Split-type wellhead anti-falling object device

Abstract

This utility model belongs to the field of petroleum exploration and relates to a split-type wellhead anti-falling object device, including a first split pressure sleeve flange, a second split pressure sleeve flange, and a self-sealing core. The bottom of the first split pressure sleeve flange is fixed to the second split pressure sleeve flange, and a space is provided between the first and second split pressure sleeve flanges. The self-sealing core includes an upper ring part and a lower pipe part. The upper ring part is disposed within the space, and the lower pipe part of the self-sealing core passes through the flange hole in the middle of the second split pressure sleeve flange. This utility model solves the problem that casing overflow is difficult to detect in a timely manner due to the sealing performance of the rubber sleeve.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum exploration and relates to a split-type wellhead anti-falling object device. Background Technology

[0002] During the process of running tubing in and out of the well, due to the gap between the tubing string and the blowout preventer, small tools, cutting tools, etc. are easily fallen into the well due to unstable fixing, which can cause major quality accidents such as stuck drill bit, no progress of drill plug, and failure to retrieve bridge plug, resulting in the need for major workover operations.

[0003] To address this issue, existing technologies generally employ an integrated rubber self-sealing anti-falling object device installed on top of the blowout preventer (BOP), utilizing the "universal stretching" and sealing properties of rubber to prevent small parts from falling into the well. However, this device has a drawback: its sealing performance makes it difficult to detect casing overflows in a timely manner, increasing well control difficulty. Therefore, to address the shortcomings of existing technologies, it is necessary to develop a new type of anti-falling object device to solve the aforementioned problems and improve the safety and efficiency of downhole operations. Utility Model Content

[0004] The purpose of this invention is to provide a split-type wellhead anti-falling object device to solve the problem that casing overflow is difficult to detect in a timely manner due to the sealing performance of the rubber sleeve.

[0005] The technical solution adopted by this utility model is a split-type wellhead anti-falling object device, including a first split pressure sleeve flange, a second split pressure sleeve flange and a self-sealing core. The bottom of the first split pressure sleeve flange is fixed to the second split pressure sleeve flange, and a space is provided between the first split pressure sleeve flange and the second split pressure sleeve flange. The self-sealing core includes an upper ring part and a lower pipe part. The upper ring part is set in the space, and the lower pipe part of the self-sealing core passes through the flange hole in the middle of the second split pressure sleeve flange.

[0006] The features of this utility model also include:

[0007] Preferably, the first split compression flange is split into two identical first single flanges along the axis of symmetry.

[0008] Preferably, the second split compression flange is split into identical second single flanges along the axis of symmetry.

[0009] Preferably, the side wall of the first split compression flange is provided with a quick-connect assembly. The quick-connect assembly includes two quick-connect parts, a threaded post, and a fastening bolt. The quick-connect parts are close to the cross-section of the first single flange. One end of the quick-connect part is fixed to the outer wall of the first single flange. The other end of the quick-connect part has a groove. The width of the groove is the same as the diameter of the threaded post. One end of the threaded post is connected to the groove of one of the quick-connect parts. The other end of the threaded post is screwed with a fastening bolt. The post body is engaged in the groove of the other quick-connect part.

[0010] Preferably, the inner wall of the lower tube of the self-sealing core is provided with several annular scraping grooves along the circumference. The scraping grooves are spaced apart from top to bottom, and the inner wall between the scraping grooves is the scraping part. The depth of the scraping grooves gradually decreases from top to bottom.

[0011] Preferably, a reinforcing ring is embedded in the lower surface of the upper ring portion.

[0012] Preferably, the first split-type pressure sleeve flange has a first bolt hole on its surface, and the second split-type pressure sleeve flange has a second bolt hole on its surface. The first bolt hole and the second bolt hole are aligned and have the same inner diameter. The fixing bolts are screwed into the first bolt hole and the second bolt hole in sequence.

[0013] Preferably, the first split-type pressure sleeve flange has a first fixing hole on its surface, and the second split-type pressure sleeve flange has a second fixing hole on its surface. The first fixing hole and the second fixing hole are aligned and have the same inner diameter. The wellhead fixing bolt is screwed into the first bolt hole and the second bolt hole in sequence, and the lower end of the wellhead fixing bolt is fixed to the wellhead.

[0014] Preferably, both the upper and lower surfaces of the second split compression flange are provided with sealing gaskets.

[0015] Preferably, a sealing gasket ring is provided on the lower surface of the first split compression flange.

[0016] The beneficial effects of this utility model are as follows: This utility model consists of two symmetrical split pressure sleeve flanges and a self-sealing core. The two accessories are combined to fix the self-sealing core, thereby reducing the gap between the rubber sleeve and the outer wall of the tubing and enabling quick disassembly and assembly, thus achieving the purpose of inherent safety in well control. Attached Figure Description

[0017] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 This is an enlarged view of point A in this utility model;

[0020] Figure 3 This is a top view of the present invention;

[0021] In the figure, 1. First split pressure sleeve flange, 2. Second split pressure sleeve flange, 3. Self-sealing core, 4. Quick-connect assembly, 41. Quick-connect piece, 42. Threaded post, 43. Fastening bolt, 5. Scraper groove, 6. Scraper section, 7. Fixing bolt, 8. Wellhead fixing bolt, 9. Sealing gasket ring, 10. Reinforcing ring, 31. Upper ring section, 32. Lower pipe section. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The present invention will be described in detail with reference to specific embodiments:

[0024] A split-type wellhead anti-falling object device, reference Figures 1-3 It includes a first split-type pressure sleeve flange 1, a second split-type pressure sleeve flange 2, and a self-sealing core 3. The bottom of the first split-type pressure sleeve flange 1 is fixed to the second split-type pressure sleeve flange 2. A space is provided between the first split-type pressure sleeve flange 1 and the second split-type pressure sleeve flange 2. The self-sealing core 3 includes an upper ring part 31 and a lower tube part 32. The upper ring part 31 is disposed in the space, and the lower tube part 32 of the self-sealing core 3 passes through the flange hole in the middle of the second split-type pressure sleeve flange 2.

[0025] The first split-type pressure sleeve flange 1 and the second split-type pressure sleeve flange 2 are made of 45# material with good rigidity. The self-sealing core 3 is made of highly elastic and wear-resistant polyurethane material, and the key sealing design is made according to the relevant dimensions of the wellhead.

[0026] The first split-type pressure sleeve flange 1 and the second split-type pressure sleeve flange 2 are combined to achieve self-sealing of the self-sealing core 3, which reduces the gap between the self-sealing core 3 and the outer wall of the oil pipe, thus achieving the effect of preventing falling objects during lifting and lowering operations, and reducing oil pollution on the outer wall of the lifted oil pipe.

[0027] The first split-type pressure sleeve flange 1 is split into two identical first single-unit flanges along the axis of symmetry. The two first single-unit flanges are easier to install than the whole first split-type pressure sleeve flange 1, and can be directly assembled from both sides of the oil pipe.

[0028] The second split compression flange 2 is split into identical second single flanges along the axis of symmetry. The two second single flanges are easier to install than the single second split compression flange 2, and can be directly assembled from both sides of the oil pipe.

[0029] The first split-type pressure sleeve flange 1 and the second split-type pressure sleeve flange 2 adopt a split structure, which saves installation time. In the event of a well kick or blowout, it can buy time for the installation of the wellhead (blowout preventer assembly), which is conducive to rapid blowout control, achieving well control safety and enhancing applicability.

[0030] refer to Figure 3 The first split-type pressure sleeve flange 1 is provided with a quick-connect assembly 4 on its side wall. There are two sets of quick-connect assemblies 4, which are symmetrically arranged on the outer wall of the first split-type pressure sleeve flange 1.

[0031] The quick-connect assembly 4 includes two quick-connect pieces 41, a threaded post 42, and a fastening bolt 43. The quick-connect piece 41 is close to the cross-section of the first single flange. One end of the quick-connect piece 41 is fixed to the outer wall of the first single flange. The other end of the quick-connect piece 41 has a groove. The width of the groove is the same as the diameter of the threaded post 42. One end of the threaded post 42 is connected to the groove of one of the quick-connect pieces 41. The other end of the threaded post 42 is screwed to the fastening bolt 43. The post body of the threaded post 42 is engaged in the groove of the other quick-connect piece 41.

[0032] The quick-connect assembly 4 can quickly fix two first single flanges together. The two first single flanges are aligned with the quick-connect piece 41, the threaded post 42 is inserted into the groove of the quick-connect piece 41, and the fastening bolt 43 is screwed inward to tighten the quick-connect piece 41. One end of the bolt is inserted to press the quick-connect piece 41 together, so that the two first single flanges are assembled into a complete first split pressure sleeve flange 1 under pressure.

[0033] The inner wall of the lower tube 32 of the self-sealing core 3 has several annular scraping grooves 5 arranged circumferentially. The scraping grooves 5 are spaced apart from top to bottom. The inner wall between the scraping grooves 5 is a scraping part 6. The depth of the scraping grooves 5 gradually decreases from top to bottom. During the process of pulling out the oil pipe, the protruding scraping part 6 scrapes away the oil stains on the outer wall of the oil pipe. A frustum-shaped cavity is formed in the middle of the lower tube 32. The scraped oil stains fall from the space between the cavity and the outer wall of the oil pipe.

[0034] A reinforcing ring 9 is embedded in the lower surface of the upper ring portion 31. The reinforcing ring 9 significantly improves the overall deformation resistance of the rubber sleeve, enabling it to effectively maintain its original shape when subjected to external forces such as compression, tension, or friction, preventing excessive deformation, cracking, or damage. In applications such as rubber joints, the reinforcing ring 9 effectively resists rubber rupture caused by factors such as pipeline pressure. Furthermore, the reinforcing ring 9 disperses external pressure, impact, or vibration, avoiding stress concentration and extending the service life of the rubber sleeve. It also helps enhance the sealing performance between the rubber sleeve and other components, preventing media leakage. For example, in combined gaskets, the reinforcing ring 9 ensures that the self-sealing core 3 achieves optimal sealing. The reinforcing ring can also serve as a positioning marker or auxiliary device, improving installation accuracy and efficiency, and increasing the wear resistance of the rubber sleeve, especially providing effective protection between components that frequently contact or move relative to each other. In summary, the reinforcing ring provides additional support to the rubber sleeve, ensuring its stability under various loads and operating conditions, and allowing it to fully perform its function.

[0035] The first split-type pressure sleeve flange 1 has a first bolt hole on its surface, and the second split-type pressure sleeve flange 2 has a second bolt hole on its surface. The first bolt hole and the second bolt hole are aligned and have the same inner diameter. The fixing bolt 7 is screwed into the first bolt hole and the second bolt hole in sequence. The fixing bolt 7 assembles the first split-type pressure sleeve flange 1 and the second split-type pressure sleeve flange 2 together.

[0036] The first split-type pressure sleeve flange 1 has a first fixing hole on its surface, and the second split-type pressure sleeve flange 2 has a second fixing hole on its surface. The first fixing hole and the second fixing hole are aligned and have the same inner diameter. The wellhead fixing bolt 8 is screwed into the first bolt hole and the second bolt hole in sequence. The lower end of the wellhead fixing bolt 8 is fixed to the wellhead. The wellhead fixing bolt 8 fixes the split-type wellhead anti-falling object device in the wellhead.

[0037] The upper and lower surfaces of the second split-type pressure sleeve flange 2 are provided with sealing gaskets. The sealing gaskets are R-type metal sealing gaskets. Correspondingly, annular grooves are opened on the lower surface of the upper ring part 31 and the wellhead. The sealing gaskets are engaged into the annular grooves to complete the limiting and sealing of the second split-type pressure sleeve flange 2.

[0038] The lower surface of the first split compression flange 2 is provided with a sealing gasket ring, which is an R-type metal sealing gasket ring. Correspondingly, an annular groove is opened on the upper surface of the upper ring 31. The sealing gasket ring is engaged into the annular groove to complete the limiting and sealing of the first split compression flange 1.

[0039] The advantages of this invention are that it effectively prevents small parts from falling into the well, better straightens the tubing, and assists in scraping oil stains off the outside of the tubing. In the event of a well kick or blowout, it can buy time for installing the blowout preventer assembly, facilitating rapid emergency blowout. Essentially, it achieves well control safety and has strong applicability. Furthermore, it reduces or avoids construction costs at the wellhead due to falling object accidents, greatly reducing oilfield production costs and improving economic efficiency.

[0040] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A split-type wellhead anti-falling object device, characterized in that, It includes a first split-type pressure sleeve flange (1), a second split-type pressure sleeve flange (2) and a self-sealing core (3). The bottom of the first split-type pressure sleeve flange (1) is fixed to the second split-type pressure sleeve flange (2). There is a space between the first split-type pressure sleeve flange (1) and the second split-type pressure sleeve flange (2). The self-sealing core (3) includes an upper ring part (31) and a lower tube part (32). The upper ring part (31) is disposed in the space. The lower tube part (32) of the self-sealing core (3) passes through the flange hole in the middle of the second split-type pressure sleeve flange (2).

2. The split-type wellhead anti-falling object device according to claim 1, characterized in that, The first split compression flange (1) is split into two identical first single flanges along the axis of symmetry.

3. The split-type wellhead anti-falling object device according to claim 1, characterized in that, The second split compression flange (2) is split into the same second single flange along the axis of symmetry.

4. The split-type wellhead anti-falling object device according to claim 2, characterized in that, The first split compression flange (1) is provided with a quick-connect assembly (4) on its side wall. The quick-connect assembly (4) includes two quick-connect parts (41), a threaded post (42) and a fastening bolt (43). The quick-connect part (41) is close to the cross-section of the first single flange. One end of the quick-connect part (41) is fixed to the outer wall of the first single flange. The other end of the quick-connect part (41) is provided with a groove. The width of the groove is the same as the diameter of the threaded post (42). One end of the threaded post (42) is connected to the groove of one of the quick-connect parts (41). The other end of the threaded post (42) is screwed with a fastening bolt (43). The post body of the threaded post (42) is engaged in the groove of the other quick-connect part (41).

5. The split-type wellhead anti-falling object device according to any one of claims 1 to 4, characterized in that, The inner wall of the lower tube (32) of the self-sealing core (3) is provided with several annular scraping grooves (5) along the circumference. The scraping grooves (5) are spaced apart from top to bottom. The inner wall between the scraping grooves (5) is a scraping part (6). The depth of the scraping grooves (5) gradually decreases from top to bottom.

6. The split-type wellhead anti-falling object device according to claim 5, characterized in that, A reinforcing ring (10) is embedded on the lower surface of the upper ring (31).

7. The split-type wellhead anti-falling object device according to claim 6, characterized in that, The first split-type pressure sleeve flange (1) has a first bolt hole on its surface, and the second split-type pressure sleeve flange (2) has a second bolt hole on its surface. The first bolt hole and the second bolt hole are aligned and have the same inner diameter. The fixing bolt (7) is screwed into the first bolt hole and the second bolt hole in sequence.

8. The split-type wellhead anti-falling object device according to claim 6, characterized in that, The first split-type pressure sleeve flange (1) has a first fixing hole on its surface, and the second split-type pressure sleeve flange (2) has a second fixing hole on its surface. The first fixing hole and the second fixing hole are aligned and have the same inner diameter. The wellhead fixing bolt (8) is screwed into the first bolt hole and the second bolt hole in sequence, and the lower end of the wellhead fixing bolt (8) is fixed to the wellhead.

9. The split-type wellhead anti-falling object device according to claim 6, characterized in that, The upper and lower surfaces of the second split compression flange (2) are provided with sealing gaskets.

10. The split-type wellhead anti-falling object device according to claim 6, characterized in that, A sealing gasket ring is provided on the lower surface of the first split compression flange (1).

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