Integrated tubular column and operation method

Abstract

The invention discloses an integrated pipe column and an operation method, and belongs to the technical field of downhole operation, the integrated pipe column comprises a main body pipe, a scraping assembly and a driving assembly, the main body pipe is used for drifting, the scraping assembly is used for scraping, the driving assembly drives the scraping assembly, the driving assembly comprises a driving rod, a scraping shear pin and a baffle ring, the driving rod is arranged in the main body pipe, and the scraping shear pin is arranged in the main body pipe. The baffle ring is arranged on the driving rod, and the first end of the driving rod is fixed to the main body pipe through the scraping shear pin; the scraping shear pin can separate the driving rod from the main body pipe under the hydraulic pressure with yield strength, so that the driving rod moves in the axial direction, the scraping assembly extends out of the main body pipe, and the baffle ring can be clamped with the main body pipe to provide supporting force for the scraping assembly; the operation method comprises the following steps: drifting through the main body pipe; the lower center rod is driven to move upwards in a hydraulic mode on the ground, and meanwhile the scraping assembly protrudes to conduct scraping. According to the method, the time and the cost for independently carrying out all procedures are reduced, the operation efficiency is remarkably improved, and multiple conventional downhole operations can be specifically implemented.

Description

Technical Field

[0001] The present application belongs to the technical field of downhole operations, and in particular, relates to an integrated pipe string and an operation method. Background Art

[0002] Generally, the annual operation workload of oil fields is more than 10,000 wells, and the underground operation volume is huge. Conventional operation procedures include well washing, well cleaning, scraping, sand washing, printing, etc. Among them:

[0003] Well washing is the construction of injecting a washing fluid with certain properties into the wellbore from the ground, mixing the wax, dead oil, rust, impurities and other dirt on the well wall and the oil pipe into the washing fluid and bringing it to the ground. Well washing methods are divided into forward washing and reverse washing. Forward washing is generally used in wells with serious wax deposition on the oil pipe, and reverse washing is generally used in wells with pumping wells, water injection wells, and wells with serious wax deposition on the casing.

[0004] Well clearing is the construction work of using a cylindrical gauge of specified outer diameter and length to directly check the inner diameter and depth of the casing in the well. The purpose is to use the diameter gauge to check whether the wellbore is unobstructed and to prepare for the next construction step. Commonly used tools are diameter gauges and lead molds.

[0005] Casing scraping is the operation of running a pipe string with a casing scraper, scraping the inner wall of the casing, and removing cement, hard wax, salt scale, blasthole burrs and other debris on the inner wall of the casing. The purpose of casing scraping is to make the inner wall of the casing smooth and unobstructed, and to remove obstacles for the smooth running of other downhole tools.

[0006] Sand flushing is a process of injecting liquid into the well at high speed, using hydraulic force to disperse the sand at the bottom of the well, and using the carrying capacity of the circulating liquid flow to bring the dispersed sand to the surface.

[0007] Lead printing is a means of detecting abnormal situations encountered during well repair, such as fish falling, obstruction in well access, etc. by lowering a lead print and making a hard probe between the lead mold and the fish top or the obstruction position to determine the geometry of the fish top, depth, degree of casing damage, and depth, providing a basis for the selection of salvage tools, repair tools and processes.

[0008] At present, according to the conventional operation mode, each string can only complete a single process, which has low operation efficiency, high labor intensity, and increased operation costs. At the same time, it limits the development of improving the quality, speed and efficiency of well repair operations. Summary of the invention

[0009] The present application aims to at least to some extent solve the technical problem that each trip of the tubing string in downhole operations can only complete a single process. To this end, the present application provides an integrated tubing string and an operating method. The integrated tubing string can be used to perform multiple processes and integrate multiple operating functions, thereby reducing the time and cost of performing all processes separately, significantly improving operating efficiency, and at the same time improving the flexibility of operations. After the tubing string is lowered into the well, multiple conventional downhole operations can be carried out, with greater operational flexibility, avoiding the sequential lowering of the tubing string operations caused by different processes. The operating method can also reduce the complexity and risk of operations. Since the number of trips down the well is reduced, problems caused by operational errors or failures are also reduced, reducing the impact on the formation.

[0010] In a first aspect, an embodiment of the present application provides an integrated pipe string, the integrated pipe string comprising:

[0011] The main pipe is used for dredging the well, and the main pipe is provided with a scraping groove penetrating the pipe wall;

[0012] A scraping assembly, used for scraping, the scraping assembly is arranged in the scraping groove;

[0013] A driving assembly is arranged in the main body tube, and the driving assembly includes a driving rod, a scraping shearing nail and a retaining ring. The driving rod is arranged in the main body tube, the retaining ring is sleeved and fixed on the outer periphery of the driving rod, and the first end of the driving rod is fixed to the main body tube through the scraping shearing nail;

[0014] Wherein, the scraping shear pin can separate the driving rod from the main body tube under the condition that the pressure value at the scraping shear pin is greater than a preset value, so that the driving rod moves axially to drive at least part of the scraping assembly to extend out of the main body tube through the scraping groove;

[0015] The retaining ring can be clamped with the main body tube under the condition that at least part of the scraping assembly extends out of the main body tube, so as to provide the scraping assembly with a supporting force extending out of the main body tube through the driving rod.

[0016] Compared with the existing downhole operation, only one process can be carried out when the next trip of tubing is lifted. The present application adopts the main pipe to carry out the downhole well-clearing operation. The well-clearing can be achieved by directly descending to the designed depth. Then, the scraping assembly can be used to scrape the outer well wall, such as the casing wall. The scraping assembly is driven by the driving assembly. The driving assembly can realize the protrusion of the scraping assembly on the main pipe, thereby providing a scraping structure for scraping. In this way, multiple processes can be carried out, multiple operation functions are integrated, the time and cost of performing all processes separately are reduced, and the operation efficiency is significantly improved. On the other hand, the drive rod drives the scraping assembly through the ground hydraulic control. The scraping shear nails and the drive rod and the disconnection mode are set to apply hydraulic pressure according to the needs of the process, and the construction is carried out more targetedly. Then, the retaining ring is used to prevent the drive rod from retreating and the scraping assembly from retracting, which can ensure the smooth progress of the scraping operation and improve the flexibility of the operation. After the tubing is lowered to the well, multiple conventional downhole operations, including well-clearing and scraping, can be carried out in a targeted manner. The operation flexibility is greater, and the sequential lowering of the tubing caused by different processes is avoided.

[0017] In an optional embodiment, the driving assembly also includes a reset shear pin, and the retaining ring is fixed to the driving rod by the reset shear pin. The reset shear pin can separate the retaining ring and the driving rod under the condition that the pressure value at the reset shear pin is greater than a preset value, so that the driving rod can restore its position; during the process of the driving rod restoring its position, the scraping assembly retracts into the main body tube through mutual cooperation with the driving rod.

[0018] In an optional embodiment, the drive assembly also includes a ball seat, which is fixed in the main tube and close to the first end of the drive rod, with a gap between the ball seat and the drive rod, and the ball seat can be closed by throwing a ball; the second end of the drive rod can be closed by throwing a ball.

[0019] In an optional embodiment, the main tube is provided with a first pressure relief hole penetrating the tube wall, and the first pressure relief hole is arranged at a position corresponding to the first end of the driving rod, so that the first end of the driving rod closes the first pressure relief hole in the initial position, and when the scraping assembly protrudes, the first end of the driving rod moves beyond the position of the first pressure relief hole, so that the first pressure relief hole connects the inside and outside of the main tube.

[0020] In an optional embodiment, the main tube is provided with a second pressure relief hole penetrating the tube wall, the second pressure relief hole is provided at a corresponding position of the interval, and the aperture of the second pressure relief hole is smaller than the first pressure relief hole.

[0021] In an optional embodiment, a flange is provided on the inner wall of the main tube, and when the driving rod moves axially and the scraping assembly protrudes, the retaining ring is directly or indirectly clamped with the flange.

[0022] In an optional embodiment, the drive assembly further comprises a locking ring, which is sleeved on the outer circumference of the drive rod and connected to an end of the retaining ring close to the bottom of the well, and the retaining ring is clamped on the flange platform through the locking ring.

[0023] In an optional embodiment, the thickness of the first end of the locking ring close to the driving rod is greater than the thickness of the locking ring close to the second end of the driving rod, and the locking ring is configured as an inclined surface biased toward the retaining ring.

[0024] In an optional embodiment, a lower joint is connected to one end of the main pipe close to the bottom of the well, and the lead printing tool and the sand flushing tool are connected to the main pipe through the lower joint; or the lower joint belongs to the connection end of the lead printing tool and the sand flushing tool.

[0025] In an optional embodiment, a circulation groove is concavely arranged on the outside of the main pipe, and the circulation groove is used for the fluid of well washing and sand flushing to pass through. The circulation groove connects the two ends of the main pipe, and the circulation groove and the scraping groove are spaced apart. The cross-sectional area of ​​the circulation groove is: 400-800mm 2 .

[0026] In an optional embodiment, the integrated tubing further includes a pressure relief fitting, which includes a pressure relief nipple, a pressure relief piston and a pressure relief shear pin. The pressure relief nipple is connected to the end of the main pipe away from the bottom of the well. The pressure relief nipple is provided with a nipple pressure relief hole penetrating the inner and outer walls. The pressure relief shear pin is partially placed in the nipple pressure relief hole. The pressure relief piston is fixed in the pressure relief nipple by the pressure relief shear pin, and the pressure relief piston is provided with a fluid channel.

[0027] In an optional embodiment, the drive rod includes a central rod and a scraper piston, wherein the scraper piston is connected to an end of the central rod, and the scraper piston is located at a first end of the drive rod.

[0028] In an optional embodiment, the scraping assembly includes a scraping body, a plurality of scraping grooves are provided and the number of the scraping grooves is the same as that of the scraping bodies, and the scraping edges of the scraping bodies are arranged so that the scraping directions of part of the scraping bodies are opposite to those of another part of the scraping bodies.

[0029] In an optional embodiment, the scraping assembly also includes an elastic member, a support body, an outer pressure cap and an inner pressure cap, the elastic member includes a first elastic member and a second elastic member, the first elastic member is arranged between the scraping body and the support body, the support body is provided with a groove with an inclined surface, the support body cooperates with the center rod through the groove, the scraping body is limited by the inner pressure cap, the outer pressure cap is fixed to the main tube, and the second elastic member is arranged between the outer pressure cap and the inner pressure cap.

[0030] In a second aspect, an embodiment of the present application provides an operation method of an integrated pipe string, which adopts the above-mentioned integrated pipe string, and the operation method includes:

[0031] The integrated pipe string is lowered to the designed depth, and the well is cleared through the outer wall of the main pipe;

[0032] When scraping is required, a ball is thrown into the integrated pipe column on the ground, and the ball falls on the ball seat and closes the ball seat channel; the scraping shear pins are disconnected by hydraulic pressure on the ground, and the hydraulic drive rod moves upward and is directly or indirectly stuck in the main pipe through the retaining ring. At the same time, the scraping assembly protrudes and scrapes the outside.

[0033] Downhole operations are very time-consuming. It takes 1 to 2 days to raise the next string, not to mention the time required for other operations. If the drill is stuck or the lifting is not smooth, it will take more time. The operation method of the present application realizes the well by lowering the integrated string, and then the ball is thrown and hydraulically controlled to drive the rod axially to drive the scraping assembly to protrude, so that scraping operations can be performed. One trip down the well can perform multiple processes, including well clearing and scraping, which reduces the time and cost of performing all processes separately and significantly improves the operation efficiency. At the same time, the operation method reduces the number of times of going down the well, and the impact of each trip on the bottom of the well or the formation is significantly controlled, which reduces the complexity and risk of the operation, and also reduces the problems caused by operating errors or failures, reduces the impact on the formation, and helps to maintain the original formation environment for mining to a certain extent without causing damage.

[0034] In an optional embodiment, the operation method further includes:

[0035] When resetting is required, another ball is thrown into the integrated pipe column on the ground. The ball falls on the top of the center rod and closes the channel of the center rod. The resetting shear nails are disconnected by hydraulic means on the ground. Under hydraulic drive and gravity, the center rod descends to restore its position, and the scraping assembly retracts into the main pipe.

[0036] In an optional embodiment, the operation method further includes:

[0037] Whether the operation is normal can be determined by observing whether the numerical change trend of the ground hydraulic pressure first increases, reaches the maximum value, then drops rapidly, and then continues to increase.

[0038] In an optional embodiment, the operation method further includes:

[0039] When lifting the pipe, an impact object is dropped on the ground to disconnect the pressure relief shear nails by impact, thereby opening the short section pressure relief hole for pressure relief.

[0040] In an optional embodiment, the operation method further includes:

[0041] Well washing by circulating fluid on the surface;

[0042] By connecting the lead stamping tool to the bottom end of the main pipe, the lead stamping operation is carried out underground;

[0043] And / or a sand flushing tool is connected to the bottom end of the main pipe to perform sand flushing operation.

[0044] It can be seen from the above technical solution that the beneficial effects of this application are:

[0045] 1. The integrated pipe string can be used for underground well-clearing operations through the main pipe, and can be cleared directly to the designed depth. Then, the scraping assembly can be used to scrape the outer well wall, such as the casing wall. The scraping assembly is driven by the driving assembly. The driving assembly can realize the protrusion of the scraping assembly on the main pipe, thereby providing a scraping structure for scraping. In this way, multiple processes can be carried out, multiple operation functions are integrated, the time and cost of performing all processes separately are reduced, and the operation efficiency is significantly improved; on the other hand, the drive rod of the scraping assembly drives the scraping assembly through ground hydraulic control. The scraping shear pins and the drive rod and the disconnection mode are set to apply hydraulic pressure according to the needs of the process, and the construction is carried out more targeted. The retaining ring is used to prevent the drive rod from retreating and the scraping assembly from retracting, which can ensure the smooth progress of the scraping operation and improve the flexibility of the operation. After the pipe string is lowered to the well, a number of conventional downhole operations, including well clearing and scraping, can be carried out in a targeted manner, with greater operational flexibility, avoiding the sequential lowering of the pipe string caused by different processes.

[0046] 2. This operation method realizes well clearance by lowering the integrated pipe string, and then the driving rod is driven axially through hydraulic control by throwing a ball, which drives the scraping assembly to protrude, so that scraping operation can be performed. Multiple processes, including well clearance and scraping, can be performed in one trip down the well, which reduces the time and cost of performing all processes separately and significantly improves operation efficiency. At the same time, this operation method significantly controls the impact of each trip on the bottom of the well or the formation, since the number of trips down the well is reduced. This reduces the complexity and risk of the operation, reduces the problems caused by operating errors or failures, reduces the impact on the formation, and helps to maintain the original formation environment for mining to a certain extent without causing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A cross-sectional view showing an embodiment of an integrated tubular string;

[0049] Figure 2 A cross-sectional view showing an embodiment of an integrated tubular string;

[0050] Figure 3 An end cross-sectional view of an embodiment of an integrated tubular string is shown;

[0051] Figure 4 An end cross-sectional view of an embodiment of an integrated tubular string is shown;

[0052] Figure 5 An end cross-sectional view of an embodiment of an integrated tubular string is shown;

[0053] Figure 6 Shows Figure 5 A partial enlarged view of

[0054] Figure 7 A schematic diagram showing an embodiment of a locking ring;

[0055] Figure 8 A schematic cross-sectional view of a locking ring is shown;

[0056] Fig. 9 A schematic diagram of the connection of the lower joint is shown;

[0057] Fig.10 A schematic diagram of the connection of the lower joint is shown;

[0058] Fig.11 A perspective view showing an embodiment of an integrated tubular column;

[0059] Fig.12 A partial cross-sectional view of an embodiment of an integrated tubular string is shown;

[0060] Fig.13 A partial cross-sectional view of an embodiment of an integrated tubular string is shown;

[0061] Fig.14 A flow chart showing an operation method of an integrated pipe string;

[0062] Fig.15 A process diagram showing an operation method of an integrated pipe string;

[0063] Fig.16 An enlarged process diagram showing the method of operating the integrated pipe string is shown;

[0064] Fig.17 Shows Fig.16 An enlarged view of the pressure relief process.

[0065] Reference numerals: 100, integrated pipe column; 110, main pipe; 111, outer pipe; 111a, circulation groove; 111b, scraping groove; 111c, first pressure relief hole; 111d, second pressure relief hole; 111e, flange platform; 112, inner pipe; 120, scraping assembly; 121, scraping body; 122, elastic member; 122a, first elastic member; 122b, second elastic member; 123, support body; 124, outer pressure cap; 125, inner pressure cap; 130, driving assembly; 131, center rod; 132, inner pipe; 133, inner pipe; 134, inner pipe; 135, inner pipe; 136, inner pipe; 137, inner pipe; 138, inner pipe; 139, inner pipe; 140, inner pipe; 141, inner pipe; 142, inner pipe; 143, inner pipe; 144, inner pipe; 145, inner pipe; 146, inner pipe; 147, inner pipe; 148, inner pipe; 149, inner pipe; 150, inner pipe; 151, inner pipe; 152, inner pipe; 153, inner pipe; 154, inner pipe; 155, inner pipe; 156, inner pipe; 157, inner pipe; 158, inner pipe; 159, inner pipe; 160, inner pipe; 161, inner pipe; 162, inner pipe; 163, inner pipe; 164, inner pipe; 165, inner pipe; 166, inner pipe; 167, inner pipe; 168, inner pipe; 169, inner pipe; 170, inner pipe; 171, inner pipe; 172, inner pipe; 173, inner 2. Scraping piston; 133. Scraping shear pins; 134. Retaining ring; 135. Resetting shear pins; 136. Locking ring; 137. Ball seat; 138. Sealing ring; 140. Pressure relief pipe fitting; 141. Pressure relief nipple; 141a. Pressure relief hole of nipple; 142. Pressure relief piston; 143. Pressure relief shear pins; 150. Upper joint; 160. Lower joint; 161. Variable buckle joint; 162. Coupling; 163. Lead printing tool; 164. Sand blasting tool; 170. Ball throwing; 171. First ball throwing; 172. Second ball throwing. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0070] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0071] Please refer to Figure 1 and Figure 2 In the first aspect of the present application, an embodiment provides an integrated pipe string. When the integrated pipe string 100 is in a vertical state underground, the bottom end of the integrated pipe string 100 is close to the bottom of the well, the top end is the left end of the integrated pipe string 100 in the figure, and the bottom end is the right end of the integrated pipe string 100 in the figure. The integrated pipe string 100 includes: a main pipe 110, a scraping assembly 120 and a driving assembly 130. Since the main pipe 110 is made of steel, it has a certain strength. The hardness and strength of the outer wall of the main pipe 110 can be used to clear the well. The main pipe 110 can be used to directly go down to the designed depth to achieve clearing the well. The main pipe 110 is provided with a scraping groove 111 that penetrates the pipe wall. b. The scraping component 120 adopts the existing scraping structure, and the scraping structure has a scraping blade on the outside for scraping the well wall and the pipe wall. The scraping component 120 is installed in the scraping groove 111b, and part of the scraping component 120 is exposed, and the other part is placed in the main pipe 110. The driving component 130 can drive the scraping component 120 to protrude from the scraping groove 111b; the scraping component 120 can be used to scrape the outer well wall, such as the casing wall, and the scraping component 120 is driven by the driving component 130. The driving component 130 can realize the protrusion of the scraping component 120 on the main pipe 110, thereby providing a scraping structure for scraping.

[0072] Please refer to Figure 3 , Figure 4In an optional embodiment, the scraping assembly 120 cooperates with the driving assembly 130 inside the main tube 110, and the driving assembly 130 is installed in the main tube 110. The driving assembly 130 includes a driving rod, a scraping shear pin 133 and a retaining ring 134. The driving rod has two ends, namely a first end and a second end. The first end of the driving rod is the right end in the figure, and the second end of the driving rod is the left end in the figure. When used in underground operations, the first end of the driving rod is close to the bottom of the well, and the retaining ring 134 is close to the first end of the driving rod. The driving rod is arranged in the main tube 110 and the driving rod can move in the direction of the line connecting the first end and the second end of the driving rod. The driving rod and the main tube 110 are coaxially arranged, and the size of the driving rod can just fill the radial space left after the scraping assembly 120 is set. The retaining ring 134 is annular and is sleeved and fixed on the outer periphery of the driving rod, and is fixed by interference fit, locking or other methods; however, this fixing method is not always maintained, and the scraping shear nail 133 can be disconnected under the hydraulic pressure applied during downhole operations. This is determined by the shear strength of the scraping shear nail 133, which can be determined by the production test of the scraping shear nail 133. When the scraping shear nail 133 is disconnected, the driving rod and the main pipe 110 are no longer restricted by the connection method, and the driving rod is connected by its first The main pipe 110 itself is in the liquid, with a pressure difference between the upper and lower parts, and the pressure difference increases after pressurization, and the buoyancy of the center rod 110 increases, so that an upward force is applied to the driving rod through the ground hydraulic pressure, and the liquid tends to drive the driving rod to move, so that the driving rod moves upward. Since the hydraulic pressure in the existing pipe string is controllable, and the pipe string can be sealed by its own structure or an external ball 170, the driving rod tends to move, so that the driving rod can be controlled to move in the main pipe 110. In an optional embodiment, the driving rod includes a center rod 131 and a scraping piston 132. The center rod 131 is connected to the scraping piston 132 near the first end of the driving rod. The center rod 131 and the scraping piston 132 are fixed to each other by interference fit. The scraping piston 132 is fixed to the main tube 110 by a scraping shear pin 133. Specifically, a shear pin hole is opened on the tube wall of the main tube 110, a part of the scraping shear pin 133 is placed in the shear pin hole, and the other part of the scraping shear pin 133 is placed in the scraping piston 132 or connected in other ways.

[0073] Please refer to Figure 1In an optional embodiment, the outer periphery of the center rod 131 and the scraping assembly 120 are matched with each other in a concave-convex manner with an inclined surface, and an existing matching method can be adopted, such as a convex structure on the outer periphery of the center rod 131 and matched with a groove on the inner side of the scraping assembly 120, and the convex structure and the groove have an inclined surface, which can be separated under forces in different directions, so that the scraping assembly 120 can be driven by the force generated by the axial movement of the center rod 131, and the outer side of the scraping assembly 120 protrudes the scraping groove 111b, and part of the scraping assembly 120 is limited in the scraping groove 111b, and the scraping assembly 120 The inner dimension is larger than the outer dimension, so that the edge of the scraping component 120 is stuck in the scraping groove 111b, and the retaining ring 134 can be stuck with the main tube 110 when the center rod 131 moves axially and the scraping component 120 protrudes. The retaining ring 134 and the inner wall of the main tube 110 can adopt a snap-on structure, such as a step-shaped structure formed by a diameter-changing setting. The retaining ring 134 adopts an elastic member 122. When the retaining ring 134 moves to the diameter-changing part of the main tube 110, it can restore its deformation and be stuck at the diameter-changing part, thereby fixing the scraping component 120 in a protruding state.

[0074] The integrated tubular column 100 can be used for a variety of processes. The integrated tubular column 100 integrates a variety of operating functions, reduces the time and cost of performing all the processes separately, and significantly improves the operating efficiency. On the other hand, the center rod 131 of the scraper assembly 120 drives the scraper assembly 120 through ground hydraulic control. The scraper shear pins 133, the scraper piston 132, and the disconnection mode are set to apply hydraulic pressure according to the needs of the process, so that the construction can be carried out more specifically. The retaining ring 134 is used to prevent the center rod 131 from retreating and the scraper assembly 120 from retracting, so as to ensure the smooth progress of the scraping operation and improve the flexibility of the operation. After the tubular column is lowered to the well, a number of conventional downhole operations can be carried out in a targeted manner, including well clearing and scraping. The operation flexibility is greater, and the sequential lowering of the tubular column caused by different processes is avoided.

[0075] Please refer to Figure 5In an optional embodiment, the driving assembly 130 also includes a reset shear pin 135, and the retaining ring 134 is fixed to the center rod 131 through the reset shear pin 135. Specifically, a mounting hole is opened on the inner side of the retaining ring 134, and the inner side of the retaining ring 134 is a side connected to the outer periphery of the center rod 131. Part of the reset shear pin 135 is placed in the mounting hole, and the other part of the reset shear pin 135 is connected to the outer wall of the center rod 131 at the corresponding position, and the connection method is threaded connection or direct insertion; in an optional embodiment, the scraping shear pin 133 and the reset shear pin 135 adopt a block structure in the form of a pin; the reset shear pin 135 can be disconnected under the hydraulic pressure applied during downhole operations, and when disconnected, the center rod 131 can restore its position under the pressure difference and gravity, and the center rod 131 moves downward. During the process of the center rod 131 restoring its position, due to the cooperation method between the scraping assembly 120 and the center rod 131, the scraping assembly 120 can be retracted into the scraping groove 111b.

[0076] In an optional embodiment, the drive assembly 130 also includes a ball seat 137. The ball seat 137 has the same structure as that of existing conventional downhole tools or tubings. The middle part of the ball seat 137 has a ball seat 137 channel that runs through both ends. The ball seat 137 is fixed at one end of the main tube 110 close to the bottom of the well. The ball seat 137 is made of rubber material. The ball seat 137 channel of the ball seat 137 is provided with an outward-expanding inclined surface at the end close to the ball throwing 170. This structure is the same as the existing ball seat 137. The ball seat 137 can close its ball seat 137 channel by the ball throwing 170, and there is a gap between the ball seat 137 and the center rod 131; the end of the center rod 131 away from the bottom of the well can be closed by the ball throwing 170, and the top of the center rod 131 can be set to rubber material, or other materials, as long as the ball throwing 170 can be closed with the disconnection port of the center rod 131. In an optional embodiment, the ball throwing 170 includes a first ball throwing 171 and a second ball throwing 172, wherein the first ball throwing 171 is the ball thrown into the ball seat 137 first, and the second ball throwing 172 is the ball thrown into the top of the center rod 131 later, the opening of the ball seat 137 is smaller than the size of the first ball throwing 171 and smaller than the inner diameter of the center rod 131, and the inner diameter of the center rod 131 is smaller than the size of the second ball throwing 172 and smaller than the inner diameter of the main tube 110, thereby ensuring the smooth throwing of the ball 170, that is, the normal progress of the operation, and achieving sealing and pressure control.

[0077] In an optional embodiment, the main tube 110 is provided with a first pressure relief hole 111c penetrating the tube wall, and the first pressure relief hole 111c is arranged at a position corresponding to the scraping piston 132, that is, the first pressure relief hole 111c is located on the outside of the scraping piston 132, and the first pressure relief hole 111c is blocked by the scraping piston 132, so that the scraping piston 132 closes the first pressure relief hole 111c when it is in the initial position, and after the center rod 131 moves upward, when the scraping assembly 120 protrudes, the scraping piston 132 moves beyond the position of the first pressure relief hole 111c, at this time, the inner and outer sides of the main tube 110 are connected through the first pressure relief hole 111c, and the pressure in the integrated pipe string 100 can be released into the casing. In order to increase the pressure relief efficiency, the first pressure relief hole 111c can be set to be multiple, and the multiple first pressure relief holes 111c are distributed around the main tube 110. In an optional embodiment, the main tube 110 is provided with a second pressure relief hole 111d penetrating the tube wall. The position of the second pressure relief hole 111d is relatively close to the position of the first pressure relief hole 111c. The second pressure relief hole 111d is arranged at a corresponding position of the interval. The second pressure relief hole 111d is located at the tube wall of the corresponding main tube 110 between the first pressure relief hole 111c and the ball seat 137. The second pressure relief hole 111d is always connected to the inner and outer sides of the integrated pipe column 100, that is, it always relieves pressure. Since its size is small and only one is provided, its pressure relief process is relatively slow. Compared with the ground pressurized system, the pressure relief can be ignored, so it does not affect the normal construction. Its size setting at least needs to ensure that: the aperture of the second pressure relief hole 111d is less than the first pressure relief hole 111c. In order to ensure the slow pressure relief effect, the second pressure relief hole 111d can be set smaller, such as the inner diameter is set to 1 to 5 mm.

[0078] Please refer to Figure 6 , Figure 7 and Figure 8In an optional embodiment, the inner wall of the main tube 110 is provided with a flange 111e, and the flange 111e is formed by protruding inward from the inner wall of the bottom end of the main tube 110, so that the main tube 110 has a variable diameter setting, but the range of the variable diameter is small, as long as the retaining ring 134 can be stuck, during normal construction, when the center rod 131 moves axially and the scraping assembly 120 protrudes, the retaining ring 134 moves to the position of the flange 111e under the drive of the center rod 131, and suddenly passes over the flange 111e, and the retaining ring 134 is directly or indirectly stuck with the flange 111e. In an optional embodiment, the drive assembly 130 also includes a locking ring 136. When the locking ring 136 is used, the retaining ring 134 can be a non-elastic structural member. The locking ring 136 is a partially open annular structure, and the locking ring 136 uses an elastic member 122. The locking ring 136 is sleeved on the outer periphery of the center rod 131. The initial state of the locking ring 136 is a compressed state, and it is squeezed by the inner wall of the main tube 110, and the locking ring 136 is connected to the end of the retaining ring 134 close to the bottom of the well, so that the retaining ring 134 can be stuck on the flange platform 111e through the locking ring 136. Specifically, since the locking ring 136 is subjected to force, it can restore its deformation and extend outward when it passes over the flange platform 111e, so that the locking ring 136 can be stuck at the flange platform 111e. In an optional embodiment, the thickness of the locking ring 136 at one end close to the bottom of the well is greater than the thickness of the locking ring 136 at one end close to the retaining ring 134. The locking ring 136 is configured as an inclined surface biased toward the retaining ring 134. This configuration is based on the force applied to the locking ring 136. After the locking ring 136 is stuck in the flange platform 111e, the center rod 131 needs to maintain its position to maintain the protrusion of the scraping assembly 120. The center rod 131 will exert a force on the locking ring 136. The configuration of the locking ring 136 can enhance the strength of the locking ring 136 to a certain extent and avoid failure of the locking structure of the locking ring 136.

[0079] Please refer to Figure 1 , Fig. 9 and Fig.10In an optional embodiment, the end of the main pipe 110 away from the bottom of the well is connected to the upper joint 150, and the end of the main pipe 110 close to the bottom of the well is connected to the lower joint 160. This connection structure is an extended function of the integrated pipe string 100, so that the integrated pipe string 100 can perform more processes. The lead printing tool 163 and the sand flushing tool 164 are connected to the main pipe 110 through the lower joint 160. The lower joint 160 is a conversion joint structure. The top of the lower joint 160 can be connected and matched with the bottom end of the main pipe 110, and the bottom end of the lower joint 160 can be connected with the lead printing tool 163 and the sand flushing tool 164, thus providing a basis for the construction of the lead printing tool and the sand flushing tool 164; in an optional embodiment, the lower joint 160 belongs to the connection end of the lead printing tool 163 and the sand flushing tool 164, that is, the lead printing tool 163 and the sand flushing tool 164 themselves have matching joints, so that they can be directly connected and matched with the main pipe 110. In an optional embodiment, the lower joint 160 includes a variable joint 161 and a coupling 162. The variable joint 161 is connected to the bottom end of the main pipe 110, and the coupling 162 is connected to the bottom end of the variable joint 161. The coupling 162 has a universal interface, and the coupling 162 can be connected to the lead printing tool 163 and the sand flushing tool 164. The lead printing tool 163 adopts conventional lead printing, and the sand flushing tool 164 adopts the pen tip of the sand flushing tool 164. Through the above-mentioned connection method, the integrated pipe string 100 can perform multiple downhole operations, thereby further improving the operating efficiency and reducing construction time and cost.

[0080] Please refer to Fig.11 In an optional embodiment, a circulation groove 111a is concavely provided on the outer side of the main pipe 110. The circulation groove 111a is used for the fluid of the well washing and sand flushing tool 164 to pass through. That is, through the circulation groove 111a, the integrated pipe string 100 can wash the well and flush the sand tool 164. The fluid passes through the circulation groove 111a. The circulation groove 111a connects the two ends of the main pipe 110. Since the main pipe 110 itself can be used as a well-drilling gauge for well-drilling, the size of the circulation groove 111a cannot be set too small, mainly the cross-sectional area of ​​the circulation groove 111a. If the area is too small, the fluid sand carrying capacity is weak and the drill is easily stuck. The area cannot be too large. A large area affects the strength of the main pipe 110. The cross-sectional area of ​​the circulation groove 111a is set to: 400-800mm 2, such as the size of 15mm*40mm; in an optional embodiment, the circulation groove 111a and the scraping groove 111b are spaced apart. This is the case where multiple scraping grooves 111b and scraping components 120 are provided. The circulation groove 111a needs to be provided to avoid the scraping groove 111b and cannot affect the structural strength of the main tube 110. The scraping component 120 is generally symmetrically arranged, or symmetrically arranged in an upper and lower offset manner. In this way, the circulation groove 111a can be set to three sections, and the two sections of the circulation groove 111a are arranged in the same axial direction and avoid the scraping groove 111b, and the two sections of the circulation groove 111a are connected by the third section, as shown in the figure.

[0081] Please refer to Fig.12 In an optional embodiment, the integrated pipe string 100 further includes a pressure relief pipe fitting 140, through which the integrated pipe string 100 is connected to the joint 150, the pressure relief pipe fitting 140 includes a pressure relief nipple 141, a pressure relief piston 142 and a pressure relief shear nail 143, the pressure relief nipple 141 is a pipe fitting structure, the pressure relief nipple 141 is connected to the end of the main pipe 110 away from the bottom of the well, the pressure relief nipple 141 is provided with a nipple pressure relief hole 141a penetrating the inner and outer walls, the nipple pressure relief hole 141a is located in the middle of the pressure relief nipple 141, the pressure relief shear nail 143 is similar to the above-mentioned reset shear nail 135 or scraping shear nail 133, and the pressure relief shear nail 143 is partially placed in the nipple pressure relief hole 141a The other part of the pressure relief shear nail 143 is connected to the outside of the pressure relief piston 142, so that the pressure relief piston 142 is fixed in the pressure relief short joint 141 through the pressure relief shear nail 143, and the pressure relief piston 142 is provided with a fluid channel, and its two ends are connected, so that it is convenient for the ball 170 to pass through the pressure relief piston 142; when the integrated pipe string 100 is lifted, since the downhole is full of fluid, the lifting will bring the fluid out, causing pollution to the well site, or the lifting pulling force is too large, and the use of relief pipe parts can avoid the above situation. During the specific operation, an impact object is thrown into the integrated pipe string 100 to hit and disconnect the pressure relief shear nail 143, the pressure relief piston 142 moves downward, and the short joint pressure relief hole 141a opens to achieve the pressure relief effect. In an optional embodiment, the main tube 110 includes an outer tube 111 and an inner tube 112. The inner tube 112 is placed inside the top end of the outer tube 111. The inner tube 112 is threadedly connected and fixed to the outer tube 111. Other connection methods can also be used. The pipe mouth of the inner tube 112 is used to connect to the bottom end of the pressure relief short section 141. The outer tube 111 serves as the main structure of the main tube 110. The scraping groove 111b is opened on the tube wall of the outer tube 111. The ball seat 137 is arranged at the bottom end of the outer tube 111. The bottom end pipe mouth of the outer tube 111 is used to connect to the lower joint 160.

[0082] Please refer to Fig.11In an optional embodiment, the scraping assembly 120 includes a scraping body 121, and a plurality of scraping grooves 111b are provided and the number is the same as that of the scraping bodies 121. The scraping blades of the scraping bodies 121 are arranged so that the scraping directions of some scraping bodies 121 are opposite to those of other scraping bodies 121. Specifically, a plurality of scraping blades are provided on the outer side of the scraping body 121, and the scraping blades can be used to scrape the outside. The inner side of the scraping body 121 is located in the main body tube 110 and is always stuck in the scraping groove 111b. A total of four scraping bodies 121 are arranged, distributed in the upper and lower parts of the main body tube 110, and two scraping bodies 121 are symmetrically arranged in each part. As shown in the figure, the scraping blade of the scraping body 121 located at the left end is arranged in the opposite direction to the scraping blade of the scraping body 121 located at the right end, so that rotation due to the action of the well wall can be avoided during the process of lifting and lowering the integrated pipe string 100.

[0083] Please refer to Fig.13 In an optional embodiment, the scraping assembly 120 also includes an elastic member 122, a support body 123, an outer pressure cap 124 and an inner pressure cap 125. The scraping assembly 120 is improved on the conventional scraping structure, and a support body 123 is added. The support body 123 is provided with a groove with an inclined surface. The support body 123 cooperates with the center rod 131 through the groove. The support body 123 replaces the original scraping body 121 and the center rod 131. The inner side of the support body 123 is provided with a groove that cooperates with the convex structure of the center rod 131. For each scraping body 121, a convex structure is correspondingly provided on the center rod 131, so that a total of 4 are provided as shown in the figure. The inclined surface of the convex structure faces the upward direction of the center rod 131, so that when the center rod 131 goes up, it can drive the support body 123 to expand outward; the elastic body includes a first elastic member 122a and a second elastic member 122b, both of which are springs. In other embodiments, An elastic member 122 capable of providing elastic force, such as a disc spring, can be used. The first elastic member is arranged between the scraping body 121 and the support body 123, so that the scraping body 121 can buffer the support body 123. When the integrated pipe column 100 encounters resistance when being lifted, the scraping body 121 can appropriately compress the first elastic member 122a to smoothly lift the integrated pipe column 100 to avoid being stuck. The scraping body 121 is limited by the inner pressure cap 125, which is arranged on the main The body tube 110 is inside and stuck on the two ends or the four edges of the scraping body 121, the outer pressure cap 124 covers the corresponding position of the inner pressure cap 125, the outer pressure cap 124 is fixed to the main body tube 110, and is fixed by screws or other means. The second elastic member 122b is arranged between the outer pressure cap 124 and the inner pressure cap 125, so that the two ends of the scraping body 121 also participate in the force and are restricted in the main body tube 110, thereby improving the stability of the scraping body 121 during scraping.

[0084] In an optional embodiment, the drive assembly 130 also includes a sealing ring 138. The sealing ring 138 is arranged in a manner similar to the existing sealing structure. The sealing ring 138 is arranged on the outer periphery of the ball seat 137 to seal the gap between the ball seat 137 and the main tube 110. The sealing ring 138 is arranged on the outer periphery of the scraping piston 132 to seal the gap between the scraping piston 132 and the main tube 110. The sealing ring 138 is arranged on the outer periphery of the top end of the center rod 131 to seal the gap between the center rod 131 and the main tube 110. Similarly, a sealing ring 138 is also arranged on the outer periphery of the pressure relief piston 142 to seal the gap between the pressure relief piston 142 and the pressure relief short section 141.

[0085] In an optional embodiment, the integrated tubing 100 uses a lower joint 160 to connect a lead printing tool 163 and a sand flushing tool 164, and is suitable for downhole operations in the oil and gas field, including well washing, well clearing, and scraping operations of oil, gas, and water well casings, as well as sand flushing tools 164 and printing operations in various well repair operations. It can implement a number of conventional downhole operations in a targeted manner, has greater operational flexibility, and avoids the sequential lowering of tubing operations caused by different processes.

[0086] Please refer to Fig.14 The second embodiment of the present application provides an integrated pipe string operation method, which uses the above-mentioned integrated pipe string 100, and the operation method includes:

[0087] S1. The integrated pipe string 100 is lowered to the designed depth of the well, and the well is dredged through the outer wall of the main pipe 110, using the hardness and structural strength of the main pipe 110 as a well dredger. If scraping is not required, the integrated pipe string 100 can be pulled out after it reaches the designed depth.

[0088] Please refer to Fig.15 and Fig.16 After the integrated pipe string 100 is lowered into the well, the operation includes:

[0089] S2. When scraping is required, a ball 170 is thrown into the integrated pipe column 100 on the ground. The ball 170 includes a first ball 171 and a second ball 172. The first ball 171 is smaller than the second ball 172. For the convenience of description, the first ball 171 is recorded as a small ball and the second ball 172 is recorded as a large ball. The left end of the figure is a large ball and the right end is a small ball. The small ball falls on the ball seat 137 and closes the channel of the ball seat 137; the scraping shear pin 133 is disconnected by hydraulic means on the ground, and the hydraulic drive lower center rod 131 and scraping piston 132 go up together, and are directly or indirectly stuck in the main pipe 110 through the retaining ring 134. For specific ways of sticking, see the description of the structure of the integrated pipe column 100. At the same time, the scraping assembly 120 protrudes and scrapes the outside, and the integrated pipe column 100 is lifted or lowered to the specified position for scraping.

[0090] When pressurizing the ground, the operation is normal by observing whether the numerical change trend of the ground hydraulic pressure is first rising, then rapidly dropping after reaching the maximum value, and then continuing to rise. When it is abnormal, the seal fails. The seal failure works together with the setting of the scraping shear nails 133. If there are no scraping shear nails 133, there is no liquid level in the well (outside the oil pipe). When the oil pipe is filled with ground construction, the liquid pressure formed by the height difference between the inside and outside of the oil pipe can support the scraping block. If shear pins are set inside, the ground pressure does not rise, which means that the sealing structure of the integrated pipe string 100 does not work. At this time, the tool still has the well-clearing function, but the scraping function is lost.

[0091] S3. After the scraping operation is completed, it can be selected whether to reset the scraping body 121. If the scraping body 121 does not need to be reset, since there is a first elastic member 122a between the scraping body 121 and the support body 123, which has a certain tube diameter contraction size, it does not affect the tube lifting operation under normal circumstances.

[0092] S4. When encountering special circumstances, the lifting force on the pipe string is large, and the scraper body 121 can be reset. When resetting is required, a large ball is thrown into the integrated pipe string 100 on the ground, and the large ball falls on the pipe mouth position at the top of the center rod 131 and closes the channel of the center rod 131, so that the upper and lower parts of the center rod 131 are separated by space. The reset shear nail 135 is disconnected by hydraulic pressure on the ground. Since the second pressure relief hole 111d is slowly releasing pressure, the fluid can be discharged into the well. Under hydraulic drive and gravity, the center rod 131 descends to restore the position, and the scraper assembly 120 retracts into the scraper groove 111b for resetting.

[0093] S5. When lifting the pipe, the fluid will be brought out due to the lifting, which may cause pollution. First, an impact object, such as a striker, is placed on the ground. The striker enters the integrated pipe string 100 and falls into the pressure relief piston 142. The pressure relief shear pin 143 is disconnected by impact, and the pressure relief piston 142 moves downward, thereby opening the short-section pressure relief hole 141a for pressure relief. For normal pipe lifting, please refer to Fig.17 .

[0094] S6. When well washing, well clearing, scraping and lead printing are required, the well is cleared by lowering the integrated tubing string 100, the well is washed by circulating fluid on the ground, scraping is performed by the above S2, and lead printing is performed downhole by connecting the lead printing tool 163 at the bottom of the main pipe 110; well washing is divided into forward well washing and reverse well washing, forward well washing means that water enters from the oil pipe, reaches the bottom of the integrated tubing string 100, and returns to the ground from the middle of the oil pipe casing, and reverse well washing means that water enters from the oil pipe casing, enters the oil pipe from the bottom of the integrated tubing string 100, and returns to the ground from the oil pipe, and well washing requires that the integrated internal is connected, that is, no ball 170 is dropped; repeat steps S3-S5.

[0095] S7. When it is necessary to perform well washing, well clearing, scraping, and sand flushing tool 164 operations, the integrated pipe string 100 is lowered for well clearing, the well is washed by circulating fluid on the ground, scraping is performed through the above S2, and the sand flushing tool 164 is connected to the bottom end of the main pipe 110 to perform sand flushing tool 164 operations, and the ground pump is turned on for circulation, and the sand is flushed by the hydraulic tool 164 and carried out; repeat steps S3-S5.

[0096] Downhole operations are very time-consuming. It takes 1 to 2 days to pull the next string, and this does not include the time required for other operations. If the drill is stuck or the lifting is not smooth, it will take more time. The operation method of the present application realizes the well by lowering the integrated string 100, and then drives the axial movement of the center rod 131 through the ball throwing 170, through hydraulic control, drives the scraping assembly 120 to protrude, so that the scraping operation can be performed. One trip down the well can perform multiple processes, including well clearing and scraping, which reduces the time and cost of performing all processes separately and significantly improves the operation efficiency; at the same time, the operation method reduces the number of times of going down the well, and the impact of each trip on the bottom of the well or the formation is significantly controlled, which reduces the complexity and risk of the operation, and also reduces the problems caused by operating errors or failures, reduces the impact on the formation, and helps to maintain the original formation environment for mining to a certain extent without causing damage.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0098] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0099] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An integrated pipe string, characterized in that: The integrated pipe column (100) comprises: A main pipe (110) is used for dredging a well, wherein the main pipe (110) is provided with a scraping groove (111b) penetrating the pipe wall; A scraping assembly (120) for scraping, wherein the scraping assembly (120) is arranged in the scraping groove (111d); A driving assembly (130) is arranged in the main body tube (110), and the driving assembly (130) comprises a driving rod, a scraping and shearing nail (133) and a retaining ring (134). The driving rod is arranged in the main body tube (110), and the retaining ring (134) is sleeved on and fixed to the outer periphery of the driving rod. The first end of the driving rod is fixed to the main body tube (110) through the scraping and shearing nail (133); The scraping shearing pin (133) is capable of separating the driving rod from the main body tube (110) under the condition that the pressure value at the scraping shearing pin (133) is greater than a preset value, so that the driving rod moves axially to drive at least part of the scraping assembly to extend out of the main body tube (133) through the scraping groove (111d); The retaining ring (134) can be engaged with the main body tube when at least part of the scraping assembly (120) extends out of the main body tube (133), so as to provide the scraping assembly with a supporting force extending out of the main body tube (110) through the driving rod.

2. The integrated pipe string according to claim 1, characterized in that: The driving assembly (130) further comprises a reset shear pin (135), the retaining ring (134) being fixed to the driving rod via the reset shear pin (135), and the reset shear pin (135) being capable of separating the retaining ring (134) from the driving rod under the condition that the pressure value at the reset shear pin (135) is greater than a preset value, so that the driving rod can restore its position; during the process of the driving rod restoring its position, the scraping assembly (120) is retracted into the main body tube (133) by mutual cooperation with the driving rod.

3. The integrated pipe string according to claim 2, characterized in that: The driving assembly (130) further comprises a ball seat (137), wherein the ball seat (137) is fixed in the main body tube (110) and is close to the first end of the driving rod, and there is a gap between the ball seat (137) and the driving rod. The ball seat (137) can be closed by throwing a ball (170); the second end of the driving rod can be closed by throwing a ball (170).

4. The integrated pipe string according to claim 3, characterized in that: The main tube (110) is provided with a first pressure relief hole (111c) penetrating the tube wall, and the first pressure relief hole (111c) is arranged at a position corresponding to the first end of the driving rod, so that the first end of the driving rod closes the first pressure relief hole (111c) in an initial position, and when the scraping assembly (120) protrudes, the first end of the driving rod moves beyond the position of the first pressure relief hole (111c), so that the first pressure relief hole (111c) is connected to the inside and outside of the main tube (110).

5. The integrated pipe string according to claim 4, characterized in that: The main body tube (110) is provided with a second pressure relief hole (111d) penetrating the tube wall, the second pressure relief hole (111d) is provided at a corresponding position of the interval, and the aperture of the second pressure relief hole (111d) is smaller than the first pressure relief hole (111c).

6. The integrated pipe string according to claim 1, characterized in that: The inner wall of the main body tube (110) is provided with a flange platform, and when the driving rod moves axially and the scraping assembly (120) protrudes, the retaining ring (134) is directly or indirectly clamped with the flange platform (112a).

7. The integrated pipe string according to claim 6, characterized in that: The driving assembly (130) further comprises a locking ring (136), wherein the locking ring (136) is sleeved on the outer circumference of the driving rod, the locking ring (136) is connected to an end of the retaining ring (134) close to the bottom of the well, and the retaining ring (134) is clamped on the flange platform (112a) through the locking ring (136).

8. The integrated pipe string according to claim 7, characterized in that: The thickness of the first end of the locking ring (136) close to the driving rod is greater than the thickness of the second end of the locking ring (136) close to the driving rod, and the locking ring (136) is configured as an inclined surface biased toward the blocking ring (134).

9. The integrated pipe string according to claim 1, characterized in that: The end of the main pipe (110) close to the bottom of the well is connected to a lower joint (160), and a lead printing tool and a sand flushing tool are connected to the main pipe (110) via the lower joint (160); or the lower joint (160) is a connection end of the lead printing tool and the sand flushing tool.

10. The integrated pipe string according to claim 1, characterized in that: The outer side of the main pipe (110) is provided with a circulation groove (111a) for the fluid for well washing and sand flushing to pass through. The circulation groove (111a) is connected to both ends of the main pipe (110). The circulation groove (111a) and the scraping groove (111b) are spaced apart. The cross-sectional area of ​​the circulation groove is 400-800 mm. 2 .

11. The integrated pipe string according to claim 1, characterized in that: It also includes a pressure relief pipe fitting (140), the pressure relief pipe fitting (140) including a pressure relief nipple (141), a pressure relief piston (142) and a pressure relief shear nail (143), the pressure relief nipple (141) is connected to the end of the main pipe (110) away from the bottom of the well, the pressure relief nipple (141) is provided with a nipple pressure relief hole (141a) penetrating the inner and outer walls, the pressure relief shear nail (143) is partially placed in the nipple pressure relief hole (141a), the pressure relief piston (142) is fixed in the pressure relief nipple (141) through the pressure relief shear nail (143), and the pressure relief piston (142) is provided with a fluid channel.

12. The integrated pipe string according to any one of claims 1 to 11, characterized in that: The driving rod comprises a central rod (131) and a scraping piston (132), wherein the scraping piston (132) is connected to the end of the central rod (131), and the scraping piston (132) is located at the first end of the driving rod.

13. The integrated pipe string according to claim 12, characterized in that: The scraping assembly (120) comprises a scraping body (121), a plurality of scraping grooves (111b) are provided and the number of the scraping grooves (111b) is the same as that of the scraping body (121), and the scraping edges of the scraping body (121) are arranged so that the scraping directions of a part of the scraping body (121) and another part of the scraping body (121) are opposite.

14. The integrated pipe string according to claim 13, characterized in that: The scraping assembly (120) further comprises an elastic member (122), a support body (123), an outer pressure cap (124) and an inner pressure cap (125); the elastic member comprises a first elastic member (122a) and a second elastic member (122b); the first elastic member (122a) is arranged between the scraping body (121) and the support body (123); the support body (123) is provided with a groove having an inclined surface; the support body (123) cooperates with the center rod (131) through the groove; the scraping body (121) is limited by the inner pressure cap (125); the outer pressure cap (124) is fixed to the main tube (110); and the second elastic member (122b) is arranged between the outer pressure cap (124) and the inner pressure cap (125).

15. An integrated pipe string operation method, characterized in that: Using the integrated pipe string according to any one of claims 1 to 14, the operation method comprises: Lowering the integrated pipe string (100) to a designed depth, and conducting well cleaning through the outer wall of the main pipe (110); When scraping is required, a ball (170) is thrown into the integrated pipe column (100) on the ground, and the ball (170) falls on the ball seat (137) and closes the ball seat channel; the scraping shear pins (133) are disconnected by hydraulic pressure on the ground, and the center rod (131) moves upward under hydraulic drive and is directly or indirectly stuck in the main pipe (110) through the retaining ring (134), and at the same time, the scraping assembly (120) protrudes and scrapes the outside.

16. The method for operating an integrated pipe string according to claim 15, characterized in that: Also includes: When resetting is required, another ball (170) is thrown into the integrated pipe column (100) on the ground, and the ball (170) falls on the top of the center rod (131) and closes the passage of the center rod (131). The resetting shear nail (135) is disconnected by hydraulic means on the ground, and under hydraulic drive and gravity, the center rod (131) moves downward to restore the position, and at the same time, the scraping assembly (120) is retracted into the main pipe (110).

17. The method for operating an integrated pipe string according to claim 16, characterized in that: Also includes: By observing whether the numerical change trend of the ground hydraulic pressure is first rising, then rapidly falling after reaching the maximum value, and then continuing to rise, it can be judged whether the operation is normal.

18. The method for operating an integrated pipe string according to claim 15, characterized in that: Also includes: When lifting the pipe, an impact object is thrown into the ground to disconnect the pressure relief shear nail (143) by impact, thereby opening the short section pressure relief hole (141a) for pressure relief.

19. The method for operating an integrated pipe string according to claim 15, characterized in that: Also includes: Well washing by circulating fluid on the surface; By connecting a lead printing tool to the bottom end of the main body pipe (110), underground lead printing operations are performed; And / or a sand flushing operation is performed by connecting a sand flushing tool to the bottom end of the main body pipe (110).

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