Oil field horizontal well layered acidification composite process pipe column

Abstract

The utility model relates to the technical field of oil field horizontal well operation tools, in particular to an oil field horizontal well layered acidification composite process pipe column which comprises a conveying outer pipe, and the conveying outer pipe is movably connected with a conveying inner pipe in a sleeved mode. The acid solution adsorbed on the outer side of the conveying inner pipe is synchronously cleaned in multiple cleaning modes such as physical cleaning and chemical cleaning, the acid solution adsorbed on the outer side of the conveying inner pipe is completely cleaned, the contact time of the acid solution and the conveying inner pipe is effectively controlled, corrosion of the acid solution to the conveying inner pipe is effectively restrained, the influence of the corrosion is remarkably weakened, and the service life of the conveying inner pipe is prolonged. The surface of the conveying inner pipe is kept intact for a long time, so that even if the inner pipe is in contact with corrosive substances, the integrity and the functionality of the conveying inner pipe can be kept as long as the inner pipe is timely and properly protected, and the conveying inner pipe can continuously and normally play a proper role.

Description

Technical Field

[0001] This utility model relates to the technical field of oilfield horizontal well operation tools, and in particular to a tubing string for a layered acidizing composite process in oilfield horizontal wells. Background Technology

[0002] The oilfield horizontal well stratified acidizing composite process tubing string is a technical device specifically designed for acidizing operations in oilfield horizontal wells. Through a specific structure and process, it achieves stratified acidizing of different sections of the horizontal well to improve the production capacity and extraction efficiency of the oil well.

[0003] In the process of oil extraction, for different sections of complex well types such as horizontal wells in oil fields, it is often necessary to carry out layered acidizing treatment to improve extraction efficiency. In this process, composite process tubing plays a crucial role. However, when composite process tubing is put into use, the outer side of its inner tube will inevitably come into contact with acidic solution.

[0004] If the outer side of the inner tube is not cleaned in a timely and effective manner after contact with an acidic solution, the acidic solution will gradually corrode the outer side of the inner tube. Over time, this corrosion will become more and more serious. If it is not stopped, the surface of the inner tube will rust or even break in a short period of time. Once the inner tube is severely corroded, its structural integrity and functional performance will be greatly reduced, and it will be unable to perform its due function. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing the following technical solution: a composite process tubing for layered acidizing in oilfield horizontal wells, comprising an outer delivery pipe, an inner delivery pipe movably sleeved on the outer delivery pipe, a support mechanism slidably disposed on the inner wall of the outer delivery pipe to maintain stable sliding of the inner delivery pipe, a circular reservoir chamber formed inside the inner wall of the outer delivery pipe, a circular main block fixedly installed near the left end of the inner wall of the outer delivery pipe, the middle of the circular main block being at the same horizontal plane as the middle of the circular reservoir chamber, a delivery channel formed in the middle of the inner wall of the circular reservoir chamber near the center, the end of the delivery channel near the center penetrating the end of the circular main block near the center, assisting circular chambers formed on both sides of the delivery channel and inside the circular main block, a T-shaped circular valve movably engaged with the delivery channel, and a triangular circular valve fixedly installed near the center end of the T-shaped circular valve. The arc block, on both sides of the T-shaped circular valve, near the top, is fixedly equipped with a malleable circular ring plate. The malleable circular ring plate is movably engaged with the assisting circular ring chamber. A circular ring spring is fixedly installed on the side of the malleable circular ring plate away from the center. The end of the circular ring spring away from the center is fixedly installed on the inner wall of the assisting circular ring chamber away from the center. A circular ring scraper assembly is fixedly installed on the end of the main circular block near the center and on the right side of the infusion channel. Multiple power blocks are fixedly installed on the outside of the inner delivery tube. When the inner delivery tube moves to the right, through the cooperation of the support mechanism and the triangular arc block and other structures, the acidic solution adsorbed on the outside of the inner delivery tube is cleaned simultaneously by physical and chemical methods, completely removing the acidic solution adsorbed on the outside of the inner delivery tube. The contact time between the acidic solution and the inner delivery tube is effectively controlled, and the corrosion of the inner delivery tube by the acidic solution is effectively inhibited.

[0006] As an improvement to the above technical solution, the support mechanism includes a horizontal slot, which is formed on the inner wall of the outer conveying tube. The main annular block is located on the left side of the horizontal slot. A movable locking block is movably engaged with the horizontal slot. A supporting annular pad is fixedly installed on the outer side of the inner conveying tube close to its right end. The outer side of the supporting annular pad is fixedly installed on the side of the movable locking block near its center. An auxiliary annular pad is fixedly installed on the inner wall of the outer conveying tube close to its left end. A circular assist block is fixedly installed on the inner wall of the inner conveying tube close to its left end. A circular detector is fixedly installed on the inner wall of the outer conveying tube on the left side of the horizontal slot. The sliding inner conveying tube is supported by the cooperation of the internal structure of the support mechanism, and the acidic solution adsorbed on the outer side of the inner conveying tube is physically scraped off.

[0007] As an improvement to the above technical solution, the end of the main annular block near the center and located at the left end of the infusion channel is attached to the outside of the inner tube, so that a relatively closed annular chamber is formed between the left side of the annular scraper assembly and the left side of the main annular block.

[0008] As an improvement to the above technical solution, the circular scraper assembly consists of three circular scrapers arranged linearly and evenly on the right side of the main circular block near the center. The diameter of the left circular scraper is larger than that of the right circular scraper, so that the circular scraper assembly has a gradual scraping effect on the inner tube of the conveyor.

[0009] As an improvement to the above technical solution, the plastic ring plate has multiple connecting holes on the side away from the center, so that the alkaline solution in the infusion channel can flow through the connecting holes to the side of the assisting ring chamber closer to the center.

[0010] As an improvement to the above technical solution, an arc groove is provided on the left side of the auxiliary annular pad close to the center, and the right end of the arc groove passes through the main annular block and the annular scraper assembly to prevent the auxiliary annular pad, the main annular block and the annular scraper assembly from blocking the power block during its movement.

[0011] The beneficial effects of this utility model are as follows: When the inner conveying tube moves to the right, the acidic solution adsorbed on the outside of the inner conveying tube is simultaneously cleaned by a combination of physical and chemical methods through the cooperation of the support mechanism and the triangular arc block, completely removing the acidic solution adsorbed on the outside of the inner conveying tube. The contact time between the acidic solution and the inner conveying tube is effectively controlled, and the corrosion of the inner conveying tube by the acidic solution is effectively curbed, and its impact is significantly reduced. The surface of the inner conveying tube will remain intact for a longer period of time. Therefore, even if the inner tube comes into contact with corrosive substances, as long as it receives timely and appropriate protection, the integrity and functionality of the inner conveying tube can be maintained, thus enabling it to continuously and normally perform its due function. Attached Figure Description

[0012] Figure 1 This is a front view of the composite process tubular column of this utility model;

[0013] Figure 2 This is a cross-sectional view of the internal structure of the present invention.

[0014] Figure 3 This utility model Figure 2 Enlarged view of the structure at point A in the middle;

[0015] Figure 4 This utility model Figure 2 Enlarged view of the structure at point B in the middle;

[0016] Figure 5 This utility model Figure 4 Enlarged view of the structure at point C;

[0017] Figure 6 This utility model Figure 4 Enlarged view of the structure at point D.

[0018] Reference numerals: 1. Outer delivery pipe; 2. Inner delivery pipe; 21. Horizontal slot; 22. Moving block; 23. Supporting ring pad; 24. Auxiliary ring pad; 25. Ring detector; 3. Ring storage tank; 31. Main ring block; 32. Infusion channel; 33. Assisting ring tank; 34. T-shaped ring valve; 35. Triangular arc block; 36. Plastic ring clamping plate; 37. Ring spring; 38. Ring scraper assembly; 39. Power block. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following provides a more detailed description of the utility model. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the utility model.

[0020] Reference Appendix Figure 1 ,exist Figure 1 In the diagram, 'a' points to the front view and 'b' points to the right-side view. These views are only used to understand the scheme.

[0021] Please see Figure 1-6 This utility model provides a technical solution: a composite process tubing string for layered acidizing in oilfield horizontal wells, including an outer delivery pipe 1, an inner delivery pipe 2 movably sleeved on the outer delivery pipe 1, a support mechanism slidably disposed on the inner wall of the outer delivery pipe 1 to maintain stable sliding of the inner delivery pipe 2, a circular reservoir 3 formed inside the inner wall of the outer delivery pipe 1, a circular main block 31 fixedly installed near the left end of the inner wall of the outer delivery pipe 1, the middle of the circular main block 31 being at the same horizontal plane as the middle of the circular reservoir 3, a delivery channel 32 formed in the middle of the inner wall of the circular reservoir 3 near the center, the end of the delivery channel 32 near the center penetrating the end of the circular main block 31 near the center, and assisting circular chambers 33 formed on both sides of the delivery channel 32 and inside the circular main block 31. The liquid channel 32 is movably engaged with a T-shaped circular valve 34. The T-shaped circular valve 34 is made of a malleable material. A triangular arc block 35 is fixedly installed at one end of the T-shaped circular valve 34 near the center. Malleable circular plates 36 are fixedly installed on both sides of the T-shaped circular valve 34 near the top. The malleable circular plates 36 are movably engaged with the assisting circular chamber 33. A circular spring 37 is fixedly installed on the side of the malleable circular plate 36 away from the center. The end of the circular spring 37 away from the center is fixedly installed on the inner wall of the assisting circular chamber 33 away from the center. A circular scraper assembly 38 is fixedly installed at the end of the circular main block 31 near the center and on the right side of the infusion channel 32. Multiple power blocks 39 are fixedly installed on the outside of the inner delivery tube 2.

[0022] In this embodiment, when the inner conveying tube 2 moves to the right, the acidic solution adsorbed on the outside of the inner conveying tube 2 is simultaneously cleaned by a combination of physical and chemical methods through the cooperation of the support mechanism and the triangular arc block 35 and other structures. This completely removes the acidic solution adsorbed on the outside of the inner conveying tube 2, effectively controlling the contact time between the acidic solution and the inner conveying tube 2, and effectively inhibiting the corrosion of the inner conveying tube 2 by the acidic solution.

[0023] Specifically, the support mechanism includes a horizontal slot 21, which is formed on the inner wall of the outer conveying tube 1. The main annular block 31 is located on the left side of the horizontal slot 21. The horizontal slot 21 is movably engaged with a movable block 22. A supporting annular pad 23 is fixedly installed on the outer side of the inner conveying tube 2, close to the right end. The outer side of the supporting annular pad 23 is fixedly installed on the side of the movable block 22 near the center. An auxiliary annular pad 24 is fixedly installed on the inner wall of the outer conveying tube 1, close to the left end. An annular assist block is fixedly installed on the inner wall of the inner conveying tube 2, close to the left end. A annular detector 25 is fixedly installed on the inner wall of the outer conveying tube 1, located on the left side of the horizontal slot 21.

[0024] In this embodiment, the sliding inner conveying tube 2 is supported by the cooperation of the internal structure of the support mechanism, while the acidic solution adsorbed on the outside of the inner conveying tube 2 is physically scraped off.

[0025] Specifically, the end of the main annular block 31 near the center and located at the left end of the infusion channel 32 is attached to the outside of the inner delivery tube 2.

[0026] In this embodiment, a relatively closed annular compartment is formed between the left side of the annular scraper assembly 38 and the left side of the annular main block 31.

[0027] Specifically, the circular scraper assembly 38 consists of three circular scrapers, which are arranged linearly and evenly on the right side of the circular main block 31 near the center. The diameter of the left circular scraper is larger than that of the right circular scraper.

[0028] In this embodiment, the annular scraper assembly 38 has a gradual scraping effect on the inner conveying tube 2.

[0029] Specifically, the malleable circular plate 36 has multiple connecting circular holes on the side away from the center.

[0030] In this embodiment, the alkaline solution in the infusion channel 32 can flow through the connecting circular hole to the side of the assisting annular chamber 33 near the center.

[0031] Specifically, an arc groove is provided on the left side of the auxiliary ring pad 24, close to the center, and the right end of the arc groove passes through the main ring block 31 and the ring scraper assembly 38.

[0032] In this embodiment, the power block 39 is prevented from being blocked by the auxiliary annular pad 24, the main annular block 31, and the annular scraper assembly 38 during its movement.

[0033] During use, the outer side of the inner conveying tube 2 will inevitably come into contact with acidic solutions. After the inner conveying tube 2 completes its operation, an external power source engages the annular assist block inside the inner conveying tube 2, pushing the inner conveying tube 2 to the right. At this time, the inner conveying tube 2 drives the supporting annular pad 23 to move to the right, and the supporting annular pad 23 drives the moving block 22 to move to the right along the horizontal slot 21. During the movement of the inner conveying tube 2, the auxiliary annular pad 24 supports the inner conveying tube 2 and cooperates with the moving block 22 and other structures to maintain the stability of the inner conveying tube 2 during movement. The inner conveying tube 2 drives the power block 39 to move to the right. When the power block 39 moves to the right, it passes through the auxiliary annular pad 24 and the left side of the main annular block 31 and then contacts the triangular arc block 35. After the force block 39 moves to the right, it pushes the triangular arc block 35 to move away from the center. The triangular arc block 35 pushes the cross-section T-shaped annular valve 34 to move away from the center. The cross-section T-shaped annular valve 34 pushes the malleable annular clamping plate 36 to move away from the center, causing the compression ring spring 37 to deform. At this time, the cross-section T-shaped annular valve 34 is released from the clamping of the infusion channel 32. The alkaline solution in the annular storage tank 3 flows into the annular spring 37 through the infusion channel 32, and then flows out of the infusion channel 32 through the connecting circular hole to contact the outside of the inner delivery tube 2. Since a relatively closed annular chamber is formed between the left side of the annular scraper assembly 38 and the left side of the annular main block 31, the alkaline solution discharged from the infusion channel 32 accumulates here. At this point, after the power block 39 moves to the right and releases the push on the triangular arc block 35, the circular spring 37 generates thrust, causing the malleable circular clamping plate 36 to move closer to the center. The malleable circular clamping plate 36 drives the cross-section T-shaped circular valve 34 to move closer to the center to block the infusion channel 32. As the inner delivery tube 2 moves to the right, the auxiliary circular pad 24 scrapes away most of the acidic solution adhering to the outside of the inner delivery tube 2. When the inner delivery tube 2 carries the remaining acidic solution into the circular chamber, the remaining acidic solution is removed through an acid-base neutralization reaction between the acidic solution and the alkaline solution. At the same time, the inner delivery tube 2 continues to move to the right, and the circular scraper assembly 38 gradually scrapes away the liquid on the outside of the inner delivery tube 2 to prevent... The inner conveying tube 2 carries out a large amount of unreacted liquid at once. The acid-base neutralization reaction between the acidic and alkaline solutions generates a large amount of heat, causing the relative temperature at the connection between the outer conveying tube 1 and the inner conveying tube 2 to be too high, thus providing a heat preservation effect for the liquid inside the inner conveying tube 2. During the movement of the inner conveying tube 2, the circular detector 25 detects the outer side of the inner conveying tube 2. If severe corrosion is detected on the outer side of the inner conveying tube 2, it facilitates timely replacement by construction personnel. Through the cooperation of the support mechanism and the triangular arc block 35 and other structures, the acidic solution adsorbed on the outer side of the inner conveying tube 2 is cleaned simultaneously using multiple physical and chemical cleaning methods, thereby completely removing the acidic solution adsorbed on the outer side of the inner conveying tube 2.The contact time between the acidic solution and the inner conveying tube 2 is effectively controlled, thus effectively suppressing the impact of the acidic solution on the inner conveying tube 2 and significantly reducing its influence. The surface of the inner conveying tube 2 will remain intact for a longer period of time. Even if the inner tube comes into contact with corrosive substances, as long as it receives timely and appropriate protection, its structural integrity and functional performance will be maintained, allowing it to continuously and normally perform its intended function.

[0034] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A composite tubing string for layered acidizing in oilfield horizontal wells, comprising an outer delivery tubing (1), characterized in that: The outer delivery tube (1) is movably sleeved with the inner delivery tube (2). The inner wall of the outer delivery tube (1) is slidably provided with a support mechanism to keep the inner delivery tube (2) sliding stably. A circular liquid storage chamber (3) is opened inside the inner wall of the outer delivery tube (1). A circular main block (31) is fixedly installed on the inner wall of the outer delivery tube (1) near the left end. The middle of the circular main block (31) and the middle of the circular liquid storage chamber (3) are at the same horizontal plane. A delivery channel (32) is opened in the middle of the inner wall of the circular liquid storage chamber (3) near the center. The end of the delivery channel (32) near the center passes through the end of the circular main block (31) near the center. Assist circular chambers (33) are opened on both sides of the delivery channel (32) and inside the circular main block (31). The delivery channel (32) is movable. A T-shaped circular valve (34) with a snap-fit ​​is provided. A triangular arc block (35) is fixedly installed at one end of the T-shaped circular valve (34) near the center. A plastic circular clamping plate (36) is fixedly installed on both the left and right sides of the T-shaped circular valve (34) close to the top. The plastic circular clamping plate (36) is movably snap-fitted with the assist circular chamber (33). A circular spring piece (37) is fixedly installed on the side of the plastic circular clamping plate (36) away from the center. The end of the circular spring piece (37) away from the center is fixedly installed on the inner wall of the assist circular chamber (33) away from the center. A circular scraper assembly (38) is fixedly installed at the end of the circular main block (31) near the center and on the right side of the infusion channel (32). Multiple power blocks (39) are fixedly installed on the outside of the delivery inner tube (2).

2. The oilfield horizontal well stratified acidizing composite process tubing string according to claim 1, characterized in that: The support mechanism includes a horizontal slot (21) which is opened on the inner wall of the outer conveying tube (1). The main annular block (31) is located on the left side of the horizontal slot (21). The horizontal slot (21) is movably engaged with a movable block (22). A supporting annular pad (23) is fixedly installed on the outer side of the inner conveying tube (2) close to the right end. The outer side of the supporting annular pad (23) is fixedly installed on the side of the movable block (22) close to the center. An auxiliary annular pad (24) is fixedly installed on the inner wall of the outer conveying tube (1) close to the left end. An annular assist block is fixedly installed on the inner wall of the inner conveying tube (2) close to the left end. An annular detector (25) is fixedly installed on the inner wall of the outer conveying tube (1) on the left side of the horizontal slot (21).

3. The oilfield horizontal well stratified acidizing composite process tubing string according to claim 1, characterized in that: The main ring block (31) is located at one end near the center and at the left end of the infusion channel (32), which is attached to the outside of the inner tube (2).

4. The oilfield horizontal well stratified acidizing composite process tubing string according to claim 1, characterized in that: The circular scraper assembly (38) consists of three circular scrapers arranged linearly and evenly on the right side of the circular main block (31) near the center. The diameter of the left circular scraper is larger than that of the right circular scraper.

5. The oilfield horizontal well stratified acidizing composite process tubing string according to claim 1, characterized in that: The malleable circular plate (36) has multiple connecting circular holes on the side away from the center.

6. The oilfield horizontal well stratified acidizing composite process tubing string according to claim 2, characterized in that: The auxiliary annular pad (24) has an arc groove on its left side close to the center, and the right end of the arc groove passes through the main annular block (31) and the annular scraper assembly (38).

Images