end of the supporting pipe; a lower floating plate is arranged on the middle flange plate, an upper floating plate is arranged above the lower floating plate, and penetrating holes allowing oil pipes to penetrate through are formed in the middle of the upper floating plate and the middle of the lower floating plate. The device is reasonable and compact in structure and convenient to use, the hinge assembly and the sealing piece are installed on the movable upper floating plate and the movable lower floating plate, the hinge assembly can push the sealing piece to seal the oil pipe when the elevator and the oil pipe are pressed downwards by weight, then liquid level detection is conducted, and when the elevator does not press the telescopic piece downwards any more, the telescopic piece can push the upper floating plate to move upwards. And the oil pipe can be automatically loosened and plugged according to the state of the elevator.

Description

Technical Field

[0001] The invention relates to the technical field of wellbore plugging devices, in particular to an axial pressure-controlled plugging device for a wellbore for underground operations. Background Art

[0002] Conventional oil well downhole operations are all conducted in an open-top mode. Monitoring the wellbore pressure liquid level data during the downhole operation of the oil well is extremely important for well control safety. If the dynamic downhole liquid level is to be monitored during the entire operation, the acoustic wave liquid level detection technology used can only be successfully detected in a closed environment. Therefore, the wellhead needs to be sealed, otherwise the sound waves will escape from the wellhead and the dynamic downhole liquid level cannot be detected. The key to successfully detecting the liquid level is to use an economical, safe and reliable wellhead sealing method. During downhole operations, the casing annulus is closed during the process of lifting and lowering the sucker rod, and there is no need to consider it; during the process of lifting and lowering the tubing, it is difficult to close the wellhead when the tubing moves up and down. The dynamic liquid level detection can be selected during the relative stillness of the tubing elevator sitting on the blowout preventer. It is only necessary to keep the wellhead sealed during this test period. A downhole operation wellbore axial pressure capping device is developed to realize the dynamic liquid level monitoring during the oil well operation process. Summary of the invention

[0003] The present invention provides an axial pressure-controlled plugging device for underground operation wellbore, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that when the existing oil pipe moves up and down and the wellhead is in an open state, sound waves will escape from the wellhead when detecting the liquid level, making it impossible to detect the dynamic liquid level underground.

[0004] The technical solution of the present invention is achieved through the following measures: an axial pressure-controlled plugger for an underground wellbore, comprising a bottom flange, a support tube, a middle flange plate, a telescopic member, an upper floating plate, a lower floating plate, a hinged assembly and a sealing member, wherein a support tube is fixedly installed on the upper side of the inner end of the bottom flange, a middle flange plate is fixedly installed on the outer side of the right end of the support tube, a lower floating plate is arranged on the middle flange plate, an upper floating plate is arranged above the lower floating plate, through holes are arranged in the middle of the upper floating plate and the lower floating plate for oil pipes to pass through, at least two groups of hinged assemblies are arranged between the upper floating plate and the lower floating plate, each group of hinged assemblies is connected to a sealing member, the hinged assembly can push the sealing member to move inward to seal the oil pipe, the upper end of the telescopic member passes through the middle flange plate and the lower floating plate in sequence from bottom to top, and the upper part of the telescopic member can support the upper floating plate.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned can also include a middle flange tube, an upper anti-smashing flange plate, and an upper flange tube. The middle flange tube is integrally provided on the upper right end of the middle flange plate, an upper anti-smashing flange plate is provided above the middle flange tube, and an upper flange tube is integrally provided on the lower right end of the upper anti-smashing flange plate and is mounted on the outside of the middle flange tube.

[0006] The telescopic member can be a cylinder, the lower part of which is located between the bottom flange and the middle flange plate, and the extended end of the cylinder passes through the middle flange and the lower floating plate from bottom to top and then abuts against the lower side of the upper anti-smashing flange plate.

[0007] Two groups of cylinders can be evenly distributed along the circumference of the lower floating plate. The positions of the cylinders and the hinge components are staggered. The upper floating plate and the lower floating plate corresponding to each cylinder position are provided with special-shaped openings that penetrate up and down.

[0008] A circular support plate can be fixedly mounted on the outer side of the upper part of the extended end of the cylinder, and the cylinder can support the upper floating plate through the circular support plate.

[0009] The above-mentioned hinge assembly may include an upper hinge seat, an upper hinge arm, a lower hinge arm, a lower hinge seat, and a sealed hinge seat. The upper hinge seat and the lower hinge seat are respectively installed at corresponding positions on the lower side of the upper floating plate and the upper side of the lower floating plate. The upper hinge arm is hinged on the upper hinge seat, and the lower hinge arm is hinged on the lower hinge seat. The middle part of the lower hinge arm is hinged to the lower end of the upper hinge arm, and the left end of the lower hinge arm is hinged to the seal through the sealed hinge seat.

[0010] The above-mentioned sealing member can be a sealing ring. Four groups of hinge components are evenly distributed along the circumference between the upper floating plate and the lower floating plate. The sealing hinge seats on each group of hinge components are fixedly installed with the sealing rings at the corresponding positions respectively, and the sealing rings on the four groups of hinge components can form a circle.

[0011] A horn with an opening facing upward may be provided on the upper side of the inner end of the lower floating plate, and the horn can be sealed with the sealing ring.

[0012] The lower side of the bottom flange may be provided with at least two trapezoidal steel ring sealing grooves and four oblong screw holes evenly distributed along the circumference.

[0013] The present invention has a reasonable and compact structure and is easy to use. It installs hinge components and seals by arranging movable upper floating plates and lower floating plates. When the weight of the elevator and the oil pipe presses down, the hinge components can push the seals to seal the oil pipe, thereby performing liquid level detection. When the elevator no longer presses down the telescopic component, the telescopic component can push the upper floating plate upward to unseal the seals and the oil pipe, and the oil pipe can be automatically loosened and sealed according to the state of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the front half-section structure of the embodiment of the present invention when compressed.

[0015] Attached Figure 2 It is a schematic diagram of the elongated front cross-sectional structure of the present invention.

[0016] Attached Figure 3 For attachment Figure 1 Schematic diagram of the main cross-sectional enlarged structure of the middle hinge assembly.

[0017] Attached Figure 4 For attachment Figure 1 Schematic diagram of the top view of the middle and lower floating plates.

[0018] Attached Figure 5 For attachment Figure 1 Schematic diagram of the structure of the upper middle floating plate from above.

[0019] Attached Figure 6 For attachment Figure 1 Schematic diagram of the main structure of the middle cylinder.

[0020] The codes in the accompanying drawings are: 1 is an upper anti-smash flange plate, 2 is a cylinder telescopic rod, 3 is an upper flange tube, 4 is a middle flange tube, 5 is a middle flange plate, 6 is a support pipe, 7 is an air supply pipe, 8 is a cylinder, 9 is a bottom flange, 10 is an oil pipe, 11 is a hanging card, 12 is an upper floating plate, 13 is a sealing hinge seat, 14 is a sealing ring, 15 is an upper hinge seat, 16 is an upper hinge arm, 17 is a lower hinge arm, 18 is a lower hinge seat, 19 is a lower floating plate, 20 is a trapezoidal steel ring sealing groove, 21 is a circular support plate, 22 is a horn tube, 23 is a through hole, and 24 is a special-shaped opening. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown in Figures 3, 4, 5 and 6, the downhole operation wellbore axial pressure-controlled plugging device includes a bottom flange 9, a support tube 6, a middle flange plate 5, a telescopic member, an upper floating plate 12, a lower floating plate 19, a hinge assembly and a sealing member. The support tube 6 is fixedly installed on the upper inner end of the bottom flange 9, and the middle flange plate 5 is fixedly installed on the outer right end of the support tube 6. A lower floating plate 19 is arranged on the middle flange plate 5, and an upper floating plate 12 is arranged above the lower floating plate 19. A through hole 23 is provided in the middle of the upper floating plate 12 and the lower floating plate 19 for allowing the oil pipe 10 to pass through. At least two groups of hinge assemblies are provided between the upper floating plate 12 and the lower floating plate 19, and a sealing member is connected to each group of hinge assemblies. The hinge assembly can push the sealing member to move inward to seal the oil pipe 10. The upper end of the telescopic member passes through the middle flange plate 5 and the lower floating plate 19 from bottom to top in sequence, and the upper part of the telescopic member can support the upper floating plate 12.

[0024] According to the requirements, the telescopic member adopts the existing known technology, such as cylinder 8 or airbag. When in use, the oil pipe 10 passes through the bottom flange 9, the support pipe 6, the middle flange plate 5, the lower floating plate 19, and the upper floating plate 12. When the oil pipe 10 elevator 11 is placed on the blowout preventer and the weight of the elevator 11 and the oil pipe 10 presses down the telescopic member, pushing the upper floating plate 12 to move down. When the upper floating plate 12 moves down, it drives the hinge assembly to extend inward, pushing the seal to seal with the oil pipe 10, so as to seal the wellhead. Then, a liquid level detector is used to dynamically monitor the downhole liquid level. When the elevator 11 no longer presses down the telescopic member, the telescopic member extends upward, driving the upper floating plate 12 to move up, stretching the hinge assembly upward and outward, so that the seal is separated from the oil pipe 10. When the hinge assembly is active, the upper floating plate 12 and the lower floating plate 19 can move radially, and automatically seal and automatically unseal according to the state of the oil pipe 10, so as to facilitate dynamic monitoring of the liquid level.

[0025] According to actual needs, the above-mentioned downhole operation wellbore axial pressure-controlled plugging device can be further optimized and / or improved: Embodiment 2: As attached Figure 1 , 2 As shown, it also includes a middle flange tube 4, an upper anti-smashing flange plate 1, and an upper flange tube 3. The middle flange tube 4 is integrally provided on the upper right end of the middle flange plate 5, an upper anti-smashing flange plate 1 is provided above the middle flange tube 4, and an upper flange tube 3 is integrally provided on the lower right end of the upper anti-smashing flange plate 1 and is sleeved on the outside of the middle flange tube 4.

[0026] The outer side of the middle flange tube 4 and the inner side of the upper flange tube 3 are matched with a certain clearance, which plays the role of protection, axial guide and limit.

[0027] Embodiment 3: As attached Figure 1 , 2 As shown, the telescopic member is a cylinder 8, the lower part of which is located between the bottom flange 9 and the middle flange plate 5, and the extended end of the cylinder 8 passes through the middle flange and the lower floating plate 19 from bottom to top and then abuts against the lower side of the upper anti-smashing flange plate 1.

[0028] The cylinder 8 or airbag is used as a variable volume sealed component. When the upper anti-smashing flange plate 1 is subjected to the pressure of the oil pipe 10, it will be compressed to increase the internal gas pressure, that is, the wellhead plugging completion signal is transmitted to the dynamic liquid level monitoring system through the air supply pipe 7. When the oil pipe 10 lifts the axial pressure-controlled plugger without pressure, the cylinder 8 or airbag component acts as a spring to return the axial pressure-controlled plugger to its original position, and the internal pressure of the cylinder 8 or airbag component returns to the initial value. Such a cylinder 8 or airbag variable volume sealed component plays the dual role of sensing pressure and spring, and also has explosion-proof characteristics.

[0029] Embodiment 4: As attached Figure 5As shown, two groups of cylinders 8 are evenly distributed along the circumference of the lower floating plate 19, and the positions of the cylinders 8 and the hinge assembly are staggered. The upper floating plate 12 and the lower floating plate 19 corresponding to each position of the cylinder 8 are provided with a special-shaped opening 24 that passes through from top to bottom. The special-shaped opening 24 is provided so that not only the extended end of the cylinder 8 can pass through, but also the upper floating plate 12 and the lower floating plate 19 can move. When the hinge assembly moves, the upper floating plate and the lower floating plate 19 can be pushed to move and rotate without falling out from the extended end of the cylinder 8. When the oil pipe 10 deviates, the hinge assembly and the upper and lower floating plates 19 can be sealed accordingly, ensuring that the oil pipe 10 can be tightly sealed even when it deviates.

[0030] Embodiment 5: As attached Figure 6 As shown, a circular support plate 21 is fixedly mounted on the outer side of the upper portion of the extended end of the cylinder 8 , and the cylinder 8 can support the upper floating plate 12 through the circular support plate 21 .

[0031] The upper floating plate 12 is supported by the circular support plate 21 and ensured to be able to move and rotate radially.

[0032] Embodiment 6: As attached Figure 3 As shown, the hinge assembly includes an upper hinge seat 15, an upper hinge arm 16, a lower hinge arm 17, a lower hinge seat 18, and a sealed hinge seat 13. The upper hinge seat 15 and the lower hinge seat 18 are respectively installed at corresponding positions on the lower side of the upper floating plate 12 and the upper side of the lower floating plate 19. The upper hinge arm 16 is hinged on the upper hinge seat 15, and the lower hinge arm 17 is hinged on the lower hinge seat 18. The middle part of the lower hinge arm 17 is hinged to the lower end of the upper hinge arm 16, and the left end of the lower hinge arm 17 is hinged to the seal through the sealed hinge seat 13.

[0033] When the elevator 11 presses down the anti-smashing flange plate 1, the compression cylinder 8 and the upper floating plate 12 move downward, and the upper floating plate 12 pushes the upper hinge arm 16 to extend inward and then pushes the lower hinge arm 17 to extend inward and move downward, pushing the seal inward and moving downward to seal the oil pipe 10, completing the wellhead plugging action.

[0034] Embodiment 7: As attached Figure 1 , 2 As shown in Figure 3, the sealing member is a sealing ring 14. Four sets of hinge components are evenly distributed along the circumference between the upper floating plate 12 and the lower floating plate 19. The sealing hinge seats 13 on each set of hinge components are fixedly installed with the sealing rings 14 at the corresponding positions, and the sealing rings 14 on the four sets of hinge components can form a circle.

[0035] The four sealing rings 14 are respectively mounted on the four sets of hinge assemblies. When the hinge assemblies extend inwards, the four sealing rings 14 can be simultaneously pushed inwards to seal the oil pipe 10 .

[0036] Embodiment 8: As attached Figure 1 , 2As shown in FIG. 3 , a trumpet 22 with an opening facing upward is provided on the upper inner side of the lower floating plate 19, and the trumpet 22 can seal with the sealing ring 14. When the elevator 11 is pressed down, the sealing ring 14 moves downward along with the hinge assembly while sealing the oil pipe 10. When the sealing ring 14 moves to the lower end position, its outer side can contact with the inner wall of the trumpet 22 to form a seal, thereby preventing oil and gas in the wellbore from entering the hinge assembly and protecting the hinge assembly.

[0037] Embodiment 9: As attached Figure 4 As shown, at least two trapezoidal steel ring sealing grooves 20 and four oblong screw holes evenly distributed along the circumference are provided on the lower side of the bottom flange 9. Three trapezoidal steel ring sealing grooves 20 are provided on the lower side of the bottom flange 9 to adapt to the docking of conventional blowout preventers of different specifications.

[0038] The effects of the present invention are as follows: 1. When the elevator 11 of the oil pipe 10 is pressed on the present invention, the characteristics of the oil well operation process are utilized to provide an effective and timely plugging and sealing effect on the wellhead, creating necessary conditions for the successful detection of the dynamic liquid level. When the elevator 11 of the oil pipe 10 leaves the axial pressure-controlled plugging device, the plugging and sealing are automatically released, effectively solving the problem of frequent replacement of the plugging and sealing ring 14 due to wear and failure; 2. The internal mobile plugging and sealing system of the present invention can move radially with the oil pipe 10 as the center, solving the problem that the eccentric wear of the oil pipe 10 affects the sealing effect. 3. The symmetrically arranged cylinder 8 is used as a gas spring, which can restore the upper anti-smash plate to its initial position and provide a pressure increase change signal for the dynamic liquid level monitoring system, providing conditions for the dynamic liquid level monitoring system to automatically start detection at an appropriate time, and has explosion-proof characteristics that can adapt to on-site conditions; 4. The present invention is installed on the wellhead blowout preventer, replacing the original anti-smash plate and providing corresponding functions; the original constant pressure air supply pipe 7 of the dynamic liquid level monitoring system is used as a pressure change signal transmission carrier, which develops the potential functions of the existing equipment and simplifies the system structure for easy installation and docking.

[0039] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An axial pressure-controlled plugging device for underground operation wellbore, characterized in that It includes a bottom flange, a supporting tube, a middle flange plate, a telescopic part, an upper floating plate, a lower floating plate, a hinged assembly and a sealing part. A supporting tube is fixedly installed on the upper inner end of the bottom flange, a middle flange plate is fixedly installed on the outer right end of the supporting tube, a lower floating plate is arranged on the middle flange plate, an upper floating plate is arranged above the lower floating plate, through holes are arranged in the middle of the upper floating plate and the lower floating plate for the oil pipe to pass through, at least two groups of hinged assemblies are arranged between the upper floating plate and the lower floating plate, each group of hinged assemblies is connected with a sealing part, the hinged assembly can push the sealing part to move inward to seal the oil pipe, the upper end of the telescopic part passes through the middle flange plate and the lower floating plate from bottom to top in sequence, and the upper part of the telescopic part can support the upper floating plate.

2. The downhole operation wellbore axial pressure-controlled plugging device according to claim 1 is characterized in that It also includes a middle flange tube, an upper anti-smashing flange plate, and an upper flange tube. The middle flange tube is integrally provided on the upper right end of the middle flange plate, an upper anti-smashing flange plate is provided above the middle flange tube, and an upper flange tube is integrally provided on the lower right end of the upper anti-smashing flange plate and is mounted on the outer side of the middle flange tube.

3. The downhole operation wellbore axial pressure-controlled plugging device according to claim 2 is characterized in that The telescopic part is a cylinder, the lower part of which is located between the bottom flange and the middle flange plate, and the extended end of the cylinder passes through the middle flange and the lower floating plate from bottom to top in sequence and then abuts against the lower side of the upper anti-smashing flange plate.

4. The downhole operation wellbore axial pressure-controlled plugging device according to claim 3 is characterized in that Two groups of cylinders are evenly distributed along the circumference of the lower floating plate. The positions of the cylinders and the hinged components are staggered. The upper floating plate and the lower floating plate corresponding to each cylinder position are provided with special-shaped openings that penetrate up and down.

5. The downhole operation wellbore axial pressure-controlled plugging device according to claim 3 or 4, characterized in that A circular supporting plate is fixedly installed on the outer side of the upper part of the extended end of the cylinder, and the cylinder can support the upper floating plate through the circular supporting plate.

6. The downhole operation wellbore axial pressure-controlled plugging device according to claim 1, 2, 3 or 4, characterized in that The hinge assembly includes an upper hinge seat, an upper hinge arm, a lower hinge arm, a lower hinge seat, and a sealed hinge seat. The upper hinge seat and the lower hinge seat are respectively installed at corresponding positions on the lower side of the upper floating plate and the upper side of the lower floating plate. The upper hinge arm is hinged on the upper hinge seat, and the lower hinge arm is hinged on the lower hinge seat. The middle part of the lower hinge arm is hinged to the lower end of the upper hinge arm, and the left end of the lower hinge arm is hinged to the seal through the sealed hinge seat.

7. The downhole operation wellbore axial pressure-controlled plugging device according to claim 5, characterized in that The hinge assembly includes an upper hinge seat, an upper hinge arm, a lower hinge arm, a lower hinge seat, and a sealed hinge seat. The upper hinge seat and the lower hinge seat are respectively installed at corresponding positions on the lower side of the upper floating plate and the upper side of the lower floating plate. The upper hinge arm is hinged on the upper hinge seat, and the lower hinge arm is hinged on the lower hinge seat. The middle part of the lower hinge arm is hinged to the lower end of the upper hinge arm, and the left end of the lower hinge arm is hinged to the seal through the sealed hinge seat.

8. The downhole operation wellbore axial pressure-controlled plugging device according to claim 6, characterized in that The seal is a sealing ring. Four sets of hinge components are evenly distributed along the circumference between the upper floating plate and the lower floating plate. The sealing hinge seats on each set of hinge components are fixedly installed with the sealing rings at the corresponding positions respectively, and the sealing rings on the four sets of hinge components can form a circle.

9. The downhole operation wellbore axial pressure-controlled plugging device according to claim 7, characterized in that The seal is a sealing ring. Four sets of hinged components are evenly distributed along the circumference between the upper floating plate and the lower floating plate. The sealing hinge seat and the sealing ring on each set of hinged components are fixedly installed together, and the sealing rings on the four sets of hinged components can form a circle.

10. The downhole operation wellbore axial pressure-controlled plugging device according to claim 8 or 9, characterized in that A horn with an upward opening is provided on the upper inner end of the lower floating plate, and the horn can be sealed with the sealing ring; or / and, at least two trapezoidal steel ring sealing grooves and four oblong screw holes evenly distributed along the circumference are provided on the lower side of the bottom flange.

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