Underwater mud line casing hanger bearing structure

Abstract

The utility model discloses an underwater mud line casing hanger bearing structure, which relates to the technical field of drilling equipment and comprises a first hanger body provided with a first shoulder. A second hanger body is arranged in the first hanger body in a sleeved mode, the second hanger body is provided with a first limiting ring borne on the first circular bead, and a second circular bead is arranged on the inner wall of the second hanger body. A third hanger body is arranged in the second hanger body in a sleeved mode, a second limiting ring borne on the second circular bead is arranged on the outer wall of the third hanger body, a clamping groove is formed in the inner wall of the third hanger body and matched with a hanging assembly, and a fourth hanger body is arranged in the hanging assembly. The second hanger body, the third hanger body and the fourth hanger body are connected with the first casing pipe, the second casing pipe and the third casing pipe through the annular grooves, and the technical problems that reliable sealing and connection are difficult to achieve in the installation and use process of a traditional casing pipe hanger, consequently, equipment is frequently replaced, and the oil exploitation cost is increased are solved.

Description

Technical Field

[0001] This utility model relates to the field of marine drilling equipment technology, and in particular to a load-bearing structure for an underwater mudline casing hanger. Background Technology

[0002] In offshore drilling projects, construction in shallow sea areas is a necessary step. Traditional mudline suspension devices have design flaws, making it difficult to guarantee the high stability and reliability of the installed mudline suspension device in shallow sea areas with complex drilling environments. At the same time, environmental influences can easily lead to frequent equipment maintenance and replacement, increasing the cost of oil extraction.

[0003] In summary, designing a load-bearing structure that improves the stability and reliability of the connection between the suspension body and the suspension body is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this utility model is to provide a load-bearing structure for an underwater mudline sleeve hanger, which solves the technical problem that existing mudline suspension devices are difficult to achieve efficient sealing and connection during installation and use, leading to easy damage to the equipment.

[0005] To achieve the above objectives, this utility model provides a load-bearing structure for an underwater mudline sleeve hanger, comprising:

[0006] Preferably, the first suspension body has a first shoulder on its inner wall;

[0007] The second suspension body is located inside the first suspension body. The outer wall of the second suspension body is provided with a first limiting ring supported on the first shoulder, and the inner wall of the second suspension body is provided with a second shoulder.

[0008] The third suspension body is located inside the second suspension body. The outer wall of the third suspension body is provided with a second limiting ring supported on the second shoulder. The inner wall of the third suspension body is provided with a locking groove, which cooperates with the suspension assembly. The suspension assembly is provided with a fourth suspension body.

[0009] The inner wall of one end of the second, third, and fourth suspension bodies is provided with annular grooves, and each annular groove is supported on the first, second, and third sleeves respectively.

[0010] Preferably, the suspension assembly includes a support ring, which is sleeved on the outer periphery of the fourth suspension body. The outer periphery of the support ring is provided with a retaining ring, which includes an engaging part and a receiving part. The engaging part carries a top ring, and the outer wall of the engaging part is provided with engaging teeth that engage with engaging grooves. The diameter of the receiving part is larger than the diameter of the engaging part, and the receiving part corresponds to the position of the support ring. The inner wall of the receiving part is provided with a boss that carries the support ring.

[0011] Preferably, one end of the fourth suspension body extends outward to form an abutment surface, which is supported on the top ring.

[0012] Preferably, the sidewall of the engaging part is provided with a number of slits along its axial direction, and each slit is evenly distributed around the axis of the engaging part. The contact surface between the engaging part and the top ring is specifically an inclined surface, and the sidewall of the receiving part is provided with a number of guide holes.

[0013] Preferably, the support ring has an opening on its side wall, the support ring is specifically an elastic ring, and a plurality of support blocks are spaced apart on the outer wall of the support ring.

[0014] Preferably, the first suspension body, the second suspension body, and the third suspension body are provided with a first thread and a second thread on their inner and outer sides near the end of the first limiting ring, respectively. The first thread and the second thread have opposite thread directions. The first thread is used to connect the suspension body feeding device, and each second thread is used to cooperate with the reconnection device.

[0015] Preferably, the outer wall of the fourth suspension body is provided with a third limiting ring, which abuts against the support ring.

[0016] Preferably, the outer walls of the first limiting ring, the second limiting ring, and the third limiting ring are provided with a plurality of connecting grooves evenly distributed around the axis of the first suspension body, and the extension direction of each connecting groove is the axis direction of the first suspension body.

[0017] Preferably, a sealing ring is clamped between the first sleeve, the second sleeve, the third sleeve and each annular groove.

[0018] Compared to the aforementioned background technology, the underwater mudline casing hanger support structure provided by this utility model includes a first hanger body with a first shoulder on its inner wall, a second hanger body fitted inside the first hanger body, a first limiting ring on the outer wall of the second hanger body, the first limiting ring being supported on the first shoulder, a second shoulder on the inner wall of the second hanger body, and a third hanger body inside the second hanger body, a second limiting ring on the outer wall of the third hanger body, the second limiting ring being supported on the second shoulder, a locking groove on the inner wall of the third hanger body, a suspension assembly cooperating with the locking groove inside the third hanger body, and a fourth hanger body connected inside the suspension assembly. The lower ends of the main body, the third suspension body, and the fourth suspension body are all provided with annular grooves. Each annular groove abuts against the upper ends of the first sleeve, the second sleeve, and the third sleeve, respectively, to complete the assembly of the underwater mudline sleeve suspension structure. This application completes the connection of the suspension body assembly through the first limiting ring, the second limiting ring, and the engaging groove, and restricts the axial degree of freedom of the suspension body assembly. At the same time, the suspension body assembly is engaged with the sleeve assembly through the annular groove, further restricting the axial degree of freedom of the suspension body assembly, ensuring that this utility model has sufficient stability and reliability. This application adopts a multi-level nested assembly, which makes the installation steps more convenient, and when the parts need to be repaired, the damaged parts can be replaced in a directional manner, simplifying the maintenance difficulty and cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A cross-sectional view of the underwater mudline sleeve hanger bearing structure provided in this embodiment of the utility model;

[0021] Figure 2 This is a structural diagram of the second suspension body provided in an embodiment of the present utility model;

[0022] Figure 3 This is a structural diagram of the third suspension body provided in an embodiment of the present utility model;

[0023] Figure 4 This is a structural diagram of the fourth suspension body and suspension assembly provided in an embodiment of the present utility model;

[0024] Figure 5 This is a structural diagram of the fourth suspension body provided in an embodiment of the present utility model;

[0025] Figure 6 This is a structural diagram of the suspension assembly provided in an embodiment of the present utility model.

[0026] Wherein, 1-first suspension body; 101-first shoulder; 2-second suspension body; 201-second shoulder; 202-first limiting ring; 3-third suspension body; 301-engaging groove; 302-second limiting ring; 4-fourth suspension body; 401-third limiting ring; 5-first sleeve; 6-second sleeve; 7-third sleeve; 8-support ring; 9-locking ring; 91-engaging part; 92-accommodating part; 93-engaging tooth; 94-guide hole; 10-top ring; 11-connecting groove. Detailed Implementation

[0027] 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.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] This utility model provides a load-bearing structure for an underwater mudline sleeve hanger. Please refer to the appendix of the instruction manual. Figure 1 To be continued Figure 4The underwater mudline casing hanger support structure includes a first hanger body 1, with a first shoulder 101 on the inner wall of the first hanger body 1. A second hanger body 2 is also provided inside the first hanger body 1, with a first limiting ring 202 on the side wall of the second hanger body 2, which rests on the first shoulder 101. Similarly, a second shoulder 201 is located on the inner side wall of the second hanger body 2. A third hanger body 3 is fitted inside the second hanger body 2, with a locking groove 301 on its side wall. A fourth hanger body 4 is fitted inside the third hanger body 3, and a suspension assembly is connected to the outer periphery of the fourth hanger body 4. The suspension assembly engages with the locking groove 301, completing the first hanger body. 1. The assembly of the second suspension body 2, the third suspension body 3, and the fourth suspension body 4 is referred to as the suspension body assembly. Further, annular grooves are provided on the lower inner walls of the second suspension body 2, the third suspension body 3, and the fourth suspension body 4. The upper ends of the first sleeve 5, the second sleeve 6, and the third sleeve 7 extend into the respective annular grooves. The sleeve assembly provides additional axial support for the suspension assembly. In addition, when the first sleeve 5 is engaged with the second suspension body 2, their inner and outer walls fit together. That is, the first sleeve 5 simultaneously restricts the radial degree of freedom of the second suspension body 2. The same applies to the second sleeve 6 and the third sleeve 7. In other words, the suspension body assembly further improves the stability of the underwater mudline sleeve suspension structure.

[0030] Preferably, the cross-sections of the first shoulder 101 and the second shoulder 201 are trapezoidal, and the thickness of the first shoulder 101 and the second shoulder 201 decreases towards the axis of the first suspension body 1, so that they have an annular conical surface and a cylindrical surface. The sidewalls of the first limiting ring 202 and the second limiting ring 302 abut against the annular conical surface and the cylindrical surface. The cylindrical surface is used to restrict the radial degree of freedom of the first limiting ring 202 and the second limiting ring 302. The first limiting ring 202 and the second limiting ring 302 apply stress to the annular conical surface through the self-weight of the second suspension body 2 and the third suspension body 3. The annular conical surface is tightly fitted with the sidewalls of the first limiting ring 202 and the second limiting ring 302, thereby improving the sealing performance of the underwater mudline sleeve suspension structure.

[0031] Please refer to the instruction manual appendix. Figure 4 To be continued Figure 6A third limiting ring 401 is provided on the outer wall of the fourth suspension body 4. The suspension assembly includes a support ring 8, which is located on the outer periphery of the fourth suspension body 4 and abuts against the third limiting ring 401. A retaining ring 9 is sleeved on the outer side of the support ring 8. Preferably, the retaining ring 9 includes an engaging portion 91 and a receiving portion 92. The engaging portion 91 is located at the upper end of the retaining ring 9, and the outer wall of the engaging portion 91 is provided with engaging teeth 93. The engaging teeth 93 cooperate with the engaging groove 301 to fix the suspension assembly inside the third suspension body 3. Further, in the engaging portion 91... The upper end of the top ring 10 is held in place. The upper end of the fourth hanger body 4 extends away from its axis, so that the side wall of the fourth hanger body 4 has an abutment surface that abuts against the upper end surface of the top ring 10. The top ring 10 is used to restrict the axial degree of freedom of the fourth hanger body 4 and fix the fourth hanger body 4 inside the third hanger body 3. The receiving part 92 is provided at the lower end of the retaining ring 9. The diameter of the inner cavity of the receiving part 92 is larger than the diameter of the inner cavity of the engaging part 91, so that there is enough space to install the support ring 8. The support ring 8 extends along the inner wall of the receiving part 92. The support ring 8 has a protrusion for holding the support ring 8. Preferably, the support ring 8 is made of an elastic material, specifically a rubber ring. A plurality of support blocks are evenly distributed around the outer periphery of the support ring 8. The support blocks abut against the inner wall of the receiving part 92, clamping the support ring 8 between the receiving part 92 and the fourth hanger body 4, preventing the fourth hanger body 4 from swinging within the third hanger body 3. An opening is also provided on the side wall of the support ring 8, extending along the axial direction of the support ring 8. The support ring 8 can adjust its position according to the diameter of the fourth hanger. The diameter of the retaining ring 9 corresponds to the size of the opening on its side wall, which matches the size of the support ring 8 to ensure that the support block of the support ring 8 always abuts against the inner wall of the receiving part 92, thereby improving the applicability and reliability of the support ring 8. Furthermore, connecting holes and connecting grooves are provided on both sides of the openings of the support ring 8 and the retaining ring 9. After adjusting the support ring 8 and the retaining ring 9 to the appropriate size, connecting parts are set between the connecting holes and connecting grooves to lock the size of the support ring 8 and the retaining ring 9, ensuring that the support ring 8 can firmly clamp the fourth suspension body 4.

[0032] Please continue to refer to the instruction manual appendix. Figure 6The engaging part 91 has several slits on its side wall. Each slit extends along the axis of the first suspension body 1 to the upper port of the retaining ring 9, allowing the engaging part 91 to expand outward. Furthermore, the end faces of the engaging part 91 and the top ring 10 that abut against each other are all inclined surfaces. The inclined surface of the engaging part 91 is located inside its port. When the top ring 10 is supported on the engaging part 91, the top ring 10 is subjected to the gravity of the fourth suspension body 4. The inclined surface of the top ring 10 abuts against the inclined surface of the engaging part 91, causing the port of the engaging part 91 to expand outward. The engaging part 91 deforms, and the abutting surfaces of the engaging part 91 and the top ring 10 fit tightly together. Preferably, a sealing ring is provided between the abutting surfaces of the engaging part 91 and the top ring 10 to further enhance the sealing between the suspension assembly and the fourth suspension body 4.

[0033] Preferably, a first thread and a second thread are respectively provided on the inner and outer walls of the upper ports of the first hanger body 1, the second hanger body 2, and the third hanger body 3. Preferably, the first thread and the second thread have opposite thread directions. It should be noted that the first thread is used to connect the hanger feeding device, and the second thread is used to connect the reconnection device. When assembling each sleeve assembly and the hanger body assembly, the hanger body feeding device is inserted into the first sleeve 5 and connected with the first thread. The port of the first sleeve 5 is connected to the annular groove of the second hanger body 2. Then, the second hanger body 2 is screwed to make the first sleeve 5 and the second hanger body 2 fixedly connected. Subsequently, the second sleeve 6 is connected to the third hanger body 3, and the third sleeve 7 is connected to the fourth hanger body 4 in sequence, and the connection method is the same as that of the first hanger and the second hanger body 2.

[0034] In addition, the upper port of the second hanger body 2 is provided with a metal sealing taper, specifically, the metal sealing taper is 15°. Furthermore, the upper ports of the third hanger body 3 and the fourth hanger body 4 are also provided with metal sealing tapers, also at 15°. It should be noted that the inclined surface of the metal sealing taper of the second hanger body 2 points outward from the second hanger body 2, while the orientation of the metal sealing tapers of the third hanger body 3 and the fourth hanger body 4 is opposite to that of the second hanger body 2. When the hanger assembly is connected to the reconnection tool, each metal sealing taper abuts against the end face of the reconnection tool, so that the two have good sealing performance after connection.

[0035] Preferably, each annular groove is provided with a sealing ring on its end face. When the sleeve assembly is screwed to the bottom of the annular groove, it fits tightly with the sealing ring to ensure that the underwater mudline sleeve hanger bearing structure has sufficient sealing performance.

[0036] Please refer to the instruction manual appendix. Figure 2 To be continued Figure 5A plurality of connecting grooves 11 are evenly distributed around the axis of the first limiting ring 202, the second limiting ring 302, and the third limiting ring 401 on their sidewalls. The extension direction of each connecting groove 11 is the axial direction of the first hanger body 1. The connecting grooves 11 connect the upper and lower end faces of the first limiting ring 202, the second limiting ring 302, and the third limiting ring 401. A plurality of guide holes 94 are provided on the sidewall of the receiving part 92. The guide holes 94 are evenly distributed around the axis of the first hanger body 1. In addition, a plurality of semi-circular grooves are provided on the contact surface where the fourth hanger body 4 abuts against the top ring 10. The port of each semi-circular groove abuts against the end face of the top ring 10. During drilling operations, after the underwater mudline hanger body hanger is inserted into the well, cement slurry needs to be injected into the inner cavity of the hanger body assembly and the casing assembly, and the cement slurry can flow out again from the port of the hanger body assembly to complete the cement slurry process. The circulation of slurry ensures that the suspension body assembly is completely filled with cement slurry, improving the load strength of the well wall and reducing the cost of cement slurry. The operator injects cement slurry from the port of the suspension body assembly. After the suspension body assembly and casing assembly are completely filled, the cement slurry overflows from the bottom of the suspension body assembly to the space between the first suspension body 1 and the second suspension body 2, the second suspension body 2 and the third suspension body 3, and the third suspension body 3 and the fourth suspension body 4. Each connecting groove 11 connects the two sides of the first limiting ring 202, the second limiting ring 302, and the third limiting ring 401, allowing the cement slurry to overflow from the lower end of each suspension body assembly to the upper port of the suspension body assembly. In addition, the semi-circular groove on the contact surface and the guide hole 94 on the side wall of the receiving part 92 provide overflow channels for the cement slurry, ensuring that the overflow process of the cement slurry is efficient and stable.

[0037] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0038] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A load-bearing structure for an underwater mudline sleeve hanger, characterized in that, include: The first suspension body (1) has a first shoulder (101) on its inner wall. The second suspension body (2) is located inside the first suspension body (1). The outer wall of the second suspension body (2) is provided with a first limiting ring (202) supported on the first shoulder (101), and the inner wall of the second suspension body (2) is provided with a second shoulder (201). The third suspension body (3) is located inside the second suspension body (2). The outer wall of the third suspension body (3) is provided with a second limiting ring (302) supported on the second shoulder (201). The inner wall of the third suspension body (3) is provided with a locking groove (301). The locking groove (301) cooperates with the suspension assembly. The suspension assembly is provided with a fourth suspension body (4). The inner wall of one end of the second suspension body (2), the third suspension body (3), and the fourth suspension body (4) is provided with annular grooves, and each of the annular grooves is supported on the first sleeve (5), the second sleeve (6), and the third sleeve (7), respectively.

2. The underwater mudline sleeve suspension bearing structure according to claim 1, characterized in that, The suspension assembly includes a support ring (8), which is sleeved on the outer periphery of the fourth suspension body (4). The outer periphery of the support ring (8) is provided with a retaining ring (9). The retaining ring (9) includes a locking part (91) and a receiving part (92). The locking part (91) carries a top ring (10). The outer wall of the locking part (91) is provided with locking teeth (93). The locking teeth (93) are connected to the locking groove (301). The diameter of the receiving part (92) is larger than the diameter of the locking part (91). The receiving part (92) is positioned corresponding to the support ring (8). The inner wall of the receiving part (92) is provided with a boss that carries the support ring (8).

3. The underwater mudline sleeve suspension bearing structure according to claim 2, characterized in that, One end of the fourth suspension body (4) extends outward to form an abutment surface, which is supported on the top ring (10).

4. The underwater mudline sleeve suspension bearing structure according to claim 3, characterized in that, The sidewall of the engaging part (91) is provided with several slits along its axial direction. Each slit is evenly arranged around the axis of the engaging part (91). The contact surface between the engaging part (91) and the top ring (10) is specifically an inclined surface. The sidewall of the receiving part (92) is provided with several guide holes (94).

5. The underwater mudline sleeve suspension bearing structure according to claim 4, characterized in that, The support ring (8) has an opening on its side wall. The support ring (8) is specifically an elastic ring. The outer wall of the support ring (8) is provided with a number of support blocks at intervals.

6. The underwater mudline sleeve suspension bearing structure according to claim 2, characterized in that, The first suspension body (1), the second suspension body (2), and the third suspension body (3) are provided with a first thread and a second thread on the inner and outer sides of the end near the first limiting ring (202), respectively. The first thread and the second thread have opposite thread directions. The first thread is used to connect the suspension body feeding device, and each of the second threads is used to cooperate with the reconnection device.

7. The underwater mudline sleeve suspension bearing structure according to claim 6, characterized in that, The outer wall of the fourth suspension body (4) is provided with a third limiting ring (401), which abuts against the support ring (8).

8. The underwater mudline sleeve suspension bearing structure according to claim 7, characterized in that, The outer walls of the first limiting ring (202), the second limiting ring (302), and the third limiting ring (401) are provided with a plurality of connecting grooves (11) evenly distributed around the axis of the first suspension body (1), and the extension direction of each connecting groove (11) is the axis direction of the first suspension body (1).

9. The underwater mudline casing hanger bearing structure according to any one of claims 1-8, characterized in that, The first sleeve (5), the second sleeve (6), the third sleeve (7) and each of the annular grooves are clamped with a sealing ring.

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