Multifunctional well repairing device

Abstract

The utility model discloses a multifunctional well repairing device, and particularly relates to the technical field of oil and gas exploitation downhole tools, the multifunctional well repairing device comprises a pup joint main body of a hollow rotary body structure, the upper end of the pup joint main body is provided with a screwed joint, the bottom of the pup joint main body is provided with a downward nozzle mounting hole A, and the side wall of the pup joint main body is provided with a nozzle mounting hole B; and the nozzle mounting holes B are uniformly distributed along the circumferential direction of the nipple main body. By the adoption of the scheme, the requirements for cleaning of wax dirt on the inner wall of a shaft and cleaning of well bottom settled sand can be met at the same time, good cleaning quality is achieved, jet flow on the pup joint body is switched through ball throwing operation in the cleaning operation process, the better inner wall cleaning effect or the well bottom cleaning effect is achieved, the tripping times are reduced, and the service life of the pup joint is prolonged. The construction efficiency is improved, the period is shortened, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools for oil and gas exploitation, in particular to a multifunctional well repairing device. Background Art

[0002] In the later stage of oil well production, sand production from the bottom of the well and wax and scaling on the well wall often occur due to reasons such as decreased formation pressure, changes in fluid properties, and aging of the wellbore structure. The emergence of these phenomena seriously affects the overall production performance and oil and gas recovery rate of the oil well. After the oil well produces sand, if the liquid flow in the well cannot bring all the sand to the ground, the sand in the well will gradually settle to form a sand column, blocking the oil outlet channel, increasing flow resistance, and causing the oil well to reduce production or even stop production. At the same time, sand production will also cause wear and damage to downhole equipment, increase maintenance costs, and even cause downhole sand jam accidents, endangering personnel safety. On the other hand, wax deposition inside the oil well is very common, especially in the process of waxy crude oil production. Due to the decrease in formation pressure and temperature, the wax components in the crude oil are analyzed or dissolved to form crystals or colloids, which are adsorbed or deposited on the equipment. These wax deposits will affect the operating efficiency of the equipment, increase production costs, and even cause equipment damage or wellbore blockage.

[0003] In order to solve these problems, regular wax removal and sand flushing are important ways to improve oil well production efficiency and extend oil well life. However, there is no overall efficient tool for wax removal and well flushing, which results in the next trip of tubing only being able to perform a single process, which seriously affects the construction efficiency, construction cycle and well repair cost. Summary of the invention

[0004] In view of this, the utility model provides a multifunctional well repairing device, aiming to solve the problems of single function of wellbore cleaning tools for current oil and gas production wells and high cost of well repairing operations.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A multifunctional well repairing device comprises a short section body in a hollow rotating body structure, wherein the upper end of the short section body is provided with a threaded joint, and the key point is that: the bottom of the short section body is provided with a nozzle mounting hole A arranged downward, and the side wall of the short section body is provided with a nozzle mounting hole B, and the nozzle mounting holes B are evenly distributed along the circumference of the short section body.

[0007] By adopting the above scheme, suitable nozzles are respectively installed in the nozzle mounting hole A and the nozzle mounting hole B during use, and a jet flow is formed through the nozzle by means of a surface pump liquid to flush the sand at the bottom of the well and the inner wall of the wellbore pipe, thereby achieving the purpose of cleaning the bottom of the well and the inner wall, reducing the number of drilling trips, which is beneficial to improving the efficiency of well repair operations while reducing operating costs.

[0008] Preferably, a sliding sleeve is arranged in the main body of the short section, and the sliding sleeve comprises a hollow tubular sliding sleeve body and a limiting portion formed at the lower end of the sliding sleeve body, and a liquid guide channel is arranged in the sliding sleeve;

[0009] The short section body comprises a first short section and a second short section connected in an integral manner from top to bottom, wherein the first short section has an upper guide channel adapted to the sleeve body, the outer diameter of the limiting portion is larger than the diameter of the upper guide channel, and the second short section has a lower guide channel adapted to the limiting portion;

[0010] In the initial state, the sleeve is installed in the first short section through the shear pins, the nozzle mounting hole A and the nozzle mounting hole B are respectively located on the second short section and the first short section, and the sleeve body corresponds to the position of the nozzle mounting hole B and blocks the nozzle mounting hole B.

[0011] By adopting the above scheme, the nozzle jets in the nozzle mounting hole A and the nozzle mounting hole B can be switched by throwing a ball, realizing independent sand flushing operation or pipe inner wall cleaning operation. Under the same ground supply pressure conditions, when the nozzle mounting hole A or the nozzle mounting hole B is supplied separately, a stronger jet flow can be obtained, thereby achieving a better single flushing and cleaning effect. On the other hand, the main body of the short section adopts a split structure consisting of the first short section and the second short section, which is conducive to reducing the difficulty of processing and assembly and facilitating implementation.

[0012] As a preference: the nozzle installation hole A includes a main spray hole and N auxiliary spray holes, wherein the axis of the main spray hole coincides with the axis of the short section body, and the N auxiliary spray holes are evenly distributed on the circumferential outer side of the main spray hole and are tilted outward. With the above scheme, the nozzle jet of the main spray hole is mainly used for sand flushing operations, which can exert the greatest impact on the sand deposited at the bottom of the well, while the nozzle jet of the auxiliary spray hole can not only flush the sand deposited on the outer periphery of the bottom of the well, which is conducive to the reflux of the sand deposited, but also can wax clean the inner wall of the wellbore when the sliding sleeve is not installed.

[0013] As a preference: the nozzle mounting holes B are evenly distributed along the axis of the short section body. With the above solution, more nozzle mounting holes B can be provided without affecting the strength of the short section body to install the nozzles, so that the jet area covers the circumferential side wall of the inner tube, which is conducive to achieving a better cleaning effect.

[0014] As a preference, the nozzle mounting hole B is tilted toward the upper end of the short section body. With the above solution, because the nozzle mounting hole A is downward, and the nozzle mounting hole B is arranged to be upward, the directions of the jets generated by the two corresponding nozzles are substantially opposite, and the attachments on the cylinder wall can be flushed on both sides, and can be removed better and faster, thereby achieving a better cleaning effect.

[0015] As a preferred embodiment, the limiting part includes a disc-shaped body and petal-shaped bodies evenly distributed at the bottom of the disc-shaped body. The above solution can prevent the sliding sleeve from getting stuck, facilitate the disassembly and assembly of the sliding sleeve, and improve the disassembly and assembly efficiency.

[0016] As a preference: the first short section has a receiving cavity in the lower part thereof which is connected to the upper guide channel, and in the initial state, the limiting part is located in the receiving cavity. The above scheme is adopted to facilitate the installation of the sliding sleeve, and the first short section with the sliding sleeve can be moved alone or connected with the second short section to avoid damage to the sliding sleeve.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The multifunctional well repairing device and cleaning method provided by the utility model can simultaneously meet the cleaning requirements of the inner wall of the wellbore such as wax scale and the cleaning requirements of the sand deposited at the bottom of the well, and has good cleaning quality.

[0019] 2. During the cleaning operation, the jet flow on the short section body is switched by throwing the ball to achieve better inner wall cleaning or bottom hole cleaning effect, reduce the number of trips, improve construction efficiency, shorten the cycle and reduce operation costs.

[0020] 3. Reasonable arrangement of nozzle installation hole B is conducive to ensuring the strength of the short section body and the intermediate short section, reducing the impact of the opening and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 for Figure 1 Exploded diagram of

[0023] Figure 3 for Figure 1 A cross-sectional view of the slide sleeve (the liquid guide channel is in a conducting state);

[0024] Figure 4 for Figure 1 (the sliding sleeve liquid guide channel is in a blocked state);

[0025] Figure 5 It is a schematic diagram of the sliding sleeve structure;

[0026] In the figure: 100, short section body; 110, nozzle mounting hole A; 111, main spray hole; 112, auxiliary spray hole;

[0027] 120, nozzle mounting hole B; 130, first short section; 131, upper guide channel; 132, pin hole;

[0028] 133, receiving chamber; 134, shear pin; 140, second short section; 141, lower guide channel;

[0029] 200, sliding sleeve; 210, sliding sleeve body; 211, ball seat portion; 212, annular groove;

[0030] 220, limiting portion; 221, disc-shaped body; 222, petal-shaped body; 230, liquid guiding channel;

[0031] 300. Steel ball. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with embodiments and drawings.

[0033] refer to Figures 1 to 5 The multifunctional well repairing device shown mainly comprises a short section body 100 which is a hollow rotary tubular structure. The upper end of the short section body 100 is provided with a threaded joint, through which the short section body 100 can be quickly connected to the oil pipe for entering the well.

[0034] The bottom of the short section body 100 has a nozzle mounting hole A110 arranged downward (Note: the up and down directions in this application are based on the usage state, the end close to the bottom of the well is the bottom, and conversely, the end close to the wellhead is the top), and the side wall of the short section body 100 has a nozzle mounting hole B120, and the nozzle mounting holes B120 are evenly distributed along the circumference of the short section body 100. The nozzle mounting hole A110 and the nozzle mounting hole B120 are both connected to the inner cavity of the short section body 100, and are mainly used to install their respective adapted nozzles to form a jet flow, thereby cleaning the wellbore.

[0035] Specific reference Figure 1 , Figure 3 and Figure 4 The lower end surface of the short section body 100 is generally spherical, and the nozzle mounting hole A110 includes a main spray hole 111 and N auxiliary spray holes 112, wherein the axis of the main spray hole 111 coincides with the axis of the short section body 100, and corresponds to the lowest position of the end surface of the short section body 100, and the N auxiliary spray holes 112 are evenly distributed on the circumferential outer side of the main spray hole 111 and are inclined outward, that is, the lower end of the auxiliary spray hole 112 is farther away from the axis of the short section body 100 than the upper end. In specific implementation, the angle between the axis of the auxiliary spray hole 112 and the axis of the short section body 100 is between 5° and 15°.

[0036] In another embodiment, in order to make the nozzle installed in the nozzle mounting hole A110 more suitable for sand blasting operations, the diameter of the main spray hole 111 is larger than the diameter of the auxiliary spray hole 112, so that the jet flow ejected through the nozzle in the main spray hole 111 has a greater relative impact force and flow rate, and can achieve a better sand blasting effect.

[0037] like Figure 1and Figure 2 As shown, in this embodiment, the nozzle mounting holes B120 are staggered and evenly distributed along the axis of the short section body 100. Specifically, the nozzle mounting holes B120 are distributed in a sinusoidal shape on the short section body 100, and adjacent nozzle mounting holes B120 have fixed axial and circumferential spacings.

[0038] In the present application, in order to cooperate with the flushing effect in the nozzle mounting hole A110, the nozzle mounting hole B120 is inclined toward the upper end of the short section body 100, that is, the upper end of the nozzle mounting hole B120 is farther away from the axis of the short section body 100 relative to the lower end. Usually, the angle between the axis of the nozzle mounting hole B120 and the axis of the end short section 100 is between 20° and 50°, which can exert substantially opposite impact forces on the attachments on the inner wall of the wellbore, which is beneficial to improve the cleaning effect.

[0039] In another embodiment, in order to further improve the applicability of the tool and achieve a better bottom hole sand flushing effect or wellbore inner wall flushing effect, the short sub body 100 is also used in conjunction with the sliding sleeve 200. Figures 2 to 5 As shown, the sliding sleeve 200 includes a tubular sliding sleeve body 210 and a limiting portion 220 formed at the lower end of the sliding sleeve body 210 . The sliding sleeve 200 has a liquid guide channel 230 therein.

[0040] The pup section body 100 is a split structure, mainly including a first pup section 130 and a second pup section 140 which are connected together in an upper and lower manner. In this embodiment, the first pup section 130 and the second pup section 140 are connected together through a threaded joint, and the nozzle mounting hole B120 and the nozzle mounting hole A110 are respectively located on the first pup section 130 and the second pup section 140. The first pup section 130 has an upper guide channel 131 adapted to the sleeve body 210, and the outer diameter of the limiting portion 220 is larger than the diameter of the upper guide channel 131. The second pup section 140 has a lower guide channel 141 adapted to the limiting portion 220.

[0041] like Figure 2 and Figure 5 As shown, a pin hole 132 is provided on the side wall of the first short section 130, and an annular groove 212 is provided on the upper end side wall of the sleeve body 210. In the initial state, the sleeve 200 is installed in the first short section 130 by means of a shear pin 134. The shear pin passes through the pin hole 132 and extends into the annular groove 212, which has an axial fixing effect on the sleeve 200. The pin hole 132 is located above the nozzle mounting hole B120, and the sleeve body 210 corresponds to the position of the nozzle mounting hole B120, thereby blocking the nozzle mounting hole B120. At this time, the fluid cannot be sprayed out through the nozzle of the nozzle mounting hole B120.

[0042] In order to further improve the installation effect of the sliding sleeve 200, a receiving cavity 133 adapted to the limiting portion 220 is provided near the lower end of the first short section 130. Figure 3 and Figure 4 As shown, the receiving cavity 133 is connected with the upper guide channel 131. When the sliding sleeve 200 is in the initial state, the limiting portion 220 can be completely received in the receiving cavity 133, which does not hinder the transportation or movement of the first short section 130, and the connection operation between the first short section 130 and the second short section 140, and avoids damage to the sliding sleeve 200. On this basis, in this embodiment, the lower end of the first short section 130 adopts a male buckle structure, and the upper end of the second short section 140 adopts a female buckle structure, which can further avoid collision with the sliding sleeve 200 during the connection process.

[0043] like Figures 3 to 5 As shown, the limiting part 220 includes a disc-shaped body 221 and a petal-shaped body 222 evenly distributed at the bottom of the disc-shaped body 221. The disc-shaped body 221 is disc-shaped, and its diameter is substantially consistent with the diameter of the lower guide channel 141. The inner side of the upper end of the sliding sleeve 200 has a ball seat 211, which can be used for the steel ball 300 to be seated thereon. The ball seat 211 is an arc surface adapted to the steel ball 300 and blocks the liquid guide channel 230. In addition, in order to ensure the stability of the sliding sleeve 200, the petal-shaped body 222 in this embodiment is an arc-shaped block structure, and its outer side can be well fitted with the lower guide channel 141.

[0044] use Figures 1 to 5 The multifunctional well repairing device shown can be used with the sliding sleeve 200 or directly without the sliding sleeve 200. Specifically, nozzles of suitable sizes are installed in the nozzle installation hole A110 and the nozzle installation hole B120, and then lowered into the wellbore of the oil and gas well to be cleaned through the oil pipe string. During the drilling process, the oil pipe string is supplied with liquid through the surface liquid supply equipment. If the sliding sleeve 200 is not provided, the jet flow of the nozzles in the nozzle installation hole A110 and the nozzle installation hole B120 can clean the inner wall of the wellbore from top to bottom, and the cleaning can be done while drilling, until the cleaning of the target pipe section is completed and the drilling can be started.

[0045] If the sliding sleeve 200 is installed, during the drilling process, only the nozzle in the nozzle installation hole A110 will generate a jet flow to clean the circumferential side wall. After reaching the bottom of the well, a more sufficient sand flushing operation can be carried out. After the sand flushing is completed, the steel ball 300 is directly put in. Figure 4As shown, after the steel ball 300 is put in, because its diameter is larger than the diameter of the liquid guiding channel 230, it contacts and seals with the ball seat part 211, forming a blockage for the liquid guiding channel 230. At the same time, the surface liquid supply is increased and the shear pin is destroyed by the falling gravity. The sleeve 200 moves downward, and the inner end of the nozzle mounting hole B120 is exposed. At this time, the nozzle in the nozzle mounting hole A110 is blocked and no fluid is sprayed out. The jet flow of the nozzle in the nozzle mounting hole B120 is mainly used to clean the inner wall of the wellbore from bottom to top. Finally, the pipe string is pulled out while cleaning to end the cleaning operation. During the implementation process, the speed of lowering and pulling out the pipe string is controlled according to the return situation of the wellhead to ensure that a sufficient cleaning effect is achieved.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A multifunctional well repairing device, comprising a short section body (100) in a hollow rotating body structure, wherein the upper end of the short section body (100) has a threaded joint, characterized in that: The bottom of the short section body (100) is provided with a nozzle mounting hole A (110) arranged downward, and the side wall of the short section body (100) is provided with a nozzle mounting hole B (120), the nozzle mounting holes B (120) are evenly distributed along the circumference of the short section body (100), and nozzles are both installed in the nozzle mounting holes A (110) and the nozzle mounting holes B (120); The nozzle mounting hole A (110) comprises a main spray hole (111) and N auxiliary spray holes (112), wherein the axis of the main spray hole (111) coincides with the axis of the nipple body (100), and the N auxiliary spray holes (112) are evenly distributed on the circumferential outer side of the main spray hole (111) and are arranged to be inclined outward; The nozzle mounting hole B (120) is arranged obliquely toward the upper end of the nipple body (100).

2. The multifunctional well repairing device according to claim 1, characterized in that: A sliding sleeve (200) is arranged inside the short section body (100), the sliding sleeve (200) comprising a hollow tubular sliding sleeve body (210) and a limiting portion (220) formed at the lower end of the sliding sleeve body (210), and a liquid guide channel (230) is provided inside the sliding sleeve (200); The short section body (100) comprises a first short section (130) and a second short section (140) which are connected in an integral manner from top to bottom, wherein the first short section (130) has an upper guide channel (131) adapted to the sleeve body (210), the outer diameter of the limiting portion (220) is greater than the diameter of the upper guide channel (131), and the second short section (140) has a lower guide channel (141) adapted to the limiting portion (220); In an initial state, the sleeve (200) is installed in the first short section (130) by means of a shear pin, the nozzle mounting hole A (110) is located on the second short section (140), the nozzle mounting hole B (120) is located on the first short section (130), and the sleeve body (210) corresponds to the position of the nozzle mounting hole B (120) and blocks the nozzle mounting hole B (120).

3. The multifunctional well repairing device according to claim 1 or 2, characterized in that: The nozzle mounting holes B (120) are evenly distributed in a staggered manner along the axis of the short section body (100).

4. The multifunctional well repairing device according to claim 2, characterized in that: The limiting portion (220) comprises a disc-shaped body (221) and petal-shaped bodies (222) evenly distributed at the bottom of the disc-shaped body (221).

5. The multifunctional well repairing device according to claim 2 or 4, characterized in that: The first short section (130) has a receiving cavity (133) in the lower inner portion thereof which is in communication with the upper guide channel (131); in an initial state, the limiting portion (220) is located in the receiving cavity (133).

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