Hole protection sleeve for Christmas tree through hole

Abstract

The utility model relates to a hole protection sleeve for a Christmas tree through hole, relates to the technical field of petrochemical engineering, and is used for solving the problem that the internal molded surface of the Christmas tree through hole is easy to damage. The device comprises a body assembly which is arranged on a mandrel hanger bearing ring arranged in a through hole of a Christmas tree in a seated mode; the split ring is arranged on the periphery of the body assembly in a sleeving mode, and the split ring is placed on the limiting circular bead of the body assembly; the sleeve is arranged on the periphery of the body assembly in a sleeving manner; the hole protection sleeve is constructed in the mode that a sleeve of the hole protection sleeve moves towards the split ring in the first direction, so that the split ring is opened to be clamped on the clamping molded surface of the through hole of the Christmas tree. The body assembly is arranged in the Christmas tree through hole, so that the internal molded surface of the Christmas tree through hole is protected. Therefore, the problem that the internal molded surface is damaged due to the fact that the periphery falls to the Christmas tree through hole is solved. Therefore, the Christmas tree can be normally used.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a hole protection sleeve for through holes in oil wellheads. Background Technology

[0002] In existing technologies, the wellhead, especially the subsea wellhead, is a crucial passageway in the oil production process, and its internal profile is extremely important. This wellhead contains multiple locking profiles and hydraulic channels. Without proper protection, external objects may fall into the wellhead and damage its internal profile. This would render the associated tools unusable, thus affecting oil and gas well production operations.

[0003] The above describes the problem that the internal surface of the wellhead borehole in existing technologies is easily damaged. Utility Model Content

[0004] This invention provides a protective sleeve for the through-hole of an oil well tree, which solves the problem of easy damage to the internal surface of the through-hole.

[0005] This utility model provides a hole protection sleeve for through holes in oil well trees, comprising:

[0006] The main body assembly, which is seated on a tubing hanger bearing ring located within the through-hole of the wellhead; and

[0007] An open ring, which is fitted onto the outer periphery of the body assembly, is placed on the limiting shoulder of the body assembly; and

[0008] A sleeve, which is fitted onto the outer periphery of the main body component;

[0009] The hole protection sleeve is constructed such that its sleeve moves toward the opening ring along the first direction, causing the opening ring to open and engage with the engagement surface inside the wellhead.

[0010] In one embodiment, the open ring is provided with an opening, and the hole protection sleeve is configured such that one end of its sleeve extends into the open ring to expand the open ring in its radial direction.

[0011] In one implementation, the ontology component includes:

[0012] Upper body; and

[0013] The lower body, one end of which is inserted into the upper body; and

[0014] Connecting pins are inserted into the upper body and the lower body;

[0015] A limiting shoulder is formed between the upper body and the lower body, and the upper body and the lower body are fixedly connected by connecting pins.

[0016] In one embodiment, a first anti-rotation hole is provided at one end of the upper body that is inserted into the lower body, and a second anti-rotation hole is provided at the end of the lower body that contacts the upper body. The second anti-rotation hole is provided in correspondence with the first anti-rotation hole, and an anti-rotation screw is inserted into the first and second anti-rotation holes.

[0017] In one embodiment, a positioning hole is provided at the end of the upper body away from the lower body, and an elastic shear pin is provided on the sleeve. When the sleeve moves to the position where the opening ring opens and locks onto the engaging surface, the elastic shear pin extends into the positioning hole.

[0018] In one embodiment, the resilient shear pin includes:

[0019] Spring seat, which is fixed to the sleeve; and

[0020] The spring cavity is disposed on the spring seat; and

[0021] Connecting screws secure the spring cavity to the spring seat; and

[0022] A first spring is disposed within a mounting cavity defined by a spring seat and a spring cavity; and

[0023] The shearing pin is slidably disposed in the spring cavity and can extend into the positioning hole;

[0024] The first spring is located between the spring seat and the shear pin, and it can press the shear pin tightly into the spring cavity.

[0025] In one embodiment, an anti-rotation key assembly is provided on the outer periphery of the lower body. The anti-rotation key assembly cooperates with the keyway provided on the tubing hanger bearing ring to prevent the hole protection sleeve from rotating inside the tree trunk through hole.

[0026] In one embodiment, a mounting groove is provided on the outer periphery of the lower body, and the anti-rotation key assembly includes:

[0027] A pressure ring, which is fixed to the outer periphery of the lower body by screws; and

[0028] The anti-rotation key is slidably positioned within the mounting space constructed from the pressure ring and the mounting groove; and

[0029] The second spring is located in the anti-rotation key and the mounting slot;

[0030] The second spring can press the anti-rotation key onto the pressure ring. When the anti-rotation key is pressed onto the pressure ring, the anti-rotation key engages with the keyway.

[0031] In one embodiment, an unlocking screw is provided at the end of the positioning hole away from the shear pin, the unlocking screw being used to push the shear pin out of the positioning hole.

[0032] In one embodiment, an L-shaped groove is provided at the end of the sleeve away from the body assembly. The L-shaped groove is used to connect with an external hole protection sleeve insertion tool, which can drive the sleeve to slide back and forth in a first direction.

[0033] Compared with existing technologies, the advantages of this invention lie in its main body component, which, by placing it inside the through-hole of the wellhead, protects the internal surface of the wellhead. This prevents damage to the internal surface caused by external objects falling into the wellhead, thus ensuring the normal operation of the wellhead. Attached Figure Description

[0034] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0035] Figure 1 The three-dimensional structure of the hole protective sleeve for the through hole of the oil well tree in the embodiment of this utility model is intended to be shown.

[0036] Figure 2 yes Figure 1 Top view of the protective sleeve used for the through-hole of the oil well tree;

[0037] Figure 3 yes Figure 2 Cross-sectional view at point AA (the opening ring is stretched open);

[0038] Figure 4 yes Figure 2 Cross-sectional view at point AA (the opening ring is not stretched open);

[0039] Figure 5 yes Figure 2 A partial cross-sectional view at point BB (the opening ring is stretched open);

[0040] Figure 6 yes Figure 2 A partial cross-sectional view at point BB (the opening ring is not stretched open);

[0041] Figure 7 yes Figure 3 A magnified view of a portion of point I;

[0042] Figure 8 yes Figure 5 A magnified view of a section at point II;

[0043] Figure 9 yes Figure 4 A magnified view of a section at point III;

[0044] Figure 10 This is a schematic diagram illustrating the fit between the protective sleeve for the through hole of the oil well tree and the through hole in an embodiment of this utility model.

[0045] Figure 11 yes Figure 10 A magnified view of a portion of point A in the middle;

[0046] Figure 12 yes Figure 4 A schematic diagram of the structure of a medium-elastic shear pin.

[0047] Figure label:

[0048] 1. Elastic shear pin; 111. Spring seat; 112. Spring cavity; 113. Connecting screw; 114. First spring; 115. Shear pin; 2. Lower body; 3. Connecting pin; 4. Opening ring; 5. Upper body; 6. Sleeve; 7. Unlocking screw; 8. Positioning screw; 10. Pressure ring; 11. Anti-rotation key; 12. Second spring; 13. Anti-rotation screw; 100. Hole protection sleeve; 301. Tubing hanger bearing ring; 302. Engaging profile; 303. Wellhead through hole. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings.

[0050] The following is combined with Figures 1 to 12 As shown, this utility model provides a hole protection sleeve 100 for oil well tree through holes.

[0051] The hole protection sleeve 100 includes a body assembly, an open ring 4, and a sleeve 6. The body assembly rests on a tubing hanger support ring 301 located within the Christmas tree through-hole 303. The open ring 4 is sleeved on the outer periphery of the body assembly and rests on a limiting shoulder of the body assembly. The sleeve 6 is sleeved on the outer periphery of the body assembly. The hole protection sleeve 100 is configured such that the sleeve 6 moves along a first direction toward the open ring 4, causing the open ring 4 to open and engage with the engaging surface 302 within the Christmas tree through-hole 303.

[0052] In the above configuration, the main body component is placed inside the wellhead hole 303 to protect the internal surface of the wellhead hole 303. This prevents damage to the internal surface of the wellhead hole 303 caused by external objects falling into it, thus ensuring the normal operation of the wellhead.

[0053] It should be noted that the hole protection sleeve 100 in this application is mainly used for the through-hole of the oil tree in the underwater bedroom. The open ring 4 of the hole protection sleeve 100 engages and locks with the engaging surface 302 inside the through-hole 303 of the oil tree, thus fixing the hole protection sleeve 100. A sleeve 6 is provided to control the opening and closing of the open ring 4.

[0054] Specifically, such as Figures 1 to 11As shown, in one embodiment, the open ring 4 is provided with an opening, and the hole protection sleeve 100 is configured such that one end of its sleeve 6 extends into the open ring to expand the open ring 4 in its radial direction.

[0055] It should be noted that the opening ensures that the opening ring 4 can expand radially outward with sufficient displacement. This ensures that when the opening ring 4 is opened, it can engage with the engaging surface 302 inside the wellhead through hole 303.

[0056] Specifically, in one embodiment, the body assembly includes an upper body 5, a lower body 2, and a connecting pin 3. The lower body 2 has one end inserted into the upper body 5; the connecting pin 3 passes through both the upper body 5 and the lower body 2; a limiting shoulder is formed between the upper body 5 and the lower body 2; and the upper body 5 and the lower body 2 are fixedly connected by the connecting pin 3.

[0057] Specifically, in one embodiment, there are multiple connecting pins 3, which are spaced apart on the upper body 5 and the lower body 2.

[0058] Specifically, in one embodiment, the upper body 5 is provided with a first anti-rotation hole at one end inserted into the lower body 2, and the lower body 2 is provided with a second anti-rotation hole at the end that contacts the upper body 5. The second anti-rotation hole is provided in correspondence with the first anti-rotation hole, and an anti-rotation screw 13 is inserted into the first anti-rotation hole and the second anti-rotation hole.

[0059] In the above configuration, the anti-rotation screw 13 prevents the open ring 4 from rotating circumferentially, thus ensuring its radial expansion. This ensures its engagement with the locking surface 302 within the wellhead through-hole 303.

[0060] Specifically, in one embodiment, a positioning hole is provided at the end of the upper body 5 away from the lower body 2, and an elastic shear pin 1 is provided on the sleeve 6. When the sleeve 6 moves to the position where the opening ring 4 opens and locks on the engaging surface 302, the elastic shear pin 1 partially extends into the positioning hole.

[0061] In the above configuration, the elastic shear pin 1 can limit the axial direction of the sleeve 6, thereby preventing the sleeve 6 from moving away from the open ring 4. This, in turn, prevents the open ring 4 from retracting and disengaging from the engaging surface 302 within the tree trunk through-hole 303.

[0062] Specifically, in one embodiment, the elastic shear pin 1 includes a spring seat 111, a spring cavity 112, a connecting screw 113, a first spring 114, and a shear pin 115. The spring seat 111 is fixed to the sleeve 6; the spring cavity 112 is disposed on the spring seat 111; the connecting screw 113 fixes the spring cavity 112 to the spring seat 111; the first spring 114 is disposed within the mounting cavity defined by the spring seat 111 and the spring cavity 112; the shear pin 115 is slidably disposed within the spring cavity 112, and the shear pin 115 can extend into a positioning hole; the first spring 114 is located between the spring seat 111 and the shear pin 115, and can press the shear pin 115 tightly within the spring cavity 112. This ensures that the shear pin 115 can extend into the positioning hole. Thus, the axial limiting function of the elastic shear pin 1 is achieved, i.e., restricting the vertical movement of the sleeve 6.

[0063] Specifically, in one embodiment, an anti-rotation key assembly is provided on the outer periphery of the lower body 2. The anti-rotation key assembly cooperates with the keyway provided on the tubing hanger bearing ring 301 to prevent the hole protection sleeve 100 from rotating in the tree trunk through hole 303.

[0064] Specifically, in one embodiment, a mounting groove is provided on the outer periphery of the lower body 2, and the anti-rotation key assembly includes a pressure ring 10, an anti-rotation key 11, and a second spring 12. The pressure ring 10 is fixed to the outer periphery of the lower body 2 by screws; the anti-rotation key 11 is slidably disposed within the mounting space formed by the pressure ring 10 and the mounting groove; the second spring 12 is disposed within the anti-rotation key 11 and the mounting groove; the second spring 12 can press the anti-rotation key 11 tightly against the pressure ring 10, and when the anti-rotation key 11 is pressed against the pressure ring 10, the anti-rotation key 11 engages with the keyway, thereby achieving its anti-rotation function.

[0065] Specifically, in one embodiment, an unlocking screw 7 is provided at the end of the positioning hole away from the shear pin 115. The unlocking screw 7 is used to push the shear pin 115 out of the positioning hole. This achieves axial unlocking of the sleeve 6.

[0066] Specifically, in one embodiment, an L-shaped groove is provided at the end of the sleeve 6 away from the body assembly. The L-shaped groove is used to connect with the external hole protection sleeve 100 insertion tool. The hole protection sleeve 100 insertion tool can drive the sleeve 6 to slide back and forth in a first direction.

[0067] Specifically, in one embodiment, both the upper body 5 and the lower body 2 are provided with pin holes, and positioning screws 8 are passed through the pin holes to position the initial relative positions of the upper body 5 and the lower body 2.

[0068] It should be noted that the external feed tool and bore protection sleeve are connected, and the torque pin and J-groove are confirmed to be engaged. The bore protection sleeve is fed in, and once it is seated, the tool is slowly rotated to the left by applying a maximum torque of 4000 ft lb (5423 Nm) to engage the anti-rotation key and verify its seat. A force of approximately 70000 lb (31752 kg) is applied to shear the six brass screws (connecting pin 3) between the sleeve and the upper body, pushing the sleeve to lock the open ring into the four-piece annular groove (engaging surface 302). The feed tool is observed to descend approximately 1.57" (40 mm). A maximum super-lifting force of 20,000 lb (9072 kg) is applied to the feed string to verify the open ring locking.

[0069] It should be noted that a force of 25,000 lb (11,340 kg) is used to pull and lift the shear pin in the shear box between the shear sleeve and the upper body. The theoretical load of the shear pin in the shear box (elastic shear pin) is 45,000 lb. If the hole protection sleeve cannot be removed under this load, the load can be increased to 116,000 lb to shear the secondary release shear pin between the lower part of the hole protection sleeve and the upper body to achieve the recovery of the hole protection sleeve.

[0070] As can be seen from the above specific implementation plan, by setting up the main body component and placing it inside the through-hole of the wellhead, the internal surface of the wellhead is protected. This avoids the problem of damage to the internal surface caused by external objects falling into the wellhead, thus ensuring the normal operation of the wellhead.

[0071] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A protective sleeve for through-holes in oil wellheads, characterized in that, It includes: The main body assembly is mounted on a tubing hanger bearing ring located inside the Christmas tree through-hole; as well as An open ring, fitted onto the outer periphery of the body assembly, the open ring resting on a limiting shoulder of the body assembly; and A sleeve, which is fitted onto the outer periphery of the body assembly; The hole protection sleeve is constructed such that its sleeve moves toward the opening ring along a first direction, causing the opening ring to open and engage with the engagement surface within the through hole of the oil well.

2. The protective sleeve for the through-hole of the oil well tree according to claim 1, characterized in that, The open ring has an opening, and the hole protective sleeve is constructed such that one end of its sleeve extends into the open ring to expand the open ring in its radial direction.

3. The protective sleeve for the through-hole of the wellhead as described in claim 1, characterized in that, The body component includes: Upper body; and The lower body, one end of which is inserted into the upper body; and A connecting pin passes through the upper body and the lower body; The upper body and the lower body form a limiting shoulder, and the upper body and the lower body are fixedly connected by the connecting pin.

4. The protective sleeve for the through-hole of the oil well tree according to claim 3, characterized in that, The upper body is provided with a first anti-rotation hole at one end where it is inserted into the lower body, and a second anti-rotation hole is provided at the end where the lower body contacts the upper body. The second anti-rotation hole is provided in correspondence with the first anti-rotation hole, and anti-rotation screws are inserted into the first anti-rotation hole and the second anti-rotation hole.

5. The protective sleeve for the through-hole of the oil well tree according to claim 3, characterized in that, The upper body has a positioning hole at one end away from the lower body, and an elastic shear pin is provided on the sleeve. When the sleeve moves to the position where the opening ring opens and locks on the engaging surface, the elastic shear pin partially extends into the positioning hole.

6. The protective sleeve for the through-hole of the oil well tree according to claim 5, characterized in that, The elastic shear pin includes: Spring seat, which is fixed to the sleeve; and A spring cavity, which is disposed on the spring seat; and A connecting screw, which secures the spring cavity to the spring seat; and A first spring is disposed within a mounting cavity defined by the spring seat and the spring cavity; and A shearing pin is slidably disposed within the spring cavity, and the shearing pin can extend into the positioning hole; The first spring is located between the spring seat and the shear pin, and it can press the shear pin into the spring cavity.

7. The protective sleeve for the through-hole of the oil well tree according to claim 5, characterized in that, An anti-rotation key assembly is provided on the outer periphery of the lower body. The anti-rotation key assembly cooperates with the keyway provided on the tubing hanger bearing ring to prevent the hole protection sleeve from rotating inside the tree trunk through hole.

8. The protective sleeve for the through-hole of the wellhead according to claim 7, characterized in that, The lower body has a mounting groove on its outer periphery, and the anti-rotation key assembly includes: A pressure ring, which is fixed to the outer periphery of the lower body by screws; and An anti-rotation key, which is slidably disposed within the mounting space formed by the pressure ring and the mounting groove; and The second spring is disposed within the anti-rotation key and the mounting groove; The second spring can press the anti-rotation key onto the pressure ring. When the anti-rotation key is pressed onto the pressure ring, the anti-rotation key cooperates with the keyway.

9. The protective sleeve for the through-hole of the wellhead as described in claim 6, characterized in that, An unlocking screw is provided at the end of the positioning hole away from the shear pin, and the unlocking screw is used to push the shear pin out of the positioning hole.

10. The protective sleeve for the through-hole of the wellhead according to claim 3, characterized in that, The sleeve is provided with an L-shaped groove at the end away from the body assembly. The L-shaped groove is used to connect with an external hole protection sleeve insertion tool. The hole protection sleeve insertion tool can drive the sleeve to slide back and forth in a first direction.

Images