A tubing string coating device

Abstract

The utility model discloses a kind of oil pipe column gluing devices, including glue storage cylinder, piston rod, spiral guide rod and guide sleeve, nozzle is provided at the lower end of glue storage cylinder;The upper end of piston rod is connected with the lower end of spiral guide rod, the lower end of guide sleeve is connected with the upper end of glue storage cylinder and can be movably sleeved on the outside of spiral guide rod along spiral, glue storage cylinder movably is sleeved on the outside of piston rod;Middle piston and lower piston are also provided in glue storage cylinder, and annular glue storage cavity is formed.When guide sleeve moves along spiral on the outside of spiral guide rod, simultaneously drive glue storage cylinder also relatively displace with piston rod, cause the volume of glue storage cavity gradually decrease, to compress glue solution, make glue solution in glue storage cylinder from nozzle spray, and even spray in the leakage of oil pipe column.

Description

Technical Field

[0001] This utility model relates to the field of tubing repair tools, specifically to a tubing string adhesive application device. Background Technology

[0002] In oil and gas field development, tubing strings may experience wear, cracks, or formation fluid leakage due to factors such as corrosion, mechanical stress, and material fatigue. Therefore, tubing string plugging technology is one of the key technologies to ensure wellbore integrity in oil and gas field development.

[0003] Currently, methods for sealing leaks in oil tubing include mechanical, chemical, and smart material approaches. For example, cement grouting or the use of gel-based materials like epoxy resin can be employed. Cement grouting involves injecting cement slurry into the tubing to form a sealing layer, preventing leakage of oil or water. However, this method requires precise control of the cement slurry's mix ratio, injection pressure, and curing time, and it cannot be applied in sections. Therefore, it struggles to effectively seal micro-cracks or may block oil and gas flow channels. Furthermore, the poor water absorption of cement slurry can limit the amount injected, resulting in poor sealing. When using gel-based materials like epoxy resin for repair, a caulking gun is typically used to inject the epoxy resin into the crack, or brushes and scrapers are used to apply it to the crack surface. However, neither method can guarantee even application.

[0004] Therefore, it can be seen that the current tubing string plugging technology has the disadvantage of blocking the oil and gas flow channels, as well as the problem of uneven application of adhesive. Utility Model Content

[0005] Therefore, this utility model provides an oil tubing string adhesive application device to solve the problems mentioned in the background art regarding uneven adhesive application at the leaks in the tubing string and the tendency to block oil and gas flow pipelines.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A tubing string adhesive application device includes an adhesive reservoir, a piston rod, a spiral guide rod, and a guide sleeve. The upper end of the piston rod is connected to the lower end of the spiral guide rod, and the lower end of the guide sleeve is connected to the upper end of the adhesive reservoir and is movably sleeved on the spiral guide rod. The adhesive reservoir is movably sleeved on the piston rod, and an annular space is provided between the piston rod and the adhesive reservoir. A lower piston protruding inward is provided on the bottom inner wall of the adhesive reservoir, and the lower piston is sealed to the outer wall of the piston rod. A middle piston protruding outward is provided on the piston rod at a position corresponding to the upper end of the adhesive reservoir, and the middle piston is sealed to the inner wall of the adhesive reservoir. The annular space between the middle piston and the lower piston forms an adhesive storage cavity. A nozzle communicating with the adhesive storage cavity is provided at the lower end of the adhesive reservoir.

[0008] The outer wall of the spiral guide rod is provided with a spiral guide groove, and a roller is provided on the guide sleeve. The inner end of the roller extends into the spiral guide groove, and the inner end of the roller is adapted to the groove width of the spiral guide groove.

[0009] The guide sleeve is provided with a shear pin, and the spiral guide rod is provided with a positioning hole corresponding to the position of the shear pin, with the inner end of the shear pin embedded in the positioning hole.

[0010] An intermediate connecting pipe is provided between the glue storage cylinder and the guide sleeve. The intermediate connecting pipe is movably sleeved outside the piston rod. The lower end of the intermediate connecting pipe is sealed to the upper end of the glue storage cylinder. The lower section of the intermediate connecting pipe is provided with an upper piston that protrudes radially inward. The upper piston is sealed to the outer wall of the piston rod. An air inlet is provided on the piston rod, and the air inlet is located between the upper piston and the intermediate piston.

[0011] Among them, a straightening sleeve is movably sleeved on the outer periphery of the glue storage cylinder and the guide sleeve, and multiple spring support plates are provided on the outer periphery of the straightening sleeve.

[0012] The glue storage cylinder has multiple fixing holes arranged circumferentially at its end, and an internal hexagonal plug is installed in the fixing hole. The nozzle is threadedly connected to the internal hexagonal plug. The nozzle is a fan-shaped nozzle.

[0013] An oil pipe coupling is provided at the upper end of the spiral guide rod.

[0014] The middle piston has a first sealing ring and a first nitrile sealing ring on its outer circumferential side, and a second sealing ring and a second nitrile sealing ring on its inner circumferential side.

[0015] A third nitrile sealing ring is provided at the connection between the lower end of the intermediate connecting pipe and the upper end of the rubber storage cylinder, and a sealing ring and a sealing retainer ring are provided on the outer periphery of the upper piston.

[0016] Among them, an elastic scraper ring for a hole is provided on the inner circumference side of the lower piston, and the elastic scraper ring for a hole is spaced apart on the upper side of the second sealing ring retainer; an elastic scraper ring for a shaft is provided on the outer circumference side of the middle piston, and the elastic scraper ring for a shaft is spaced apart on the lower side of the first sealing ring retainer.

[0017] This utility model has the following advantages: The utility model provides an adhesive coating device for an oil tubing column, comprising an adhesive reservoir, a piston rod, a spiral guide rod, and a guide sleeve. A nozzle is provided at the lower end of the adhesive reservoir. The upper end of the piston rod is connected to the lower end of the spiral guide rod, and the lower end of the guide sleeve is connected to the upper end of the adhesive reservoir and is spirally mounted on the spiral guide rod. The adhesive reservoir is movably mounted on the piston rod. A lower piston is provided on the inner wall of the bottom of the adhesive reservoir, sealingly engaging with the outer wall of the piston rod. A middle piston is provided on the outer periphery of the piston rod, corresponding to the upper end of the adhesive reservoir, sealingly engaging with the inner wall of the adhesive reservoir, thus forming an annular adhesive reservoir cavity between the lower and middle pistons. When the guide sleeve spirally moves around the outer periphery of the spiral guide rod, the adhesive reservoir also undergoes relative displacement with the piston rod, causing the volume of the adhesive reservoir cavity to gradually decrease. This allows the adhesive in the adhesive reservoir to be sprayed out from the nozzle and evenly coated at the leaks, without clogging the oil and gas flow channels.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

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

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1 A schematic diagram of a tubing string adhesive coating device provided in an embodiment of this utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of part AA;

[0023] Figure 3 for Figure 1 Enlarged schematic diagram of part A1 in the diagram;

[0024] Figure 4 for Figure 1 An enlarged schematic diagram of part A2 in the diagram.

[0025] In the diagram: 1. Oil pipe coupling; 2. Spiral guide rod; 3. Hex socket head cap set screw; 4. Guide sleeve; 5. Shear pin; 6. Roller; 7. Straightening sleeve; 8. Intermediate connecting pipe; 9. First sealing ring retainer; 10. First nitrile sealing ring; 11. Hole elastic scraper ring; 12. Third nitrile sealing ring; 13. Spring support plate; 14. Glue reservoir; 15. Shaft elastic scraper ring; 16. Second sealing ring retainer; 17. Second nitrile sealing ring; 18. Nozzle; 19. Hex socket head cap screw plug; 20. Piston rod; 21. Air inlet; 22. Glue reservoir. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-4 As shown, this embodiment provides an adhesive coating device for tubing strings, including an adhesive reservoir 14, a piston rod 20, a spiral guide rod 2, and a guide sleeve 4. The upper end of the piston rod 20 is connected to the lower end of the spiral guide rod 2. The outer wall of the spiral guide rod 2 is provided with a spiral guide groove, and a roller 6 is provided on the guide sleeve 4. The inner end of the roller 6 is adapted to the groove width of the spiral guide groove. By sleeved on the spiral guide rod 2 and extending the inner end of the roller 6 into the spiral guide groove, the guide sleeve 4 can move spirally along the outer circumference of the spiral guide rod 2.

[0028] It also includes an intermediate pipe 8. The lower end of the guide sleeve 4 is connected to the upper end of the glue storage cylinder 14 through the intermediate pipe 8. The intermediate pipe 8 and the glue storage cylinder 14 are together sleeved on the outside of the piston rod 20. When the guide sleeve 4 moves spirally along the guide groove on the outer periphery of the spiral guide rod 2, it will drive the intermediate pipe 8 and the glue storage cylinder 14 to rotate and move relative to the piston rod 20.

[0029] An annular space is provided between the piston rod 20 and the glue storage cylinder 14; a lower piston is provided on the bottom inner wall of the glue storage cylinder 14, the lower piston protrudes inward and seals with the outer wall of the piston rod 20; a middle piston is provided at the upper end of the glue storage cylinder 14 corresponding to the piston rod 20, the middle piston protrudes outward and seals with the inner wall of the glue storage cylinder 14; thus, the annular space between the middle piston and the lower piston forms the glue storage cavity 22.

[0030] A second sealing ring 16 and a second nitrile sealing ring 17 are provided on the inner circumference of the lower piston. The second nitrile sealing ring 17 also provides a reliable sealing effect between the lower piston and the piston rod 20, preventing the glue in the glue storage chamber 22 from leaking out during the upward movement of the glue storage cylinder 14. The second sealing ring 16 can effectively support the second nitrile sealing ring 17 and prevent the sealing ring from being damaged. The second sealing ring 16 and the second nitrile sealing ring 17 improve the reliability and durability of the sealing system.

[0031] A first sealing ring 9 and a first nitrile sealing ring 10 are provided on the outer periphery of the middle piston. The first nitrile sealing ring 10 can prevent the glue in the glue storage cavity 22 from leaking and provide a reliable sealing effect between the middle piston and the glue storage cylinder 14. The first sealing ring 9 can prevent the first nitrile sealing ring 10 from being twisted or damaged, thereby extending the service life of the sealing ring.

[0032] Multiple fixing holes are provided circumferentially at the lower end of the glue storage cylinder 14. A nozzle 18 is provided in the fixing hole. The nozzle 18 is connected to the glue storage cavity 22 and is used to spray out the glue liquid in the glue storage cylinder. The nozzle 18 is a fan-shaped nozzle, which is conducive to the uniform spraying of the glue liquid.

[0033] An internal hexagonal plug 19 is also installed in the fixing hole. The internal hexagonal plug 19 is connected to the nozzle 18 through a threaded structure. The internal hexagonal plug 19 can effectively prevent glue leakage and ensure the sealing between the glue storage cylinder 14 and the nozzle 18.

[0034] Before the device is lowered into the well, the glue storage cylinder 14 is filled with glue, and the filling port is located on the mounting end face of the nozzle 18. After the glue is filled, it moves upward along the spiral guide groove outside the spiral guide rod 2 through the guide sleeve 4. Driven by the guide sleeve 4, the intermediate pipe 8 and the glue storage cylinder 14 also spirally rise relative to the piston rod 20, which causes the volume of the glue storage chamber 22 to gradually decrease. Subsequently, the glue in the glue storage chamber 22 is sprayed out from the nozzle 18. Since the nozzle 18 rotates during the upward process, the sprayed glue achieves a more uniform effect, avoiding blockage of the oil and gas flow pipeline.

[0035] An elastic scraper ring 15 for holes is provided on the inner circumference side of the lower piston. The elastic scraper ring 15 for holes is spaced apart on the upper side of the second sealing ring retainer ring 16. The purpose is to prevent the adhesive from sticking to the outer wall of the piston rod 20, so as not to waste the adhesive and to keep the device clean.

[0036] A shaft elastic scraper ring 11 is also provided on the outer periphery of the piston. The shaft elastic scraper ring 11 is spaced apart on the lower side of the first sealing ring 9. The purpose is to prevent the adhesive from sticking to the inner wall of the adhesive storage cylinder 14, reduce adhesive waste, and further ensure the spraying effect.

[0037] To ensure the adhesive application device operates under a specific pressure differential, shear pins 5 are installed on the guide sleeve 4. Correspondingly, positioning holes are provided on the spiral guide rod 2 at the positions corresponding to the shear pins 5. The inner ends of the shear pins 5 are embedded in the positioning holes to restrict the spiral movement of the guide sleeve 4. Simultaneously, an upper piston is provided on the lower section of the intermediate pipe 8. The upper piston protrudes radially inward and can seal against the outer wall of the piston rod 20. An air inlet 21 is provided on the piston rod 20, located between the upper piston and the intermediate piston. When high-pressure gas is injected from the upper end of the spiral guide rod 2 and the pressure exceeds a predetermined value (e.g., 5 MPa above the external pressure), the upper piston generates an upward thrust that cuts the shear pins 5. Subsequently, the guide sleeve 4 drives the intermediate pipe 8 and the adhesive storage cylinder 14 to spiral upward. During the relative displacement of the adhesive storage cylinder 14 and the piston rod 20, the volume of the adhesive storage chamber 22 decreases, promoting the uniform spraying of the adhesive.

[0038] A third nitrile sealing ring 12 is provided at the connection between the lower end of the intermediate pipe 8 and the upper end of the glue storage cylinder 14. A sealing ring and a sealing retainer are also provided on the outer periphery of the upper piston. The purpose is to ensure the sealing between the upper piston and the piston rod 20, as well as the sealing connection between the intermediate pipe 8 and the glue storage cylinder 14, so as to ensure that the upper piston can move upward under the action of high pressure gas.

[0039] During the operation of this adhesive coating device, in order to ensure that the nozzle 18 remains centered inside the tube, a centering sleeve 7 is movably fitted on the outer periphery of the adhesive storage cylinder 14 and the guide sleeve 4, respectively. Multiple spring support plates 13 are provided on the outer periphery of the centering sleeve 7. Steps are provided on the outer walls of the adhesive storage cylinder 14 and the guide sleeve 4. The lower end of the centering sleeve 7 abuts against the step. When the adhesive coating device is eccentric, the spring support plates 13 will be squeezed. The spring force generated after being squeezed forces the tool to center, further ensuring the uniformity of the spraying.

[0040] The straightening sleeve 7 is loosely fitted outside the guide sleeve 4 of the glue storage cylinder 14. When the glue storage cylinder 14 and the guide sleeve 4 rotate and rise, the straightening sleeve 7 only rises in a straight line and does not rotate, thus avoiding the spring support plate 13 from scraping the inner wall of the oil pipe.

[0041] An oil pipe coupling 1 is provided at the upper end of the spiral guide rod 2 for connecting adjacent oil pipes.

[0042] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A tubing string adhesive coating device, characterized in that, The device includes a glue storage cylinder (14), a piston rod (20), a spiral guide rod (2), and a guide sleeve (4). The upper end of the piston rod (20) is connected to the lower end of the spiral guide rod (2), and the lower end of the guide sleeve (4) is connected to the upper end of the glue storage cylinder (14) and is spirally movable and sleeved outside the spiral guide rod (2). The glue storage cylinder (14) is movably sleeved outside the piston rod (20), and an annular space is provided between the piston rod (20) and the glue storage cylinder (14). The bottom of the glue storage cylinder (14) A lower piston protruding inward is provided on the inner wall of the part, and the lower piston is sealed to the outer wall of the piston rod (20). A middle piston protruding outward is provided on the piston rod (20) at the position corresponding to the upper end of the glue storage cylinder (14), and the middle piston is sealed to the inner wall of the glue storage cylinder (14). The annular space between the middle piston and the lower piston forms a glue storage cavity (22). A nozzle (18) communicating with the glue storage cavity (22) is provided at the lower end of the glue storage cylinder (14).

2. The tubing string adhesive application device according to claim 1, characterized in that, The outer wall of the spiral guide rod (2) is provided with a spiral guide groove, and a roller (6) is provided on the guide sleeve (4). The inner end of the roller (6) extends into the spiral guide groove, and the inner end of the roller (6) is adapted to the groove width of the spiral guide groove.

3. The tubing string adhesive application device according to claim 2, characterized in that, A shear pin (5) is provided on the guide sleeve (4), and a positioning hole is provided on the spiral guide rod (2) corresponding to the position of the shear pin (5), and the inner end of the shear pin (5) is embedded in the positioning hole.

4. The tubing string adhesive application device according to claim 1, characterized in that, An intermediate connecting pipe (8) is provided between the glue storage cylinder (14) and the guide sleeve (4). The intermediate connecting pipe (8) is movably sleeved outside the piston rod (20). The lower end of the intermediate connecting pipe (8) is sealed to the upper end of the glue storage cylinder (14). The lower section of the intermediate connecting pipe (8) is provided with an upper piston that protrudes radially inward. The upper piston is sealed to the outer wall of the piston rod (20). An air inlet (21) is provided on the piston rod (20). The air inlet (21) is located between the upper piston and the intermediate piston.

5. The tubing string adhesive application device according to claim 1, characterized in that, A straightening sleeve (7) is movably fitted around the outer periphery of the glue storage cylinder (14) and the guide sleeve (4), and a plurality of spring support plates (13) are provided around the outer periphery of the straightening sleeve (7).

6. The tubing string adhesive application device according to claim 1, characterized in that, Multiple fixing holes are provided circumferentially at the end of the glue storage cylinder (14), and an internal hexagonal screw plug (19) is installed in the fixing hole. The nozzle (18) is threadedly connected to the internal hexagonal screw plug (19). The nozzle (18) is a fan-shaped nozzle.

7. The tubing string adhesive application device according to claim 1, characterized in that, An oil pipe coupling (1) is provided at the upper end of the spiral guide rod (2).

8. The tubing string adhesive application device according to claim 1, characterized in that, A first sealing ring (9) and a first nitrile sealing ring (10) are provided on the outer circumferential side of the middle piston, and a second sealing ring (16) and a second nitrile sealing ring (17) are provided on the inner circumferential side of the lower piston.

9. The tubing string adhesive application device according to claim 4, characterized in that, A third nitrile sealing ring (12) is provided at the connection between the lower end of the intermediate pipe (8) and the upper end of the glue storage cylinder (14), and a sealing ring and a sealing retainer are provided on the outer periphery of the upper piston.

10. The tubing string adhesive application device according to claim 8, characterized in that, An elastic scraper ring (15) for a hole is also provided on the inner circumferential side of the lower piston, and the elastic scraper ring (15) for a hole is spaced apart on the upper side of the second sealing ring retainer (16); an elastic scraper ring (11) for a shaft is also provided on the outer circumferential side of the middle piston, and the elastic scraper ring (11) for a shaft is spaced apart on the lower side of the first sealing ring retainer (9).

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