Comprehensive treatment device and method for upward channeling of oil well casing

Abstract

The comprehensive treatment device comprises a high-pressure flexible connecting pipeline connected with an oil and gas well production valve, an adjustable centering assembly is arranged on the surface layer casing flange face of an oil and gas well, and the adjustable centering assembly comprises adjusting jackscrews which are oppositely arranged; the axes of the opposite adjusting jackscrews are arranged in the radial direction of the surface casing flange face, an adjustable telescopic short joint is vertically arranged at the center position of the adjustable centering assembly, the adjustable telescopic short joint is of a telescopic structure, and the adjustable telescopic short joint is fixedly connected with an oil-string casing. The method has the advantages that the problems of potential safety hazards caused by continuous upward channeling stress, packing piercing leakage caused by oil well wellhead deflection, difficulty in sealing filler adding and short operation sleeve descending period during treatment of upward channeling of the oil-water well sleeve in the prior art are solved.

Description

Technical Field

[0001] This application relates to the field of oilfield development technology, and in particular to a comprehensive treatment device and method for oil well casing run-through. Background Technology

[0002] Oil and water well casings generally consist of surface casing and oil layer casing. Surface casing primarily isolates the surface aquifer, and therefore its installation depth is relatively shallow. Oil layer casing serves as the conduit for oil and gas to reach the surface, mainly used to isolate the oil and gas from the formation, and therefore its installation depth is much deeper. With the rapid increase in domestic and industrial water consumption, the water level in surface aquifers has dropped, causing surface subsidence in some oil and water well areas. This results in the surface casing sinking to the same extent, while the oil layer casing, due to its greater depth, sinks less. Consequently, the oil layer casing rises relative to the surface, causing the wellhead equipment connected to it to rise in position or even deviate, affecting the normal production of the oil and water wells. Summary of the Invention

[0003] To address the safety hazards caused by continuous upward stress during the treatment of casing spurs in oil and water wells using existing technologies, as well as the problems of packing leakage due to wellhead misalignment, difficulty in installing sealing packing, and short casing removal cycle, this application provides a comprehensive treatment device and method for casing spurs in oil wells.

[0004] This application provides a comprehensive treatment device for oil well casing slippage, which adopts the following technical solution:

[0005] A comprehensive treatment device for casing slippage in oil wells includes a high-pressure flexible connection pipeline connected to the production valve of the oil and gas well. An adjustable centering assembly is provided on the surface flange of the oil and gas well. The adjustable centering assembly includes opposing adjusting screws, the axes of which are arranged along the radial direction of the surface flange. An adjustable telescopic section is vertically arranged at the center of the adjustable centering assembly. The adjustable telescopic section is telescopic and is fixedly connected to the oil layer casing.

[0006] By adopting the above technical solution, replacing the commonly used metal pipeline with a high-pressure flexible connection pipeline, and adjusting the center of the oil layer casing with an adjustable centering component, the oil layer casing located in the center can be vertically centered and upright. Furthermore, by using an adjustable telescopic short section, the height of the adjustable telescopic short section can be freely adjusted. When the casing continues to move upward after being lowered, it can be adjusted autonomously to lower the casing. This solves the safety hazards caused by continuous upward stress when the casing moves upward in oil and water wells, as well as the problems of packing leakage caused by wellhead deviation, difficulty in installing sealing packing, and short casing lowering operation cycle.

[0007] Optionally, the high-pressure flexible connection pipeline includes a high-pressure flexible composite short section, with flange joints fixedly connected to both ends of the high-pressure flexible composite short section. The flange joints are coaxially arranged with the ends of the high-pressure flexible composite short section. One end of the high-pressure flexible composite short section is fixedly connected to the production valve of the oil and gas well through the flange joint, and the other end of the high-pressure flexible composite short section is fixedly connected to the back pressure valve of the oil and gas well through the flange joint.

[0008] Optionally, the adjustable centering assembly includes a fixed seat, which is fixedly connected to the flange face of the surface sleeve, and the adjusting screw is threadedly connected to the fixed seat. Multiple fixed seats are arranged along the circumference of the flange face of the surface sleeve.

[0009] Optionally, a connecting and fixing rib is provided between two adjacent fixing seats, and the connecting and fixing rib is fixedly connected to the fixing seat.

[0010] Optionally, the connecting and fixing rib is an arc-shaped structure, and the axis of the arc of the connecting and fixing rib is coaxial with the axis of the surface sleeve flange.

[0011] Optionally, the plurality of said fixing seats are arranged in pairs facing each other.

[0012] Optionally, the adjustable telescopic section includes a vertically arranged female threaded section, and a male threaded section is coaxially arranged inside the female threaded section, and the female threaded section is threadedly connected to the male threaded section.

[0013] Optionally, the female threaded short section includes an upper short section located above and a short section sleeve located below the upper short section. The upper short section and the short section sleeve are coaxially arranged and fixedly connected. The inner diameter of the short section sleeve is larger than the outer diameter of the oil layer casing. The inner sidewall of the upper short section is threadedly connected to the outer sidewall of the male threaded casing.

[0014] Optionally, a sealing ring is provided inside the sleeve of the female snap-fit ​​sub.

[0015] This application also provides a treatment method applied to the above-mentioned comprehensive treatment device for casing slippage in oil wells, the method comprising:

[0016] S01: Modify the wellhead process by replacing the hard connection process at the wellhead with a high-pressure flexible connection pipeline to eliminate the risk of pipeline breakage caused by casing run-up.

[0017] S02: The casing of the oil well is lowered through the casing lowering operation. The adjustable telescopic short section is replaced and installed. The male threaded short section is inserted into the inside of the female threaded short section and connected together by the threads. The lower part of the female threaded short section is fitted with a sealing ring. The upper and lower parts are welded to the oil layer casing and the oil well casing short section, respectively. The oil well can achieve autonomous casing lowering by periodically disconnecting the process and rotating to lower the wellhead. It provides a technical means for further adjustment of the casing upward movement in the oil well.

[0018] S03: By installing an adjustable centering device on the surface casing flange, the adjusting screw is rotated to move along its axis, thereby centering and straightening the casing of the oil layer located at the axial position, and realizing the centering adjustment of the oil well casing and wellhead.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. Meet the actual site conditions, offset the effects of casing stress, prevent wellhead rupture and leakage, effectively straighten the wellhead, extend the casing reduction operation cycle of oil and water wells, reduce operating costs, and eliminate safety hazards in production.

[0021] 2. The wellhead process is modified by replacing the rigid connection at the wellhead with a high-pressure flexible connection pipeline, eliminating the risk of pipeline breakage caused by casing run-through. The wellhead is lowered through a casing reduction operation, and an adjustable telescopic sub is installed. This allows for autonomous casing reduction by periodically disconnecting the process and rotating the wellhead, providing a technical means to further adjust for casing run-through. An adjustable alignment device is installed on the surface casing flange to achieve alignment adjustment of the well casing and wellhead. This combination of three solutions effectively solves the safety hazards caused by continuous run-through stress in oil and water well casing management, as well as the problems of packing leakage and difficulty in installing sealing materials due to wellhead misalignment, and the short casing reduction operation cycle when using existing technologies. This makes oil and water well production safer and the management of casing run-through in oil and water wells more convenient and effective. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the high-pressure flexible connection pipeline of an oil well casing upflow comprehensive treatment device in an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the adjustable centering component and adjustable telescopic section of an oil well casing up-running comprehensive treatment device according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the adjustable centering component of an oil well casing upflow comprehensive treatment device according to an embodiment of this application.

[0025] Figure 4This is a schematic diagram of the adjustable telescopic section of an oil well casing upflow comprehensive treatment device according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. High-pressure flexible connection pipeline; 11. High-pressure flexible composite short section; 12. Flange joint; 2. Adjustable centering assembly; 21. Fixing seat; 211. Vertical plate; 212. Horizontal plate; 22. Connecting fixing rib; 23. Adjusting screw; 231. Ball bearing; 3. Adjustable telescopic short section; 31. Female thread short section; 311. Upper short section; 312. Short section sleeve; 32. Male thread short section. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses a comprehensive treatment device for oil well casing run-through. (Refer to...) Figure 1 , Figure 2 A comprehensive treatment device for casing slippage in oil wells includes a high-pressure flexible connection pipeline 1 connected to the production valves of the oil and gas well, and an adjustable centering component 2 installed on the surface casing flange of the oil and gas well. The adjustable centering component 2 can center and straighten the casing that has slipped into the oil layer. An adjustable telescopic section 3 is also vertically installed at the center of the adjustable centering component 2. The adjustable telescopic section 3 is telescopic, so that it can be automatically adjusted to lower the casing if it continues to slip upward after the casing has been lowered.

[0031] The high-pressure flexible connection pipeline 1 includes a high-pressure flexible composite short section 11 located in the middle. The high-pressure flexible composite short section 11 has a bendable structure, and flange joints 12 are fixedly connected to both ends of the high-pressure flexible composite short section 11. The flange joints 12 are coaxially arranged with the ends of the high-pressure flexible composite short section 11. One end of the high-pressure flexible composite short section 11 is fixedly connected to and communicates with the production valve of the oil and gas well through the flange joint 12, and the other end of the high-pressure flexible composite short section 11 is fixedly connected to and communicates with the back pressure valve of the oil and gas well through the flange joint 12.

[0032] In some embodiments, the high-pressure flexible connection pipeline 1 is 1.5 meters to 1 meter long, has a diameter of DN50, and a pressure of 25 MPa. It includes a high-pressure flexible composite pipe short section and a flange joint 12, and is used to replace commonly used metal pipelines.

[0033] Reference Figure 2 , Figure 3 The adjustable centering component 2 includes a fixed seat 21. Multiple fixed seats 21 are equidistantly arranged along the axis of the surface sleeve flange surface, and the number of fixed seats 21 is even. The fixed seats 21 on the surface sleeve flange surface are arranged in pairs opposite each other, and the line connecting the two opposite fixed seats 21 is arranged radially along the surface sleeve flange surface, so that the intersection of the lines connecting the two opposite fixed seats 21 is located at the axial center of the surface sleeve flange surface.

[0034] The fixing seat 21 has an "L"-shaped structure and includes a vertically arranged vertical plate 211 and a horizontally arranged horizontal plate 212 located below the vertical plate 211. The vertical plate 211 and the horizontal plate 212 are fixedly connected. The horizontal plate 212 of the fixing seat 21 is fixedly connected to the flange face of the surface sleeve, and a connecting fixing rib 22 is provided between two adjacent fixing seats 21. The ends of the connecting fixing rib 22 are fixedly connected to the two adjacent fixing seats 21 respectively. The connecting fixing rib 22 has an arc-shaped structure, and the center of the arc is coaxial with the flange face of the surface sleeve. The connecting fixing rib 22 limits the fixing seat 21 and reduces the possibility of lateral slippage of the fixing seat 21.

[0035] An adjusting screw 23 is horizontally arranged on the vertical plate 211 of the fixed base 21. The adjusting screw 23 is arranged along the radial direction of the surface sleeve flange face. The adjusting screw 23 is threadedly connected to the vertical plate 211 of the fixed base 21. By rotating the rod to adjust the adjusting screw 23, the adjusting screw 23 can be moved along the radial direction of the surface sleeve flange face. In this way, the two opposing adjusting screws 23 can be used to center and straighten the upper oil layer sleeve located in the center.

[0036] A ball bearing 231 is coaxially arranged at one end of the adjusting screw 23 near the flange face of the surface sleeve. The ball bearing 231 is in rolling connection with the adjusting screw 23, and one end of the ball bearing 231 extends out from the end of the adjusting screw 23 and rolls against the sleeve to reduce damage to the sleeve.

[0037] In some embodiments, the fixing seat 21 is L-shaped, 10-14cm long, with a bottom height of 3-5cm, a DN20 through hole for fixing screws, a height of 10-15cm, and a DN18 set screw hole at the top. A DN18 adjusting set screw 23 is installed, and the adjusting set screw 23 is used to center and straighten the upper oil layer casing through the set screw hole of the fixing seat 21.

[0038] The adjustable telescopic short section 3 includes a vertically arranged female short section 31, the axis of which is coaxial with the axis of the surface sleeve flange, and a male short section 32 is coaxially arranged inside the female short section 31, with the inside of the female short section 31 threadedly connected to the outer wall of the male short section 32.

[0039] Reference Figure 2 , Figure 4 The female short section 31 includes an upper short section 311 and a short section sleeve 312 coaxially arranged. The upper short section 311 is located above the short section sleeve 312. Both the upper short section 311 and the short section sleeve 312 are tubular structures, and their interiors are relatively connected. The upper short section 311 and the short section sleeve 312 are fixedly connected. The inner diameter of the short section sleeve 312 is larger than the inner diameter of the upper short section 311, and the inner diameter of the short section sleeve 312 is larger than the inner diameter of the oil layer casing. The inner sidewall of the upper short section 311 is threadedly connected to the outer sidewall of the male short section 32.

[0040] A sealing ring is provided inside the female short section 31 at a position relative to the short section sleeve 312. The sealing ring has an annular structure and is coaxially arranged with the female short section 31.

[0041] In some embodiments, the female threaded short section 31 is a 2.5-3 meter oil layer casing short section. The upper part of the short section has a 1.2-1.6 meter internal full female thread, and the lower part has a 1.2-1.6 meter short section sheath 312 with an inner diameter larger than the oil layer casing. The male threaded short section 32 is a 1.2-1.6 meter male threaded short section 32, which is used to assist in casing lowering operations. After removing the casing that protrudes above the oil layer, the female threaded short section 31 is installed and welded on the oil well casing short section, and the male threaded short section 32 is screwed into the female threaded short section 31. The oil layer casing is then welded on. When the casing continues to move upward after lowering, an autonomous lowering adjustment within 1 meter can be performed.

[0042] This application also provides a treatment method applied to the above-mentioned comprehensive treatment device for casing slippage in oil wells, the method comprising:

[0043] S01: Modify the wellhead process by replacing the hard connection process at the wellhead with a high-pressure flexible connection pipeline 1 to eliminate the risk of pipeline breakage caused by casing upward movement.

[0044] S02: The casing of the oil well is lowered through the casing lowering operation. The adjustable telescopic short section 3 is replaced and installed. The male threaded short section 32 is inserted into the inside of the female threaded short section 31 and connected together by the threads. The lower part of the female threaded short section 31 has a sealing ring installed on the short section sheath 312. The upper and lower parts are welded to the oil layer casing and the oil well casing short section, respectively. The oil well can achieve autonomous casing lowering by periodically disconnecting the process and rotating to lower the wellhead. It provides a technical means for further adjustment of the casing upward movement of the oil well.

[0045] S03: By installing an adjustable centering device on the surface casing flange, rotating the corresponding adjusting screw 23 causes the adjusting screw 23 to move along its axis. The adjusting screw 23 centers and straightens the upper oil layer casing located at the axial position, thereby achieving centering adjustment of the oil well casing and wellhead.

[0046] In this invention, the term "multiple" refers to at least two or more, unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A comprehensive treatment device for casing slippage in oil wells, characterized in that: It includes a high-pressure flexible connection pipeline (1) connected to the production valve of the oil and gas well, and an adjustable centering assembly (2) is provided on the surface casing flange of the oil and gas well. The adjustable centering assembly (2) includes an adjusting top screw (23) arranged opposite to each other. The axis of the opposite adjusting top screw (23) is arranged along the radial direction of the surface casing flange. An adjustable telescopic section (3) is vertically arranged at the center of the adjustable centering assembly (2). The adjustable telescopic section (3) is a telescopic structure and is fixedly connected to the oil layer casing.

2. The comprehensive treatment device for casing slippage in oil wells according to claim 1, characterized in that: The high-pressure flexible connection pipeline (1) includes a high-pressure flexible composite short section (11). Both ends of the high-pressure flexible composite short section (11) are fixedly connected to flange joints (12). The flange joints (12) are coaxially arranged with the ends of the high-pressure flexible composite short section (11). One end of the high-pressure flexible composite short section (11) is fixedly connected to the oil and gas well production valve through the flange joint (12), and the other end of the high-pressure flexible composite short section (11) is fixedly connected to the oil and gas well back pressure valve through the flange joint (12).

3. The comprehensive treatment device for casing slippage in oil wells according to claim 1, characterized in that: The adjustable centering assembly (2) includes a fixed seat (21), which is fixedly connected to the flange face of the surface sleeve. The adjusting screw (23) is threadedly connected to the fixed seat (21), and multiple fixed seats (21) are arranged along the circumference of the flange face of the surface sleeve.

4. The comprehensive treatment device for casing slippage in oil wells according to claim 3, characterized in that: A connecting fixing rib (22) is provided between two adjacent fixing seats (21), and the connecting fixing rib (22) is fixedly connected to the fixing seat (21).

5. The comprehensive treatment device for casing slippage in oil wells according to claim 4, characterized in that: The connecting and fixing rib (22) has an arc-shaped structure, and the axis of the arc of the connecting and fixing rib (22) is coaxial with the axis of the surface sleeve flange.

6. The comprehensive treatment device for casing slippage in oil wells according to claim 3, characterized in that: The plurality of the fixing seats (21) are arranged in pairs facing each other.

7. The comprehensive treatment device for casing slippage in oil wells according to claim 1, characterized in that: The adjustable telescopic section (3) includes a vertically arranged female snap section (31), and a male snap section (32) is coaxially arranged inside the female snap section (31). The female snap section (31) and the male snap section (32) are threadedly connected.

8. The comprehensive treatment device for casing slippage in oil wells according to claim 7, characterized in that: The female short section (31) includes an upper short section (311) located above and a short section sleeve (312) located below the upper short section (311). The upper short section (311) and the short section sleeve (312) are coaxially arranged and fixedly connected. The inner diameter of the short section sleeve (312) is larger than the outer diameter of the oil layer casing. The inner sidewall of the upper short section (311) is threadedly connected to the outer sidewall of the male short section casing.

9. The comprehensive treatment device for casing slippage in oil wells according to claim 8, characterized in that: A sealing ring is provided inside the short section sleeve (312) of the female buckle short section (31).

10. A governance method, characterized in that, The method of the comprehensive treatment device for casing slippage in oil wells according to any one of claims 1-9 includes: S01: Modify the wellhead process and replace it with a high-pressure flexible connection pipeline (1) to replace the hard connection process at the wellhead of the oil well and eliminate the risk of pipeline breakage caused by casing upward movement. S02: The casing of the oil well is reduced by the casing reduction operation. The adjustable telescopic short section (3) is replaced and installed. The male threaded short section (32) is inserted into the inside of the female threaded short section (31) and connected together by the threads. The lower short section sleeve (312) of the female threaded short section (31) is fitted with a sealing ring. The upper and lower parts are welded to the oil layer casing and the oil well casing short section respectively. The oil well can be reduced by rotating the wellhead by periodically disconnecting the process. This provides a technical means to further adjust the casing upward movement of the oil well. S03: By installing an adjustable centering device on the surface casing flange, the adjusting top screw (23) is rotated to move along its axis, thereby centering and straightening the upper oil layer casing located at the axial position, and realizing the centering adjustment of the oil well casing and wellhead.

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