Subsea tubing hanger

Abstract

The utility model relates to the technical field of oil pipe hanger, specifically relates to underwater oil pipe hanger, it includes hanger main part, the oil pipe is fixed below hanger main part, and the upper portion is provided with the inner locking structure, the lower part linkage of inner locking structure is provided with the outer locking structure, and the outer locking structure connects locking hanger main part and well hole. The outer locking structure includes the top cap, and the top cap coaxially covers the top of hanger main part, and the lower end of top cap is connected with the upper end of excitation ring, and excitation ring slidingly covers hanger main part, and the lower end of excitation ring abuts against the inner ring side of fixed ring, and the outer ring surface of fixed ring abuts against well hole wall surface. Inner locking structure includes the clamping ring and locking ring, and the clamping ring is arranged outside hanger main part, and the clamping ring is sleeved with locking ring, and the clamping ring and locking ring are engaged together through the tooth surface structure, and the top of locking ring abuts against top cap. The utility model solves the technical problem that underwater oil pipe hanger faces the unexpected unlocking situation under the complex environment under water.

Description

Technical Field

[0001] This utility model relates to the field of tubing hanger technology, and more specifically, to underwater tubing hangers. Background Technology

[0002] Subsea tubing hangers are one of the core components of subsea production trees in offshore oil and gas development. Their main functions include suspending the tubing string, sealing the annular space between the tubing and casing, providing oil and gas production channels, and control interfaces. Subsea tubing hangers must withstand high pressure, strong corrosion, and complex water flow environments, and their sealing and locking performance directly affects the safety of oil and gas wells.

[0003] Currently, there are still many problems with underwater oil and gas operations. For example, when the underwater tubing hanger is subjected to complex external water flow, the stability of the underwater tubing hanger suspending the tubing will decrease when the water flow forces from different directions act on the wellbore and the tubing hanger. This can cause the locking position between the underwater tubing hanger and the wellbore to be subjected to force and accidentally unlock, making it easy for the underwater tubing hanger to fall off from the wellbore. Summary of the Invention

[0004] The purpose of this application is to provide an underwater oil pipe hanger that solves the technical problem of accidental unlocking of underwater oil pipe hangers in complex underwater environments.

[0005] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0006] The underwater oil pipe hanger includes a hanger body, with an oil pipe fixed below the hanger body.

[0007] Preferably, the upper part of the suspension body is provided with an internal locking structure.

[0008] Preferably, the lower part of the inner locking structure is linked to an outer locking structure, which connects the locking suspension body and the wellbore.

[0009] Preferably, the external locking structure includes a top cover, which is coaxially sleeved on the top of the hanger body. The lower end of the top cover is connected to the upper end of the excitation ring. The excitation ring is slidably sleeved on the outside of the hanger body. The lower end of the excitation ring abuts against the inner ring side of the fixed ring. The fixed ring is fixedly sleeved on the outside of the hanger body, and the outer ring surface of the fixed ring abuts against the well wall.

[0010] Preferably, the internal locking structure includes a snap ring and a locking ring. The snap ring is disposed outside the main body of the hanger, and the snap ring is covered with a locking ring. The snap ring and the locking ring are engaged together by a toothed structure, and the top of the locking ring abuts against the top cover.

[0011] Preferably, when the suspension body is unlocked from the shaft, the toothed structure between the snap ring and the locking ring is in a misaligned and disengaged state.

[0012] Preferably, when the hanger body is locked to the wellbore, the toothed structure between the snap ring and the locking ring is in a state of alignment and engagement.

[0013] Preferably, the excitation ring includes a push ring body, which has a circular ring structure and is slidably sleeved on the outer wall of the suspension body.

[0014] Preferably, the upper outer ring surface of the push ring body is provided with threads, and the push ring body is connected to the lower inner surface of the top cover by the threads.

[0015] Preferably, a wedge is provided on the lower outer ring surface of the push ring body, and the wedge is slidably inserted into the inner ring side of the fixed ring.

[0016] Preferably, the outer ring of the suspension body is provided with an annular groove, and the lower end of the fixing ring is engaged in the annular groove.

[0017] Preferably, the fixing ring is configured as a C-shaped ring.

[0018] Preferably, the push ring body is further provided with a limiting groove, and a limiting component is fixed to the outside of the hanger body. The limiting component is vertically slidably disposed in the limiting groove.

[0019] Preferably, the lower inner ring surface of the push ring body is also provided with an anti-slip tooth surface, which contacts the outer wall of the hanger body.

[0020] Preferably, the snap ring includes a collar body, which has an annular structure. An internal thread is provided on the inner ring surface of the collar body. The collar body is fixed to the outer wall thread of the hanger body through the internal thread. An outer ring tooth surface is provided on the outer ring surface of the collar body, and a plurality of tooth-shaped protrusions are formed on its outer ring surface in a uniform axial arrangement.

[0021] Preferably, the locking ring includes a retaining ring body, which has an annular structure and its top end is set as an arc-shaped cover. The inner annular surface of the top cover is also set as an arc, and the arc-shaped cover abuts and matches with the inner annular surface of the top cover.

[0022] Preferably, the inner ring surface at the lower end of the retaining ring body is provided with an inner ring tooth surface, forming a number of tooth-shaped protrusions evenly arranged axially on its inner ring surface.

[0023] Preferably, the ring body has multiple longitudinal grooves on its annular structure. The multiple grooves are evenly arranged circumferentially on the ring body. The bottom of the grooves is a slot, which is opened at the bottom of the ring body. The lower end of the ring body is divided into multiple individual locking blocks by the grooves. The locking blocks are located at the upper part of the excitation ring.

[0024] Preferably, an outer ring is fixed on the lower outer ring surface of the retaining ring body, and the top of the excitation ring is set as an inclined surface.

[0025] Preferably, when the top cover is pressed down into place, the outer ring at the lower end of the locking ring abuts against the top inclined surface of the excitation ring.

[0026] The technical solution of this application has at least the following advantages and beneficial effects:

[0027] In this utility model, by setting an external locking structure between the hanger body and the well passage, the wedge block in the excitation ring is pressed down to squeeze the C-shaped fixing ring, so that the fixing ring located between the hanger body and the well passage is opened, thereby increasing the frictional resistance between the hanger body and the well passage and realizing the locking and fixing of the hanger.

[0028] In this invention, an inner locking structure is provided between the hanger body and the outer locking structure. The inner locking structure and the outer locking structure are linked together. The inner locking structure uses the toothed structure between the snap ring and the locking ring to engage and lock. The engagement position can be achieved through the locking ring, which can be opened by force. When the outer locking structure is pressed down or raised, the toothed structure of the snap ring and the locking ring engages or disengages simultaneously. When the outer locking structure is locked, the inner locking structure also engages together through the toothed structure. By using double locking inside and outside, the occurrence of accidental unlocking of the hanger body from the well channel due to complex external water flow environment is reduced. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0030] Figure 2 This is an enlarged structural diagram of A in this utility model.

[0031] Figure 3 This is a schematic diagram of the snap ring structure in this utility model.

[0032] Figure 4 This is a schematic diagram of the locking ring in this utility model.

[0033] Figure 5 This is a schematic diagram of the excitation ring in this utility model.

[0034] Figure 6 This is a top view of the structure of this utility model.

[0035] In the diagram: 1-Suspension body, 2-Oil pipe short connector, 3-Oil pipe coupling, 4-Oil pipe, 5-Sealing assembly, 6-Snap-fit ​​ring, 601-Collar body, 602-Outer ring tooth surface, 603-Internal thread, 7-Locking ring, 701-Snap-fit ​​ring body, 702-Arc-shaped cover, 703-Groove, 704-Inner ring tooth surface, 705-Outer ring, 8-Top cover, 9-Excitation ring, 901-Push ring body, 902-External thread, 903-Limiting groove, 904-Anti-slip tooth surface, 905-Wedge block, 10-Limiting component, 11-Fixing ring. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Existing subsea tubing hangers are generally placed inside the wellbore. The hanger body 1 of the subsea tubing hanger is sealed to the wellbore through at least two layers of sealing components 5 to reduce the possibility of wellbore leakage. A locking structure is provided on the outside of the hanger body 1 to lock the hanger in the wellbore and to bear the load. A tubing short connector 2 is fixed inside the lower part of the hanger body 1. The tubing short connector 2 is locked to the tubing 4 through the tubing coupling 3, so that the hanging function of the tubing 4 is realized by the locked hanger body 1.

[0039] Example

[0040] Please refer to Figures 1-6 This utility model provides an underwater tubing hanger, which includes an inner locking structure and an outer locking structure. The inner locking structure is located at the upper part of the hanger body 1. The inner locking structure requires manual locking and unlocking, thereby reducing the possibility of accidental unlocking due to complex external pressure environment during the suspension operation of the underwater tubing hanger. The outer locking structure is located below the inner locking structure and is mainly used to connect and lock the hanger body 1 and the wellbore. It is linked with the inner locking structure to prevent accidental unlocking and forms a double lock with the inner locking structure, further improving safety.

[0041] For further details, please refer to... Figure 2 and Figure 5 In this embodiment, the external locking structure includes a top cover 8, an excitation ring 9, a limiting member 10, and a fixing ring 11.

[0042] Specifically, the top cover 8 is coaxially sleeved on the top of the hanger body 1. The lower end of the top cover 8 is connected to the upper end of the excitation ring 9. The excitation ring 9 is slidably sleeved on the outside of the hanger body 1. The lower end of the excitation ring 9 abuts against the inner ring side of the fixed ring 11. The fixed ring 11 is fixedly sleeved on the outside of the hanger body 1. The outer ring surface of the fixed ring 11 is in contact with the well wall surface.

[0043] During the process of locking the subsea tubing hanger into the wellbore, when performing the external locking operation, the top cover 8 is pressed down. The top cover 8 moves down and causes the excitation ring 9 to slide down, so that the lower end of the excitation ring 9 presses against the inner ring side of the fixed ring 11. The inner ring side of the fixed ring 11 is subjected to extrusion force, and the force exerted by its outer ring on the wellbore wall also gradually increases, thereby gradually increasing the frictional resistance between it and the wellbore wall, thus locking and fixing the hanger body 1 in the wellbore.

[0044] In order to improve the external locking effect, the excitation ring 9 includes a push ring body 901, an external thread 902, a limiting groove 903, an anti-slip tooth surface 904, and a wedge block 905.

[0045] Specifically, the push ring body 901 has a circular ring structure. The push ring body 901 is slidably sleeved on the outer wall of the hanger body 1. The upper outer ring surface of the push ring body 901 is provided with threads. The push ring body 901 is connected to the lower inner surface of the top cover 8 through the threads on the outer ring surface, so that the top cover 8 and the push ring body 901 are fixed together and move synchronously. A ring-shaped wedge 905 is fixedly provided on the lower outer ring surface of the push ring body 901. The wedge 905 is shaped like the outer ring of the push ring body 901. With an inclined surface, the wedge 905 is slidably inserted into the inner ring side of the fixing ring 11. When the top cover 8 is pressed down to make the wedge 905 slide vertically into the fixing ring 11, the inclined surface on the wedge 905 will gradually squeeze the upper inner ring side of the fixing ring 11, so that the fixing ring 11 is gradually expanded from a circular ring structure into a trumpet-shaped outward expansion structure, thereby increasing the outer ring diameter of the fixing ring 11, so that the force applied to the wellbore by the outer ring surface of the fixing ring 11 gradually increases, thereby increasing the frictional resistance and realizing the locking of the suspension body 1.

[0046] It is worth noting that the outer ring of the hanger is provided with an annular groove, and the lower end of the fixed ring 11 is engaged in the annular groove, which restricts the vertical displacement of the fixed ring 11. This prevents the fixed ring 11 from moving up and down when the wedge 905 is pressed down, thus affecting the locking effect of the hanger body 1. The fixed ring 11 is designed as a C-shaped ring, which has an opening in its annular structure. This allows the fixed ring 11 to expand and change shape under force when the wedge 905 squeezes its inner ring side, increasing the frictional resistance with the wellbore.

[0047] In addition, a limiting groove 903 is provided on the push ring body 901, and a limiting member 10 is fixed on the outside of the hanger body 1 (a pin can be inserted radially outside the hanger as a limiting member 10). The limiting member 10 is vertically slidably arranged in the limiting groove 903 to assist the push ring body 901 in sliding axially outside the hanger body 1, and the limiting groove 903 is used to restrict the rotation of the ring structure push ring body 901 to reduce the influence of rotation on the threaded connection position between the push ring body 901 and the top cover 8 (to prevent the threads of the push ring body 901 from loosening due to rotation).

[0048] In addition, the lower inner ring surface of the push ring body 901 is also provided with anti-slip tooth surface 904 to increase the frictional resistance between the push ring body 901 and the suspension body 1. When the top cover 8 presses down and drives the entire excitation ring 9 to squeeze the fixed ring 11, the reaction force generated by the fixed ring 11 to the excitation ring 9 when it squeezes the well passage can be partially offset by the frictional resistance between the anti-slip tooth surface 904 and the suspension. This reduces the occurrence of the excitation ring 9 retracting and moving upward due to the reaction force of the fixed ring 11, and increases the locking effect of the suspension body 1.

[0049] For further details, please refer to... Figures 2-4In this embodiment, the internal locking structure includes a snap-fit ​​ring 6 and a locking ring 7. The internal locking structure is sleeved between the hanger body 1 and the top cover 8. The snap-fit ​​ring 6 is fixed to the outside of the hanger body 1, and the locking ring 7 is sleeved on the snap-fit ​​ring 6. The two are engaged together by a toothed structure, and the top of the locking ring 7 abuts against the top cover 8. When the hanger body 1 is not locked, the toothed structure between the snap-fit ​​ring 6 and the locking ring 7 is not engaged, and the toothed surfaces of the two are misaligned and in a disengaged state. When the top cover 8 is pressed down, the abutting locking ring 7 is also pressed down, causing the toothed surfaces of the locking ring 7 and the snap-fit ​​ring 6 to align and engage, thereby locking them together.

[0050] Specifically, the snap ring 6 includes a collar body 601, an outer ring toothed surface 602, and an internal thread 603.

[0051] The locking ring 7 includes a retaining ring body 701, an arc-shaped cover surface 702, a groove 703, an inner ring toothed surface 704, and an outer ring 705.

[0052] The collar body 601 has a ring structure. An internal thread 603 is provided on the inner ring surface of the collar body 601. The collar body 601 is fixed to the outer wall thread of the hanger body 1 by the internal thread 603. An outer ring tooth surface 602 is provided on the outer ring surface of the collar body 601, and several tooth-shaped protrusions are formed on its outer ring surface in a uniform axial arrangement.

[0053] The retaining ring body 701 has a ring structure. The top of the retaining ring body 701 is set as an arc-shaped cover surface 702. The inner ring surface of the top cover 8 is also arc-shaped, so that the arc-shaped cover surface 702 and the inner ring surface of the top cover 8 abut and match together, so that when the top cover 8 is pressed down, the locking ring 7 can be moved down together. The inner ring surface at the lower end of the retaining ring body 701 is provided with an inner ring tooth surface 704, and several tooth-shaped protrusions are formed on its inner ring surface with uniform axial arrangement.

[0054] The ring body 701 has multiple longitudinal grooves 703 on its annular structure. The grooves 703 are evenly arranged circumferentially on the ring body 701. The bottom of the grooves 703 is a slot, which is opened at the bottom of the ring body 701, dividing the lower end of the ring body 701 into multiple individual locking blocks. The separated locking blocks have stronger extensibility and can be stretched open.

[0055] When locking the main body 1 of the suspension device, the top cover 8 is pressed down with a tool. The top cover 8 squeezes the retaining ring body 701 and moves it down, causing the retaining blocks at the lower end of the retaining ring body 701 to move down. The inner ring tooth surface 704 on the inner side of the retaining block contacts the outer ring tooth surface 602 on the outer side of the collar body 601. When the tooth surfaces contact each other, the separate retaining blocks are pushed apart by the squeezing force, so that the inner ring tooth surface 704 on the retaining block can continue to move down until the top cover 8 is pressed down to the end. Only then do the inner ring tooth surfaces 704 on each retaining block engage with the outer ring tooth surface 602 on the collar body 601, thus achieving the locking function.

[0056] When unlocking the main body 1 of the hanger, use a tool to hook the arc-shaped cover 702 of the locking ring 7 and pull it upwards and swing it. When the locking ring 7 is subjected to the force from above, its arc-shaped cover 702 will slide along the arc-shaped inner ring of the top cover 8, causing the various locking blocks at the lower end to be swinged, causing the inner ring tooth surface 704 on the locking block to gradually separate and loosen from the outer ring tooth surface 602 of the locking ring 6, and the engagement will fail, thus making it easier to hook the locking ring 7 up and separate it from the main body 1 of the hanger. When the inner locking structure is unlocked, the top cover 8, which moves upwards along with the locking ring 7, will also drive the excitation ring 9 to move upwards, which will reduce the frictional resistance between the outer ring surface of the fixed ring 11 and the well channel, thereby realizing the unlocking of the main body 1 of the hanger in the well channel.

[0057] It is worth noting that, please refer to Figure 2 An outer ring 705 is fixed on the lower outer ring surface of the retaining ring body 701 (the outer ring 705 is also separated by the groove 703). The outer ring 705 makes the lower outer ring of the retaining ring body 701 convex. The top of the excitation ring 9, which is threaded and matched at the lower end of the top cover 8, is inclined. When the top cover 8 is pressed down, the outer ring 705 at the lower end of the locking ring 7, which is pressed down, will abut against the inclined top of the excitation ring 9 (the inner ring diameter of the excitation ring 9 is smaller than the inner ring diameter of the top cover 8). At this time, each of the outwardly expanding retaining blocks is squeezed by the inclined top of the outer excitation ring 9, causing each outwardly expanding retaining block to shrink inward along the circumference. This causes the inner ring tooth surface 704 on the retaining block, which can be displaced due to the outward expansion, to engage with the outer ring tooth surface 602 on the locking ring 7. The tooth surfaces mesh with each other, so that the entire locking ring 7 can no longer be displaced, thereby achieving the locking function. When unlocking, the lower end of the upward-swinging locking ring 7 will swing and no longer abut against the top inclined surface of the excitation ring 9, causing the engagement between the inner ring tooth surface 704 and the outer ring tooth surface 602 to fail, thus achieving the unlocking function.

[0058] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. An underwater oil pipe hanger, comprising a hanger body (1), wherein an oil pipe (4) is fixed below the hanger body (1), characterized in that... ； The upper part of the main body (1) of the hanger is provided with an internal locking structure; The lower part of the inner locking structure is linked to an outer locking structure, which connects the locking hanger body (1) and the shaft. The external locking structure includes a top cover (8), which is coaxially sleeved on the top of the hanger body (1). The lower end of the top cover (8) is connected to the upper end of the excitation ring (9). The excitation ring (9) is slidably sleeved on the outside of the hanger body (1). The lower end of the excitation ring (9) abuts against the inner ring side of the fixing ring (11). The fixing ring (11) is fixedly sleeved on the outside of the hanger body (1). The outer ring surface of the fixing ring (11) abuts against the well wall surface. The internal locking structure includes a snap ring (6) and a locking ring (7). The snap ring (6) is located outside the main body (1) of the hanger. The snap ring (6) is covered with a locking ring (7). The snap ring (6) and the locking ring (7) are engaged together by a toothed structure. The top of the locking ring (7) abuts against the top cover (8). When the suspension body (1) is unlocked from the shaft, the tooth surface structure between the snap ring (6) and the locking ring (7) is in a misaligned and disengaged state; When the main body (1) of the hanger is locked to the well, the tooth surface structure between the snap ring (6) and the locking ring (7) is in a state of alignment and meshing.

2. The underwater tubing hanger according to claim 1, characterized in that, The excitation ring (9) includes a push ring body (901), which has a circular structure and is slidably sleeved on the outer wall of the hanger body (1); The upper outer ring surface of the push ring body (901) is provided with threads, and the push ring body (901) is connected to the lower inner surface of the top cover (8) by the threads. A wedge (905) is provided on the lower outer ring surface of the push ring body (901), and the wedge (905) is slidably inserted into the inner ring side of the fixed ring (11).

3. The underwater tubing hanger according to claim 1, characterized in that, The outer ring of the main body (1) of the suspension device is provided with an annular groove, and the lower end of the fixing ring (11) is engaged in the annular groove; The fixing ring (11) is configured as a C-shaped ring.

4. The underwater tubing hanger according to claim 2, characterized in that, The push ring body (901) is also provided with a limiting groove (903), and a limiting component (10) is fixed on the outside of the hanger body (1). The limiting component (10) is vertically slidably arranged in the limiting groove (903).

5. The underwater tubing hanger according to claim 2, characterized in that, The lower inner ring surface of the push ring body (901) is also provided with an anti-slip tooth surface (904), which contacts the outer wall of the hanger body (1).

6. The underwater tubing hanger according to claim 1, characterized in that, The snap ring (6) includes a collar body (601), which has an annular structure. An internal thread (603) is provided on the inner ring surface of the collar body (601). The collar body (601) is fixed to the outer wall thread of the hanger body (1) through the internal thread (603). An outer ring tooth surface (602) is provided on the outer ring surface of the collar body (601), forming a number of tooth-shaped protrusions evenly arranged axially on its outer ring surface.

7. The underwater tubing hanger according to claim 1, characterized in that, The locking ring (7) includes a retaining ring body (701), which has a ring structure and its top end is set as an arc-shaped cover (702). The inner ring surface of the top cover (8) is also set as an arc shape, and the arc-shaped cover (702) abuts and matches with the inner ring surface of the top cover (8). The inner ring surface at the lower end of the retaining ring body (701) is provided with an inner ring tooth surface (704), and a number of tooth-shaped protrusions are formed on its inner ring surface in a uniform axial arrangement.

8. The underwater tubing hanger according to claim 7, characterized in that, The ring body (701) has multiple longitudinal grooves (703) on its annular structure. The multiple grooves (703) are evenly arranged circumferentially on the ring body (701). The bottom of the grooves (703) is a slot. The slot is opened at the bottom of the ring body (701). The lower end of the ring body (701) is divided into multiple individual locking blocks by the grooves (703). The locking blocks are located at the upper part of the excitation ring (9).

9. The underwater tubing hanger according to claim 8, characterized in that, The lower outer ring (705) of the retaining ring body (701) is fixed with an outer ring (705), and the top of the excitation ring (9) is set as an inclined surface; When the top cover (8) is pressed down into place, the outer ring (705) at the lower end of the locking ring (7) abuts against the top inclined surface of the excitation ring (9).

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