Hydraulic casing centralizer

Abstract

The utility model relates to the technical field of centralizers, and discloses a hydraulic casing centralizer which comprises an outer connecting pipe and a connector pipe, a casing is slidably connected into the outer connecting pipe, an annular limiting cavity is formed in the rear end of the outer connecting pipe, and a plurality of strip-shaped positioning openings are formed in the outer wall of the outer connecting pipe at intervals. Each strip-shaped positioning opening is provided with a limiting elastic piece fixed to the sleeve and the connector pipe, and a plurality of supporting and positioning devices matched with the limiting elastic pieces are arranged in the sleeve. The centralizer is simple in structure and can adapt to centering correction of oil pipes of oil wells of different sizes, the sleeve is installed in the annular limiting cavity of the outer connecting pipe and clamped in the outer connecting pipe through the connector pipe, axial movement of the sleeve can be effectively limited, and the stability of the centralizer in the working process is improved; and the limiting elastic pieces are installed on the casing pipe and the external connecting pipe and matched with the supporting and positioning device arranged in the casing pipe, so that the device can adapt to oil wells of different sizes, and the central position of the pipe body is guaranteed by injecting pressure into different pipes.

Description

Technical Field

[0001] The utility model relates to the technical field of centralizers, in particular to a hydraulic casing centralizer. Background Art

[0002] In the process of oil and gas extraction, cementing technology is one of the most important links. The purpose of cementing is to support the well wall and isolate the fluids between different formations to ensure the safety and efficient production of oil and gas wells. In cementing construction, the centralizer is a commonly used tool and its main function is to ensure that the casing remains centered in the wellbore, thereby improving the cementing quality.

[0003] Although traditional centralizers can assist in centering the casing, they have some obvious limitations when used in horizontal wells. First, the outer diameter of conventional centralizers is large, which makes it difficult to lower them into the wellbore, especially in narrow horizontal well sections. Second, centralizers with large outer diameters may cause damage to the wellbore wall, especially in formations with poor wellbore stability. These problems limit the application effect of existing centralizers in horizontal well cementing.

[0004] At present, centralizers of various forms and specifications are widely used in cementing construction. In the prior art, the "hydraulic casing centralizer" with patent number CN201621471090.3 has poor casing centering during the cementing process of horizontal wells. Therefore, the thickness of the cement ring formed after cementing is uneven, which directly leads to the decline in the cementing quality of horizontal wells. This quality problem seriously affects the advantages of horizontal wells, such as high production and low well construction cost. Utility Model Content

[0005] The utility model aims to provide a hydraulic casing centralizer which can adapt to oil wells of different sizes in view of the above problems.

[0006] In order to achieve the above-mentioned purpose, the utility model discloses a hydraulic casing straightener, comprising an external tube and an interface tube arranged at the front end of the external tube, and its structural characteristics are that the internal part of the external tube is slidably connected with the casing, and the internal part of the rear end of the external tube is provided with an annular limiting chamber for clamping the casing, and the outer wall of the annular external tube is provided with a plurality of strip locating openings arranged along the length direction of the external tube at intervals, and each strip locating opening is provided with a limiting spring sheet with one end fixed to the outer wall of the casing and the other end fixed to the interface tube, and a plurality of supporting positioning devices passing through the casing body and cooperating with the limiting spring sheets are provided in the casing.

[0007] After adopting the above structure, by installing the casing in the annular limiting chamber of the external tube and clamping the casing in the external tube through the interface tube, the axial movement of the casing can be effectively limited, and the stability of the stabilizer during operation can be improved. By installing the limiting spring clip on the casing and the external tube and cooperating with the supporting positioning device set inside the casing, it can adapt to oil wells of different sizes and ensure the center position of the pipe body by injecting pressure into different pipes.

[0008] Preferably, the outer walls of the front and rear ends of the external tube are provided with external threads, the interface tube is threadedly connected to the outer wall of the external tube, and the diameter of the tube opening of the interface tube body is smaller than the inner diameter of the front end of the external tube body. The smaller inner diameter of the interface tube can be conveniently used to limit the inner sleeve of the external tube.

[0009] Preferably, the front end and the rear end of the sleeve are respectively provided with a first sealing ring and a second sealing ring, and the outer diameter of the sleeve is larger than the inner diameter of the interface tube, and a stopper ringing the outer wall of the sleeve is provided on the outer wall of the sleeve behind the first sealing ring, and a stopper matched with the stopper is provided on the inner wall of the outer tube and close to the strip-shaped positioning opening. The first sealing ring and the second sealing ring can effectively ensure the airtightness of the sleeve sliding in the outer tube, and the cooperation of the stopper and the stopper can effectively protect the first sealing ring and prevent damage to the first sealing ring.

[0010] Preferably, a boss is provided in the tube body at the rear end of the external tube, which is arranged around the inner wall of the external tube. The annular limiting chamber is a groove body arranged around the boss and the groove body is arranged along the axial direction of the external tube. The cross-sectional size of the annular limiting chamber is adapted to the cross-sectional size of the tube body at the rear end of the sleeve. The depth of the annular limiting chamber is adapted to the distance between the external tube mouth and the front end of the strip positioning port. By inserting the external tube into the annular limiting chamber and moving it in the annular limiting chamber, the stability of the sleeve when sliding can be effectively improved.

[0011] Preferably, a plurality of exhaust ports spaced apart from each other on the outer wall of the interface pipe are provided on the rear end tube body of the interface pipe, and the exhaust ports are connected to the rear end of the annular limiting chamber, and a one-way valve is provided at the opening of the exhaust port. By providing the exhaust port at the rear end of the annular limiting chamber, excess air can be effectively discharged to ensure the normal operation of the sleeve.

[0012] Preferably, the width of the strip-shaped positioning opening is adapted to the width of the limiting spring sheet and the length of the strip-shaped positioning opening is smaller than the length of the sleeve.

[0013] Preferably, a fixing frame is fixedly connected to the sleeve at the front end of the strip-shaped positioning opening, the fixing frame is a rectangular block, and a fixing bolt penetrating the rectangular block and screwed on the outer wall of the sleeve is arranged on the upper end surface of the rectangular block, a first clamping groove for clamping the limiting spring piece is arranged on the rear end surface of the rectangular block, and a second clamping groove for clamping the limiting spring piece is arranged on the inner wall at the rear end of the strip-shaped positioning opening. By clamping the two ends of the limiting spring piece on the first clamping groove and the second clamping groove respectively, the front end of the limiting spring piece is driven to move backward by the movement of the sleeve, so that the limiting spring piece is bent to play a supporting and limiting role on the tube body.

[0014] Preferably, the support and positioning device includes a top column arranged at the position passing through the casing and the strip positioning opening and supported on the lower end surface of the limiting spring piece, a pressure baffle is arranged at the bottom of the top column located in the casing, and a positioning block is screwed on the column located outside the casing, a sink matching the positioning block is arranged at the position where the outer wall of the casing passes through the top column, and a third sealing ring is arranged at the position where the inner wall of the casing passes through the top column. By matching the top column of the support and positioning device with the pressure baffle, and controlling the top column to support the limiting spring piece through the pressure inside the pipe, the pipe body can be effectively prevented from contacting the well wall and the centering of the pipe body can be further adjusted.

[0015] To sum up, the beneficial effects of the utility model are as follows: the utility model has a simple structure and can adapt to the centering correction of oil pipes in oil wells of different sizes. The casing is installed in the annular limiting chamber of the external tube and the casing is clamped in the external tube through the interface tube, which can effectively limit the axial movement of the casing and improve the stability of the stabilizer during operation; and the limiting spring piece is installed on the casing and the external tube and cooperates with the supporting positioning device arranged inside the casing, which can adapt to oil wells of different sizes and ensure the centering position of the pipe body by injecting pressure into different pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the sleeve and the limiting spring piece matching the utility model;

[0019] Figure 4 for Figure 1 A schematic diagram of the enlarged structure of the fixing frame at B in the middle;

[0020] Figure 5 for Figure 2 Schematic diagram of the structure of the support and positioning device at A in the middle.

[0021] In the figure: 1. external pipe; 2. interface pipe; 3. sleeve; 4. annular limit chamber; 5. strip positioning port; 6. limit spring; 7. support positioning device; 8. external thread; 9. first sealing ring; 10. second sealing ring; 11. limit platform; 12. boss; 13. exhaust port; 14. one-way valve; 15. fixing bracket; 16. fixing bolt; 17. first slot; 18. second slot; 19. top column; 20. pressure baffle; 21. positioning block; 22. sink; 23. third sealing ring. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0026] like Figure 1 and Figure 2 as well as Figure 4As shown, the utility model comprises an external tube 1 and an interface tube 2 arranged at the front end of the external tube 1, a sleeve 3 is slidably connected inside the external tube 1, and a plurality of strip-shaped positioning openings 5 ​​arranged along the length direction of the external tube 1 are arranged at intervals on the outer wall of the ring external tube 1. When designed, the external tube 1 is a hollow tube structure, and external threads 8 are arranged on the outer walls of the front and rear ends of the external tube 1. The rear end of the interface tube 2 is screwed on the front end outer wall of the external tube 1, and the tube opening diameter of the interface tube 2 body is smaller than the inner diameter of the tube body at the front end of the external tube 1. The smaller inner diameter of the interface tube 2 can be conveniently It is used to limit the position of the sleeve 3 in the external pipe 1; during production, the sleeve 3 is sleeved in the body of the interface pipe 2, and the first sealing ring 9 and the second sealing ring 10 are sleeved at the front and rear ends of the sleeve 3 respectively. The outer diameter of the sleeve 3 is larger than the inner diameter of the interface pipe 2, so that the sleeve 3 can be effectively prevented from sliding out of the front end of the external pipe 1, and a limiting platform 11 is arranged on the outer wall of the sleeve 3 behind the first sealing ring 9, which is ringed on the outer wall of the sleeve 3, wherein a stopper matched with the stopper 11 is also arranged on the inner wall of the external pipe 1 and close to the strip positioning opening 5. In this way, the airtightness of the sleeve 3 sliding in the external pipe 1 can be effectively guaranteed by the first sealing ring 9 and the second sealing ring 10, and the cooperation of the stopper and the limiter 11 can effectively prevent the first sealing ring 9 from sliding to the strip positioning opening 5 and avoid damage to the first sealing ring 9.

[0027] like Figure 2 and Figure 3 As shown, in a preferred embodiment of the utility model, an annular limiting chamber 4 for clamping the sleeve 3 is arranged inside the rear end of the external pipe 1. When designed, a boss 12 is arranged around the inner wall of the external pipe 1 in the pipe body at the rear end of the external pipe 1, and the annular limiting chamber 4 is a groove body provided with the boss 12, and the groove body is arranged along the axial direction of the external pipe 1. At the same time, the cross-sectional size of the annular limiting chamber 4 is adapted to the cross-sectional size of the pipe body at the rear end of the sleeve 3, wherein the depth of the annular limiting chamber 4 is the distance between the pipe mouth of the external pipe 1 and the front end of the strip positioning port 5. The sizes are adapted to each other, so that by inserting the external tube 1 into the annular limiting chamber 4 and moving it in the annular limiting chamber 4, the stability of the sleeve 3 when sliding can be effectively improved. During manufacturing, a plurality of exhaust ports 13 arranged at intervals around the outer wall of the interface tube 2 are arranged on the rear end tube body of the interface tube 2, and the exhaust ports 13 are connected to the rear end of the annular limiting chamber 4, and a one-way valve 14 is also arranged at the opening of the exhaust port 13. In this way, by arranging the exhaust port 13 at the rear end of the annular limiting chamber 4, excess air can be effectively discharged to ensure the normal operation of the sleeve 3.

[0028] like Figure 2 and Figure 4As shown, in another preferred embodiment of the utility model, a limiting spring piece 6 is provided at each strip-shaped positioning opening 5, one end of which is fixed to the outer wall of the sleeve 3 and the other end is fixed to the interface pipe 2. When designing, the width of the limiting spring piece 6 is adapted to the width of the strip-shaped positioning opening 5 and the length of the strip-shaped positioning opening 5 is smaller than the length of the sleeve 3. When manufacturing, a fixing frame 15 is fixedly connected to the sleeve 3 at the front end of the strip-shaped positioning opening 5. The fixing frame 15 is a rectangular stopper and a rectangular stopper is provided on the upper end surface thereof. There is a fixing bolt 16 that passes through the rectangular stopper and is screwed on the outer wall of the sleeve 3, and a first slot 17 for clamping the limiting spring piece 6 is provided on the rear end surface of the rectangular stopper. At the same time, a second slot 18 for clamping the limiting spring piece 6 is provided on the inner wall at the rear end of the strip positioning opening 5. In this way, the two ends of the limiting spring piece 6 are respectively clamped on the first slot 17 and the second slot 18, and the front end of the limiting spring piece 6 is driven to move backward through the movement of the sleeve 3, so that the limiting spring piece 6 is bent to play a supporting and limiting role on the tube body.

[0029] like Figure 2 and Figure 3 as well as Figure 5 As shown, in a specific embodiment of the utility model, a plurality of supporting and positioning devices 7 passing through the main body of the sleeve 3 and cooperating with the limiting spring piece 6 are further arranged in the sleeve 3, and the supporting and positioning device 7 includes a top column 19 arranged at a position passing through the sleeve 3 and the strip positioning opening 5 and pressing on the lower end surface of the limiting spring piece 6. During design, a pressurized baffle 20 is arranged at the bottom of the top column 19 located in the sleeve 3, and a positioning block 21 is screwed on the column located outside the sleeve 3, and the positioning block 21 can effectively prevent the top column 19 from falling into the sleeve 3; a sink groove 22 matching the positioning block 21 is arranged at the position where the outer wall of the sleeve 3 passes through the top column 19, and a third sealing ring 23 for enhancing air tightness is arranged at the position where the inner wall of the sleeve 3 passes through the top column 19. In this way, by cooperating with the top column 19 of the supporting and positioning device 7 and the pressurized baffle 20, the top column 19 is controlled by the pressure inside the pipe to support the limiting spring piece 6, which can effectively prevent the pipe body from contacting the well wall and can further adjust the centering of the pipe body. At the same time, the supporting and positioning device 7 can further enhance the supporting capacity of the limiting spring piece 6, and the staff can also inject different pressures into the oil pipe to ensure the center position of the pipe body.

[0030] During use, the device is screwed on the ends of every two oil pipes, and multiple groups of the above-mentioned connection groups are input according to the depth of the oil well. When concrete needs to be poured, since the connection between every two sections of the oil pipe is connected with the hydraulic casing straightener and the middle pipe body of the straightener has an outer diameter larger than the diameter of the oil pipe body due to the setting of the limiting spring piece 6, the oil pipe between the two groups of straighteners will have a gap from one end of the well wall. At this time, pressure is applied to the oil pipe, and the casing 3 is pushed to move by hydraulic pressure, so that the limiting spring piece 6 is further bent to support and limit the oil pipe. At the same time, the pressure inside the casing 3 controls the top column 19 to support the limiting spring piece 6. In this way, the radial and lateral forces act on the limiting spring piece 6 at the same time, making the limiting spring piece 6 more supportive and less prone to deformation.

[0031] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A hydraulic casing centralizer, comprising an external pipe (1) and an interface pipe (2) arranged at the front end of the external pipe (1), characterized in that: The external pipe (1) is slidably connected to a sleeve (3) inside, and an annular limiting chamber (4) for clamping the sleeve (3) is provided inside the rear end of the external pipe (1). A plurality of strip-shaped positioning openings (5) arranged along the length direction of the external pipe (1) are arranged at intervals on the outer wall of the annular external pipe (1). Each strip-shaped positioning opening (5) is provided with a limiting spring piece (6) having one end fixed to the outer wall of the sleeve (3) and the other end fixed to the interface pipe (2). A plurality of spring pieces (6) are provided inside the sleeve (3) and pass through the sleeve (3) body and are connected to the limiting spring piece ( 6) a supporting and positioning device (7) matched thereto, wherein a boss (12) is provided in the tube body at the rear end of the external tube (1) and surrounds the inner wall of the external tube (1), the annular limiting chamber (4) is a groove body provided around the boss (12) and the groove body is provided along the axial direction of the external tube (1), the cross-sectional size of the annular limiting chamber (4) is adapted to the cross-sectional size of the tube body at the rear end of the sleeve (3), and the depth of the annular limiting chamber (4) is adapted to the distance between the tube opening of the external tube (1) and the front end of the strip-shaped positioning opening (5).

2. The hydraulic casing centralizer according to claim 1, characterized in that: External threads (8) are provided on the outer walls of the front and rear ends of the external tube (1); the interface tube (2) is threadedly connected to the outer wall of the external tube (1); and the diameter of the tube opening of the interface tube (2) body is smaller than the inner diameter of the front end tube body of the external tube (1).

3. The hydraulic casing centralizer according to claim 1, characterized in that: The front end and the rear end of the sleeve (3) are respectively provided with a first sealing ring (9) and a second sealing ring (10), and the outer diameter of the sleeve (3) is larger than the inner diameter of the interface pipe (2). A stopper (11) is provided on the outer wall of the sleeve (3) behind the first sealing ring (9), and the stopper (11) is provided on the inner wall of the external pipe (1) and close to the inner wall of the strip-shaped positioning opening (5), and matches the stopper (11).

4. The hydraulic casing centralizer according to claim 1, characterized in that: The rear end tube body of the interface tube (2) is provided with a plurality of exhaust ports (13) arranged at intervals around the outer wall of the interface tube (2), and the exhaust ports (13) are connected to the rear end of the annular limiting chamber (4), and a one-way valve (14) is provided at the opening of the exhaust ports (13).

5. The hydraulic casing centralizer according to claim 1, characterized in that: The width of the strip-shaped positioning opening (5) is adapted to the width of the limiting spring sheet (6), and the length of the strip-shaped positioning opening (5) is smaller than the length of the sleeve (3).

6. The hydraulic casing centralizer according to claim 1, characterized in that: A fixing frame (15) is fixedly connected to the sleeve (3) at the front end of the strip-shaped positioning opening (5); the fixing frame (15) is a rectangular stopper, and a fixing bolt (16) penetrating the rectangular stopper and screwed to the outer wall of the sleeve (3) is arranged on the upper end surface of the rectangular stopper; a first clamping groove (17) for clamping the limiting spring piece (6) is arranged on the rear end surface of the rectangular stopper; and a second clamping groove (18) for clamping the limiting spring piece (6) is arranged on the inner wall at the rear end of the strip-shaped positioning opening (5).

7. The hydraulic casing centralizer according to claim 1, characterized in that: The supporting positioning device (7) comprises a top column (19) which is arranged at a position passing through the sleeve (3) and the strip positioning opening (5) and is pressed against the lower end surface of the limiting spring sheet (6); a pressure baffle (20) is arranged at the bottom of the top column (19) located inside the sleeve (3); and a positioning block (21) is screwed on the column outside the sleeve (3); a sink groove (22) matching the positioning block (21) is arranged at a position where the outer wall of the sleeve (3) passes through the top column (19); and a third sealing ring (23) is arranged at a position where the inner wall of the sleeve (3) passes through the top column (19).

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