A seal device for offshore deepwater oil and gas production

Abstract

The present application relates to the technical field of sealing device, and particularly relates to a marine deepwater oil and gas exploitation sealing device, which comprises a sealing ring, a clamping pressure ring and a downward driving ring, the downward driving ring is clamped with a running tool through a plurality of locking rods, the marine deepwater oil and gas exploitation sealing device, the clamping pressure ring is pushed upward, that is, the locking between the sealing ring and the wellhead is realized, and the locking between the downward driving ring and the casing hanger is also realized, the sealing device is clamped between the wellhead and the casing hanger, when shaking occurs, the probability of separation is reduced, and the upward extraction separation between the sealing device and the wellhead and the casing hanger is avoided. When the pushing sleeve on the running tool presses the clamping pressure ring downward, the clamping pressure ring will drive the guide plate to slide downward vertically, the clamping between the locking rod and the running tool is separated, that is, the separation between the sealing device and the running tool after the sealing device is installed is realized, and a breaking point does not need to be arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing devices, in particular to a sealing device for deepwater oil and gas exploitation. BACKGROUND

[0002] The annular seal assembly (ASA) of the underwater wellhead system is the most critical component of the underwater wellhead system. It is mainly used to seal the gap between the high-pressure wellhead and the casing hanger. However, the existing technology discloses a structure for installing a sealing device between the high-pressure wellhead and the casing hanger.

[0003] For example, Chinese patent application CN202410592805.3, entitled "Drilling wellhead device", discloses that the sealing device is sent down and clamped between the high-pressure wellhead and the casing hanger after assembly, thereby forming a seal.

[0004] Chinese patent application CN201910041915.X, entitled "Casing hanger and sealing assembly one-way running tool and method for underwater wellhead", discloses that the sealing device is installed on the outer edge of the running tool, and the running tool is sent down along the center of the high-pressure wellhead. When the running tool reaches the final position, the sealing device is inserted between the high-pressure wellhead and the casing hanger. After insertion, the sealing device is locked between the high-pressure wellhead and the casing hanger by the pushing sleeve on the outer edge of the running tool. Then, the running tool and the sealing device need to be separated. The conventional method is to set a screw that can be broken between the running tool and the sealing device. After the sealing device is locked between the high-pressure wellhead and the casing hanger, the screw is pressed downward to break at the preset breaking position. However, this method may break during the upward installation process, causing the sealing device to fail to clamp in place. In addition, all breaking points may not break completely, causing the running tool to separate from the sealing device when the running tool is pulled upward.

[0005] Moreover, when the sealing device is locked between the high-pressure wellhead and the casing hanger, the main clamping position is between the sealing device and the high-pressure wellhead, and the sealing device cannot be clamped between the casing hanger, resulting in a slightly weak clamping tightness. When the device shakes, there is a probability of separation.

[0006] Therefore, it is necessary to design a sealing device for deepwater oil and gas exploitation, which can separate the sealing device from the running tool after installation without the need for a breaking point. In addition, the sealing device is clamped between the high-pressure wellhead and the casing hanger to prevent the sealing device from being pulled upward and separated from the two devices. SUMMARY

[0007] In view of the above technical deficiencies, the purpose of the present application is to provide a marine deepwater oil and gas exploitation sealing device, which can separate the sealing device from the running tool without setting a breaking point after the installation of the sealing device is completed, and meanwhile, the sealing device is provided with a clamping connection between the high-pressure wellhead and the casing hanger to avoid the upward extraction separation between the sealing device and the two.

[0008] In order to achieve the above purpose, the present application adopts the following technical scheme: the present application provides a marine deepwater oil and gas exploitation sealing device, which comprises a sealing ring, a clamping pressure ring and a downward driving ring, the downward driving ring is clamped with a running tool through a plurality of locking rods, the clamping pressure ring and the sealing ring are sequentially sleeved on the outer edge of the downward driving ring, and the outer edge of the sealing ring is attached to the outer edge of the wellhead, a sealing section for sealing is arranged on the sealing ring and inserted between the wellhead and the casing hanger, a clamping section two is arranged at the bottom of the downward driving ring and abuts against the middle part of the sealing ring, an annular clamping groove two is formed on the casing hanger for clamping the annular clamping groove two, a clamping section one is arranged at the top of the sealing ring and abuts against one side of the middle part of the clamping pressure ring, an annular clamping groove one is formed on the wellhead for clamping the clamping section one, and the other side of the clamping pressure ring abuts against the downward driving ring, when the clamping pressure ring is pushed upward, the clamping pressure ring pushes the clamping section one to be clamped into the annular clamping groove one, and the clamping section two is pushed to be clamped into the annular clamping groove two.

[0009] Preferably, each locking rod is horizontally and slidingly connected with the downward driving ring, one end of the locking rod is inserted into the running tool, the outer edge of the running tool is provided with a clamping hole for inserting the locking rod, the other end of the locking rod is fixedly provided with an anti-rotation plate, a strip-shaped avoiding hole is formed on the clamping pressure ring for avoiding the anti-rotation plate, a slide column is arranged at the top of the anti-rotation plate, two guide plates are fixedly arranged on the clamping pressure ring and located on both sides of the anti-rotation plate, an inclined slot is formed on the guide plate for inserting the slide column, and the inclined slot extends outward from bottom to top.

[0010] Preferably, a plurality of deformation notches one are formed in the circumferential direction of the sealing section, and the two guide plates are located in the deformation notches one.

[0011] Preferably, a plurality of deformation notches two are formed in the circumferential direction of the clamping section two.

[0012] Preferably, a deformation groove is formed on the sealing ring, and an annular guide sliding notch is formed on the clamping pressure ring for abutting against the end of the clamping section one.

[0013] Preferably, a flange ring is arranged on the top outer edge of the downward driving ring, and an annular guide sliding groove is formed in the clamping pressure ring for clamping the flange ring and enabling the flange ring to vertically slide.

[0014] Preferably, a ring groove is formed in the circumferential direction of the sealing segment, the sealing segment forms a hollow structure through the ring groove, and a sealing ring is arranged in the ring groove of the sealing segment.

[0015] Preferably, an extension segment and a guide sliding segment are arranged between the clamping segment one and the sealing segment, and the outer edge of the guide sliding segment is attached to the inner edge of the wellhead.

[0016] Preferably, a vertical extrusion part is arranged at the bottom of the clamping pressure ring, the outer edge of the vertical extrusion part is attached to the inner edge of the sealing ring, the inner edge of the vertical extrusion part is attached to the lower pressing driving ring, and the bottom of the vertical extrusion part is directly above the inclined surface of the clamping segment two.

[0017] Preferably, a gap is left between the anti-rotation plate and the vertical extrusion part.

[0018] The beneficial effects of the present application are that the clamping pressure ring is pushed upward, which realizes the locking between the sealing ring and the wellhead, and also realizes the locking between the lower pressing driving ring and the casing hanger, the sealing device is clamped between the wellhead and the casing hanger, the probability of separation is reduced when shaking occurs, and the upward extraction separation between the sealing device and the two is avoided.

[0019] Before the clamping pressure ring is pressed downward, the plurality of locking rods are clamped with the running tool, so that the running tool can drive the sealing device to move downward synchronously when the running tool moves downward. When the thrust sleeve on the running tool presses the clamping pressure ring downward, the clamping pressure ring drives the guide plate to slide vertically downward, so that the clamping between the locking rod and the running tool is separated, that is, the separation between the sealing device and the running tool after the installation of the sealing device is realized, without the need to set a breaking point, and the stability of the installation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a sectional view of the installation state of the present application.

[0022] Figure 2 It is Figure 1 It is a local enlarged view of A.

[0023] Figure 3 It is a sectional view after the clamping pressure ring is pressed downward.

[0024] Figure 4 It is a local perspective structural schematic view after the clamping pressure ring is pressed downward.

[0025] Figure 5 It is a schematic view of the exploded perspective structure of the present application.

[0026] Figure 6 It is a schematic view of the perspective structure of the sealing section.

[0027] Marked as follows: 1, sealing ring; 1a, sealing section; 1b, sealing ring; 1c, extension section; 1d, guide sliding section; 1e, clamping section one; 1f, deformation groove; 1h, deformation notch one; 2, clamping pressure ring; 2a, guide plate; 2b, annular guide sliding notch; 2c, annular guide sliding groove; 2d, vertical extrusion part; 2f, strip-shaped avoiding hole; 3, lower pressing driving ring; 3a, clamping section two; 3b, deformation notch two; 3c, flange ring; 4, locking rod; 4a, anti-rotation plate; 4b, sliding column; 10, wellhead; 10a, annular clamping groove one; 11, casing hanger; 11a, annular clamping groove two. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0029] Embodiment: The present application provides a kind of marine deepwater oil and gas exploitation sealing device, such as Figures 1-6As shown, including sealing ring 1, clamping pressure ring 2 and down pressure drive ring 3, down pressure drive ring 3 is clamped with the running tool through a plurality of locking rods 4, clamping pressure ring 2 and sealing ring 1 are sequentially sleeved on the outer edge of down pressure drive ring 3, and the outer edge of sealing ring 1 is fitted with the outer edge of wellhead 10, sealing section 1a for sealing is arranged on sealing ring 1 between wellhead 10 and casing hanger 11, the bottom of down pressure drive ring 3 is provided with clamping section two 3a, clamping section two 3a is in contact with the middle part of sealing ring 1, annular clamping groove two 11a is arranged on casing hanger 11, clamping section one 1e is arranged on the top of sealing ring 1, clamping section one 1e is in contact with the middle part of clamping pressure ring 2, annular clamping groove one 10a is arranged on wellhead 10, the other side of clamping pressure ring 2 is in contact with down pressure drive ring 3, when the running tool is first sent down, down pressure drive ring 3 is driven to move downward by locking rod 4 through the running tool, sealing ring 1 is driven to move downward through the contact between down pressure drive ring 3 and sealing ring 1, so that sealing section 1a is inserted between wellhead 10 and casing hanger 11. During the upward movement of sealing ring 1, clamping pressure ring 2 is driven to move downward together through the contact between sealing ring 1 and clamping pressure ring 2. When clamping pressure ring 2 is pushed upward, clamping section one 1e is clamped into annular clamping groove one 10a, and clamping section two 3a is clamped into annular clamping groove two 11a. That is, the locking between sealing ring 1 and wellhead 10 is realized, and the locking between down pressure drive ring 3 and casing hanger 11 is also realized. The sealing device is clamped between wellhead 10 and casing hanger 11, so that the probability of separation is reduced when shaking occurs, and the upward extraction separation between the sealing device and wellhead 10 and casing hanger 11 is avoided.

[0030] By pressing clamping pressure ring 2 downward along the direction of F1 through the pushing sleeve on the running tool, clamping section one 1e will rotate along the direction of S1, and clamping section two 3a will rotate along the direction of S2.

[0031] Figure 2 It is a sectional view of clamping pressure ring 2 not being pushed downward, and Figure 3The cross-sectional view of the downward pushing of the clamping ring 2 can be seen by the position change of the locking rod 4. Each locking rod 4 is horizontally slidably connected with the downward driving ring 3. One end of the locking rod 4 is inserted into the running-in tool. The outer edge of the running-in tool is provided with a clamping hole for the insertion of the locking rod 4. The running-in tool is not shown in the figure. The running-in tool can be the running-in tool in the prior art. The outer edge has a circle of clamping holes. The other end of the locking rod 4 is fixedly provided with an anti-rotation plate 4a. The clamping ring 2 is provided with a strip-shaped avoiding hole 2f for avoiding the anti-rotation plate 4a. Through the strip-shaped avoiding hole 2f, the locking rod 4 can be retracted to the space outside the downward driving ring 3, and the strip-shaped avoiding hole 2f can avoid collision when the clamping ring 2 moves downward. The top of the anti-rotation plate 4a is provided with a sliding column 4b. The clamping ring 2 is fixedly provided with two guide plates 2a located on both sides of the anti-rotation plate 4a. The guide plate 2a is provided with an inclined slot for the insertion of the sliding column 4b. The inclined slot extends outward from bottom to top. Figure 3 The state shown is the state after the clamping ring 2 is pressed downward. Before the clamping ring 2 is pressed downward, the sliding column 4b will be located at the bottom of the inclined slot. The clamping ring 2 is pressed downward by the pushing sleeve on the running-in tool. The clamping ring 2 will drive the guide plate 2a to slide vertically downward. The sliding column 4b will slide along the inclined slot on the guide plate 2a, so that the locking rod 4 is pulled outward, that is, the clamping between the locking rod 4 and the running-in tool is separated, that is, the separation between the sealing device and the running-in tool after the installation of the sealing device is completed, without the need to set a breaking point, to ensure the stability of the installation. When the locking rod 4 moves, it will be retracted inward along the direction of F2.

[0032] A plurality of deformation notches one 1h are provided in the circumferential direction of the sealing section 1a, so that the sealing section 1a can be folded inward when subjected to external pressure. The two guide plates 2a are located in the deformation notches one 1h, and the deformation notches one 1h provide avoiding space for the guide plates 2a, so that the guide plates 2a can be provided on the clamping ring 2. If there is no deformation notches one 1h, the guide plates 2a cannot be designed.

[0033] A plurality of deformation notches two 3b are provided in the circumferential direction of the clamping section two 3a, which can be folded inward when subjected to external pressure.

[0034] The sealing ring 1 is provided with a deformation groove 1f for controlling the rotation axis direction of the clamping section one 1e. The clamping ring 2 is provided with an annular guide sliding notch 2b for the end of the clamping section one 1e to abut. When the clamping ring 2 is pressed downward, the clamping ring 2 will push the clamping section one 1e through the annular guide sliding notch 2b, so that the end of the clamping section one 1e slides along the inclined surface of the annular guide sliding notch 2b, and finally clamps into the annular clamping groove one 10a.

[0035] The top outer edge of the downward driving ring 3 is provided with a flange ring 3c, and the clamping pressure ring 2 is provided with an annular guide sliding groove 2c which is capable of vertically sliding and into which the flange ring 3c is clamped. Through the color flange ring 3c and the annular guide sliding groove 2c, after the clamping pressure ring 2 is sleeved on the outer edge of the downward driving ring 3, the clamping pressure ring 2 cannot be separated from the downward driving ring 3. When the downward driving ring 3 moves downward, the bottom of the flange ring 3c is in contact with the bottom of the annular guide sliding groove 2c. When the downward driving ring 3 moves to the final position, the clamping pressure ring 2 is pressed downward, and finally the top of the flange ring 3c is in contact with the top of the annular guide sliding groove 2c. Figure 3

[0036] A ring groove is formed in the circumferential direction of the sealing section 1a, and the sealing section 1a is formed as a hollow structure through the ring groove. Through the hollow structure, the sealing section 1a can be compressed and deformed, and a sealing ring 1b is arranged in the ring groove of the sealing section 1a. Through the sealing ring 1b, a sealing effect is achieved, so that the sealing between the wellhead 10 and the casing hanger 11 is more tight.

[0037] The clamping section one 1e and the sealing section 1a are provided with an extension section 1c and a guide sliding section 1d. The outer edge of the guide sliding section 1d is in contact with the inner edge of the wellhead 10, which is used for guiding the movement of the sealing ring 1, and the overall length of the sealing ring 1 is extended through the extension section 1c, so that there is enough height space to arrange the locking rod 4. The deformation groove 1f is located above the guide sliding section 1d.

[0038] The bottom of the clamping pressure ring 2 is provided with a vertical extrusion part 2d, the outer edge of the vertical extrusion part 2d is in contact with the inner edge of the sealing ring 1, and the vertical extrusion part 2d is in contact with the wellhead 10 and the guide sliding section 1d, which limits the circumferential axis of the sealing ring 1. The height position of the sealing ring 1 is limited by the clamping section one 1e and the clamping section two 3a, the inner edge of the vertical extrusion part 2d is in contact with the downward driving ring 3, the bottom of the vertical extrusion part 2d is directly above the inclined surface of the clamping section two 3a, and the vertical extrusion part 2d can push the clamping section two 3a to turn inward when the clamping pressure ring 2 is pushed downward, that is, the clamping section two 3a can be clamped between the annular clamping groove two 11a.

[0039] As shown in Figure 2 The gap between the anti-rotation plate 4a and the vertical extrusion part 2d. Through the gap, when the clamping pressure ring 2 moves downward, the anti-rotation plate 4a will not directly collide with the clamping pressure ring 2, which ensures that the anti-rotation plate 4a can enter the strip-shaped avoiding hole 2f. And ensure the length of the vertical extrusion part 2d, improve the rigidity of the vertical extrusion part 2d as a whole.

[0040] ​Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A sealing device for deep-sea oil and gas extraction, characterized in that, The device includes a sealing ring (1), a snap-fit ​​pressure ring (2), and a downward pressure drive ring (3). The downward pressure drive ring (3) is snapped into the insertion tool by multiple locking rods (4). The snap-fit ​​pressure ring (2) and the sealing ring (1) are sequentially fitted onto the outer edge of the downward pressure drive ring (3), and the outer edge of the sealing ring (1) is in contact with the outer edge of the wellhead (10). The sealing ring (1) is provided with a sealing section (1a) for sealing, which is inserted between the wellhead (10) and the casing hanger (11). The bottom of the downward pressure drive ring (3) is provided with a snap-fit ​​section two (3a), which abuts against the middle of the sealing ring (1). The casing hanger (11) is provided with a... The annular groove 2 (11a) is inserted into the annular groove 2 (11a). The top of the sealing ring (1) is provided with a snap-fit ​​section 1 (1e). The snap-fit ​​section 1 (1e) abuts against one side of the middle part of the snap-fit ​​pressure ring (2). The wellhead (10) is provided with an annular groove 1 (10a) for the snap-fit ​​section 1 (1e) to be inserted into. The other side of the snap-fit ​​pressure ring (2) abuts against the downward pressure drive ring (3). When the snap-fit ​​pressure ring (2) is pushed upward, the snap-fit ​​pressure ring (2) pushes the snap-fit ​​section 1 (1e) into the annular groove 1 (10a) and pushes the snap-fit ​​section 2 (3a) and the casing hanger (11) into the annular groove 2 (11a). Each locking rod (4) is horizontally slidably connected to the lower driving ring (3). One end of the locking rod (4) is inserted into the feeding tool. The outer edge of the workpiece is provided with a locking hole for the locking rod (4) to be inserted. The other end of the locking rod (4) is fixedly provided with an anti-rotation plate (4a). The snap ring (2) is provided with a strip-shaped clearance hole (2f) for avoiding the anti-rotation plate (4a). The top of the anti-rotation plate (4a) is provided with a sliding column (4b). The snap ring (2) is fixedly provided with two guide plates (2a) located on both sides of the anti-rotation plate (4a). The guide plate (2a) is provided with an inclined groove for the sliding column (4b) to be inserted. The inclined groove extends outward from bottom to top.

2. The sealing device for deep-sea oil and gas extraction as described in claim 1, characterized in that, Multiple deformation notches (1h) are provided in the circumferential direction of the sealing section (1a), and two guide plates (2a) are located in the deformation notches (1h).

3. The sealing device for deep-sea oil and gas extraction as described in claim 1, characterized in that, Multiple deformation notches (3b) are provided in the circumferential direction of the snap-fit ​​section 2 (3a).

4. A sealing device for deep-sea oil and gas extraction as described in claim 1, characterized in that, The sealing ring (1) has a deformation groove (1f) and the snap-fit ​​pressure ring (2) has an annular guide notch (2b) for the end of the snap-fit ​​section (1e) to abut.

5. A sealing device for deep-sea oil and gas extraction as described in claim 1, characterized in that, A flange ring (3c) is provided on the top outer edge of the pressure drive ring (3), and an annular guide groove (2c) is provided inward for the flange ring (3c) to be inserted and to slide vertically.

6. A sealing device for deep-sea oil and gas extraction as described in claim 1, characterized in that, A ring groove is formed in the circumferential direction of the sealing section (1a), and the sealing section (1a) forms a hollow structure through the ring groove. A sealing ring (1b) is provided in the ring groove of the sealing section (1a).

7. A sealing device for deep-sea oil and gas extraction as described in claim 4, characterized in that, An extension section (1c) and a guide section (1d) are provided between the snap-fit ​​section (1e) and the sealing section (1a). The outer edge of the guide section (1d) fits against the inner edge of the wellhead (10), and the deformation groove (1f) is located above the guide section (1d).

8. A sealing device for deep-sea oil and gas extraction as described in claim 4, characterized in that, The bottom of the snap-fit ​​pressure ring (2) is provided with a vertical squeezing part (2d). The outer edge of the vertical squeezing part (2d) is in contact with the inner edge of the sealing ring (1), the inner edge of the vertical squeezing part (2d) is in contact with the downward pressure drive ring (3), and the bottom of the vertical squeezing part (2d) is directly above the inclined surface of the snap-fit ​​section two (3a).

9. A sealing device for deep-sea oil and gas extraction as described in claim 8, characterized in that, A gap is left between the anti-rotation plate (4a) and the vertical extrusion part (2d).

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