CN114837576A - Oil pipe sealer and oil pipe sealing connection system - Google Patents

Abstract

The application discloses oil pipe sealer and oil pipe sealing connection system belongs to oil development technical field. The oil pipe sealer (1) is an elastic pipe, wherein: the elastic pipe comprises a first pipe section (11), a second pipe section (12) and a third pipe section (13), the first pipe section (11) and the third pipe section (13) are positioned at two ends, and the second pipe section (12) is positioned between the first pipe section (11) and the third pipe section (13); the first pipe section (11) and the third pipe section (13) are straight pipe sections, the second pipe section (12) is an elastic pipe section, and the elastic deformation direction of the elastic pipe section is axial. Adopt the scheme of this application, can effectively reduce gaseous revealing from the screw thread.

Description

Tubing seals and tubing seal connection systems

technical field

The present application relates to the technical field of oil extraction, and in particular, to an oil pipe sealer and an oil pipe sealing connection system.

Background technique

The tubing used in oil and gas wells is generally connected by tubing couplings. The ends of the two oil pipes are provided with external threads, and the two ends of the oil pipe coupling are provided with internal threads, so that the ends of the two oil pipes are respectively threadedly connected with the two ends of the oil pipe coupling. This can ensure that the oil pipe connection has a certain stability.

In the process of realizing this application, the inventor found that the related art has at least the following problems:

In the inner cavity of the connection of the two oil pipes, an annular groove is formed between the end faces of the two oil pipes and the inner wall of the oil pipe coupling, which is generally called "J-shaped area". For gas wells and gas drive injection-production wells, during the high-speed flow of gas in the tubing, when it flows through the "J-shaped zone", a vortex will be formed in the "J-shaped zone", and the gas in the vortex will quickly rush to the threaded connection. In the gap, on the one hand, gas will leak at the thread, on the other hand, it will cause erosion at the thread, and then there will be more gas leakage in the future. Generally speaking, the tightness of the oil pipe connection is poor.

SUMMARY OF THE INVENTION

The embodiments of the present application provide an oil pipe sealer and an oil pipe sealing connection system, which can solve the problem of poor airtightness at the oil pipe connection. The technical solution is as follows:

In a first aspect, an oil pipe sealer 1 is provided, and the oil pipe sealer 1 is an elastic tube, wherein:

The elastic pipe includes a first pipe section 11 , a second pipe section 12 and a third pipe section 13 , the first pipe section 11 and the third pipe section 13 are located at both ends, and the second pipe section 12 is located at the first pipe section 11 and the third pipe section 13;

The first pipe section 11 and the third pipe section 13 are straight pipe sections, the second pipe section 12 is an elastic pipe section, and the elastic deformation direction of the elastic pipe section is the axial direction;

The length of the elastic tube when it is not compressed is greater than the length of the oil pipe coupling 2 minus the difference between the length of the external thread of the first oil pipe 3 and the length of the external thread of the second oil pipe 4, and the length of the elastic tube when the maximum compression is smaller than the oil pipe coupling The length of 2 minus the difference between the length of the external thread of the first oil pipe 3 and the length of the external thread of the second oil pipe 4;

The end face of the first pipe section 11 is used for contacting the end face of the first oil pipe 3;

The end face of the third pipe section 13 is used for contacting the end face of the second oil pipe 4;

The outer wall of the second pipe section 12 is used for contacting with the inner wall of the oil pipe collar 2 .

In an achievable solution, the axial section of the second pipe section 12 has a wave-shaped structure.

In an achievable solution, the wave crest portion 121 and the wave trough portion 122 of the wave-shaped structure are both semicircular.

In an achievable solution, in the wave-shaped structure, the part between the semicircle of the wave crest part 121 and the semicircle of the wave trough part 122 is perpendicular to the axis of the second pipe section 12 .

In an achievable solution, the axial section of the second pipe section 12 has a zigzag structure.

In an achievable solution, the material of the oil pipe sealer 1 includes polytetrafluoroethylene.

In an achievable solution, the outer diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal.

In an achievable solution, the inner diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal.

In an achievable solution, the inner diameter of the first pipe section 11 is equal to the inner diameter of the end face of the first oil pipe 3 , and the outer diameter of the first pipe section 11 is equal to the outer diameter of the end face of the first oil pipe 3 , the inner diameter of the third pipe section 13 is equal to the inner diameter of the end face of the second oil pipe 4 , and the outer diameter of the third pipe section 13 is equal to the outer diameter of the end face of the second oil pipe 4 .

In a second aspect, an oil pipe sealing connection system is provided. The oil pipe sealing connection system includes an oil pipe coupling 2, a first oil pipe 3, a second oil pipe 4 and the oil pipe sealer 1 according to the first aspect, wherein:

The inner wall of the oil pipe coupling 2 is provided with internal threads, the end of the first oil pipe 3 is provided with external threads, the end of the second oil pipe 4 is provided with external threads, and both ends of the oil pipe coupling 2 are provided with external threads. are respectively connected with the end of the first oil pipe 3 and the end of the second oil pipe 4 by screw thread;

The oil pipe seal 1 is compressed and installed between the end face of the first oil pipe 3 and the end face of the second oil pipe 4;

The end face of the first pipe section 11 is in contact with the end face of the first oil pipe 3;

The end face of the third pipe section 13 is in contact with the end face of the second oil pipe 4;

The outer wall of the second pipe section 12 is in contact with the inner wall of the oil pipe collar 2 .

The beneficial effects brought by the technical solutions provided in the embodiments of the present application are:

When the oil pipe sealer 1 is placed in the oil pipe coupling 2, and the two ends of the oil pipe coupling 2 are respectively connected with the first oil pipe 3 and the second oil pipe 4, the two end faces of the oil pipe sealer 1 are respectively connected with the first oil pipe 3. The end face of the second oil pipe 4 is in contact with the end face of the second oil pipe 4, the oil pipe seal 1 is elastically deformed under the extrusion of the first oil pipe 3 and the second oil pipe 4, and the end face of the first pipe section 11 and the end face of the first oil pipe 3 are formed by mutual extrusion. Sealing, the end face of the third pipe section 13 and the end face of the second oil pipe 4 are pressed against each other to form a seal, and when air pressure is input into the oil pipe, the second pipe section 12 will apply pressure to both sides under the air pressure, so that the first pipe section 11 The end face of the third pipe section 13 and the end face of the second oil pipe 4 are squeezed more closely to each other. In this way, the fast-flowing gas can be reduced near the thread gap, the erosion of the gas on the threaded connection between the oil pipe and the oil pipe coupling can be effectively reduced, and the gas leakage from the thread can be effectively reduced.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a tubing sealer provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an oil pipe sealing connection system provided by an embodiment of the present application.

illustration

1. Tubing seal 2. Tubing coupling

3. The first oil pipe 4. The second oil pipe

11. The first pipe section 12. The second pipe section

13. The third pipe section 121. The crest part

122. Valley Department

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The embodiment of the present application provides an oil pipe sealer 1. The oil pipe sealer 1 is an elastic pipe, as shown in FIG. 1, wherein: the elastic pipe includes a first pipe section 11, a second pipe section 12 and a third pipe section 13. The first pipe section 11 and the third pipe section 13 are located at both ends, and the second pipe section 12 is located between the first pipe section 11 and the third pipe section 13 . The first pipe section 11 and the third pipe section 13 are straight pipe sections, the second pipe section 12 is an elastic pipe section, and the elastic deformation direction of the elastic pipe section is the axial direction.

The first tube section 11 , the second tube section 12 and the third tube section 13 of the elastic tube may be integrally formed with elastic materials. The whole has a certain elasticity, the elastic direction is the axial direction, and it also has a certain thickness. In this way, when the oil pipe sealer 1 is installed in the oil pipe coupling and is squeezed by the oil pipes on both sides, the radial inward direction will not occur. deformation.

The lengths of the first pipe section 11 and the third pipe section 13 are short and thick, so that the oil pipe sealer 1 can be guaranteed to have a certain strength in the radial direction. certain stability. In this way, when the oil pipe seal 1 is installed between the first oil pipe 3 and the second oil pipe 4, excessive deformation or play will not occur in the radial direction.

A material with a certain elasticity can be selected, which can produce a certain deformation under the extrusion of the end faces of the oil pipe on both sides, and fully squeeze the end face of the oil pipe to strengthen the sealing. At the same time, the material should have good toughness to prevent cracking under elastic deformation. At the same time, the material should have good corrosion resistance, which can make the oil pipe sealer 1 more durable. For example, the corrosion resistance of rubber is relatively poor, so it will not be used. Based on the above requirements, the material of the oil pipe sealer 1 can be polytetrafluoroethylene or a mixture whose main component is polytetrafluoroethylene. PTFE has suitable elasticity, strong toughness and strong corrosion resistance. Of course, other materials can also be used, which are not listed here.

The length of the elastic tube when it is not compressed is greater than the length of the tubing coupling 2 minus the difference between the length of the external thread of the first tubing 3 and the length of the external thread of the second tubing 4, and the length of the elastic tube when it is at maximum compression is less than the length of the tubing coupling 2 minus the length of the external thread. The difference between the length of the male thread of the first oil pipe 3 and the length of the male thread of the second oil pipe 4 .

Because the end face of the first oil pipe 3 and the end face of the second oil pipe 4 will squeeze the elastic pipe, the length of the elastic pipe should be slightly longer than that of the first oil pipe when the first oil pipe 3 and the second oil pipe 4 are installed normally. The distance between the end face of 3 and the end face of the second oil pipe 4, that is, when the first oil pipe 3 is completely screwed into one end of the oil pipe coupling 2 and the second oil pipe 4 is completely screwed into the other end of the oil pipe coupling 2, the two oil pipes are distance between end faces. Generally, the entire inner wall of the oil pipe coupling 2 is distributed with internal threads, so the distance is equal to the length of the oil pipe coupling 2 minus the length of the external threads of the two oil pipes.

In addition, in order to ensure that the first oil pipe 3 and the second oil pipe 4 can be correctly installed with the oil pipe coupling 2, that is, the first oil pipe 3 and the second oil pipe 4 are completely screwed into the oil pipe coupling 2, it is necessary to ensure the length of the elastic pipe at the maximum compression It cannot be too long, and cannot exceed the distance between the end faces of the two oil pipes when the first oil pipe 3 is completely screwed into one end of the oil pipe coupling 2 and the second oil pipe 4 is completely screwed into the other end of the oil pipe coupling 2 .

The end face of the first pipe section 11 is used for contact with the end face of the first oil pipe 3 , the end face of the third pipe section 13 is used for contact with the end face of the second oil pipe 4 , and the outer wall of the second pipe section 12 is used for contact with the inner wall of the oil pipe coupling 2 .

During installation, the end face of the first pipe section 11 and the end face of the third pipe section 13 are the two end faces of the entire elastic pipe, the other end of the first pipe section 11 is integrally formed with one end of the second pipe section 12, and the other end of the third pipe section 13 It is integrally formed with the other end of the second pipe section. The outer wall of the second pipe section 12 is in contact with the inner wall of the tubing coupling 2 , the outer wall of the first pipe section 11 may also be in contact with the inner wall of the tubing coupling 2 , and the outer wall of the third pipe section 13 may also be in contact with the inner wall of the tubing coupling 2 . The end face and outer wall of the oil pipe sealer 1 are integrally fitted with the oil pipe and the oil pipe coupling 2 , and the first oil pipe 3 , the first pipe section 11 , the second pipe section 12 , the third pipe section 13 and the second oil pipe 4 form a communication pipeline as a whole.

The second pipe section 12 is an elastic pipe section, and its specific structure has many possible situations, and several possible situations are given below:

Case 1

The axial section of the second pipe section 12 has a zigzag structure. This structure is not shown in the drawings.

The axial section is the section where the axis of the second pipe section 12 is located.

Two circular frustum sides with the same inclination angle are formed on both sides of each wave crest. When the second pipe section 12 is compressed, all the sides of the frustum are compressed into the plane of the torus.

This structure has a larger elastic deformation space, has stronger applicability, and can provide stronger elastic force to improve the sealing between the end face of the first pipe section 11 and the end face of the first oil pipe 3 and the third pipe section. Sealing between the end face of 13 and the end face of the second oil pipe.

Case 2

The axial section of the second pipe section 12 has a wave-like structure.

As shown in FIG. 1 , the wavy structure is characterized in that it is composed of a plurality of crest portions 121 and trough portions 122 , and the crest portions 121 and trough portions 122 of the wavy structure are both semicircular (or arc-shaped, hereinafter collectively referred to as semicircle). shape). FIG. 1 is a schematic view of an axial section of a tubing sealer 1 .

Among them, it can be considered that the crest part 121 is close to the outer wall, and the trough part 122 is close to the inner wall.

In this way, compared with using a polygon, the bending angle of the material of the wave crest portion 121 and the wave valley portion 122 can be reduced, so that the damage caused by bending can be reduced. Moreover, the shape of the arc is more conducive to withstand sudden external forces. If the gas or liquid flowing through the tubing has a sudden flow rate change, or occasionally carries solid particles, the arc structure can better prevent the bending part. damage.

In addition, when the elastic tube is compressed, the adjacent crest parts 121 are close to each other, and the adjacent wave trough parts 122 are close to each other. The force and deformation of the 121 and the trough portion 122 are relatively small, which can effectively reduce the possibility of damage. Based on this feature, it can be set that the sum of the length of the first pipe section 11, the length of the third pipe section 13 and the half length of the second pipe section 12 is less than the length of the tubing coupling 2 minus the length of the external thread of the first tubing 3 and the second tubing 4. and the length of the elastic tube when it is not compressed is greater than the length of the tubing coupling 2 minus the difference between the length of the external thread of the first tubing 3 and the length of the external thread of the second tubing 4 . In this way, during installation, the end face of the first oil pipe 3 and the end face of the second oil pipe 4 will not compress the oil pipe sealer 1 excessively, and will not cause the adjacent wave crests 121 to contact and the adjacent wave troughs 122 to contact . Because of excessive compression, the peak portion 121 and the trough portion 122 will be deformed too much, and the force will be too large, which is easy to cause damage.

In an achievable solution, in the wave-shaped structure, the part between the semicircle of the wave crest part 121 and the semicircle of the wave trough part 122 is perpendicular to the axis of the second pipe section 12 .

The part where the semicircle of the crest part 121 and the semicircle of the trough part 122 are connected is a circular plane, and this plane is perpendicular to the axial direction. planes are parallel.

Under this structure, when the second pipe section 12 is compressed, the above-mentioned annular plane will be inclined, and the distance between the outer wall and the inner wall of the second pipe section 12 will be slightly reduced, but will not change basically, and will definitely not increase. Therefore, at this time, the outer wall of the second pipe section 12 will not be squeezed too much with the inner wall of the tubing coupling 2 . In this way, the oil pipe seal 1 can be prevented from falling off between the two oil pipes when compressed.

In an achievable solution, the outer diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal. The inner diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal.

The inner diameter and outer diameter of the entire oil pipe sealer 1 are equal. During installation, the outer walls of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 can fit well with the inner wall of the tubing coupling 2 , and the first pipe section 11 , the second pipe section 12 and the third pipe section 13 The inner wall forms a relatively flat surface. In this way, on the one hand, the resistance of the oil pipe sealer 1 to the fluid in the oil pipe can be reduced, and on the other hand, during installation, the side wall of the oil pipe sealer 1 and the inner wall of the oil pipe coupling 2 can be prevented from being too large after being squeezed by the two oil pipe end faces. The extrusion produces excessive displacement.

In an achievable solution, the inner diameter of the first pipe section 11 is equal to the inner diameter of the end face of the first oil pipe 3 , the outer diameter of the first pipe section 11 is equal to the outer diameter of the end face of the first oil pipe 3 , and the inner diameter of the third pipe section 13 is equal to that of the end face of the first oil pipe 3 . The inner diameter of the end face of the second oil pipe 4 is equal, and the outer diameter of the third pipe section 13 is equal to the outer diameter of the end face of the second oil pipe 4 .

During installation, the inner diameters of the first oil pipe 3, the second oil pipe 4, the first pipe section 11, the second pipe section 12 and the third pipe section 13 are all equal, so that the first oil pipe 3, the oil pipe sealer 1 and the second oil pipe 4 have the same inner diameter The inner wall forms a relatively flat surface, which can reduce the resistance of the oil pipe sealer 1 to the fluid in the oil pipe. The outer diameters of the first oil pipe 3, the second oil pipe 4, the first pipe section 11, the second pipe section 12 and the third pipe section 13 are all equal, so that the outer walls of the first pipe section 11, the second pipe section 12 and the third pipe section 13 can be The inner wall of the oil pipe coupling 2 fits well. The above-mentioned inner diameters are equal and the outer diameters are equal, then the end face of the first pipe section 11 is directly opposite to the end face of the first oil pipe 3, and the two annular end faces are exactly the same, and the end face of the third pipe section 13 and the second oil pipe 4 The end face of The two annular end faces are exactly the same, so that when the oil pipe sealer 1 is compressed, it can have better stability and is not easy to be frustrated and displaced.

The embodiment of the present application also provides an oil pipe sealing connection system. As shown in FIG. 2 , the oil pipe sealing connection system includes an oil pipe coupling 2 , a first oil pipe 3 , a second oil pipe 4 and the above-mentioned oil pipe sealer 1 , wherein : The inner wall of the oil pipe coupling 2 is provided with an internal thread, the end of the first oil pipe 3 is provided with an external thread, the end of the second oil pipe 4 is provided with an external thread, and the two ends of the oil pipe coupling 2 are respectively connected with the first oil pipe 3. The end and the end of the second oil pipe 4 are screwed together; the oil pipe sealer 1 is compressed and installed between the end face of the first oil pipe 3 and the end face of the second oil pipe 4; the end face of the first pipe section 11 is in contact with the end face of the first oil pipe 3 ; The end face of the third pipe section 13 is in contact with the end face of the second oil pipe 4 ; the outer wall of the second pipe section 12 is in contact with the inner wall of the oil pipe coupling 2 . FIG. 2 is a schematic diagram of an axial section of the oil pipe sealer 1 , the oil pipe coupling 2 , the first oil pipe 3 and the second oil pipe 4 after installation.

The following describes specific application scenarios:

Scenario 1, tubing size 2 3/8 inches, no thickening.

The embodiment of the present application provides an oil pipe sealer 1, and the oil pipe sealer 1 is an elastic pipe, wherein: the elastic pipe includes a first pipe section 11, a second pipe section 12 and a third pipe section 13, and the first pipe section 11 and the third pipe section 13 At both ends, the second pipe section 12 is located between the first pipe section 11 and the third pipe section 13 . The first pipe section 11 and the third pipe section 13 are straight pipe sections, the second pipe section 12 is an elastic pipe section, and the elastic deformation direction of the elastic pipe section is the axial direction.

The length of the first pipe section 11 is 3.2 cm, the length of the second pipe section is 29.6 cm, the length of the third pipe section is 3.2 cm, and the total length of the tubing sealer 1 in the natural placement state is 36 cm.

The first tube section 11 , the second tube section 12 and the third tube section 13 of the elastic tube may be integrally formed with elastic materials. The whole has a certain elasticity, the elastic direction is the axial direction, and it also has a certain thickness. In this way, when the oil pipe sealer 1 is installed in the oil pipe coupling and is squeezed by the oil pipes on both sides, the radial inward direction will not occur. deformation.

The lengths of the first pipe section 11 and the third pipe section 13 are short and thick, so that the oil pipe sealer 1 can be guaranteed to have a certain strength in the radial direction. certain stability. In this way, when the oil pipe seal 1 is installed between the first oil pipe 3 and the second oil pipe 4, excessive deformation or play will not occur in the radial direction.

A material with a certain elasticity can be selected, which can produce a certain deformation under the extrusion of the end faces of the oil pipe on both sides, and fully squeeze the end face of the oil pipe to strengthen the sealing. At the same time, the material should have good toughness to prevent cracking under elastic deformation. At the same time, the material should have good corrosion resistance, which can make the oil pipe sealer 1 more durable. For example, the corrosion resistance of rubber is relatively poor, so it will not be used. Based on the above requirements, the material of the oil pipe sealer 1 can be polytetrafluoroethylene or a mixture whose main component is polytetrafluoroethylene. PTFE has suitable elasticity, strong toughness and strong corrosion resistance. Of course, other materials can also be used, which are not listed here. The surface roughness of the tubing sealer 1 can be set to 3.2 μm.

The length of the elastic tube when it is not compressed is greater than the length of the tubing coupling 2 minus the difference between the length of the external thread of the first tubing 3 and the length of the external thread of the second tubing 4, and the length of the elastic tube when it is at maximum compression is less than the length of the tubing coupling 2 minus the length of the external thread. The difference between the length of the male thread of the first oil pipe 3 and the length of the male thread of the second oil pipe 4 . This difference is 25.4cm.

Because the end face of the first oil pipe 3 and the end face of the second oil pipe 4 will squeeze the elastic pipe, the length of the elastic pipe should be slightly longer than that of the first oil pipe when the first oil pipe 3 and the second oil pipe 4 are installed normally. The distance between the end face of 3 and the end face of the second oil pipe 4, that is, when the first oil pipe 3 is completely screwed into one end of the oil pipe coupling 2 and the second oil pipe 4 is completely screwed into the other end of the oil pipe coupling 2, the two oil pipes are distance between end faces. Generally, the entire inner wall of the oil pipe coupling 2 is distributed with internal threads, so the distance is equal to the length of the oil pipe coupling 2 minus the length of the external threads of the two oil pipes.

In addition, in order to ensure that the first oil pipe 3 and the second oil pipe 4 can be correctly installed with the oil pipe coupling 2, that is, the first oil pipe 3 and the second oil pipe 4 are completely screwed into the oil pipe coupling 2, it is necessary to ensure the length of the elastic pipe at the maximum compression It cannot be too long, and cannot exceed the distance between the end faces of the two oil pipes when the first oil pipe 3 is completely screwed into one end of the oil pipe coupling 2 and the second oil pipe 4 is completely screwed into the other end of the oil pipe coupling 2 .

The end face of the first pipe section 11 is used for contact with the end face of the first oil pipe 3 , the end face of the third pipe section 13 is used for contact with the end face of the second oil pipe 4 , and the outer wall of the second pipe section 12 is used for contact with the inner wall of the oil pipe coupling 2 .

During installation, the end face of the first pipe section 11 and the end face of the third pipe section 13 are the two end faces of the entire elastic pipe, the other end of the first pipe section 11 is integrally formed with one end of the second pipe section 12, and the other end of the third pipe section 13 It is integrally formed with the other end of the second pipe section. The outer wall of the second pipe section 12 is in contact with the inner wall of the tubing coupling 2 , the outer wall of the first pipe section 11 may also be in contact with the inner wall of the tubing coupling 2 , and the outer wall of the third pipe section 13 may also be in contact with the inner wall of the tubing coupling 2 . The end face and outer wall of the oil pipe sealer 1 are integrally fitted with the oil pipe and the oil pipe coupling 2 , and the first oil pipe 3 , the first pipe section 11 , the second pipe section 12 , the third pipe section 13 and the second oil pipe 4 form a communication pipeline as a whole.

The axial section of the second pipe section 12 has a wave-like structure.

As shown in FIG. 1 , the wavy structure is characterized in that it is composed of a plurality of crest portions 121 and trough portions 122 , and the crest portions 121 and trough portions 122 of the wavy structure are both semicircular (or arc-shaped, hereinafter collectively referred to as semicircle). shape).

The outer diameter of the semicircle of the crest portion 121 and the semicircle of the trough portion 122 are both 1.3 cm and 1 cm, and the distance between the adjacent crest portions 121 and the trough portions 122 is 2.3 cm. The second The distance between the troughs 122 near the ends of the pipe section 12 and the corresponding ends is 1 cm.

In this way, compared with using a polygon, the bending angle of the material of the wave crest portion 121 and the wave valley portion 122 can be reduced, so that the damage caused by bending can be reduced. Moreover, the shape of the arc is more conducive to withstand sudden external forces. If the gas or liquid flowing through the tubing has a sudden flow rate change, or occasionally carries solid particles, the arc structure can better prevent the bending part. damage.

In addition, when the elastic tube is compressed, the adjacent crest parts 121 are close to each other, and the adjacent wave trough parts 122 are close to each other. The force and deformation of the 121 and the trough portion 122 are relatively small, which can effectively reduce the possibility of damage. Based on this feature, it can be set that the sum of the length of the first pipe section 11, the length of the third pipe section 13 and the half length of the second pipe section 12 is less than the length of the tubing coupling 2 minus the length of the external thread of the first tubing 3 and the second tubing 4. and the length of the elastic tube when it is not compressed is greater than the length of the tubing coupling 2 minus the difference between the length of the external thread of the first tubing 3 and the length of the external thread of the second tubing 4 . In this way, during installation, the end face of the first oil pipe 3 and the end face of the second oil pipe 4 will not compress the oil pipe sealer 1 excessively, and will not cause the adjacent wave crests 121 to contact and the adjacent wave troughs 122 to contact . Because of excessive compression, the peak portion 121 and the trough portion 122 will be deformed too much, and the force will be too large, which is easy to cause damage.

In an achievable solution, in the wave-shaped structure, the part between the semicircle of the wave crest part 121 and the semicircle of the wave trough part 122 is perpendicular to the axis of the second pipe section 12 .

The part where the semicircle of the crest part 121 and the semicircle of the trough part 122 are connected is a circular plane, and this plane is perpendicular to the axial direction. planes are parallel.

Under this structure, when the second pipe section 12 is compressed, the above-mentioned annular plane will be inclined, and the distance between the outer wall and the inner wall of the second pipe section 12 will be slightly reduced, but will not change basically, and will definitely not increase. Therefore, at this time, the outer wall of the second pipe section 12 will not be squeezed too much with the inner wall of the tubing coupling 2 . In this way, the oil pipe seal 1 can be prevented from falling off between the two oil pipes when compressed.

In an achievable solution, the outer diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal. The inner diameters of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 are equal.

Among them, the inner diameter is 50cm, and the outer diameter is 58cm.

The inner diameter and outer diameter of the entire oil pipe sealer 1 are equal. During installation, the outer walls of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 can fit well with the inner wall of the tubing coupling 2 , and the first pipe section 11 , the second pipe section 12 and the third pipe section 13 The inner wall forms a relatively flat surface. In this way, on the one hand, the resistance of the oil pipe sealer 1 to the fluid in the oil pipe can be reduced, and on the other hand, during installation, the side wall of the oil pipe sealer 1 and the inner wall of the oil pipe coupling 2 can be prevented from being too large after being squeezed by the two oil pipe end faces. The extrusion produces excessive displacement.

In an achievable solution, the inner diameter of the first pipe section 11 is equal to the inner diameter of the end face of the first oil pipe 3 , the outer diameter of the first pipe section 11 is equal to the outer diameter of the end face of the first oil pipe 3 , and the inner diameter of the third pipe section 13 is equal to that of the end face of the first oil pipe 3 . The inner diameter of the end face of the second oil pipe 4 is equal, and the outer diameter of the third pipe section 13 is equal to the outer diameter of the end face of the second oil pipe 4 .

During installation, the inner diameters of the first oil pipe 3, the second oil pipe 4, the first pipe section 11, the second pipe section 12 and the third pipe section 13 are all equal, so that the first oil pipe 3, the oil pipe sealer 1 and the second oil pipe 4 have the same inner diameter The inner wall forms a relatively flat surface, which can reduce the resistance of the oil pipe sealer 1 to the fluid in the oil pipe. The outer diameters of the first oil pipe 3, the second oil pipe 4, the first pipe section 11, the second pipe section 12 and the third pipe section 13 are all equal, so that the outer walls of the first pipe section 11, the second pipe section 12 and the third pipe section 13 can be The inner wall of the oil pipe coupling 2 fits well. The above-mentioned inner diameters are equal and the outer diameters are equal, then the end face of the first pipe section 11 is directly opposite to the end face of the first oil pipe 3, and the two annular end faces are exactly the same, and the end face of the third pipe section 13 and the end face of the second oil pipe 4 The two annular end faces are exactly the same, so that when the oil pipe sealer 1 is compressed, it can have better stability and is not easy to be frustrated and displaced.

Scenario 2, the tubing size is 2 7/8 inches, no thickening.

Correspondingly, the inner diameter of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 is 62 cm, and the outer diameter is 66 cm, and other parameters are the same as in scenario 1.

Scenario 3, the tubing size is 3 1/2 inches without thickening.

Correspondingly, the inner diameter of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 is 76 cm, and the outer diameter is 82 cm, and other parameters are the same as those in scenario 1.

Scenario 4, the tubing size is 2 3/8 inches, with extra thickening.

Correspondingly, the inner diameter of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 is 51 m, and the outer diameter is 64 cm, and other parameters are the same as in scenario 1.

Scenario 5, the tubing size is 2 7/8 inches and thickened.

Correspondingly, the inner diameter of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 is 62 cm, and the outer diameter is 71 cm, and other parameters are the same as in scenario 1.

Scenario 6, the tubing size is 3 1/2 inches, with extra thickening.

Correspondingly, the inner diameter of the first pipe section 11 , the second pipe section 12 and the third pipe section 13 is 76 cm, and the outer diameter is 93 cm, and other parameters are the same as those in scenario 1.

When the oil pipe sealer 1 is placed in the oil pipe coupling 2, and the two ends of the oil pipe coupling 2 are respectively connected with the first oil pipe 3 and the second oil pipe 4, the two end faces of the oil pipe sealer 1 are respectively connected with the first oil pipe 3. The end face of the second oil pipe 4 is in contact with the end face of the second oil pipe 4, the oil pipe seal 1 is elastically deformed under the extrusion of the first oil pipe 3 and the second oil pipe 4, and the end face of the first pipe section 11 and the end face of the first oil pipe 3 are formed by mutual extrusion. Sealing, the end face of the third pipe section 13 and the end face of the second oil pipe 4 are pressed against each other to form a seal, and when air pressure is input into the oil pipe, the second pipe section 12 will apply pressure to both sides under the air pressure, so that the first pipe section 11 The end face of the third pipe section 13 and the end face of the second oil pipe 4 are squeezed more closely to each other. In this way, the fast-flowing gas can be reduced near the thread gap, the erosion of the gas on the threaded connection between the oil pipe and the oil pipe coupling can be effectively reduced, and the gas leakage from the thread can be effectively reduced.

All the above-mentioned optional technical solutions can be combined arbitrarily to form optional embodiments of the present disclosure, which will not be repeated here.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (10)

1. An oil pipe sealer (1), characterized in that the oil pipe sealer (1) is an elastic tube, wherein: The elastic pipe comprises a first pipe section (11), a second pipe section (12) and a third pipe section (13), the first pipe section (11) and the third pipe section (13) are located at both ends, and the first pipe section (11) and the third pipe section (13) are located at both ends. The second pipe section (12) is located between the first pipe section (11) and the third pipe section (13); The first pipe section (11) and the third pipe section (13) are straight pipe sections, the second pipe section (12) is an elastic pipe section, and the elastic deformation direction of the elastic pipe section is the axial direction; The uncompressed length of the elastic pipe is greater than the length of the oil pipe coupling (2) minus the difference between the length of the external thread of the first oil pipe (3) and the length of the external thread of the second oil pipe (4). The length is less than the length of the oil pipe coupling (2) minus the difference between the length of the external thread of the first oil pipe (3) and the length of the external thread of the second oil pipe (4); The end face of the first pipe section (11) is used for contacting the end face of the first oil pipe (3); The end face of the third pipe section (13) is used for contacting the end face of the second oil pipe (4); The outer wall of the second pipe section (12) is used to contact the inner wall of the oil pipe coupling (2). 2 . The oil pipe sealer ( 1 ) according to claim 1 , wherein the axial section of the second pipe section ( 12 ) has a wave-shaped structure. 3 . 3 . The oil pipe sealer ( 1 ) according to claim 2 , wherein the wave crest ( 121 ) and the wave trough ( 122 ) of the wave-shaped structure are both semicircular. 4 . 4. The oil pipe sealer (1) according to claim 3, characterized in that, in the wave-shaped structure, a semicircle of the wave crest (121) and a semicircle of the wave trough (122) The part in between is perpendicular to the axis of the second pipe section (12). 5. The oil pipe sealer (1) according to claim 1, characterized in that, the axial section of the second pipe section (12) has a zigzag structure. 6. The oil pipe seal (1) according to claim 1, characterized in that, the material of the oil pipe seal (1) comprises polytetrafluoroethylene. 7. The oil pipe sealer (1) according to claim 1, wherein the outer diameters of the first pipe section (11), the second pipe section (12) and the third pipe section (13) are equal . 8 . The oil pipe sealer ( 1 ) according to claim 1 , wherein the inner diameters of the first pipe section ( 11 ), the second pipe section ( 12 ) and the third pipe section ( 13 ) are equal. 9 . 9. The oil pipe sealer (1) according to claim 1, wherein the inner diameter of the first pipe section (11) is equal to the inner diameter of the end face of the first oil pipe (3), and the first pipe section (11) is equal to the inner diameter of the end face of the first oil pipe (3). 11) The outer diameter is equal to the outer diameter of the end face of the first oil pipe (3), the inner diameter of the third pipe section (13) is equal to the inner diameter of the end face of the second oil pipe (4), and the third pipe section ( The outer diameter of 13) is equal to the outer diameter of the end face of the second oil pipe (4). 10. An oil pipe sealing connection system, characterized in that the oil pipe sealing connection system comprises an oil pipe coupling (2), a first oil pipe (3), a second oil pipe (4) and any one of claims 1-9 The oil pipe sealer (1), wherein: The inner wall of the oil pipe coupling (2) is provided with an inner thread, the end of the first oil pipe (3) is provided with an outer thread, the end of the second oil pipe (4) is provided with an outer thread, and the end of the second oil pipe (4) is provided with an outer thread. Both ends of the oil pipe coupling (2) are respectively screwed with the end of the first oil pipe (3) and the end of the second oil pipe (4); The oil pipe sealer (1) is compressed and installed between the end face of the first oil pipe (3) and the end face of the second oil pipe (4); The end face of the first pipe section (11) is in contact with the end face of the first oil pipe (3); The end face of the third pipe section (13) is in contact with the end face of the second oil pipe (4); The outer wall of the second pipe section (12) is in contact with the inner wall of the oil pipe collar (2).

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