A pipe column type cementing slurry rapid setting anti-channeling sealing device

Abstract

This invention belongs to the technical field of cementing equipment, specifically relating to a tubing-type cement slurry rapid solidification and anti-channeling sealing device, aiming to solve the problem of unsatisfactory anti-channeling effect for cement slurry. The invention includes a wellbore, an annular cover, a tubing string, and an anti-channeling ring plug. A slurry discharge pipe is fixedly connected to the annular cover, communicating with the annulus between the wellbore and the well casing. The tubing string is arranged between the wellbore and the well casing, sleeved on the well casing, penetrating the annular cover and fixedly connected to it. The top plane of the tubing string is higher than the upper surface of the wellhead, and the lower end is inserted below the wellhead, so that the space between the tubing string and the wellbore, located on the upper surface of the wellhead, forms an anti-channeling space. An anti-channeling ring plug is slidably installed between the tubing string and the wellbore, positioned above the anti-channeling space. This invention, by adding a tubing string between the wellhead and the wellbore, greatly improves the anti-channeling sealing effect of the slurry.

Description

Technical Field

[0001] This invention belongs to the technical field of cementing devices, specifically relating to a tubular type cement slurry rapid solidification and anti-channeling sealing device. Background Technology

[0002] In the extraction of mineral resources such as oil and natural gas, drilling is typically required. However, after drilling is completed, cementing operations are necessary to protect the wellbore, prevent fluid loss from the formation, and facilitate subsequent recovery work. Cement slurry plays a crucial role in cementing operations; it forms a sealing layer between the wellbore and the wellhead, effectively protecting both and preventing fluid loss from the formation.

[0003] However, existing cementing equipment has some shortcomings. First, the existing equipment is not ideal in preventing cement slurry from flowing upwards, and cannot effectively prevent the cement slurry from impacting upwards under high pressure, which reduces the service life and stability of the equipment. Second, the existing equipment does not control the setting rate of the cement slurry precisely enough, and cannot achieve rapid setting of the cement slurry in a short time. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, namely the unsatisfactory anti-channeling effect of cement slurry, this invention provides a tubular type cement slurry rapid solidification anti-channeling sealing device.

[0005] This application discloses a tubular type cement slurry rapid solidification and anti-channeling sealing device, which adopts the following technical solution:

[0006] A tubular cement slurry rapid solidification and anti-channeling sealing device includes a wellbore, a ring cap, a tubing string, and an anti-channeling ring plug;

[0007] The bottom of the well shaft is located inside the well body, and the top is located above the wellhead of the well body;

[0008] The ring cover is laid flat on the upper surface of the wellhead of the well body to seal the wellhead. A slurry discharge pipe is also fixedly connected to the ring cover, and the slurry discharge pipe is connected to the annulus between the well body and the well cylinder.

[0009] The tubing string is arranged between the well body and the well casing. The tubing string is sleeved on the well casing, and there is a gap between the tubing string and the well casing. The tubing string passes through the ring cover and is fixedly connected to the ring cover. The top plane of the tubing string is higher than the upper surface of the well body and the well opening, and the lower end is inserted into the lower part of the well body and the well opening, so that the space between the tubing string and the well casing and located on the upper surface of the well body and the well opening forms an anti-channeling space.

[0010] An anti-slip ring is slidably installed between the tubing and the wellbore, and the anti-slip ring is located above the anti-slip space.

[0011] By adopting the above technical solution, adding a tubing string between the well body and the well casing significantly improves the slurry anti-channeling sealing effect. The top plane of the tubing string is higher than the upper surface of the wellhead, creating an anti-channeling space between the tubing string and the well casing, located on the upper surface of the wellhead. This anti-channeling space can accommodate upward-flowing slurry, thereby reducing the impact on the annulus cap and slurry discharge pipe, further improving the sealing effect.

[0012] Optionally, a connecting seat is fixedly connected to the anti-slip ring plug, and the connecting seat is limited and supported above the tubing.

[0013] By adopting the above technical solution, the connecting seat is fixedly connected to the anti-slip ring plug and overlapped on the tubing. This increases the weight of the anti-slip ring plug and also prevents the anti-slip ring plug from sliding down in the anti-slip space.

[0014] Optionally, the upper part of the outer periphery of the anti-slip ring plug is stepped; the anti-slip ring plug, the tubing, and the connecting seat form a second space; the anti-slip ring plug is located above the anti-slip space and restricts the anti-slip space below to form a first space.

[0015] The anti-slip ring plug has a slurry inlet channel, which connects the second space with the first space.

[0016] By adopting the above technical solution, when the height of the slurry rising exceeds the slurry inlet channel, on the one hand, the slurry may push the anti-slurry ring plug upward and be blocked by the connecting seat; on the other hand, the slurry may enter the second space along the slurry inlet channel, thereby achieving secondary anti-slurry.

[0017] Optionally, a buffer assembly for cushioning the connecting seat is installed on the tubing;

[0018] The buffer assembly includes an upper cover, a spring, a lower cover, and a screw. The upper cover is fixedly connected to the column and to the outer wall of the column. The upper end of the spring is fixedly connected to the upper cover, and the lower end is fixedly connected to the upper surface of the lower cover. The upper and lower covers are arranged in parallel, and the spring is arranged between the upper and lower covers. The upper end of the screw is fixedly connected to the connecting seat, passes through the upper and lower covers, and the lower end of the screw protrudes from the lower side of the lower cover. A nut is screwed onto the lower end of the screw.

[0019] By adopting the above technical solution, when the connecting seat moves upward, it drives the screw to move upward. The upward movement of the screw pulls the lower cover upward through the nut. The upward movement of the lower cover compresses the spring between the upper and lower covers. After being compressed, the spring rebounds, pushing the lower cover downward and causing the connecting seat to tend to move downward, thus blocking the upward movement of the connecting seat and resetting it. The spring provides energy-dissipating buffering for the movement of the connecting seat. On the other hand, by adjusting the nut, the initial compression degree of the spring can be adjusted, thereby adjusting the strength of the energy-dissipating buffering.

[0020] Optionally, the portion of the tubing below the upper surface of the wellhead is an extension, and the extension has a through hole penetrating the tubing wall.

[0021] By adopting the above technical solution, the through hole connects the inside and outside of the tubing. The through hole facilitates better flow of slurry on the inside and outside of the extension. Based on this, when slurry cross-flow occurs, the slurry located outside the extension can flow more quickly to the inside of the extension and then enter the anti-cross-flow space.

[0022] Optionally, the inner wall of the tubing column is provided with multiple quick-setting treatment ports, and an internal channel is provided on the tubing column wall. The internal channel is arranged through the tubing column wall and is opened along the length of the tubing column. The quick-setting treatment ports are connected to the external supply equipment through the internal channel.

[0023] By adopting the above technical solution

[0024] Optionally, the bottom of the ring cover is integrally formed with an extension ring extending downward along the ring cover axis, and a ring groove is excavated around the wellhead of the well body to accommodate the extension ring.

[0025] By adopting the above technical solution, the external supply equipment can supply quick-setting agent and / or foaming agent, and the cement slurry between the bottom plane of the tubing string and the upper surface of the well body can be treated through the quick-setting treatment port, so that the cement slurry can solidify quickly and improve the stability of the wellhead.

[0026] Optionally, a drain hole is opened in the second space, which is arranged vertically to connect the second space with the first space.

[0027] By adopting the above technical solution, the slurry can be naturally discharged into the first space.

[0028] Optionally, the slurry inlet channel includes a slurry inlet, a first channel, a second channel, and a slurry outlet connected in series. The slurry inlet is located on the lower surface of the anti-slurry ring plug, the slurry outlet is located on the upper outer periphery of the anti-slurry ring plug, and the first channel and the second channel are evenly distributed in the anti-slurry ring plug.

[0029] Optionally, a heating layer is provided on the outer wall of the tubing.

[0030] By adopting the above technical solution, the heating layer can heat the corresponding part of the cement slurry, thereby increasing the curing speed of the cement slurry.

[0031] The beneficial effects of this invention are as follows: This device significantly improves the slurry anti-channeling and sealing effect by adding a tubing string between the wellhead and the wellbore. The top plane of the tubing string is higher than the upper surface of the wellhead, creating an anti-channeling space between the tubing string and the wellbore, located on the upper surface of the wellhead. This space can accommodate upward-flowing slurry, thereby reducing the impact on the annulus cap and slurry discharge pipe, further improving the sealing effect. In addition, the tubing string is also equipped with a quick-setting treatment port, which can effectively help the cement slurry at the wellhead to solidify quickly. Attached Figure Description

[0032] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the rapid solidification and anti-channeling sealing device for tubular cement slurry in this embodiment;

[0034] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0035] Explanation of reference numerals in the attached drawings: 1. Wellbore; 2. Ring cover; 21. Slurry discharge pipe; 22. Extension ring; 3. Tubing string; 31. Quick-setting treatment port; 32. Through hole; 4. Anti-channeling ring plug; 41. First space; 42. Second space; 43. Slurry inlet channel; 431. Slurry inlet; 432. First channel; 433. Second channel; 434. Slurry discharge port; 5. Connecting seat; 6. Energy dissipation component; 61. Upper cover; 62. Spring; 63. Lower cover; 64. Screw; 7. Ring groove. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] This invention provides a tubular type cement slurry rapid solidification and anti-channeling sealing device, referring to... Figure 1 , Figure 2 The tubular cement slurry rapid solidification and anti-channeling sealing device includes a wellbore 1, a ring cover 2, a tubular string 3, an anti-channeling ring plug 4, a connecting seat 5, and an energy-consuming component 6.

[0039] The bottom of the shaft 1 is located inside the well body, and the top is located above the wellhead of the well body. Cement slurry can be injected into the annulus between the well body and the shaft 1 through the shaft 1.

[0040] The ring cover 2 is laid flat on the upper surface of the wellhead of the well body to seal the wellhead. A slurry discharge pipe 21 is also fixedly connected to the ring cover 2, communicating with the annular space between the well body and the well casing 1. To improve the sealing effect of the ring cover 2, in this embodiment, an extension ring 22 extending downwards along the axial direction of the ring cover 2 is integrally formed at the bottom of the ring cover 2. An annular groove 7 is excavated around the wellhead of the well body to accommodate the extension ring 22. Slurry is injected between the annular groove 7 and the extension ring 22. In the prior art, slurry is often pre-sprayed onto the inner side of the wellhead to form a sealing structure and then connected to the ring cover 2. This method has certain construction difficulties and the firmness is hard to guarantee. In this embodiment, an annular groove 7 is excavated around the wellhead, which is more convenient and has lower construction difficulty. Slurry can then be directly injected into the annular groove 7.

[0041] The tubing string 3 is arranged between the well body and the well casing 1. The tubing string 3 is sleeved on the well casing 1, and there is a gap between the tubing string 3 and the well casing 1. The tubing string 3 passes through the ring cover 2 and is fixedly connected to the ring cover 2. The top plane of the tubing string 3 is higher than the upper surface of the well body wellhead, and the lower end is inserted below the well body wellhead, so that the space between the tubing string 3 and the well casing 1 and located on the upper surface of the well body wellhead forms an anti-channeling space.

[0042] Multiple quick-setting ports 31 are provided on the inner wall of the tubing string 3. An internal channel is also provided on the tubing string 3, extending through the tubing string 3 and running along its length. The quick-setting ports 31 are connected to an external supply device via the internal channel. The quick-setting ports 31 allow for the treatment of the cement slurry between the bottom plane of the tubing string 3 and the upper surface of the wellbore, enabling rapid solidification of this portion of the cement slurry and improving the stability of the wellhead. The external supply device supplies quick-setting agents and / or foaming agents. Adding an appropriate amount of quick-setting agent, such as aluminate, to the cement slurry can accelerate the solidification reaction and promote rapid hardening. It should be noted that the proportion of quick-setting agent added is generally 1-2% of the total weight of the cement slurry. Excessive addition will affect the compressive strength of the cement slurry. In this embodiment, the proportion of quick-setting agent added is 1-2% of the total weight of the cement slurry between the bottom plane of the tubing string 3 and the upper surface of the wellbore. By adding an appropriate amount of foaming agent, the air content in the cement slurry can be increased, thereby improving the curing speed of the cement slurry. The foaming agent can form uniform small bubbles, which in turn accelerates the coagulation reaction of the cement slurry and forms a denser structure.

[0043] The part of the tubing string 3 located below the upper surface of the wellhead is the extension, and the quick-setting treatment port 31 is distributed on the extension. The extension has the same tubing structure as the tubing string 3. The extension can also be optimized in terms of the tubing structure, so that the inner and outer sides of the tubing structure are reinforced with steel bars, which can form a steel cage. This configuration can achieve reinforcement of the wellhead structure.

[0044] A through-hole 32 is provided in the extension section, penetrating the wall of the tube column 3. The through-hole 32 connects the inside and outside of the tube column 3, facilitating better flow of grout between the inside and outside of the extension section. Based on this, when grout cross-flow occurs, the grout located outside the extension section can flow more quickly to the inside of the extension section and enter the anti-cross-flow space. The through-hole 32 can be a square hole, a round hole, a triangular hole, etc. A heating layer is provided on the outer wall of the tube column 3. The heating layer can be a resistance wire heating layer or an electromagnetic heating layer. The heating layer can heat the corresponding part of the cement grout, thereby improving the curing speed of the cement grout.

[0045] This device greatly improves the sealing effect against cement slurry leakage by adding a tubing string 3 between the well body and the well casing 1. The top plane of the tubing string 3 is higher than the upper surface of the wellhead, so that the space between the tubing string 3 and the well casing 1 and located on the upper surface of the wellhead forms an anti-slurry space. The anti-slurry space can accommodate the upward flow of slurry, reducing the impact on the ring cover 2 and the slurry discharge pipe 21, and thus also improving the sealing effect to a certain extent.

[0046] To improve the anti-surge effect of the anti-surge space, an anti-surge ring plug 4 is slidably installed between the tubing string 3 and the wellbore 1. The anti-surge ring plug 4 is located above the anti-surge space and restricts the anti-surge space below to form a first space 41. The height of the first space 41 is 20cm-40cm. By setting the anti-surge ring plug 4, the anti-surge space can be optimized to a certain extent, preventing slurry from leaking out of the device.

[0047] A connecting seat 5 is fixedly connected to the anti-slip ring plug 4, and the connecting seat 5 is positioned above the tubing column 3. The upper part of the outer periphery of the anti-slip ring plug 4 is stepped, and a second space 42 is formed between the anti-slip ring plug 4, the tubing column 3, and the connecting seat 5. A slurry inlet channel 43 is provided on the anti-slip ring plug 4, which connects the second space 42 with the first space 41. By configuring the second space 42 and the slurry inlet channel 43 connecting the first space 41 and the second space 42, secondary anti-slip can be achieved.

[0048] The slurry inlet channel 43 includes a slurry inlet 431, a first channel 432, a second channel 433, and a slurry outlet 434 connected in series. The slurry inlet 431 is located on the lower surface of the anti-slurry ring plug 4, and the slurry outlet 434 is located on the upper outer periphery of the anti-slurry ring plug 4. The first channel 432 and the second channel 433 are evenly distributed within the anti-slurry ring plug 4. When the slurry rises above the slurry inlet 431, it may push the anti-slurry ring plug 4 upwards and be blocked by the connecting seat 5. Alternatively, the slurry may enter the second space 42 through the slurry inlet channel 43, thus achieving secondary anti-slurry. A drain hole can also be opened in the second space 42, arranged vertically to connect the second space 42 with the first space 41, allowing the slurry to be naturally discharged into the first space 41.

[0049] To further prevent the anti-slip ring plug 4 from moving upward, a buffer assembly is installed on the tubing 3 to buffer the connecting seat 5. The buffer assembly is used to block the connecting seat 5 and reset the upward-moving connecting seat 5.

[0050] The buffer assembly includes an upper cover 61, a spring 62, a lower cover 63, and a screw 64. The upper cover 61 is fixedly connected to the column 3 and to its outer wall. The upper end of the spring 62 is fixedly connected to the upper cover 61, and the lower end is fixedly connected to the upper surface of the lower cover 63. The upper cover 61 and the lower cover 63 are arranged in parallel, and the spring 62 is positioned between them. The upper end of the screw 64 is fixedly connected to the connecting seat 5, passes through the upper cover 61 and the lower cover 63, and the lower end of the screw 64 protrudes from the underside of the lower cover 63. A nut is screwed onto the lower end of the screw 64. When the connecting seat 5 moves upward, it drives the screw 64 upward. The upward movement of the screw 64 pulls the lower cover 63 upward through the nut. The upward movement of the lower cover 63 compresses the spring 62 between the upper cover 61 and the lower cover 63. After being compressed, the spring 62 provides a rebound, pushing the lower cover 63 downward and causing the connecting seat 5 to tend to move downward, thus blocking the upward movement of the connecting seat 5 and resetting it. The spring 62 provides energy-dissipating buffer for the movement of the connecting seat 5. On the other hand, the initial compression degree of the spring 62 can be adjusted by adjusting the nut, thereby adjusting the strength of the energy-dissipating buffer.

[0051] The advantages of the tubing-type cement slurry rapid solidification and anti-channeling sealing device disclosed in this application embodiment are: by adding a tubing string 3 between the well body and the wellbore 1, the anti-channeling sealing effect of the slurry is greatly improved. The top plane of the tubing string 3 is higher than the upper surface of the wellhead, so that the space between the tubing string 3 and the wellbore 1, located on the upper surface of the wellhead, forms an anti-channeling space. The anti-channeling space can accommodate the upward-flowing slurry, thereby reducing the impact on the ring cover 2 and the slurry discharge pipe 21, and further improving the sealing effect. In addition, the tubing string 3 is also provided with a rapid solidification treatment port 31, which can effectively help the cement slurry at the wellhead to solidify quickly.

[0052] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0053] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A tubular type cement slurry rapid solidification and anti-channeling sealing device, characterized in that: It includes a wellbore (1), a ring cover (2), a tubing string (3), and an anti-slip ring plug (4); The bottom of the wellbore (1) is located inside the well body, and the top is located above the wellhead of the well body; The ring cover (2) is laid flat on the upper surface of the wellhead of the well body to seal the wellhead. A slurry pipe (21) is also fixedly connected to the ring cover (2). The slurry pipe (21) is connected to the annulus between the well body and the well barrel (1). The tubing string (3) is arranged between the well body and the well casing (1). The tubing string (3) is sleeved on the well casing (1) and there is a gap between it and the well casing (1). The tubing string (3) passes through the ring cover (2) and is fixedly connected to the ring cover (2). The top plane of the tubing string (3) is higher than the upper surface of the well body wellhead, and the lower end is inserted below the well body wellhead, so that the space between the tubing string (3) and the well casing (1) and located on the upper surface of the well body wellhead forms an anti-channeling space. An anti-slip ring plug (4) is slidably installed between the tubing string (3) and the wellbore (1), and the anti-slip ring plug (4) is located above the anti-slip space.

2. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: The anti-slip ring plug (4) is fixedly connected to a connecting seat (5), which is positioned above the column (3).

3. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 2, characterized in that: The upper part of the outer periphery of the anti-slip ring plug (4) is set in a stepped shape; the anti-slip ring plug (4) forms a second space (42) with the tube column (3) and the connecting seat (5); the anti-slip ring plug (4) is located above the anti-slip space and restricts the anti-slip space below to form a first space (41). The anti-slip ring plug (4) has a slurry inlet channel (43) which connects the second space (42) with the first space (41).

4. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: The tubular column (3) is equipped with a buffer assembly for buffering the connecting seat (5); The buffer assembly includes an upper cover (61), a spring (62), a lower cover (63), and a screw (64); the upper cover (61) is fixedly connected to the column (3) and to the outer wall of the column (3); the upper end of the spring (62) is fixedly connected to the upper cover (61), and the lower end is fixedly connected to the upper surface of the lower cover (63). The upper cover (61) and the lower cover (63) are arranged in parallel, and the spring (62) is arranged between the upper cover (61) and the lower cover (63); the upper end of the screw (64) is fixedly connected to the connecting seat (5), passes through the upper cover (61) and the lower cover (63), and the lower end of the screw (64) protrudes from the lower side of the lower cover (63). A nut is screwed onto the lower end of the screw (64).

5. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: The portion of the tubing string (3) below the upper surface of the wellhead is an extension, and a through hole (32) is provided on the extension to penetrate the wall of the tubing string (3).

6. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: Multiple quick-setting treatment ports (31) are provided on the inner wall of the tube column (3). An internal channel is provided on the tube wall of the tube column (3). The internal channel is arranged through the tube wall of the tube column (3) and is opened along the length of the tube column (3). The quick-setting treatment ports (31) are connected to the external supply equipment through the internal channel.

7. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: The bottom of the ring cover (2) is integrally formed with an extension ring (22) extending downward along the axial direction of the ring cover (2), and a ring groove (7) is dug around the wellhead of the well body to accommodate the extension ring (22).

8. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 3, characterized in that: A drain hole is opened in the second space (42), and the drain hole is arranged vertically to connect the second space (42) with the first space (41).

9. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 3, characterized in that: The slurry inlet channel (43) includes a slurry inlet (431), a first channel (432), a second channel (433), and a slurry outlet (434) connected in series. The slurry inlet (431) is located on the lower surface of the anti-slip ring plug (4), and the slurry outlet (434) is located on the upper outer periphery of the anti-slip ring plug (4). The first channel (432) and the second channel (433) are evenly distributed in the anti-slip ring plug (4).

10. The tubing-type cement slurry rapid solidification and anti-channeling sealing device according to claim 1, characterized in that: The outer wall of the tube column (3) is provided with a heating layer.

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