A downhole centralizer with combined reaming and diversion plugging functions

Abstract

The present invention relates to the technical field of drilling machinery, and in particular to a downhole centralizer with combined eye-reaming and diversion plugging functions, comprising a spiral centralizer, a sliding valve device, a connecting part and a ball receiver, wherein a sliding valve device is arranged inside the spiral centralizer, the outer side of the lower end of the sliding valve device is fixedly connected to the connecting part, the inner side of the upper end of the connecting part is fixedly connected to the spiral centralizer, and the inner side of the lower end of the connecting part is fixedly connected to the ball receiver. In the present invention, the spiral centralizer, the sliding valve device, the connecting part and the ball receiver are arranged, so that the device structure has high reliability and a wide range of applications, and can be applied to most drilling operations. By superimposing the diversion function with the eye-reaming, back-reaming, micro-expansion, under-sizing and other different centralizer functions, the drilling and completion time efficiency is improved, the drilling and completion operation risks are reduced, and the device can be reused at the same time, and can be reused after being disassembled, non-destructively tested, replaced with wearing parts and installed and tested to be qualified, and the device is relatively simple to repair and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of drilling machinery, in particular to a downhole centralizer capable of combining reaming and diversion plugging functions. Background Art

[0002] The stabilizer, also known as the centralizer, is a tool that stabilizes downhole drilling tools and prevents them from deviating. It is connected to a section of the drill pipe column near the large-diameter drilling tool and is used to stabilize the drilling direction. It is an important tool for preventing well inclination changes in oil, natural gas and geological exploration drilling projects.

[0003] Due to the complex working conditions downhole, during the drilling process, ordinary stabilizers have a short working life in the well and often fail. Most of the centralizers currently on the market do not have a diversion function. During the drilling process, large particles of plugging materials are often pumped in, resulting in pipeline blockage, which not only causes equipment damage but also affects the construction progress. Therefore, in response to the above problems, a downhole centralizer with combined reaming and diversion plugging functions is proposed. Summary of the invention

[0004] The object of the present invention is to provide a downhole centralizer which can combine the functions of reaming and diversion and plugging, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A downhole centralizer with combined eyelet reaming and diversion plugging functions comprises a spiral centralizer, a sliding valve device, a connecting part and a ball receiver. The spiral centralizer is provided with a sliding valve device inside, the outer side of the lower end of the sliding valve device is fixedly connected to the connecting part, the inner side of the upper end of the connecting part is fixedly connected to the spiral centralizer, and the inner side of the lower end of the connecting part is fixedly connected to the ball receiver.

[0007] Preferably, a spiral straightening wing is provided in the middle of the spiral straightening wing, a threaded hole and a retaining ring groove are provided on the inner side of the spiral straightening wing near the body, the spiral straightening wing is arranged in a hollow cylindrical shape, and the bottom end of the threaded hole is connected to the inner cavity of the spiral straightening wing.

[0008] Preferably, a water eyelet is provided on the left side of the spiral centralizing wing, and the direction of the water eyelet is on the circumferential section of the body. The number of the spiral centralizing wing is 3, and the spiral centralizing wing is evenly distributed on the outside of the spiral centralizer.

[0009] Preferably, the sliding valve device includes a sliding sleeve, a ball seat, a small valve ball, a sleeve and a large valve ball, the outer side of the sliding sleeve is slidably connected to the spiral stabilizer, the lower side of the sliding sleeve is provided with a ball seat, and the upper outer side of the ball seat is slidably connected to the spiral stabilizer.

[0010] Preferably, an elastic claw is provided on the inner side of the ball seat, the outer side of the lower part of the ball seat is slidably connected to the sleeve, and the outer side of the sleeve is fixedly connected to the connecting part.

[0011] Preferably, the sliding sleeve is arranged in a hollow cylindrical shape, and diversion holes are evenly opened on the outer side of the sliding sleeve, and the straight-line distance between the lower end of the diversion hole and the top end of the ball seat is equal to the diameter of the large valve ball.

[0012] Preferably, the ball receiver comprises an outer cylinder and an inner cylinder, the inner side of the upper end of the outer cylinder is detachably connected to the connecting part, the inner side of the outer cylinder is fixedly connected to the inner side of the outer cylinder, a flow channel is provided inside the outer cylinder, and a guide groove is provided outside the flow channel.

[0013] Preferably, the cross section of the flow channel is arranged in a rectangular shape, and the minimum front-to-back distance of the flow channel is 0.9 times the diameter of the large valve ball.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. High structural reliability. In order to improve reliability in harsh environments, this product does not pursue more complex functions, reduces the number of movable parts, and can withstand large displacement, high pressure, high temperature, high speed and high torque of drilling operations before and after diversion. By using different sealing materials, the operating temperature can reach above 180°C, and the internal and external pressure difference can reach above 50MPa;

[0016] 2. It has a wide range of applications and can be applied to most of the current drilling operations. Through the superposition of the diversion function and the functions of different centralizers such as reaming, back reaming, micro-reaming, and under-sizing, it can achieve the operation objectives required by customers, thereby improving the efficiency of drilling and completion and reducing the risks of drilling and completion operations;

[0017] 3. It can be reused after disassembly, non-destructive testing, replacement of wearing parts and installation test. It is easy to repair and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a front view of the present invention;

[0020] Figure 3 For the present invention Figure 1 A schematic diagram of the structure at A;

[0021] Figure 4 It is a schematic diagram of the installation structure of the slide valve device of the present invention in a normal state;

[0022] Figure 5 It is a top view of the slide valve device of the present invention in a normal state;

[0023] Figure 6 It is a schematic diagram of the installation structure of the slide valve device of the present invention in a full flow-dividing state;

[0024] Figure 7 A top view of the slide valve device of the present invention in a full flow-dividing state;

[0025] Figure 8 It is a schematic diagram of the installation structure of the slide valve device of the present invention in a semi-dividing state;

[0026] Fig. 9 A top view of the slide valve device of the present invention in a semi-dividing state;

[0027] Fig.10 It is a schematic diagram of the installation structure of the ball receiver of the present invention;

[0028] Fig.11 It is a top view of the ball receiver of the present invention in a semi-dividing state.

[0029] In the figure: 1-spiral straightener, 2-sliding valve device, 201-sliding sleeve, 202-ball seat, 203-small valve ball, 204-sleeve, 205-large valve ball, 206-elastic claw, 207-diverter hole, 3-connecting part, 4-ball receiver, 401-outer cylinder, 402-inner cylinder, 403-flow channel, 404-guide groove, 5-spiral straightening wing, 6-threaded hole, 7-circlip groove, 8-water eye hole. DETAILED DESCRIPTION

[0030] Embodiment 1:

[0031] See also Figure 1-11 , the present invention provides a technical solution:

[0032] A downhole centralizer with combined eyelet reaming and diversion plugging functions comprises a spiral centralizer 1, a sliding valve device 2, a connecting part 3 and a ball receiver 4. The spiral centralizer 1 is provided with a sliding valve device 2, the outer side of the lower end of the sliding valve device 2 is fixedly connected to the connecting part 3, the inner side of the upper end of the connecting part 3 is fixedly connected to the spiral centralizer 1, and the inner side of the lower end of the connecting part 3 is fixedly connected to the ball receiver 4.

[0033] A spiral straightening wing 5 is provided in the middle of the spiral straightening wing 1, and a threaded hole 6 and a retaining ring groove 7 are provided on the inner side of the spiral straightening wing 5 near the main body. The spiral straightening wing 1 is arranged in a hollow cylindrical shape, and the bottom end of the threaded hole 6 is connected to the inner cavity of the spiral straightening wing 1. A water eye hole 8 is provided on the left side of the spiral straightening wing 5, and the direction of the water eye hole 8 is on the circumferential section of the main body. The size of the water eye to be installed can be calculated according to the size of the drill bit water eye and the need for diversion, and the required water eye can be installed on the water eye hole 8. The number of spiral straightening wings 5 ​​is 3, and the spiral straightening wings 5 ​​are evenly distributed on the outer side of the spiral straightening wing 1. The spiral straightening wing 1 can be designed as a full-size or under-size straightening wing according to the operation needs, and can also be designed as a straightening wing with positive and negative eye teeth, and can also be designed as an eccentric micro-reamer. The centralizer has a better working effect due to the diversion function when performing eye-marking, reverse eye-marking or micro-hole expansion operations. The sliding valve device 2 includes a sliding sleeve 201, a ball seat 202, a small valve ball 203, a sleeve 204 and a large valve ball 205. The outer side of the sliding sleeve 201 is slidably connected to the spiral centralizer 1, a ball seat 202 is provided on the lower side of the sliding sleeve 201, the upper outer side of the ball seat 202 is slidably connected to the spiral centralizer 1, an elastic claw 206 is provided on the inner side of the ball seat 202, the lower outer side of the ball seat 202 is slidably connected to the sleeve 204, and the outer side of the sleeve 204 is fixedly connected to the connecting part 3. The sliding sleeve 201 is arranged in a hollow cylindrical shape, and diversion holes 207 are evenly opened on the outer side of the sliding sleeve 201, and the straight-line distance between the lower end of the diversion hole 207 and the top of the ball seat 202 is the same as that of the large valve ball 205. The diameters of the balls 205 are equal, the water eye is installed before lowering, the sleeve 201 is in a closed state, and the drilling system is in normal circulation operation. When full diversion is required, such as when larger particles of plugging materials are pumped in, the small valve ball 203 is thrown in and sent to the ball seat 202, pressurized to the inside of the sleeve 201, the pressure is opened, and the sleeve 201 moves downward. At this time, the inner hole of the sleeve 201 is connected with the main body opening of the spiral centralizer 1, and the flow can be diverted through the water eye. When partial diversion is required, such as recovery drilling, loose formation deflection or stabilization, large displacement cleaning wellbore, upper large wellbore, small wellbore drilling under the casing, directional tool displacement is limited, etc., the large valve ball 205 is thrown in. After the large valve ball 205 enters the sleeve 201 and falls on the upper end of the small valve ball 203, the large valve ball 205 is sealed at this time When the shear pressure of the ball seat 202 is applied to the inner diameter of the upper opening of the sleeve 201, the ball seat 202 is sheared and expanded outward, and the large valve ball 205 and the small valve ball 203 can enter the ball receiver 4 on the lower side through the retracted ball seat 202. The ball seat 202 is sheared and retracted, so that it can achieve drilling and diversion at the same time. The ball receiver 4 includes an outer cylinder 401 and an inner cylinder 402. The inner side of the upper end of the outer cylinder 401 is detachably connected to the connecting part 3. The inner cylinder 402 is fixedly connected to the outer cylinder 401. A flow channel 403 is provided on the inner side of the outer cylinder 401, and a guide groove 404 is provided on the outer side of the flow channel 403. The cross section of the flow channel 403 is rectangular, and the minimum front-to-back spacing of the flow channel 403 is 0.9 times, when the large valve ball 205 and the small valve ball 203 fall into the inner side of the inner cylinder 402, since the cross section of the flow channel 403 is set in a rectangular shape, and the minimum distance between the front and rear of the flow channel 403 is 0.9 times the diameter of the large valve ball 205, when the large valve ball 205 does not move downward along the center of the pipeline, but enters the pipeline along the guide groove 404 and moves along the inner wall of the pipeline, the drilling fluid can circulate through the flow channel 403, which will not affect the circulation of the drilling fluid through this tool. .

[0034] Workflow: When full diversion is required, such as when large particles of plugging materials are pumped in, the small valve ball 203 is inserted into the ball seat 202, pressed to the inside of the sleeve 201, and the pressure is turned on. The sleeve 201 moves downward, and the inner hole of the sleeve 201 is connected with the main body opening of the spiral centralizer 1, and the flow can be diverted through the water hole. When partial diversion is required, such as resuming drilling, deflection or stabilization of loose formations, large-volume cleaning of wells, upper large wells, and lower small wells of casing, When the displacement of drilling or directional tools is limited, the large valve ball 205 is put in. The large valve ball 205 enters the sleeve 201 and falls on the upper end of the small valve ball 203. At this time, the large valve ball 205 seals the inner diameter of the upper opening of the sleeve 201. When the shear pressure of the ball seat 202 is pressed, the ball seat 202 is sheared and expanded outward. The large valve ball 205 and the small valve ball 203 can pass through the retracted ball seat 202 and enter the ball receiver 4 on the lower side. After the ball seat 202 is sheared, The ball receiver 4 comprises an outer cylinder 401 and an inner cylinder 402. The inner side of the upper end of the outer cylinder 401 is detachably connected to the connecting part 3. The inner cylinder 402 is fixedly connected to the inner side of the outer cylinder 401. A flow channel 403 is provided on the inner side of the outer cylinder 401. A guide groove 404 is provided on the outer side of the flow channel 403. The cross section of the flow channel 403 is arranged in a rectangular shape. The minimum distance between the front and rear of the flow channel 403 is 0. 9 times, when the large valve ball 205 and the small valve ball 203 fall into the inner side of the inner cylinder 402, since the cross section of the flow channel 403 is set in a rectangular shape, and the minimum front-to-back spacing of the flow channel 403 is 0.9 times the diameter of the large valve ball 205, the large valve ball 205 will not move downward along the center of the pipeline, but will move along the inner wall of the pipeline after entering the pipeline along the guide groove 404, and the drilling fluid can circulate through the flow channel 403, which will not affect the circulation of the drilling fluid through this tool.

[0035] Embodiment 2:

[0036] See also Figure 1-11 , the present invention provides a technical solution:

[0037] A downhole centralizer with combined eyelet reaming and diversion plugging functions comprises a spiral centralizer 1, a sliding valve device 2, a connecting part 3 and a ball receiver 4. The spiral centralizer 1 is provided with a sliding valve device 2, the outer side of the lower end of the sliding valve device 2 is fixedly connected to the connecting part 3, the inner side of the upper end of the connecting part 3 is fixedly connected to the spiral centralizer 1, and the inner side of the lower end of the connecting part 3 is fixedly connected to the ball receiver 4.

[0038] A spiral straightening wing 5 is provided in the middle of the spiral straightening wing 1, and a threaded hole 6 and a retaining ring groove 7 are provided on the inner side of the spiral straightening wing 5 near the main body. The spiral straightening wing 1 is arranged in a hollow cylindrical shape, and the bottom end of the threaded hole 6 is connected to the inner cavity of the spiral straightening wing 1. A water eye hole 8 is provided on the left side of the spiral straightening wing 5, and the direction of the water eye hole 8 is on the circumferential section of the main body. The size of the water eye to be installed can be calculated according to the size of the drill bit water eye and the need for diversion, and the required water eye can be installed on the water eye hole 8. The number of spiral straightening wings 5 ​​is 3, and the spiral straightening wings 5 ​​are evenly distributed on the outer side of the spiral straightening wing 1. The spiral straightening wing 1 can be designed as a full-size or under-size straightening wing according to the operation needs, and can also be designed as a straightening wing with positive and negative eye teeth, and can also be designed as an eccentric micro-reamer. The centralizer has a better working effect due to the diversion function when performing eye-marking, reverse eye-marking or micro-hole expansion operations. The sliding valve device 2 includes a sliding sleeve 201, a ball seat 202, a small valve ball 203, a sleeve 204 and a large valve ball 205. The outer side of the sliding sleeve 201 is slidably connected to the spiral centralizer 1, a ball seat 202 is provided on the lower side of the sliding sleeve 201, the upper outer side of the ball seat 202 is slidably connected to the spiral centralizer 1, an elastic claw 206 is provided on the inner side of the ball seat 202, the lower outer side of the ball seat 202 is slidably connected to the sleeve 204, and the outer side of the sleeve 204 is fixedly connected to the connecting part 3. The sliding sleeve 201 is arranged in a hollow cylindrical shape, and diversion holes 207 are evenly opened on the outer side of the sliding sleeve 201, and the straight-line distance between the lower end of the diversion hole 207 and the top of the ball seat 202 is the same as that of the large valve ball 205. The diameters of the balls 205 are equal, the water eye is installed before lowering, the sleeve 201 is in a closed state, and the drilling system is in normal circulation operation. When full diversion is required, such as when larger particles of plugging materials are pumped in, the small valve ball 203 is thrown in and sent to the ball seat 202, pressurized to the inside of the sleeve 201, the pressure is opened, and the sleeve 201 moves downward. At this time, the inner hole of the sleeve 201 is connected with the main body opening of the spiral centralizer 1, and the flow can be diverted through the water eye. When partial diversion is required, such as recovery drilling, loose formation deflection or stabilization, large displacement cleaning wellbore, upper large wellbore, small wellbore drilling under the casing, directional tool displacement is limited, etc., the large valve ball 205 is thrown in. After the large valve ball 205 enters the sleeve 201 and falls on the upper end of the small valve ball 203, the large valve ball 205 is sealed at this time When the shear pressure of the ball seat 202 is applied to the inner diameter of the upper opening of the sleeve 201, the ball seat 202 is sheared and expanded outward, and the large valve ball 205 and the small valve ball 203 can enter the ball receiver 4 on the lower side through the retracted ball seat 202. The ball seat 202 is sheared and retracted, so that it can achieve drilling and diversion at the same time. The ball receiver 4 includes an outer cylinder 401 and an inner cylinder 402. The inner side of the upper end of the outer cylinder 401 is detachably connected to the connecting part 3. The inner cylinder 402 is fixedly connected to the outer cylinder 401. A flow channel 403 is provided on the inner side of the outer cylinder 401, and a guide groove 404 is provided on the outer side of the flow channel 403. The cross section of the flow channel 403 is rectangular, and the minimum front-to-back spacing of the flow channel 403 is 0.9 times, when the large valve ball 205 and the small valve ball 203 fall into the inner side of the inner cylinder 402, since the cross section of the flow channel 403 is set in a rectangular shape, and the minimum distance between the front and rear of the flow channel 403 is 0.9 times the diameter of the large valve ball 205, when the large valve ball 205 does not move downward along the center of the pipeline, but enters the pipeline along the guide groove 404 and moves along the inner wall of the pipeline, the drilling fluid can circulate through the flow channel 403, which will not affect the circulation of the drilling fluid through this tool. .

[0039] Workflow: In this embodiment, the same parts as those in Embodiment 1 are not described in detail. The difference is that when diversion operation is not required, there is no need to press the large valve ball 205 and the small valve ball 203 into the device. At this time, the sleeve 201 blocks the water eye hole 8, and water flows through the channel in the center of the device for circulation.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A downhole centralizer capable of combining reaming and diversion plugging functions, comprising a spiral centralizer (1), a sliding valve device (2), a connecting part (3) and a ball receiver (4), characterized in that: A slide valve device (2) is provided inside the spiral centralizer (1); the outer side of the lower end of the slide valve device (2) is fixedly connected to the connecting portion (3); the inner side of the upper end of the connecting portion (3) is fixedly connected to the spiral centralizer (1); and the inner side of the lower end of the connecting portion (3) is fixedly connected to the ball receiver (4); The sliding valve device (2) comprises a sliding sleeve (201), a ball seat (202), a small valve ball (203), a sleeve (204) and a large valve ball (205); the outer side of the sliding sleeve (201) is slidably connected to the spiral centralizer (1); the lower side of the sliding sleeve (201) is provided with a ball seat (202); the upper outer side of the ball seat (202) is slidably connected to the spiral centralizer (1); An elastic claw (206) is provided on the inner side of the ball seat (202); the outer side of the lower part of the ball seat (202) is slidably connected to the sleeve (204); and the outer side of the sleeve (204) is fixedly connected to the connecting part (3); The sliding sleeve (201) is arranged in a hollow cylindrical shape, and the outer side of the sliding sleeve (201) is evenly provided with diversion holes (207), and the straight-line distance between the lower end of the diversion hole (207) and the top end of the ball seat (202) is equal to the diameter of the large valve ball (205); The ball receiver (4) comprises an outer cylinder (401) and an inner cylinder (402); the inner side of the upper end of the outer cylinder (401) is detachably connected to the connecting portion (3); the inner cylinder (402) is fixedly connected to the inner side of the outer cylinder (401); a flow channel (403) is provided on the inner side of the outer cylinder (401); and a guide groove (404) is provided on the outer side of the flow channel (403).

2. A downhole centralizer capable of combining reaming and diversion plugging functions according to claim 1, characterized in that: A spiral centralizer (1) is provided with a spiral centralizer wing (5) in the middle thereof, a threaded hole (6) and a retaining ring groove (7) are provided on the inner side of the spiral centralizer wing (5) near the main body, the spiral centralizer (1) is arranged in a hollow cylindrical shape, and the bottom end of the threaded hole (6) is communicated with the inner cavity of the spiral centralizer (1).

3. A downhole centralizer capable of combining reaming and diversion plugging functions according to claim 2, characterized in that: A water eye hole (8) is provided on the left side of the spiral centralizing wing (5), and the direction of the water eye hole (8) is on the circumferential section of the body. The number of the spiral centralizing wings (5) is 3, and the spiral centralizing wings (5) are evenly distributed on the outside of the spiral centralizer (1).

4. A downhole centralizer capable of combining reaming and diversion plugging functions according to claim 1, characterized in that: The cross section of the flow channel (403) is arranged in a rectangular shape, and the minimum distance between the front and rear of the flow channel (403) is 0.9 times the diameter of the large valve ball (205).

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