Sea deepwater oil and gas exploitation sealing device

Abstract

The invention relates to the technical field of sealing devices, in particular to an ocean deepwater oil and gas exploitation sealing device which comprises a sealing ring, a clamping connection pressing ring and a downward-pressing driving ring, and the downward-pressing driving ring is connected with a feeding tool in a clamped mode through a plurality of locking rods. According to the well head sealing device, locking between the sealing ring and the well head is achieved, locking between the pressing-down driving ring and the casing hanger is also achieved, the sealing device is connected with the well head and the casing hanger in a clamped mode, when shaking occurs, the probability of separation is reduced, and upward extraction and separation between the sealing device and the well head and between the sealing device and the casing hanger are avoided. When the thrust sleeve on the feeding tool presses the clamping pressing ring downwards, the clamping pressing ring drives the guide plate to vertically slide downwards, so that clamping between the locking rod and the feeding tool can be separated, that is, after the sealing device is installed, the sealing device and the feeding tool can be separated, and a breaking point does not need to be arranged.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and particularly relates to a sealing device for deep - sea oil and gas exploitation in the ocean. Background Art

[0002] The annular seal assembly ASA (Annulus Seal Assembly) of the subsea wellhead system is the most critical component of the subsea wellhead system. It is mainly used to seal the gap between the high - pressure wellhead and the casing hanger. However, the structure of the sealing device installed between the high - pressure wellhead and the casing hanger is disclosed in the prior art.

[0003] For example, in Chinese Patent Application: CN202410592805.3, titled: A Drilling Wellhead Device, after the assembly between the high - pressure wellhead and the casing hanger is completed, the sealing device is sent downward and snapped between the two to form a seal.

[0004] And in Chinese Patent Application: CN201910041915.X, titled: One - way Feeding Tool and Method for Casing Hanger and Seal Assembly for Subsea Wellhead, it discloses that the sealing device is installed on the outer edge of the feeding tool and is sent downward along the center of the high - pressure wellhead by the feeding tool. When it reaches the final position, the sealing device will be inserted between the two. After the insertion is completed, the sealing device is further pushed downward by the thrust sleeve on the outer edge of the feeding tool to lock the sealing device between the high - pressure wellhead and the casing hanger. Then, it is necessary to separate the feeding tool from the sealing device. The traditional method is to set breakable screws between the feeding tool and the sealing device. After locking the sealing device between the high - pressure wellhead and the casing hanger, press downward continuously to make the preset break position break. However, in this way, it may break during the upward feeding and installation process, resulting in the sealing device not being able to be snapped in. At the same time, there is also a risk that all break points cannot be completely broken, resulting in the feeding tool driving the sealing device upward to separate from the high - pressure wellhead and the casing hanger when the feeding tool is pulled out upward.

[0005] Moreover, when the above - mentioned sealing device is locked between the high - pressure wellhead and the casing hanger, its main clamping position is the clamping between the sealing device and the high - pressure wellhead, and it is impossible to make the sealing device clamp with the casing hanger, resulting in slightly weaker clamping tightness, and there is a probability of separation when shaking occurs.

[0006] Therefore, it is necessary to design a sealing device for deep - sea oil and gas exploitation in the ocean, which can separate the sealing device from the feeding tool after the installation of the sealing device is completed without setting break points. At the same time, the sealing device is provided with clamps between the high - pressure wellhead and the casing hanger to prevent the sealing device from being pulled out and separated upward from the two. Summary of the Invention

[0007] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a sealing device for deep-water offshore oil and gas exploitation, which can separate the sealing device from the running tool after the installation of the sealing device is completed, without the need to set a breaking point. At the same time, the sealing device is clamped between the high-pressure wellhead and the casing hanger to prevent the sealing device from being pulled out upward from between the two.

[0008] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a sealing device for deep-water offshore oil and gas exploitation, including a sealing ring, a clamping pressure ring and a downward pressing driving ring. The downward pressing driving ring is clamped with the 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 pressing driving ring, and the outer edge of the sealing ring fits with 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 second clamping section is arranged at the bottom of the downward pressing driving ring, and the second clamping section abuts against the middle part of the sealing ring. An annular clamping groove two is opened on the casing hanger for the annular clamping groove two to be inserted into. A first clamping section is arranged at the top of the sealing ring, and the first clamping section abuts against one side of the middle part of the clamping pressure ring. An annular clamping groove one for the first clamping section to be inserted into is opened on the wellhead. The other side of the clamping pressure ring abuts against the downward pressing driving ring. When the clamping pressure ring is pushed upward, the clamping pressure ring pushes the first clamping section into the annular clamping groove one, and pushes the second clamping section and the casing hanger into the annular clamping groove two.

[0009] Preferably, each locking rod is horizontally slidably connected to the downward pressing driving ring. One end of the locking rod is inserted into the running tool, and a clamping hole for the locking rod to be inserted into is opened on the outer edge of the running workpiece. An anti-rotation plate is fixedly arranged at the other end of the locking rod. A strip-shaped avoidance hole for avoiding the anti-rotation plate is opened on the clamping pressure ring. A sliding column is arranged at the top of the anti-rotation plate. Two guide plates located on both sides of the anti-rotation plate are fixedly arranged on the clamping pressure ring. An inclined groove for the sliding column to be inserted into is opened on the guide plate, and the inclined groove extends outward from bottom to top.

[0010] Preferably, a plurality of deformation notches one are opened 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 opened in the circumferential direction of the second clamping section.

[0012] Preferably, a deformation groove is opened on the sealing ring, and an annular guiding and sliding notch for the end part of the first clamping section to abut against is opened on the clamping pressure ring.

[0013] Preferably, a flanging ring is arranged on the outer edge of the top of the downward pressing driving ring, and an annular guiding and sliding groove for the flanging ring to be inserted into and capable of vertically sliding is opened inward on the clamping pressure ring.

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

[0015] Preferably, an extension section and a guiding section are provided between the first clamping section and the sealing section, and the outer edge of the guiding section fits with the inner edge of the wellhead.

[0016] Preferably, a vertical extrusion part is provided at the bottom of the clamping pressure ring. The outer edge of the vertical extrusion part fits with the inner edge of the sealing ring, the inner edge of the vertical extrusion part fits with the downward pressure driving ring, and the bottom of the vertical extrusion part is directly above the inclined surface of the second clamping section.

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

[0018] The beneficial effect of the present invention is as follows: for this deep-sea oil and gas extraction sealing device, when the clamping pressure ring is pushed upward, the locking between the sealing ring and the wellhead is achieved, and at the same time, the locking between the downward pressure driving ring and the casing hanger is also achieved. The sealing device is provided with clamping connections 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 two is avoided.

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

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0022] Figure 2 It is Figure 1 The partial enlarged view of A.

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

[0024] Figure 4 It is the partial three-dimensional structure schematic diagram after the clamping pressure ring is pressed downward.

[0025] Figure 5 This is a schematic exploded view of the three-dimensional structure of the present invention.

[0026] Figure 6 This is a schematic three-dimensional structure view of the sealing section.

[0027] Description of reference numerals: 1. sealing ring; 1a. sealing section; 1b. sealing ring; 1c. extension section; 1d. guiding and sliding section; 1e. first clamping section; 1f. deformation groove; 1h. first deformation notch; 2. clamping and pressing ring; 2a. guiding plate; 2b. annular guiding and sliding notch; 2c. annular guiding and sliding groove; 2d. vertical extrusion part; 2f. strip-shaped avoiding hole; 3. downward pressing driving ring; 3a. second clamping section; 3b. second deformation notch; 3c. flanging ring; 4. locking rod; 4a. anti-rotation plate; 4b. sliding column; 10. wellhead; 10a. first annular clamping groove; 11. casing hanger; 11a. second annular clamping groove. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment: The present invention provides a sealing device for deep-water offshore oil and gas exploitation, as Figures 1-6As shown in the figure, it includes a sealing ring 1, a clamping pressure ring 2 and a downward pressing drive ring 3. The downward pressing drive ring 3 is clamped with the feeding tool through a plurality of locking rods 4. The clamping pressure ring 2 and the sealing ring 1 are sequentially sleeved on the outer edge of the downward pressing drive ring 3, and the outer edge of the sealing ring 1 fits with the outer edge of the wellhead 10. A sealing section 1a for sealing is arranged on the sealing ring 1 and inserted between the wellhead 10 and the casing hanger 11. A second clamping section 3a is arranged at the bottom of the downward pressing drive ring 3, and the second clamping section 3a abuts against the middle part of the sealing ring 1. An annular clamping groove 11a is formed on the casing hanger 11 for the second annular clamping groove 11a to be inserted into. A first clamping section 1e is arranged at the top of the sealing ring 1, and the first clamping section 1e abuts against one side of the middle part of the clamping pressure ring 2. An annular clamping groove 10a for the first clamping section 1e to be inserted into is formed on the wellhead 10. The other side of the clamping pressure ring 2 abuts against the downward pressing drive ring 3. When the feeding tool is initially fed downward, the downward pressing drive ring 3 will be driven to move downward through the locking rods 4 by the feeding workpiece. Then, through the abutment between the downward pressing drive ring 3 and the sealing ring 1, the sealing ring 1 can be driven to move downward, so that the sealing section 1a is inserted between the wellhead 10 and the casing hanger 11. During the upward movement of the sealing ring 1, the clamping pressure ring 2 can be driven to move downward together through the abutment between the sealing ring 1 and the clamping pressure ring 2. When the clamping pressure ring 2 is pushed upward, the clamping pressure ring 2 pushes the first clamping section 1e to be inserted into the annular clamping groove 10a, and at the same time, it pushes the second clamping section 3a and the casing hanger 11 to be inserted into the annular clamping groove 11a. That is, the locking between the sealing ring 1 and the wellhead 10 is realized, and at the same time, the locking between the downward pressing drive ring 3 and the casing hanger 11 is realized. Clamping connections are provided between the sealing device and both the wellhead 10 and the casing hanger 11. When there is shaking, the probability of separation is reduced, and the upward extraction separation between the sealing device and the two is avoided.

[0030] The clamping pressure ring 2 is pressed downward along the direction of F1 by the thrust sleeve on the feeding tool, and the first clamping section 1e will rotate along the direction of S1, while the second clamping section 3a will rotate along the direction of S2.

[0031] Figure 2 It is a cross-sectional view when the clamping pressure ring 2 is not pushed downward, and Figure 3This is a cross-sectional view after the clamping pressure ring 2 is pushed downward. It can be seen that the position change of the locking rod 4, each locking rod 4 is horizontally slidably connected to the downward driving ring 3, one end of the locking rod 4 is inserted into the feeding tool, and a clamping hole for inserting the locking rod 4 is provided on the outer edge of the fed workpiece. The feeding tool is not shown in the figure. The feeding tool can be a feeding tool in the prior art. There is a circle of clamping holes at the outer edge. An anti-rotation plate 4a is fixedly provided on the other end of the locking rod 4, and a strip avoidance hole 2f for avoiding the anti-rotation plate 4a is provided on the clamping pressure ring 2. Through the strip avoidance hole 2f, the locking rod 4 can be retracted backward into the space outside the downward driving ring 3, and the strip avoidance hole 2f can avoid collision when the clamping pressure ring 2 moves downward. A slide post 4b is arranged on the top of the anti-rotation plate 4a, and two guide plates 2a located on both sides of the anti-rotation plate 4a are fixedly arranged on the clamping pressure ring 2. The guide plates 2a are provided with an inclined groove for the slide post 4b to be inserted, and the inclined groove 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 slide post 4b will be located at the bottom of the inclined groove. The clamping ring 2 will be pressed downward by the thrust sleeve on the feeding tool, and the clamping ring 2 will drive the guide plate 2a to slide vertically downward, and the slide post 4b will slide along the inclined groove on the guide plate 2a, so that the locking rod 4 is pulled outward, and the clamping connection between the locking rod 4 and the feeding tool can be separated, that is, after the sealing device is installed, the sealing device and the feeding tool can be separated without setting a breaking point, thereby ensuring 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 1h are provided in the circumferential direction of the sealing segment 1a, so that the sealing segment 1a can be retracted inward when squeezed by external force, and the two guide plates 2a are located in the deformation notches 1h. At the same time, the deformation notches 1h provide escape space for the guide plates 2a, so that the guide plates 2a can be set on the clamping ring 2. If there are no deformation notches 1h, the guide plates 2a cannot be designed.

[0033] A plurality of deformation notches 3b are provided in the circumferential direction of the second clamping section 3a, and the deformation notches 3b can be retracted inward when being squeezed by external force.

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

[0035] A flanging ring 3c is provided on the outer edge of the top of the downward pressing drive ring 3. The clamping pressure ring 2 is internally provided with an annular guide chute 2c for the flanging ring 3c to be snapped into and capable of sliding vertically. Through the flanging ring 3c and the annular guide chute 2c, that is, after the clamping pressure ring 2 is sleeved on the outer edge of the downward pressing drive ring 3, the clamping pressure ring 2 cannot be separated from the downward pressing drive ring 3. When the downward pressing drive ring 3 moves downward, the bottom of the flanging ring 3c fits against the bottom of the annular guide chute 2c. When the downward pressing drive ring 3 moves to the final position, by pressing downward on the clamping pressure ring 2, the final state will be presented Figure 3 as shown in the figure, where the top of the flanging ring 3c fits against the top of the annular guide chute 2c.

[0036] A ring groove is provided in the circumferential direction of the sealing section 1a. The sealing section 1a forms a hollow structure through the ring groove. Through this hollow structure, the sealing section 1a can be compressed and deformed, and a sealing ring 1b is provided in the ring groove of the sealing section 1a. Through the sealing ring 1b, a sealing effect is achieved, making the seal between the wellhead 10 and the casing hanger 11 tighter.

[0037] An extension section 1c and a guiding section 1d are provided between the first clamping section 1e and the sealing section 1a. The outer edge of the guiding section 1d fits against the inner edge of the wellhead 10. The guiding section 1d is used to guide the movement of the sealing ring 1, and the overall length of the sealing ring 1 is extended through the extension section 1c to provide sufficient height space for setting the locking rod 4. The deformation groove 1f is located above the guiding section 1d.

[0038] A vertical extrusion part 2d is provided at the bottom of the clamping pressure ring 2. The outer edge of the vertical extrusion part 2d fits against the inner edge of the sealing ring 1. Combined with the fit between the guiding section 1d and the wellhead 10, the circumferential axis of the sealing ring 1 is limited. The height position of the sealing ring 1 is limited by the first clamping section 1e and the second clamping section 3a. The inner edge of the vertical extrusion part 2d fits against the downward pressing drive ring 3. The bottom of the vertical extrusion part 2d is directly above the inclined surface of the second clamping section 3a. When the clamping pressure ring 2 is pushed downward, the vertical extrusion part 2d can push the second clamping section 3a to turn inward, that is, the second clamping section 3a can be clamped with the second annular clamping groove 11a.

[0039] As Figure 2 shown, there is a gap between the anti-rotation plate 4a and the vertical extrusion part 2d. Through this gap, when the clamping pressure ring 2 moves downward, the anti-rotation plate 4a will not directly collide with the clamping pressure ring 2, ensuring that the anti-rotation plate 4a can enter the strip-shaped avoidance hole 2f. And the length of the vertical extrusion part 2d is ensured, improving the overall rigidity of the vertical extrusion part 2d.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications therein.

Claims

1. A sealing device for deep-water oil and gas production in the ocean, characterized in that: The invention comprises a sealing ring (1), a clamping pressure ring (2) and a downward pressure driving ring (3); the downward pressure driving ring (3) is clamped with a running tool via a plurality of locking rods (4); the clamping pressure ring (2) and the sealing ring (1) are sequentially sleeved on the outer edge of the downward pressure driving ring (3); the outer edge of the sealing ring (1) is in contact with the outer edge of a wellbore head (10); a sealing section (1a) inserted between the wellbore head (10) and a casing hanger (11) for sealing is provided on the sealing ring (1); a clamping section 2 (3a) is provided at the bottom of the downward pressure driving ring (3); the clamping section 2 (3a) is in contact with the middle of the sealing ring (1); and a casing hanger (11) is provided for The annular clamping groove (11a) is clamped into the annular clamping groove (11a), the top of the sealing ring (1) is provided with a clamping section (1e), the clamping section (1e) is in contact with one side of the middle part of the clamping pressure ring (2), and the wellhead (10) is provided with an annular clamping groove (10a) for the clamping section (1e) to be clamped into, and the other side of the clamping pressure ring (2) is in contact with the downward driving ring (3). When the clamping pressure ring (2) is pushed upward, the clamping pressure ring (2) pushes the clamping section (1e) to be clamped into the annular clamping groove (10a), and pushes the clamping section (3a) and the casing hanger (11) to be clamped into the annular clamping groove (11a).

2. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: Each locking rod (4) is horizontally slidably connected to the downward pressing driving ring (3), one end of the locking rod (4) is inserted into the feeding tool, the outer edge of the feeding workpiece is provided with a clamping 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 clamping pressure ring (2) is provided with a strip-shaped avoidance 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 clamping pressure 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, and the inclined groove extends outward from bottom to top.

3. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: A plurality of deformation notches 1 (1h) are provided in the circumferential direction of the sealing section (1a), and the two guide plates (2a) are located in the deformation notches 1 (1h).

4. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: A plurality of deformation notches (3b) are provided in the circumferential direction of the second clamping section (3a).

5. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: The sealing ring (1) is provided with a deformation groove (1f), and the clamping pressure ring (2) is provided with an annular guide notch (2b) for abutment against the end of the clamping section 1 (1e).

6. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: A flanged ring (3c) is provided on the top outer edge of the downward pressing drive ring (3), and the clamping pressing ring (2) is provided with an annular guide groove (2c) inwardly provided for the flanged ring (3c) to be clamped in and to slide vertically.

7. The deep-water marine oil and gas production sealing device according to claim 1, characterized in that: An annular groove is provided in the circumferential direction of the sealing section (1a); the sealing section (1a) forms a hollow structure through the annular groove; and a sealing ring (1b) is provided in the annular groove of the sealing section (1a).

8. The deep-water marine oil and gas production sealing device according to claim 5, characterized in that: An extension section (1c) and a guide slide section (1d) are provided between the first clamping section (1e) and the sealing section (1a); the outer edge of the guide slide section (1d) fits with the inner edge of the wellhead head (10); and the deformation groove (1f) is located above the guide slide section (1d).

9. The deep-water marine oil and gas production sealing device according to claim 5, characterized in that: A vertical extrusion portion (2d) is provided at the bottom of the clamping pressure ring (2), the outer edge of the vertical extrusion portion (2d) is in contact with the inner edge of the sealing ring (1), the inner edge of the vertical extrusion portion (2d) is in contact with the downward pressing drive ring (3), and the bottom of the vertical extrusion portion (2d) is directly above the inclined surface of the second clamping section (3a).

10. The deep-water marine oil and gas exploitation sealing device according to claim 9, characterized in that: A gap is left between the anti-rotation plate (4a) and the vertical extrusion portion (2d).

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