A tubing and its method of manufacture and use in tubing repair

Abstract

The application discloses an oil pipe and a preparation method and application thereof in oil pipe repair, and belongs to the technical field of oil exploitation equipment accessories, and comprises an oil pipe body. The application forms a precise splicing structure through an outer ring groove one at the front end of the oil pipe body and an adjusting ring rotatably arranged at the other end. The original butt joint of multiple oil pipes in situ can be completed in the oil pipe without pulling out the whole pushed-in oil pipe. A guide block one is circumferentially arranged on the outer ring groove one, and is matched with a sawtooth groove one, an arc-shaped groove one and a positioning hook groove one which are integrated on the inner side of the adjusting ring, and a disc spring which is arranged outside the outer ring groove one, so as to form a self-locking limiting mechanism. When splicing, the sawtooth groove one can guide the smooth sliding of the guide block one into the arc-shaped groove one, and after splicing in place, the disc spring releases the elastic force to accurately push the guide block one into the positioning hook groove one to form rigid clamping.

Description

Technical Field

[0001] This invention relates to an oil pipe, as well as a method for manufacturing the oil pipe and its application in oil pipe repair, belonging to the technical field of oil extraction equipment accessories. Background Technology

[0002] During oilfield extraction and oil and gas transportation, oil pipes are subjected to long-term corrosion from sulfur-containing media, sand erosion, and formation stress, which can easily lead to pitting, cracks, or thin-wall damage in local sections. Directly replacing the entire pipe would significantly increase maintenance costs. Therefore, local repair technology has become the mainstream solution. The core of this technology is to push a single rigid section of oil pipe that matches the damaged section into the damaged location of the oil pipe, and achieve an interference fit between the oil pipe and the original oil pipe through mechanical expansion, thereby isolating the corrosive media and rebuilding the transportation channel.

[0003] In actual construction, due to factors such as deviations in the prefabricated length of the tubing and measurement errors in the actual range of the damaged section, a single section of tubing often fails to cover the damaged area completely after being pushed in. In such cases, it is necessary to extend the repair length by splicing multiple sections of tubing. Currently, tubing connection structures are divided into threaded and plug-in types. Threaded tubing requires pulling out the entire tubing that has been pushed in, then completing the splicing by screwing in the threads, followed by a second push-in of the tubing for positioning, which is time-consuming and labor-intensive. Plug-in tubing, although it can be plugged in place, has poor axial limiting effect. During the expansion process, axial movement is prone to occur at the splice, leading to gaps at the interference fit surface. Furthermore, during in-situ splicing, additional limiting is required for the tubing that has been pushed in away from the splice end. In the confined space inside the tubing, the limiting operation is difficult and the accuracy is hard to guarantee, severely restricting construction efficiency.

[0004] To address these issues, a tubing and its fabrication method were designed, along with its application in tubing repair. Summary of the Invention

[0005] The main objective of this invention is to provide an oil pipe, its manufacturing method, and its application in oil pipe repair. A precise splicing structure is formed by an outer annular groove at the front end of the oil pipe body and a rotating adjusting ring at the other end. This allows for in-situ connection of multiple oil pipe segments within the pipe without pulling out the entire pipe. A circumferential guide block on the outer annular groove, along with a serrated groove, an arc-shaped groove, and a positioning hook groove integrated inside the adjusting ring, and a disc spring outside the outer annular groove, constitute a self-locking limiting mechanism. During splicing, the serrated groove guides the guide block to slide smoothly into the arc-shaped groove. After splicing, the disc spring releases its elastic force, precisely pushing the guide block into the positioning hook groove to form a rigid lock, improving axial limiting force and effectively preventing axial movement at the splice due to medium impact and pressure fluctuations during pipe expansion and service life, ensuring sealing stability. A front-end sheath is provided at the front end of the oil pipe body. This design effectively blocks the outer ring groove, increasing the contact area between the expanded tube and the tubing. Furthermore, the positioning mechanism, comprised of the external front sheath, inclined guide groove, anti-slip block, push spring, and anti-slip texture, allows for autonomous positioning of the tubing's front end. Once the tubing reaches the target repair position, the front sheath is installed near the front end of the tubing. The push spring then pushes the anti-slip block along the inclined guide groove, ensuring a tight fit with the inner wall of the tubing. The anti-slip texture further increases frictional resistance. This eliminates the need for additional endoscopic positioning equipment or external clamps, achieving stable positioning of the tubing's front end. It solves the problems of difficult and inaccurate manual positioning in confined spaces, enhancing practicality. The sealing rings at the adjustment ring, the front sheath end sealing ring, and the elastic rubber ring at the splicing surface form a sealing barrier at the end and connection, effectively blocking the path of media leakage along the splicing gap and improving the sealing effect during use.

[0006] The objective of this invention can be achieved by adopting the following technical solution: An oil pipe includes an oil pipe body, wherein an outer annular groove is formed on the outer peripheral wall of the front end of the oil pipe body, and guide blocks are evenly distributed along the circumferential direction on the outer side of the outer annular groove, and a disc spring is sleeved and installed on the outer side of the outer annular groove. A limiting ring is welded and fixed to the inner side of the end of the oil pipe body away from the outer annular groove. An adjusting ring is sleeved and installed on the outer side of the limiting ring. A stepped groove that is compatible with each other is opened between the limiting ring and the adjusting ring. The adjusting ring is rotatably connected to the limiting ring through the stepped groove. The inner diameter of the adjusting ring is compatible with the outer diameter of the outer annular groove. The inner side of the adjusting ring is uniformly provided with a serrated groove along the circumference. The end of the serrated groove near the oil pipe body is connected to an arc-shaped groove, and the end of the arc-shaped groove away from the serrated groove is connected to a positioning hook groove. The front end of the tubing body is detachably fitted with a front end sleeve. A positioning mechanism is evenly arranged circumferentially on the outer side of the front end sleeve. The positioning mechanism is used to prevent the tubing body from continuing to slide along the initial insertion direction during the splicing process, and does not prevent the tubing body from moving in the opposite direction.

[0007] Preferably, the positioning mechanism includes an inclined guide groove evenly opened along the circumference of the front end sheath, an anti-blocking block is slidably assembled in the inclined guide groove, a push spring is connected between the anti-blocking block and the bottom of the inclined guide groove, the inclined guide groove is inclined along the reverse movement direction of the oil pipe body, so that the anti-blocking block forms a stop with the inner wall of the pipe when the oil pipe body moves in the initial insertion direction, and can compress the push spring and retract into the inclined guide groove when moving in the reverse direction.

[0008] Preferably, the number of guide blocks is 4, and the shape of the guide blocks is cylindrical.

[0009] Preferably, the rear end of the oil pipe body is detachably fitted with a rear end sleeve, and a second guide block is evenly provided on the outer side of the rear end sleeve along the circumference. The structure of the second guide block is the same as that of the first guide block. An elastic rubber ring is fitted on the outer side of the rear end sleeve, and the elastic rubber ring is in contact with the end face of the adjusting ring.

[0010] Preferably, the inner sidewall of the front end of the front end sheath is provided with a second serrated groove, a second arc-shaped groove, and a second positioning hook groove, which are connected in sequence, and the second serrated groove, the second arc-shaped groove, and the second positioning hook groove are structurally consistent with the first serrated groove, the first arc-shaped groove, and the first positioning hook groove, respectively.

[0011] Preferably, the inner sidewall of the end face of the front sheath is provided with an inner ring groove, the end of the outer ring groove one is provided with an outer ring groove two that is adapted to the inner ring groove, and a sealing ring two is sleeved on the outer side of the outer ring groove two, and the sealing ring two is in contact with the end face of the front sheath.

[0012] Preferably, the number of the anti-slip blocks corresponds one-to-one with the inclined guide grooves, and the outer surface of the anti-slip blocks is provided with anti-slip textures. The anti-slip textures are unidirectional inclined teeth, and the inclination direction of the teeth is opposite to the initial insertion direction of the oil pipe body.

[0013] Preferably, the outer wall of the adjusting ring is provided with an annular mounting groove, and a sealing ring is fitted in the annular mounting groove, the sealing ring being tightly fitted to the outer peripheral wall of the oil pipe body.

[0014] The present invention also provides a method for preparing an oil pipe, comprising the following steps: Step 1: The outer peripheral wall of the front end of the tubing body is machined by CNC turning of the outer annular groove one, and the end of the outer annular groove one is machined by CNC turning of the outer annular groove two. Then, a disc spring is installed on the outside of the outer annular groove one, and the guide block one is uniformly machined circumferentially on the outside of the outer annular groove one by milling. Step 2: CNC turn the sawtooth groove, arc groove and positioning hook groove on the inner side of the adjusting ring. Install the sealing ring in the annular mounting groove of the adjusting ring. Place the adjusting ring on the outside of the limiting ring. Then fix the limiting ring to the inner side of the oil pipe body away from the outer annular groove by welding. Step 3: Machining the front end sleeve. Machining an inner ring groove, a second serrated groove, a second arc groove, and a second positioning hook groove on the inner side wall of the front end sleeve. Assembling a second sealing ring in the second outer ring groove. Machining an oblique guide groove on the outer peripheral wall of the front end sleeve. Assembling the push spring and the anti-slip block in the oblique guide groove to complete the assembly of the positioning mechanism. Step 4: Process the rear end sheath and mill guide block 2 on its outer wall, and put the elastic rubber ring on the rear end sheath. Then align the rear end sheath with the rear end of the tubing body. The guide block 2 slides in the serrated groove 1, the arc groove 1 and the positioning hook groove 1. The elastic force of the elastic rubber ring is used to lock the guide block 2 in the positioning hook groove 1, thus completing the overall preparation.

[0015] This invention also provides an application of an oil pipe in oil pipe repair, comprising the following steps: Step 1: Use a pipe endoscope to inspect the entire damaged oil pipe to determine the specific location, length and inner wall roundness deviation of the damaged section. Then, mechanically scrape the inner wall of the oil pipe to remove scale, clean it with high-pressure water jet and remove rust with a wire brush. For locally deformed sections, use a mechanical shaper to perform radial correction to ensure that there are no obvious protrusions or burrs on the inner wall of the oil pipe. Step 2: Remove the front and rear sheaths, and smoothly push the single-section tubing body into the tubing along the initial insertion direction. Then, from the opposite end of the insertion, insert the front sheath to the end of the tubing body. After installation, the push spring in the positioning mechanism on the outside of the front sheath releases the preload, pushing the anti-slip block to extend along the inclined guide groove. The one-way anti-slip texture on the outer surface of the anti-slip block fits tightly with the inner wall of the tubing, forming a stop fit to prevent the tubing from continuing to slide along the initial insertion direction, thus completing the automatic positioning of the front end of the tubing without the need for additional limiting fixtures. Step 3: If the length of a single section of tubing is insufficient to completely cover the damaged area, push the second section of tubing in from the other end of the tubing, so that the guide block one on the outer side of the outer annular groove one at the front end of the second section of tubing is aligned with the serrated groove one on the inner side of the adjusting ring of the first section of tubing. Continue to push the second section of tubing at a constant speed. The guide block one slides along the groove wall of the serrated groove one, causing the adjusting ring to rotate along the stepped groove of the limiting ring until the guide block one slides into the arc groove one. Step 4: When the second section of the oil pipe is pushed to the preset splicing position, the disc spring releases the pre-compression elastic force, pushes the adjusting ring to move axially, and accurately pushes the guide block one from the arc groove one into the positioning hook groove one, forming an axial rigid limit, and completing the in-situ splicing of the two sections of the oil pipe. If it is necessary to further extend the repair length, repeat steps 3-4 to achieve continuous splicing of multiple sections of the oil pipe. Step 5: Insert the rear end sheath into the rear end of the tubing body, slide the guide block two in the serrated groove one, the arc groove one and the positioning hook groove one, and use the elastic force of the elastic rubber ring to lock the guide block two inside the positioning hook groove one. Step 6: Using a portable mechanical tube expander, the spliced ​​oil pipe is expanded progressively from one end to the other, so that the outer walls of the oil pipe body, the front end sheath, and the rear end sheath are tightly pressed against the inner wall of the oil pipe. At the same time, sealing ring one, sealing ring two, and the elastic rubber ring form multiple seals to block the leakage path of the medium.

[0016] The beneficial effects of this invention are as follows: This invention provides an oil pipe, its preparation method, and its application in oil pipe repair. Through an outer ring groove at the front end of the oil pipe body, a precise splicing structure is formed with an adjusting ring rotatably set at the other end. This eliminates the need to pull out the entire oil pipe that has already been pushed in, allowing for in-situ docking of multiple oil pipe segments inside the pipe. Furthermore, a guide block circumferentially located on the outer ring groove, along with a serrated groove, an arc-shaped groove, and a positioning hook groove integrated within the adjusting ring, and a disc spring outside the outer ring groove, constitute a self-locking limiting mechanism. During splicing, the serrated groove guides the guide block to slide smoothly into the arc-shaped groove. After splicing, the disc spring releases its elastic force, precisely pushing the guide block into the positioning hook groove to form a rigid lock, improving axial limiting force and effectively preventing axial movement at the splice due to medium impact and pressure fluctuations during the pipe expansion process and service life, ensuring sealing stability. By installing a front sleeve at the front end of the tubing body, the outer annular groove can be blocked, increasing the contact area between the tubing and the tubing after expansion. In addition, the positioning mechanism composed of the front sleeve, inclined guide groove, anti-slip block, push spring, and anti-slip texture can achieve autonomous positioning of the front end of the tubing body. After the tubing body moves to the target repair position, the front sleeve is installed from the front end of the tubing body. Then, the push spring pushes the anti-slip block to extend along the inclined side of the inclined guide groove and fit tightly against the inner wall of the tubing. The anti-slip texture increases the frictional resistance. Without the need for additional endoscopic positioning equipment or external clamping fixtures, the front end of the tubing can be stably positioned. This solves the pain points of difficult and inaccurate manual positioning in confined spaces, making it more practical. By adjusting the sealing ring 1 at the ring, the sealing ring 2 at the end of the front sheath, and the elastic rubber ring at the splicing surface, a sealing barrier is formed at the end and the connection, effectively blocking the path of media leakage along the splicing gap and improving the sealing effect during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the oil pipe of the present invention; Figure 2 This is a front sectional view of the oil pipe of the present invention; Figure 3 This is a cross-sectional view of the tail end splicing state of the present invention; Figure 4 This is the main view of the front-end splicing state of the present invention; Figure 5 This is a schematic diagram of the limiting ring structure of the present invention; Figure 6 This is a front view of the front sheath of the present invention; Figure 7 This is a cross-sectional view of the front sheath of the present invention; Figure 8 This is a front view of the rear sheath of the present invention; Figure 9 This is a schematic diagram of the anti-slip block structure of the present invention.

[0018] In the diagram: 1. Oil pipe body; 2. Limiting ring; 3. Adjusting ring; 301. Sealing ring one; 4. Serrated groove; 5. Arc groove; 6. Positioning hook groove; 7. Outer ring groove; 8. Disc spring; 9. Guide block; 10. Front end sleeve; 1001. Serrated groove II; 1002. Arc groove II; 1003. Positioning hook groove II; 1004. Inner ring groove; 1005. Outer ring groove II; 1006. Sealing ring II; 11. Positioning mechanism; 1101. Inclined guide groove; 1102. Anti-slip block; 1103. Push spring; 1104. Anti-slip texture; 12. Rear end sleeve; 13. Guide block two; 14. Elastic rubber ring. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] like Figures 1-9 As shown, this embodiment provides an oil pipe, including an oil pipe body 1. An outer annular groove 7 is provided on the outer peripheral wall of the front end of the oil pipe body 1. Guide blocks 9 are evenly distributed along the circumferential direction on the outer side of the outer annular groove 7, and a disc spring 8 is sleeved and installed on the outer side of the outer annular groove 7. A limiting ring 2 is welded and fixed on the inner side of the end of the tubing body 1 away from the outer annular groove 7. An adjusting ring 3 is sleeved on the outer side of the limiting ring 2. A stepped groove that is compatible with each other is opened between the limiting ring 2 and the adjusting ring 3. The adjusting ring 3 is rotatably connected to the limiting ring 2 through the stepped groove. The inner diameter of the adjusting ring 3 is compatible with the outer diameter of the outer annular groove 7. The inner side of the adjusting ring 3 is uniformly provided with a serrated groove 4 along the circumference. The end of the serrated groove 4 near the oil pipe body 1 is connected to an arc-shaped groove 5. The end of the arc-shaped groove 5 away from the serrated groove 4 is connected to a positioning hook groove 6. The front end of the tubing body 1 is detachably fitted with a front end sleeve 10. A positioning mechanism 11 is evenly arranged on the outer side of the front end sleeve 10 along the circumferential direction. The positioning mechanism 11 is used to prevent the tubing body 1 from continuing to slide along the initial insertion direction during the splicing process, and does not prevent the tubing body 1 from moving in the opposite direction.

[0021] When multiple sections of tubing need to be spliced, there is no need to pull out the tubing body 1 that has been pushed into the tubing. Simply install the front end sheath 10 onto the front end of the tubing body 1. The outer positioning mechanism 11 achieves autonomous limiting through elastic drive. Then, align the guide block 9 of the second section of tubing with the serrated groove 4 inside the adjusting ring 3 of the first section of tubing. When pushing the second section of tubing, the guide block 9 slides along the inclined groove wall of the serrated groove 4. With the help of the low resistance characteristics of the cylindrical structure, the adjusting ring 3 is driven to rotate smoothly around the limiting ring 2 through the stepped groove until the guide block 9 slides into the arc groove 5. At this time, the disc spring 8, which is in a pre-compressed state, releases its elastic force and pushes the adjusting ring 3 to move axially, accurately pushing the guide block 9 into the positioning hook groove 6, forming an axial rigid limit, avoiding axial movement at the splice due to medium impact or tube expansion, and ensuring splice stability.

[0022] In this embodiment, the positioning mechanism 11 includes an inclined guide groove 1101 evenly opened along the circumference of the front end sheath 10. An anti-sliding block 1102 is slidably assembled in the inclined guide groove 1101. A push spring 1103 is connected between the anti-sliding block 1102 and the bottom of the inclined guide groove 1101. The inclined guide groove 1101 is inclined along the reverse movement direction of the oil pipe body 1, so that the anti-sliding block 1102 forms a stop with the inner wall of the pipe when the oil pipe body 1 moves along the initial insertion direction. When moving in the reverse direction, the push spring 1103 can be compressed and retracted into the inclined guide groove 1101.

[0023] When the tubing body 1 moves along the initial insertion direction, the anti-sliding block 1102 extends out of the inclined guide groove 1101 under the pre-pressure of the push spring 1103, and its outer end contacts the inner wall of the tubing. The inclined structure of the inclined guide groove 1101 prevents the anti-sliding block 1102 from retracting into the inclined guide groove 1101, forming a rigid stop and preventing the tubing body 1 from moving forward. When it is necessary to move the tubing body 1 in the opposite direction, the inner wall of the tubing generates reverse pressure on the anti-sliding block 1102. This pressure is decomposed into a component force pointing to the bottom of the groove along the inclined direction of the inclined guide groove 1101, compressing the push spring 1103 and causing the anti-sliding block 1102 to retract into the inclined guide groove 1101, without hindering the reverse movement of the tubing body 1, thus realizing the function of unidirectional limit and reverse adjustment.

[0024] In this embodiment, there are 4 guide blocks 9, and the shape of the guide blocks 9 is cylindrical.

[0025] Four cylindrical guide blocks 9 are evenly distributed around the outer ring groove 7, forming a symmetrical force-bearing structure to ensure balanced force during splicing. During the splicing process, the cylindrical surface of the guide block 9 contacts the groove wall of the serrated groove 4. Utilizing the guiding characteristics of the arc surface, the sliding resistance is reduced, allowing the guide block 9 to smoothly slide into the arc groove 5 along the serrated groove 4. After entering the arc groove 5, the guide block 9 drives the adjusting ring 3 to rotate around the stepped groove of the limiting ring 2 until it reaches the entrance of the positioning hook groove 6. The disc spring 8 releases its elastic force to push the adjusting ring 3 to move axially, locking the guide block 9 into the positioning hook groove 6. The cylindrical structure ensures that the guide block 9 fully fits the inner wall of the positioning hook groove 6, improving the stability of the axial limit and preventing movement at the splicing point.

[0026] In this embodiment, the rear end of the oil pipe body 1 is detachably fitted with a rear end sleeve 12. The outer side of the rear end sleeve 12 is uniformly provided with guide blocks 2 13 along the circumferential direction. The structure of guide block 2 13 is the same as that of guide block 1 9. An elastic rubber ring 14 is fitted on the outer side of the rear end sleeve 12, and the elastic rubber ring 14 is in contact with the end face of the adjusting ring 3.

[0027] When installing the rear end sleeve 12, align the guide block 13 with the serrated groove 4 of the adjusting ring 3, and push the rear end sleeve 12 so that the guide block 13 slides along the serrated groove 4 and the arc groove 5. During this process, the elastic rubber ring 14 is compressed and generates a reverse elastic force. When the guide block 13 reaches the positioning hook groove 6, the elastic force of the elastic rubber ring 14 pushes the rear end sleeve 12 to move axially, so that the guide block 13 is locked in the positioning hook groove 6, thus fixing the rear end sleeve 12. The elastic rubber ring 14 provides locking power for the guide block 13 on the one hand, and fills the gap between the rear end sleeve 12 and the adjusting ring 3 on the other hand, forming the first sealing barrier.

[0028] In this embodiment, the inner sidewall of the front end of the front end sheath 10 is sequentially provided with a serrated groove 1001, an arc groove 1002 and a positioning hook groove 1003, and the serrated groove 1001, the arc groove 1002 and the positioning hook groove 1003 are structurally consistent with the serrated groove 4, the arc groove 5 and the positioning hook groove 6, respectively.

[0029] The serrated groove 1001, the arc groove 1002, and the positioning hook groove 1003 provided on the inner wall of the front sleeve 10 can ensure the stable positioning of the front sleeve 10 during installation.

[0030] In this embodiment, an inner ring groove 1004 is provided on the inner sidewall of the end face of the front sleeve 10, and an outer ring groove 1005 adapted to the inner ring groove 1004 is provided at the end of the outer ring groove 1005. A sealing ring 1006 is sleeved on the outer side of the outer ring groove 1005, and the sealing ring 1006 is in contact with the end face of the front sleeve 10.

[0031] When installing the front sleeve 10, the inner ring groove 1004 and the outer ring groove 1005 are precisely aligned, and the sealing ring 1006 can seal the annular cavity formed by the two grooves, blocking the path of leakage of the medium from the joint surface. After the tube is expanded, the front sleeve 10 fits tightly against the inner wall of the oil pipe, further compressing the sealing ring 1006 and improving the sealing effect.

[0032] In this embodiment, the number of anti-slip blocks 1102 corresponds one-to-one with the inclined guide grooves 1101. The outer surface of the anti-slip block 1102 is provided with anti-slip textures 1104. The anti-slip textures 1104 are unidirectional inclined teeth, and the inclination direction of the teeth is opposite to the initial insertion direction of the oil pipe body 1.

[0033] When the anti-slip block 1102 is in contact with the inner wall of the oil pipe, the teeth of the anti-slip pattern 1104 form an interlocking contact with the inner wall of the oil pipe, increasing the coefficient of friction. When the oil pipe body 1 has a tendency to slide forward, the inclined surface of the teeth generates an interaction force with the inner wall of the oil pipe, further enhancing the stopping effect and preventing the oil pipe body 1 from shifting due to the impact or vibration of the medium inside the pipe. When moving in the opposite direction, the other side of the teeth is a smooth inclined surface, which can reduce frictional resistance and ensure smooth adjustment.

[0034] In this embodiment, an annular mounting groove is provided on the outer side wall of the adjusting ring 3, and a sealing ring 301 is assembled in the annular mounting groove. The sealing ring 301 is tightly fitted to the outer peripheral wall of the oil pipe body 1.

[0035] The sealing ring 301 is located in the annular gap between the adjusting ring 3 and the oil pipe body 1. Under normal conditions, it has already formed a pre-seal with the inner walls of the two. During the expansion process, the oil pipe body 1 expands radially, which drives the adjusting ring 3 to move outward synchronously, so that the sealing ring 301 is further squeezed, filling the tiny gap between the adjusting ring 3 and the oil pipe body 1, blocking the leakage of the medium along the mating surface of the adjusting ring 3 and the oil pipe body 1, and forming an end sealing barrier.

[0036] like Figures 1-9 As shown in the figure, this embodiment provides a method for preparing an oil pipe, the process of which is as follows: Step 1: The outer peripheral wall of the front end of the tubing body 1 is machined by CNC turning of the outer ring groove 7, and the outer ring groove 2 1005 is machined by CNC turning at the end of the outer ring groove 7. Then, the disc spring 8 is installed on the outside of the outer ring groove 7, and the guide block 9 is uniformly machined along the circumference on the outside of the outer ring groove 7 by milling. Step 2: The sawtooth groove 4, arc groove 5 and positioning hook groove 6 on the inner side of the adjusting ring 3 are machined by CNC turning. The sealing ring 301 is installed in the annular mounting groove of the adjusting ring 3. The adjusting ring 3 is sleeved on the outside of the limiting ring 2. Then, the limiting ring 2 is fixed to the inner side of the end of the oil pipe body 1 away from the outer annular groove 7 by welding. Step 3: Machining the front end sleeve 10, machining an inner ring groove 1004, a second serrated groove 1001, a second arc groove 1002 and a second positioning hook groove 1003 on the inner side wall of the front end sleeve 10, and assembling a second sealing ring 1006 in the second outer ring groove 1005; machining an inclined guide groove 1101 on the outer peripheral wall of the front end sleeve 10, and assembling the push spring 1103 and the anti-sliding block 1102 in the inclined guide groove 1101 to complete the assembly of the positioning mechanism 11; Step 4: Process the rear end sheath 12 and mill the guide block 13 on its outer wall, and put the elastic rubber ring 14 on the rear end sheath 12. Then align the rear end sheath 12 with the rear end of the oil pipe body 1. The guide block 13 slides in the serrated groove 4, the arc groove 5 and the positioning hook groove 6. The elastic force of the elastic rubber ring 14 is used to lock the guide block 13 in the positioning hook groove 6, thus completing the overall preparation.

[0037] like Figures 1-9 As shown in the figure, this embodiment provides an application process of oil pipe in oil pipe repair as follows: Step 1: Use a pipe endoscope to inspect the entire damaged oil pipe to determine the specific location, length and inner wall roundness deviation of the damaged section. Then, mechanically scrape the inner wall of the oil pipe to remove scale, clean it with high-pressure water jet and remove rust with a wire brush. For locally deformed sections, use a mechanical shaper to perform radial correction to ensure that there are no obvious protrusions or burrs on the inner wall of the oil pipe. Step 2: Remove the front sleeve 10 and the rear sleeve 12, and smoothly push the single-section oil pipe body 1 into the oil pipe along the initial insertion direction. Then, from the opposite end of the insertion, insert the front sleeve 10 into the end of the oil pipe body 1. After installation, the push spring 1103 in the positioning mechanism 11 on the outside of the front sleeve 10 releases the preload, pushing the anti-slip block 1102 to extend along the inclined guide groove 1101. The one-way anti-slip texture 1104 on the outer surface of the anti-slip block 1102 fits tightly with the inner wall of the oil pipe to form a stop fit, preventing the oil pipe from continuing to slide along the initial insertion direction, thus completing the automatic positioning of the front end of the oil pipe without the need for additional limiting fixtures. Step 3: If the length of a single section of tubing is insufficient to completely cover the damaged area, push the second section of tubing in from the other end of the tubing, so that the guide block 9 on the outer side of the outer annular groove 7 at the front end of the second section of tubing is aligned with the serrated groove 4 on the inner side of the adjusting ring 3 of the first section of tubing. Continue to push the second section of tubing at a constant speed. The guide block 9 slides along the groove wall of the serrated groove 4, causing the adjusting ring 3 to rotate along the stepped groove of the limiting ring 2 until the guide block 9 slides into the arc groove 5. Step 4: When the second section of the oil pipe is pushed to the preset splicing position, the disc spring 8 releases the pre-compression elastic force, pushes the adjusting ring 3 to move axially, and precisely pushes the guide block 9 from the arc groove 5 into the positioning hook groove 6 to form an axial rigid limit, thus completing the in-situ splicing of the two sections of the oil pipe. If it is necessary to further extend the repair length, repeat steps 3-4 to achieve continuous splicing of multiple sections of the oil pipe. Step 5: Insert the rear end sheath 12 into the rear end of the tubing body 1, and slide the guide block 2 13 in the serrated groove 1 4, the arc groove 1 5 and the positioning hook groove 1 6. Use the elastic force of the elastic rubber ring 14 to lock the guide block 2 13 inside the positioning hook groove 1 6. Step 6: Using a portable mechanical tube expander, the spliced ​​oil pipe is expanded progressively from one end to the other, so that the outer peripheral walls of the oil pipe body 1, the front end sheath 10 and the rear end sheath 12 are tightly press-fitted with the inner wall of the oil pipe. At the same time, the sealing ring 301, the sealing ring 1006 and the elastic rubber ring 14 form a multiple seal to block the leakage path of the medium.

[0038] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. An oil pipe, comprising an oil pipe body (1), characterized in that: The outer peripheral wall of the front end of the oil pipe body (1) is provided with an outer ring groove (7), and guide blocks (9) are evenly distributed along the circumferential direction on the outer side of the outer ring groove (7), and a disc spring (8) is sleeved on the outer side of the outer ring groove (7). A limiting ring (2) is welded and fixed on the inner side of the end of the oil pipe body (1) away from the outer ring groove (7). An adjusting ring (3) is sleeved on the outer side of the limiting ring (2). A stepped groove that is compatible with each other is opened between the limiting ring (2) and the adjusting ring (3). The adjusting ring (3) is rotatably connected to the limiting ring (2) through the stepped groove. The inner diameter of the adjusting ring (3) is compatible with the outer diameter of the outer ring groove (7). The inner side of the adjusting ring (3) is uniformly provided with a serrated groove (4) along the circumference. The end of the serrated groove (4) near the oil pipe body (1) is connected to an arc groove (5), and the end of the arc groove (5) away from the serrated groove (4) is connected to a positioning hook groove (6). The front end of the oil pipe body (1) is detachably fitted with a front end sleeve (10). A positioning mechanism (11) is uniformly arranged on the outer side of the front end sleeve (10) along the circumferential direction. The positioning mechanism (11) is used to prevent the oil pipe body (1) from continuing to slide along the initial insertion direction during the splicing process, and does not prevent the oil pipe body (1) from moving in the opposite direction.

2. The oil pipe according to claim 1, characterized in that: The positioning mechanism (11) includes a slanted guide groove (1101) evenly opened along the circumference of the front end sheath (10). An anti-slip block (1102) is slidably assembled in the slanted guide groove (1101). A push spring (1103) is connected between the anti-slip block (1102) and the bottom of the slanted guide groove (1101). The slanted guide groove (1101) is inclined along the reverse movement direction of the oil pipe body (1), so that the anti-slip block (1102) forms a stop with the inner wall of the pipe when the oil pipe body (1) moves along the initial insertion direction. When moving in the reverse direction, the push spring (1103) can be compressed and retracted into the slanted guide groove (1101).

3. The oil pipe according to claim 1, characterized in that: The number of guide blocks (9) is 4, and the shape of guide blocks (9) is cylindrical.

4. The oil pipe according to claim 1, characterized in that: The rear end of the oil pipe body (1) is detachably fitted with a rear end sleeve (12). The outer side of the rear end sleeve (12) is uniformly provided with guide blocks two (13) along the circumferential direction. The structure of the guide blocks two (13) is the same as that of the guide blocks one (9). The outer side of the rear end sleeve (12) is fitted with an elastic rubber ring (14), and the elastic rubber ring (14) is in contact with the end face of the adjusting ring (3).

5. An oil pipe according to claim 1, characterized in that: The front end sheath (10) has a series of interconnected sawtooth grooves (1001), arc grooves (1002) and positioning hook grooves (1003) on its inner front end wall. The sawtooth grooves (1001), arc grooves (1002) and positioning hook grooves (1003) are structurally identical to the sawtooth grooves (4), arc grooves (5) and positioning hook grooves (6).

6. An oil pipe according to claim 1, characterized in that: The inner sidewall of the end face of the front sleeve (10) is provided with an inner ring groove (1004), and the end of the outer ring groove (7) is provided with an outer ring groove (1005) that is adapted to the inner ring groove (1004). A sealing ring (1006) is sleeved on the outer side of the outer ring groove (1005), and the sealing ring (1006) is in contact with the end face of the front sleeve (10).

7. An oil pipe according to claim 2, characterized in that: The number of the anti-slip blocks (1102) corresponds one-to-one with the inclined guide grooves (1101). The outer surface of the anti-slip blocks (1102) is provided with anti-slip patterns (1104). The anti-slip patterns (1104) are unidirectional inclined teeth, and the inclination direction of the teeth is opposite to the initial insertion direction of the oil pipe body (1).

8. An oil pipe according to claim 1, characterized in that: The outer wall of the adjusting ring (3) is provided with an annular mounting groove, and a sealing ring (301) is installed in the annular mounting groove. The sealing ring (301) is tightly fitted to the outer peripheral wall of the oil pipe body (1).

9. A method for manufacturing an oil pipe, based on an oil pipe according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: The outer peripheral wall of the front end of the oil pipe body (1) is machined by CNC turning of the outer ring groove 1 (7), and the outer ring groove 2 (1005) is machined by CNC turning at the end of the outer ring groove 1 (7). Then, a disc spring (8) is installed on the outside of the outer ring groove 1 (7), and a guide block 1 (9) is uniformly machined along the circumference on the outside of the outer ring groove 1 (7) by milling. Step 2: The sawtooth groove (4), arc groove (5) and positioning hook groove (6) on the inner side of the adjusting ring (3) are machined by CNC turning. The sealing ring (301) is installed in the annular mounting groove of the adjusting ring (3). The adjusting ring (3) is sleeved on the outside of the limiting ring (2). Then, the limiting ring (2) is fixed to the inner side of the oil pipe body (1) away from the outer ring groove (7) by welding. Step 3: Process the front end sleeve (10). Process the inner ring groove (1004), the second serrated groove (1001), the second arc groove (1002) and the second positioning hook groove (1003) on the inner side wall of the front end sleeve (10). Install the second sealing ring (1006) in the second outer ring groove (1005). Process the inclined guide groove (1101) on the outer peripheral wall of the front end sleeve (10). Install the push spring (1103) and the anti-sliding block (1102) in the inclined guide groove (1101) to complete the assembly of the positioning mechanism (11). Step 4: Process the rear end sheath (12) and mill the guide block two (13) on its outer wall, and put the elastic rubber ring (14) on the rear end sheath (12). Then align the rear end sheath (12) with the rear end of the oil pipe body (1). The guide block two (13) slides in the sawtooth groove one (4), the arc groove one (5) and the positioning hook groove one (6). The elastic force of the elastic rubber ring (14) is used to lock the guide block two (13) inside the positioning hook groove one (6) to complete the overall preparation.

10. An application of an oil pipe in oil pipe repair, based on an oil pipe according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Use a pipe endoscope to inspect the entire damaged oil pipe to determine the specific location, length and inner wall roundness deviation of the damaged section. Then, mechanically scrape the inner wall of the oil pipe to remove scale, clean it with high-pressure water jet and remove rust with a wire brush. For locally deformed sections, use a mechanical shaper to perform radial correction to ensure that there are no obvious protrusions or burrs on the inner wall of the oil pipe. Step 2: Remove the front sleeve (10) and the rear sleeve (12), and smoothly push the single-section oil pipe body (1) into the oil pipe along the initial insertion direction. Then, from the opposite end of the insertion, insert the front sleeve (10) into the end of the oil pipe body (1). After installation, the push spring (1103) in the positioning mechanism (11) on the outside of the front sleeve (10) releases the pre-pressure and pushes the anti-slip block (1102) to extend along the inclined guide groove (1101). The one-way anti-slip texture (1104) on the outer surface of the anti-slip block (1102) fits tightly with the inner wall of the oil pipe to form a stop fit, preventing the oil pipe from continuing to slide along the initial insertion direction, thus completing the automatic positioning of the front end of the oil pipe without the need for additional limiting fixtures. Step 3: If the length of a single section of the oil pipe is insufficient to completely cover the damaged area, push the second section of the oil pipe into the other end of the oil pipe, so that the guide block 1 (9) on the outside of the outer ring groove 1 (7) at the front end of the second section of the oil pipe is aligned with the sawtooth groove 1 (4) on the inside of the adjusting ring (3) of the first section of the oil pipe. Continue to push the second section of the oil pipe at a constant speed. The guide block 1 (9) slides along the groove wall of the sawtooth groove 1 (4), driving the adjusting ring (3) to rotate along the stepped groove of the limiting ring (2) until the guide block 1 (9) slides into the arc groove 1 (5). Step 4: When the second section of the oil pipe is pushed to the preset splicing position, the disc spring (8) releases the pre-compression elastic force, pushes the adjusting ring (3) to move axially, and pushes the guide block (9) from the arc groove (5) to the positioning hook groove (6) to form an axial rigid limit, thus completing the in-situ splicing of the two sections of the oil pipe. If it is necessary to further extend the repair length, repeat steps 3-4 to achieve continuous splicing of multiple sections of the oil pipe. Step 5: Insert the rear end sheath (12) into the rear end of the tubing body (1), slide the guide block two (13) in the serrated groove one (4), the arc groove one (5) and the positioning hook groove one (6), and use the elastic force of the elastic rubber ring (14) to lock the guide block two (13) inside the positioning hook groove one (6). Step 6: Using a portable mechanical tube expander, the spliced ​​tube is expanded progressively from one end to the other, so that the outer peripheral walls of the tube body (1), the front end sheath (10) and the rear end sheath (12) are tightly press-fitted with the inner wall of the tube. At the same time, the sealing ring one (301), the sealing ring two (1006) and the elastic rubber ring (14) form multiple seals to block the leakage path of the medium.

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