Downhole servicing wellbore axial pressure-controlled packer

Abstract

The present application relates to the technical fields of wellbore plugging device, and is a downhole operation wellbore axial pressure control plugging device, which comprises a bottom flange, a support pipe, a middle flange plate, an expansion piece, an upper floating plate, a lower floating plate, a hinged assembly and a sealing piece, the support pipe is fixedly installed on the upper side of the inner end of the bottom flange, the middle flange plate is fixedly installed on the outer side of the right end of the support pipe, the lower floating plate is arranged on the middle flange plate, the upper floating plate is arranged above the lower floating plate, and the upper floating plate and the lower floating plate are both provided with through holes through which the oil pipe can pass. The present application has reasonable and compact structure and is convenient to use, the hinged assembly and the sealing piece are installed by setting the movable upper floating plate and the lower floating plate, the hinged assembly can push the sealing piece to seal the oil pipe under the weight of the elevator and the oil pipe, and then the liquid level detection is carried out, when the elevator no longer presses the expansion piece, the expansion piece can push the upper floating plate to move upwards, so that the sealing piece is unsealed from the oil pipe, and the oil pipe can be automatically loosened and sealed according to the state of the elevator.

Description

Technical Field

[0001] This invention relates to the field of wellbore plugging device technology, and is a downhole wellbore axial pressure control plugging device. Background Technology

[0002] Conventional oil well downhole operations typically employ an open-hole operation mode. Monitoring wellbore fluid level data during downhole operations is crucial for well control safety. To achieve dynamic monitoring of the downhole fluid level throughout the entire operation, acoustic wave fluid level detection technology can only be successfully applied in a closed environment. Therefore, the wellhead must be sealed; otherwise, acoustic waves will escape from the wellhead, making it impossible to detect the downhole fluid level. Adopting an economical, safe, and reliable wellhead sealing method is key to successful fluid level detection. During downhole operations, the casing annulus is closed during sucker rod lifting and does not require consideration. However, sealing the wellhead is difficult during tubing lifting and lowering, as the tubing is moving up and down. Dynamic fluid level detection can be performed during the relatively static period when the tubing clamp is detached from the blowout preventer. It is only necessary to keep the wellhead sealed during this testing period. Developing a downhole wellbore axial pressure sealing device can enable dynamic fluid level monitoring during oil well operations. Summary of the Invention

[0003] This invention provides an axial pressure-controlled plugging device for downhole operations, which overcomes the shortcomings of the prior art. It can effectively solve the problem that when the wellhead is open during the up-and-down movement of the tubing, the sound waves will escape from the wellhead and fail to detect the downhole fluid surface.

[0004] The technical solution of the present invention is achieved through the following measures: A downhole wellbore axial pressure control plugging device includes a bottom flange, a support pipe, a middle flange plate, a telescopic component, an upper floating plate, a lower floating plate, a hinge assembly, and a sealing component. The support 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 support pipe. The middle flange plate is provided with a lower floating plate, and the upper floating plate is provided above the lower floating plate. Both the upper and lower floating plates are provided with through holes in the middle to allow the tubing to pass through. At least two sets of hinge assemblies are provided between the upper and lower floating plates. Each set of hinge assemblies is connected to a sealing component. The hinge assembly can push the sealing component to move inward to seal the tubing. The upper end of the telescopic component passes through the middle flange plate and the lower floating plate from bottom to top, and the upper part of the telescopic component can support the upper floating plate.

[0005] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0006] The above may also include a middle flange cylinder, an upper anti-smashing flange plate, and an upper flange cylinder. The middle flange cylinder is integrally provided on the upper right side of the middle flange plate, the upper anti-smashing flange plate is provided above the middle flange cylinder, and the upper flange cylinder is integrally provided on the lower right side of the upper anti-smashing flange plate and fitted on the outside of the middle flange cylinder.

[0007] The aforementioned telescopic component can be a cylinder. The lower part of the cylinder is located between the bottom flange and the middle flange plate. 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.

[0008] Two sets of cylinders can be evenly distributed along the circumference of the lower floating plate. The positions of the cylinders and the hinge assembly are staggered. Corresponding to the position of each cylinder, the upper and lower floating plates are provided with irregularly shaped openings that run vertically through each other.

[0009] A circular support plate can be fixedly installed on the upper outer side of the extended end of the cylinder, and the cylinder can support the floating plate through the circular support plate.

[0010] The aforementioned hinge assembly may include an upper hinge seat, an upper hinge arm, a lower hinge arm, a lower hinge seat, and a sealing 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 to the upper hinge seat, and the lower hinge arm is hinged to 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 sealing hinge seat.

[0011] The aforementioned sealing element can be a sealing ring. Four sets of hinge components are evenly distributed along the circumference between the upper and lower floating plates. The sealing hinge seat on each set of hinge components is fixedly installed with the sealing ring at the corresponding position. The sealing rings on the four sets of hinge components can form a circle.

[0012] The upper inner end of the aforementioned lower floating plate may be provided with an upward-opening horn, which can be sealed with a sealing ring.

[0013] The bottom flange may be provided with at least two trapezoidal steel ring sealing grooves and four elongated bolt holes evenly distributed along the circumference.

[0014] The present invention has a reasonable and compact structure and is easy to use. It uses movable upper and lower floating plates to install hinge components and seals. When the weight of the hanger and the oil pipe presses down, the hinge components can push the seals to seal the oil pipe, thereby enabling liquid level detection. When the hanger stops pressing down on the telescopic component, the telescopic component can push the upper floating plate to move up, so that the seals are released from the oil pipe. It can automatically loosen and seal the oil pipe according to the hanger status. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the front half-section structure of an embodiment of the present invention when compressed.

[0016] Appendix Figure 2 This is a schematic diagram of the elongated front sectional structure of the present invention.

[0017] Appendix Figure 3 For the appendix Figure 1 Enlarged front view sectional view of the hinge assembly.

[0018] Appendix Figure 4 For the appendix Figure 1 A top view of the structure of the lower floating plate.

[0019] Appendix Figure 5 For the appendix Figure 1 A schematic diagram of the upper floating plate from below.

[0020] Appendix Figure 6 For the appendix Figure 1 A schematic diagram of the main structure of the middle cylinder.

[0021] The codes in the attached diagram are as follows: 1 is the upper anti-smashing flange plate, 2 is the cylinder telescopic rod, 3 is the upper flange cylinder, 4 is the middle flange cylinder, 5 is the middle flange plate, 6 is the support pipe, 7 is the air supply pipe, 8 is the cylinder, 9 is the bottom flange, 10 is the oil pipe, 11 is the lifting clamp, 12 is the upper floating plate, 13 is the sealing hinge seat, 14 is the sealing ring, 15 is the upper hinge seat, 16 is the upper hinge arm, 17 is the lower hinge arm, 18 is the lower hinge seat, 19 is the lower floating plate, 20 is the trapezoidal steel ring sealing groove, 21 is the circular support plate, 22 is the trumpet cylinder, 23 is the through hole, and 24 is the irregular opening. Detailed Implementation

[0022] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0023] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0024] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0025] Example 1: As shown in the attached document Figure 1 , 2As shown in Figures 3, 4, 5, and 6, the downhole axial pressure control plugging device includes a bottom flange 9, a support pipe 6, a middle flange plate 5, a telescopic component, an upper floating plate 12, a lower floating plate 19, a hinge assembly, and a sealing component. The support pipe 6 is fixedly installed on the upper side of the inner end of the bottom flange 9, and the middle flange plate 5 is fixedly installed on the outer side of the right end of the support pipe 6. The lower floating plate 19 is provided on the middle flange plate 5, and the upper floating plate 12 is provided above the lower floating plate 19. Both the upper floating plate 12 and the lower floating plate 19 have through holes 23 in the middle that allow the tubing 10 to pass through. At least two sets of hinge assemblies are provided between the upper floating plate 12 and the lower floating plate 19. Each set of hinge assemblies is connected to a sealing component. The hinge assembly can push the sealing component to move inward to seal the tubing 10. The upper end of the telescopic component passes through the middle flange plate 5 and the lower floating plate 19 from bottom to top, and the upper part of the telescopic component can support the upper floating plate 12.

[0026] Depending on the requirements, the telescopic component adopts existing known technologies, such as cylinder 8 or airbag. During use, tubing 10 passes through bottom flange 9, support pipe 6, middle flange plate 5, lower floating plate 19, and upper floating plate 12. When tubing 10 hanger 11 is seated on the blowout preventer shackle, the weight of hanger 11 and tubing 10 presses down on the telescopic component, pushing the upper floating plate 12 downwards. As the upper floating plate 12 moves downwards, it causes the hinge assembly to extend inwards, pushing the seal against the tubing 10, thus sealing the wellhead. Next, a fluid level detector is used for dynamic monitoring of the downhole fluid level. When hanger 11 no longer presses down on the telescopic component, it extends upwards, causing the upper floating plate 12 to move upwards, pulling the hinge assembly upwards and outwards, thus disengaging the seal from the tubing 10. When the hinge assembly moves, the upper floating plate 12 and lower floating plate 19 can move radially, repeatedly automatically sealing and unsealing according to the condition of tubing 10, facilitating dynamic fluid level monitoring.

[0027] The above-mentioned downhole axial pressure control plugging device can be further optimized and / or improved according to actual needs:

[0028] Example 2: As shown in the attached document Figure 1 , 2 As shown, it also includes a middle flange cylinder 4, an upper anti-smashing flange plate 1, and an upper flange cylinder 3. The middle flange cylinder 4 is integrally provided on the upper right side of the middle flange plate 5. The upper anti-smashing flange plate 1 is provided above the middle flange cylinder 4. The upper flange cylinder 3, which is fitted onto the outside of the middle flange cylinder 4, is integrally provided on the lower right side of the upper anti-smashing flange plate 1.

[0029] The outer side of the middle flange 4 and the inner side of the upper flange 3 are fitted with a certain clearance to provide protection, guide the axial direction, and limit movement.

[0030] Example 3: As shown in the attached document Figure 1 , 2As shown, the telescopic component is a cylinder 8. The lower part of the cylinder 8 is located between the bottom flange 9 and the middle flange plate 5. 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.

[0031] The cylinder 8 or airbag acts as a variable-volume sealing component. When the upper anti-smashing flange 1 is subjected to pressure from the tubing 10, it compresses, increasing the internal gas pressure, which is the signal that the wellhead sealing is complete. This signal is transmitted to the dynamic fluid level monitoring system via the air supply pipe 7. When the tubing 10 is lifted and the axial pressure-controlled plug is no longer under pressure, the cylinder 8 or airbag component acts as a spring, causing the axial pressure-controlled plug to return to its original position, and the internal pressure of the cylinder 8 or airbag component returns to its initial value. This variable-volume sealing component, consisting of cylinder 8 or airbag, serves the dual functions of pressure sensing and spring operation, and also possesses explosion-proof characteristics.

[0032] Example 4: As shown in the appendix Figure 5 As shown, two sets of cylinders 8 are evenly distributed along the circumference of the lower floating plate 19. The positions of the cylinders 8 and the hinge assembly are staggered. Corresponding to each position of the cylinder 8, the upper floating plate 12 and the lower floating plate 19 are provided with irregularly shaped openings 24 that pass through vertically. By setting the irregularly shaped openings 24, not only can the protruding ends of the cylinders 8 pass through, but also the upper floating plate 12 and the lower floating plate 19 are provided with room for movement. When the hinge assembly moves, it can push the upper floating plate and the lower floating plate 19 to move and rotate without dislodging from the protruding ends of the cylinders 8. This can meet the requirement that the hinge assembly and the upper and lower floating plates 19 follow the seal when the oil pipe 10 is offset, ensuring that the oil pipe 10 can still be sealed tightly when offset.

[0033] Example 5: As shown in the attached document Figure 6 As shown, a circular support plate 21 is fixedly installed on the outer side of the upper part of the extended end of the cylinder 8, and the cylinder 8 can support the floating plate 12 through the circular support plate 21.

[0034] The upper floating plate 12 is supported by a circular support plate 21, ensuring that the upper floating plate 12 can move radially and rotate.

[0035] Example 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 sealing 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 to the upper hinge seat 15, and the lower hinge arm 17 is hinged to 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 sealing hinge seat 13.

[0036] When the lifting clamp 11 presses down on the upper anti-smashing flange 1, the compression cylinder 8 and the upper floating plate 12 move down. The upper floating plate 12 pushes the upper hinge arm 16 to extend inward, which in turn pushes the lower hinge arm 17 to extend inward and move downward, pushing the sealing element inward and moving the sealing oil pipe 10 downward, thus completing the wellhead sealing action.

[0037] Example 7: As attached Figure 1 , 2 As shown in Figure 3, the sealing element 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 seat 13 on each set of hinge components is fixedly installed together with the sealing ring 14 at the corresponding position. The sealing rings 14 on the four sets of hinge components can form a circle.

[0038] Four sealing rings 14 are respectively installed on four sets of hinge assemblies. When the hinge assembly extends inward, it can simultaneously push the four sealing rings 14 inward to block the oil pipe 10 around.

[0039] Example 8: As attached Figure 1 , 2 As shown in Figure 3, the upper inner end of the lower floating plate 19 is provided with an upward-opening trumpet-shaped tube 22, which can seal with the sealing ring 14. When the lifting clamp 11 is pressed down, the sealing ring 14 moves down 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 the inner wall of the trumpet-shaped tube 22 to form a seal, preventing oil and gas in the wellbore from entering the hinge assembly and protecting the hinge assembly.

[0040] Example 9: As attached Figure 4 As shown, the bottom flange 9 has at least two trapezoidal steel ring sealing grooves 20 and four elongated oval bolt holes evenly distributed along the circumference on its lower side. The bottom flange 9 also has three trapezoidal steel ring sealing grooves 20 on its lower side to accommodate the docking of conventional blowout preventers of different specifications.

[0041] The advantages of this invention are as follows: 1. When the clamp 11 of the suspended tubing 10 is pressed against the invention, it can provide effective and timely sealing at the wellhead by utilizing the characteristics of the oil well operation process, creating the necessary conditions for successful dynamic fluid level detection. When the clamp 11 of the suspended tubing 10 leaves the axial pressure control plug, the sealing is automatically released, effectively solving the problem of frequent replacement due to wear and failure of the sealing ring 14; 2. The movable sealing system inside the invention can move radially around the tubing 10, solving the problem of eccentricity and wear of the tubing 10 affecting the sealing effect. Question 3: The symmetrically arranged cylinder 8 acts as a gas spring, which can restore the upper anti-smashing plate to its initial position and provide a pressure increase signal for the dynamic fluid level monitoring system, providing conditions for the dynamic fluid level monitoring system to automatically start detection at the appropriate time, and has explosion-proof characteristics to adapt to the site conditions; Question 4: This invention is installed on the wellhead blowout preventer, replacing the original anti-smashing plate and providing the corresponding functions; it utilizes the original constant pressure air supply pipe 7 of the dynamic fluid level monitoring system as the pressure change signal transmission carrier, develops the potential functions of the existing equipment, simplifies the system structure, and facilitates installation and docking.

[0042] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A downhole wellbore axial pressure control plugging device, characterized in that... It includes a bottom flange, a support pipe, a middle flange plate, a telescopic component, an upper floating plate, a lower floating plate, a hinge assembly, and a seal. The support 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 support pipe. The middle flange plate has a lower floating plate, and the upper floating plate is located above the lower floating plate. Both the upper and lower floating plates have through holes in the middle that allow the oil pipe to pass through. At least two sets of hinge assemblies are provided between the upper and lower floating plates. Each set of hinge assemblies is connected to a seal. The hinge assembly can push the seal to move inward to seal the oil pipe. The upper end of the telescopic component passes through the middle flange plate and the lower floating plate from bottom to top, and the upper part of the telescopic component can support the upper floating plate.

2. The downhole axial pressure control plugging device according to claim 1, characterized in that... It also includes a middle flange cylinder, an upper anti-smashing flange plate, and an upper flange cylinder. The middle flange cylinder is integrally provided on the upper right side of the middle flange plate, the upper anti-smashing flange plate is provided above the middle flange cylinder, and the upper flange cylinder is integrally provided on the lower right side of the upper anti-smashing flange plate and fitted on the outside of the middle flange cylinder.

3. The downhole wellbore axial pressure control plugging device according to claim 2, characterized in that... The telescopic component is a cylinder. The lower part of the cylinder is located between the bottom flange and the middle flange plate. 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.

4. The downhole wellbore axial pressure control plugging device according to claim 3, characterized in that... Two sets of cylinders are evenly distributed along the circumference of the lower floating plate. The positions of the cylinders and the hinge assembly are staggered. Corresponding to the position of each cylinder, the upper and lower floating plates are provided with irregularly shaped openings that run vertically through each other.

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

6. The downhole wellbore axial pressure control 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 sealing 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 to the upper hinge seat, and the lower hinge arm is hinged to 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 sealing hinge seat.

7. The downhole wellbore axial pressure control 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 sealing 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 to the upper hinge seat, and the lower hinge arm is hinged to 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 sealing hinge seat.

8. The downhole wellbore axial pressure control plugging device according to claim 6, characterized in that... The sealing element is a sealing ring. Four sets of hinge components are evenly distributed along the circumference between the upper and lower floating plates. The sealing hinge seat on each set of hinge components is fixedly installed with the sealing ring at the corresponding position. The sealing rings on the four sets of hinge components can form a circle.

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

10. The downhole wellbore axial pressure control plugging device according to claim 8 or 9, characterized in that... The upper inner end of the lower floating plate is provided with an upward-opening horn, which can seal with the sealing ring; or / and, the lower side of the bottom flange is provided with at least two trapezoidal steel ring sealing grooves and four elongated oval bolt holes evenly distributed along the circumference.

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