Shockproof petroleum pipe convenient to assemble

Abstract

The utility model discloses a shock -proof petroleum pipe convenient to assemble relates to petroleum equipment technical field, through the precise design's thread cooperation, multiple sealing structure and bellows and heat insulating layer, realized high sealing property, strong shock resistance, high temperature resistance, heat deformation resistance and simple and reliable assembly. Including oil pipe body and with oil pipe body cooperation's coupling, a plurality of oil pipe body is connected through a plurality of coupling, oil pipe body includes inner tube and outer tube, inner tube is located the inside of outer tube, and the middle section of inner tube is set up as bellows, and the left side of outer tube is first connecting end, and the one end of inner tube is away from the first connecting end of outer tube and extends to the outside of outer tube and forms the second connecting end corresponding with the first connecting end of outer tube.

Description

Technical Field

[0001] This utility model relates to the field of petroleum equipment technology, specifically to a shockproof oil pipe that is easy to assemble. Background Technology

[0002] Oil pipes play a crucial role in oil extraction, serving as the lifeline for maintaining oil well operations. They are responsible for transporting crude oil and natural gas from the reservoir to the surface, while also withstanding the immense pressure generated during extraction. In later-stage well maintenance and production enhancement operations, such as water injection, acidizing, and fracturing, oil pipes also play a vital role in improving oilfield recovery rates. In the fields of oil drilling, extraction, and transportation, oil pipes, as core pressure-bearing components, have long faced severe challenges under complex operating conditions: 1. Vibration and shock issues: Mechanical vibrations, formation movements, or fluid pressure fluctuations during drilling can easily lead to stress concentration at traditional rigid pipe connections, causing thread loosening, seal failure, or even pipe fracture, seriously threatening operational safety.

[0003] 2. Thermal stress deformation problem: In deep well high-temperature environments (>150℃) or heavy oil thermal recovery processes, the tubing undergoes significant thermal expansion and contraction due to drastic temperature changes. Existing single-layer tubing structures are unable to effectively compensate for deformation, causing the connection points to bear additional axial stress, accelerating seal aging and leakage.

[0004] 3. Insufficient sealing reliability: Conventional API threaded connections rely on a single conical / shoulder seal, which is prone to wear and failure under high pressure (≥70MPa) and sand-containing media. Although multi-layer sealing structures can improve sealing performance, they often reduce on-site construction efficiency due to high assembly precision requirements and complex structures.

[0005] 4. Inadequate thermal insulation performance: In cold regions or deep well operations, heat loss from the pipe wall leads to increased crude oil viscosity and decreased fluidity. Existing insulated oil pipes mostly use an external insulation layer, which easily forms "cold bridges" at the joints and has weak resistance to mechanical damage, making it difficult to meet the requirements for balanced thermal insulation of the entire pipeline.

[0006] 5. Low assembly efficiency: Vibration-resistant tubing often requires additional shock absorbers or expansion joints, resulting in redundant tubing structure and an increased number of joints. Existing segmented connections require multiple alignments and torque controls, which is time-consuming and highly dependent on worker skill.

[0007] Therefore, there is an urgent need to develop an oil pipe connection technology that combines efficient sealing, vibration resistance, temperature compensation, and convenient assembly to overcome existing bottlenecks. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide an easy-to-assemble shockproof oil pipe. Through the precise design of the threaded fit, the multiple sealing structure, the corrugated pipe and the heat insulation layer, it achieves high sealing performance, strong shock resistance, high temperature resistance, heat deformation resistance and simple and reliable assembly.

[0009] To solve the above-mentioned technical problems, the technical solution of this utility model is: a shockproof oil pipe that is easy to assemble, comprising an oil pipe body and couplings that cooperate with the oil pipe body. Multiple oil pipe bodies are connected by multiple couplings. The oil pipe body includes an inner pipe and an outer pipe. The inner pipe is located inside the outer pipe. The middle section of the inner pipe is set as a corrugated pipe. The left side of the outer pipe is a first connecting end. The end of the inner pipe located away from the first connecting end of the outer pipe extends to the outside of the outer pipe to form a second connecting end corresponding to the first connecting end of the outer pipe.

[0010] Furthermore, both ends of the outer tube are provided with sealing steps, and a sealing gasket is fixedly provided on the left end face of the outer tube.

[0011] Furthermore, a sealing block is fixedly provided on the coupling, and sealing cone surfaces corresponding to the sealing step are provided on both sides of the sealing block, forming a sealing plane between the sealing cone surfaces.

[0012] Furthermore, the inner tube and the outer tube are fixedly connected by welding, forming a sealed cavity between the inner tube and the outer tube, and the sealed cavity is filled with heat insulation material.

[0013] Furthermore, the first connecting end includes a positioning platform, and during connection, the end of the inner tube abuts against the positioning platform, the inner diameter of the positioning platform corresponding to the inner diameter of the inner tube.

[0014] Furthermore, the first connecting end also includes a first internal thread section and a second internal thread section. The first internal thread section is connected to the positioning table through a first internal sealing structure. The outer diameter of the first internal thread section is smaller than the outer diameter of the second internal thread section. One end of the second internal thread section is connected to the first internal thread section, and the other end of the second internal thread section is connected to the left end face of the outer tube through an internal sealing bevel.

[0015] Furthermore, the first inner sealing structure includes a first inner sealing cone surface, an inner sealing arc surface, and a second inner sealing cone surface connected in sequence. The first inner sealing cone surface is located on the side closer to the positioning table, and the second inner sealing cone surface is located on the side closer to the first internal thread segment. The inner sealing arc surface is used to connect the first inner sealing cone surface and the second inner sealing cone surface.

[0016] Furthermore, the second connecting end includes a first external thread segment corresponding to the first internal thread segment and a second external thread segment corresponding to the second internal thread segment. The first external thread segment is connected to the end of the inner tube through a first external sealing structure, which corresponds to the first internal sealing structure. One end of the second external thread segment is connected to the first external thread segment, and the other end of the second external thread segment is connected to the right end face of the outer tube through an external sealing bevel.

[0017] Furthermore, the first external sealing structure includes a first external sealing cone surface corresponding to the first internal sealing cone surface and a second external sealing cone surface corresponding to the second internal sealing cone surface. An external sealing platform is provided between the first external sealing cone surface and the second external sealing cone surface. A sealing groove is provided on the external sealing platform, and a sealing ring is fixedly provided in the sealing groove.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects:

[0019] 1. The quadruple sealing mechanism greatly reduces the risk of leakage at the connection, making it especially suitable for high-pressure oil transportation;

[0020] 2. The middle section of the inner tube adopts a corrugated pipe structure, which can effectively absorb vibration, impact and axial expansion and contraction deformation caused by temperature changes, and protect the connection structure.

[0021] 3. The sealed cavity formed by the thermal insulation material filling the space between the inner and outer tubes not only provides insulation, but its physical properties also help to buffer vibration and deformation stress.

[0022] 4. The combined effect of the corrugated pipe and the insulation layer effectively compensates for the difference in expansion and contraction between the inner and outer pipes caused by drastic temperature changes, prevents damage or leakage at the connection due to thermal stress, and extends the service life.

[0023] 5. The positioning platform at the first connection end ensures accurate alignment of the inner tube end, simplifying the alignment process during assembly. The coupling is fixed with a self-locking nut to prevent loosening due to vibration, thus improving the reliability of long-term use. The threaded connection and coupling design are standardized, facilitating quick on-site installation. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the shockproof oil pipe of this utility model that is easy to assemble.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the image;

[0026] Figure 3 for Figure 1 Enlarged view of part B in the image.

[0027] Reference numerals: 1. Tubing body; 2. Coupling; 3. Inner tube; 4. Outer tube; 5. First connection end;

[0028] 6. Second connecting end; 7. Sealing cavity; 21. Sealing block; 211. Sealing cone surface; 212. Sealing plane;

[0029] 41. Sealing step; 42. Sealing gasket; 51. Positioning platform; 52. First internal thread section;

[0030] 53. Second internal thread section; 54. First internal sealing structure; 55. Internal sealing bevel;

[0031] 541. First inner sealing conical surface; 542. Inner sealing arc surface; 543. Second inner sealing conical surface;

[0032] 61. First external thread section; 62. Second external thread section; 63. First external sealing structure; 64. External sealing bevel;

[0033] 631. First outer sealing cone surface; 632. Second outer sealing cone surface; 633. Sealing ring. Detailed Implementation

[0034] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] like Figure 1-3 As shown, in this embodiment, a shockproof oil pipe that is easy to assemble is provided, including an oil pipe body 1 and a coupling 2 that cooperates with the oil pipe body 1. Multiple oil pipe bodies 1 are connected by multiple couplings 2. The oil pipe body 1 includes an inner pipe 3 and an outer pipe 4. The inner pipe 3 is located inside the outer pipe 4. The middle section of the inner pipe 3 is set as a corrugated pipe (not shown in the figure). The left side of the outer pipe 4 is a first connecting end 5. The end of the inner pipe 3 located away from the first connecting end 5 of the outer pipe 4 extends to the outside of the outer pipe 4 to form a second connecting end 6 corresponding to the first connecting end 5 of the outer pipe 4.

[0036] In this embodiment, both ends of the outer tube 4 are provided with sealing steps 41, and a sealing washer 42 is fixedly provided on the left end face of the outer tube 4. A sealing block 21 is fixedly provided on the coupling 2. The two sides of the sealing block 21 are provided with sealing cone surfaces 211 corresponding to the sealing steps 41. A sealing plane 212 is formed between the sealing cone surfaces 211 on both sides. After the two oil pipe bodies 1 are connected, the first connecting end 5 and the second connecting end 6 cooperate. The right end of the second outer tube 4 abuts against the sealing washer 42 on the left side of the first outer tube 4. The coupling 2 can be fixedly set at the interface of the two oil pipe bodies 1 by a self-locking nut. At this time, the sealing cone surfaces 211 on both sides of the sealing block 21 abut against the sealing steps 41 of the pipe, and the sealing plane 212 on the sealing block 21 abuts against the outer wall of the sealing washer 42, so that the sealing performance at the connection of the two oil pipe bodies 1 is improved.

[0037] In this embodiment, the inner tube 3 and the outer tube 4 are fixedly connected by welding, forming a sealed cavity 7 between the inner tube 3 and the outer tube 4. The sealed cavity 7 is filled with heat insulation material, such as perlite powder, ultrafine glass wool, argon, krypton, xenon, etc. The heat insulation material allows the oil pipe to overcome the expansion and contraction deformation caused by temperature changes, enabling it to be used in high-temperature environments, improving its service life, and reducing heat loss, which is beneficial for the overall heat preservation of the oil pipe during drilling.

[0038] In this embodiment, the first connecting end 5 includes a positioning platform 51. When connecting, the end of the inner tube 3 abuts against the positioning platform 51, and the inner diameter of the positioning platform 51 corresponds to the inner diameter of the inner tube 3, so as to ensure that there is no protrusion or depression on the outer wall and the inner wall after the connection is completed, thus ensuring the smooth flow of fluid in the pipeline.

[0039] In this embodiment, the first connecting end 5 further includes a first internal thread section 52 and a second internal thread section 53. The first internal thread section 52 and the positioning table 51 are connected by a first internal sealing structure 54. The outer diameter of the first internal thread section 52 is smaller than the outer diameter of the second internal thread section 53. One end of the second internal thread section 53 is connected to the first internal thread section 52, and the other end of the second internal thread section 53 is connected to the left end face of the outer tube 4 through an inner sealing inclined surface 55.

[0040] In this embodiment, the first inner sealing structure 54 includes a first inner sealing cone surface 541, an inner sealing arc surface 542, and a second inner sealing cone surface 543 connected in sequence. The first inner sealing cone surface 541 is located on the side near the positioning table 51, and the second inner sealing cone surface 543 is located on the side near the first internal thread section 52. The inner sealing arc surface 542 is used to connect the first inner sealing cone surface 541 and the second inner sealing cone surface 543.

[0041] In this embodiment, the second connecting end 6 includes a first external thread section 61 corresponding to the first internal thread section 52 and a second external thread section 62 corresponding to the second internal thread section 53. The first external thread section 61 is connected to the end of the inner tube 3 through a first external sealing structure 63, which corresponds to the first internal sealing structure 54. One end of the second external thread section 62 is connected to the first external thread section 61, and the other end of the second external thread section 62 is connected to the right end face of the outer tube 4 through an external sealing inclined surface 64.

[0042] In this embodiment, the first outer sealing structure 63 includes a first outer sealing cone surface 631 corresponding to the first inner sealing cone surface 541 and a second outer sealing cone surface 632 corresponding to the second inner sealing cone surface 543. An outer sealing platform is provided between the first outer sealing cone surface 631 and the second outer sealing cone surface 632. A sealing groove is provided on the outer sealing platform. A sealing ring 633 is fixedly provided in the sealing groove. When connected, the sealing ring 633 abuts against the inner sealing arc surface 542 of the first connecting end 5.

[0043] The connection method and advantages of this utility model are as follows: the second connecting end 6 of one oil pipe body 1 is screwed into the first connecting end 5 of another oil pipe body 1, the first external thread section 61 is screwed into the first internal thread section 52, and the second external thread section 62 is screwed into the second internal thread section 53. During the tightening process, the end of the inner tube 3 finally abuts against the positioning platform 51 inside the first connecting end 5, ensuring that the inner wall of the inner tube 3 channel is smoothly aligned without protrusion or depression; when the two oil pipe bodies 1 are screwed into place, the right end face of the outer tube 4 of the second oil pipe body 1 presses against the sealing gasket 42 on the left end face of the outer tube 4 of the first oil pipe body 1, which forms the first end face seal; when the first connecting end 5 and the second connecting end 6 are tightened, the sealing ring 633 The sealing block 21 is pressed against the inner sealing arc surface 542 of the inner sealing structure of the first connecting end 5, forming a second surface contact seal to ensure the sealing performance of the inner tube 3 channel connection. The coupling 2 is fitted onto the interface where the two oil pipe bodies 1 are connected and fixed in the interface position with a self-locking nut. The sealing cone surfaces 211 on both sides of the sealing block 21 are pressed tightly against the sealing steps 41 at the ends of the two outer tubes 4, forming a third cone surface seal. The sealing plane 212 in the middle of the sealing block 21... Simultaneously, it tightly presses against the outer wall of the sealing gasket 42 on the left end face of the outer tube 4 of the first oil pipe body 1, forming a fourth planar seal, further enhancing the end face sealing effect; the quadruple sealing mechanism greatly reduces the risk of leakage at the connection, especially suitable for high-pressure oil transportation; the middle section of the inner tube 3 adopts a corrugated pipe structure, which can effectively absorb vibration, impact, and axial expansion and contraction deformation caused by temperature changes, protecting the connection structure; the sealing cavity 7 formed by the heat insulation material filled between the inner tube 3 and the outer tube 4 not only insulates the heat, but its physical properties can also help buffer vibration and deformation stress; the combined effect of the corrugated pipe and the heat insulation layer effectively compensates for the difference in expansion and contraction of the inner and outer tubes 4 caused by drastic temperature changes, preventing damage or leakage at the connection due to thermal stress, and extending the service life; the positioning platform 51 of the first connection end 5 ensures accurate alignment of the end of the inner tube 3, simplifying the alignment process during assembly; the coupling 2 is fixed with a self-locking nut to prevent loosening of the connection due to vibration, improving the reliability of long-term use; the threaded connection and the standardized design of the coupling 2 facilitate rapid on-site installation.

[0044] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shockproof oil pipe that is easy to assemble, characterized in that: The system includes a tubing body (1) and couplings (2) that cooperate with the tubing body (1). Multiple tubing bodies (1) are connected by multiple couplings (2). The tubing body (1) includes an inner tube (3) and an outer tube (4). The inner tube (3) is located inside the outer tube (4). The middle section of the inner tube (3) is set as a corrugated pipe. The left side of the outer tube (4) is a first connection end (5). The end of the inner tube (3) located away from the first connection end (5) of the outer tube (4) extends to the outside of the outer tube (4) to form a second connection end (6) corresponding to the first connection end (5) of the outer tube (4).

2. The shock-resistant oil pipe that is easy to assemble according to claim 1, characterized in that: Both ends of the outer tube (4) are provided with sealing steps (41), and a sealing gasket (42) is fixedly provided on the left end face of the outer tube (4).

3. The shockproof oil pipe that is easy to assemble according to claim 2, characterized in that: A sealing block (21) is fixedly provided on the coupling (2). The sealing block (21) has sealing cone surfaces (211) on both sides corresponding to the sealing step (41). A sealing plane (212) is formed between the sealing cone surfaces (211).

4. The shock-resistant oil pipe that is easy to assemble according to claim 1, characterized in that: The inner tube (3) and the outer tube (4) are fixedly connected by welding, and a sealed cavity (7) is formed between the inner tube (3) and the outer tube (4), and the sealed cavity (7) is filled with heat insulation material.

5. The shock-resistant oil pipe that is easy to assemble according to claim 1, characterized in that: The first connecting end (5) includes a positioning platform (51). When connected, the end of the inner tube (3) abuts against the positioning platform (51), and the inner diameter of the positioning platform (51) corresponds to the inner diameter of the inner tube (3).

6. The shock-resistant oil pipe that is easy to assemble according to claim 5, characterized in that: The first connecting end (5) further includes a first internal thread section (52) and a second internal thread section (53). The first internal thread section (52) and the positioning table (51) are connected by a first internal sealing structure (54). The outer diameter of the first internal thread section (52) is smaller than the outer diameter of the second internal thread section (53). One end of the second internal thread section (53) is connected to the first internal thread section (52), and the other end of the second internal thread section (53) is connected to the left end face of the outer tube (4) through an internal sealing inclined surface (55).

7. The shock-resistant oil pipe that is easy to assemble according to claim 6, characterized in that: The first inner sealing structure (54) includes a first inner sealing cone surface (541), an inner sealing arc surface (542), and a second inner sealing cone surface (543) connected in sequence. The first inner sealing cone surface (541) is located on the side close to the positioning table (51), and the second inner sealing cone surface (543) is located on the side close to the first internal thread section (52). The inner sealing arc surface (542) is used to connect the first inner sealing cone surface (541) and the second inner sealing cone surface (543).

8. The shockproof oil pipe that is easy to assemble according to claim 7, characterized in that: The second connecting end (6) includes a first external thread segment (61) corresponding to the first internal thread segment (52) and a second external thread segment (62) corresponding to the second internal thread segment (53). The first external thread segment (61) is connected to the end of the inner tube (3) through a first external sealing structure (63). The first external sealing structure (63) corresponds to the first internal sealing structure (54). One end of the second external thread segment (62) is connected to the first external thread segment (61), and the other end of the second external thread segment (62) is connected to the right end face of the outer tube (4) through an external sealing inclined surface (64).

9. The shockproof oil pipe that is easy to assemble according to claim 8, characterized in that: The first outer sealing structure (63) includes a first outer sealing cone (631) corresponding to the first inner sealing cone (541) and a second outer sealing cone (632) corresponding to the second inner sealing cone (543). An outer sealing platform is provided between the first outer sealing cone (631) and the second outer sealing cone (632). A sealing groove is provided on the outer sealing platform, and a sealing ring (633) is fixedly provided in the sealing groove.

Images