A cannula guard

Abstract

The application discloses a casing protection device, which comprises an inner protection tube, an adjusting mechanism, a protection bag and an outer protection tube; the adjusting mechanism comprises a plurality of first rotating blocks and a plurality of second rotating blocks; the protection bag comprises a plurality of vertical bag bodies which are communicated with each other; and the outer protection tube is sleeved outside the protection bag. The casing protection device has the beneficial effects that when the protection bag is extruded, A liquid in the protection bag is extruded into the branch bag bodies, the branch bag bodies increase the included angle between each first rotating block and the corresponding second rotating block, thereby the B liquid in the outer protection tube is compressed to increase the pressure in the outer protection tube, and finally, when the protection bag is extruded and broken, the B glue in the vertical bag bodies flows into the annular cavity and is mixed with the original A glue in the annular cavity to solidify and form a glue body with certain buffering capacity, the glue body is filled between the inner protection tube and the outer protection tube and serves as the last barrier for protecting the casing, so that the casing protection device can improve the casing protection effect through multiple protections.

Description

Technical Field

[0001] This invention relates to the field of sleeve protection technology, and in particular to a sleeve protection device. Background Technology

[0002] my country has enormous potential for deep shale gas resources (approximately 11.3 × 10⁻⁶). 12 m 3 Shale gas is an important successor area for future exploration and development. Shale reservoirs deeper than 3500m have more complex geological structures, higher temperatures (above 150℃), higher in-situ stress, and greater horizontal stress differences. Deep shale exists in a unique geological environment of high temperature, high in-situ stress, and high fracture pressure, resulting in significantly different rock mechanical properties compared to shallower shale, particularly in reduced rock brittleness and more pronounced nonlinear fracture characteristics. This objectively hinders the formation of artificially complex fracture networks.

[0003] Because natural fracture zones are concentrated in certain areas and their spatial distribution is complex, there are currently no effective means to accurately identify and locate them. During fracturing, casing deformation and frequent fracture channeling are likely to occur, which seriously affects the fracturing process and development effect of deep shale gas wells.

[0004] Regarding the mechanism of casing deformation, domestic and international scholars have mostly explored and studied it from an engineering perspective, such as alternating temperature loads in the wellbore during fracturing, cementing quality, and the casing-cement sheath-formation aspects. However, recent evidence increasingly suggests that casing deformation mainly occurs during the fracturing process, and shear slippage of natural fractures / faults during multi-stage fracturing may be the main inducing factor for casing deformation. In deep shale fracturing, high pump pressure, frequent pump pressure loading and unloading processes, and numerous clusters with small spacing make the geological conditions of the casing more complex and severe, further exacerbating the casing deformation process.

[0005] A search revealed that there is currently no literature on the installation of protective devices for casing deformation. Casing deformation is characterized by its suddenness and randomness, making it difficult to predict. With the continued development of the shale gas industry, improving the casing's resistance to deformation is an urgent technical challenge that needs to be addressed. Summary of the Invention

[0006] In view of this, it is necessary to provide a casing protection device to improve the casing's resistance to deformation.

[0007] To achieve the above objectives, the present invention provides a sleeve protection device, comprising an inner protective tube, an adjustment mechanism, a protective bladder, and an outer protective tube;

[0008] The adjustment mechanism includes a plurality of first rotating blocks and a plurality of second rotating blocks. Each first rotating block is evenly arranged on the outer side wall of the inner protective tube. One side of each first rotating block is hinged to the outer side wall of the inner protective tube. Each first rotating block has a plurality of first insertion holes. Each second rotating block is evenly arranged on the outer side wall of the inner protective tube. One side of each second rotating block is hinged to the outer side wall of the inner protective tube. The other side of each second rotating block is hinged to the other side of the corresponding first rotating block. Each second rotating block has a plurality of second insertion holes.

[0009] The protective bag includes several interconnected vertical bags, each of which is filled with A-type adhesive. Each vertical bag is positioned between two adjacent rotating blocks. Each vertical bag has several support bags fixed on it, corresponding to each of the first and second insertion holes. Each support bag is connected to the corresponding vertical bag and is used to be inserted into the corresponding first and second insertion holes.

[0010] The outer protective tube is sleeved over the protective bag, and a closed annular cavity is formed between the outer protective tube and the rotating block. The annular cavity is used to fill with B glue.

[0011] The components of Glue A are: 90% resin + 5% plasticizer + 5% sodium bicarbonate, and the components of Glue B are: 50% curing agent + 30% filler + 10% diluent + 10% acetic acid.

[0012] In some embodiments, the protective bag further includes an upper bag body, which is connected to the upper end of each of the vertical bags.

[0013] In some embodiments, the upper bladder is provided with a first infusion port, and the first infusion port is covered with a first cap.

[0014] In some embodiments, the protective bag further includes a lower bag body, which is connected to the lower end of each of the vertical bags.

[0015] In some embodiments, the sleeve protection device further includes an upper end plate, wherein the upper end plate is sealed and fixedly connected to the upper end surfaces of the inner protective tube and the outer protective tube.

[0016] In some embodiments, the upper end plate has a second injection port communicating with the annular cavity, and the second injection port is covered with a second cover.

[0017] In some embodiments, the sleeve protection device further includes a lower end plate, wherein the lower end plate is sealed and fixedly connected to the lower end faces of the inner protective tube and the outer protective tube.

[0018] In some embodiments, the adjustment mechanism further includes a plurality of first sealing strips, which are disposed at the hinge joint between the corresponding first rotating block and the outer wall of the inner protective tube.

[0019] In some embodiments, the adjustment mechanism further includes a plurality of second sealing strips, which are disposed at the hinge joint between the corresponding second rotating block and the outer wall of the inner protective tube.

[0020] In some embodiments, a main tube is fixed along the length of the vertical bladder body, and a plurality of connection ports are provided on the main tube, with each branch bladder body communicating with the corresponding connection port.

[0021] Compared with the prior art, the beneficial effects of the technical solution proposed in this invention are as follows: By setting an adjustment mechanism and a protective bladder between the inner and outer protective tubes, the protective bladder can improve the deformation resistance of the outer protective tube through buffering. At the same time, when the protective bladder is squeezed, the A liquid inside the protective bladder is squeezed into the support bladder. The support bladder increases the angle between each first rotating block and the corresponding second rotating block, thereby compressing the B liquid inside the outer protective tube to increase the internal pressure of the outer protective tube, thereby further improving the deformation resistance of the outer protective tube. Finally, when the protective bladder is ruptured, the B glue in the vertical bladder will flow into the annular cavity and mix with the original A glue in the annular cavity and solidify to form a colloid with a certain buffering capacity. The colloid fills the space between the inner and outer protective tubes, serving as the last barrier to protect the sleeve. Thus, this device can improve the sleeve protection effect through multiple protections. In addition, this invention designs a unique formula for the A and B glues, which generates a large amount of carbon dioxide gas when mixed, causing the formed colloid to expand, further improving the support effect of the outer protective tube and enhancing the deformation resistance of the outer protective tube. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the sleeve protection device provided by the present invention;

[0023] Figure 2 yes Figure 1 A sectional view of the casing protection device (all second rotating blocks are omitted);

[0024] Figure 3 yes Figure 1 Exploded view (inner protective tube omitted);

[0025] Figure 4 yes Figure 3 A three-dimensional structural diagram of the protective bladder;

[0026] Figure 5 yes Figure 3 A three-dimensional structural diagram of the adjustment mechanism in the middle;

[0027] Figure 6 yes Figure 1 Top view;

[0028] Figure 7 yes Figure 6 Sectional view of the central region AA;

[0029] Figure 8 yes Figure 7 Cross-sectional view of the central region BB (after each cyst body has been squeezed with A glue);

[0030] Figure 9 yes Figure 7 Cross-sectional view of the central region BB (before each cyst is squeezed into A glue);

[0031] In the figure: 1-Inner protective tube, 2-Adjusting mechanism, 21-First rotating block, 211-First insertion hole, 22-Second rotating block, 221-Second insertion hole, 23-First sealing strip, 24-Second sealing strip, 25-Third sealing strip, 3-Protective bladder, 31-Vertical bladder body, 311-Main tube, 32-Support bladder body, 33-Upper bladder body, 331-First filling port, 34-Lower bladder body, 4-Outer protective tube, 5-Upper end plate, 51-Second filling port, 6-Lower end plate. Detailed Implementation

[0032] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Please refer to Figures 1-9 The present invention provides a sleeve protection device, including an inner protective tube 1, an adjustment mechanism 2, a protective bladder 3 and an outer protective tube 4;

[0034] The adjustment mechanism 2 includes several first rotating blocks 21 and several second rotating blocks 22. Each first rotating block 21 is evenly arranged on the outer wall of the inner protective tube 1. One side of each first rotating block 21 is hinged to the outer wall of the inner protective tube 1. Each first rotating block 21 has several first insertion holes 211. Each second rotating block 22 is evenly arranged on the outer wall of the inner protective tube 1. One side of each second rotating block 22 is hinged to the outer wall of the inner protective tube 1. The other side of each second rotating block 22 is hinged to the other side of the corresponding first rotating block 21. Each second rotating block 22 has several second insertion holes 221. In this embodiment, each first rotating block 21 and each second rotating block 22 has a certain bending deformation capability.

[0035] The protective bag 3 includes several interconnected vertical bags 31. Each vertical bag 31 is filled with A-type adhesive. Each vertical bag 31 is disposed between two adjacent rotating blocks 21. Each vertical bag 31 is fixed with several support bags 32 corresponding to each of the first insertion holes 211 and the second insertion holes 221. Each support bag 32 is connected to the corresponding vertical bag 31 and is used to be inserted into the corresponding first insertion hole 211 and the second insertion hole 221.

[0036] The outer protective tube 4 is sleeved outside the protective bladder 3, and a sealed annular cavity is formed between the outer protective tube 4 and the rotating block 21. The annular cavity is used to fill with B glue.

[0037] In this embodiment, the composition of adhesive A is: 90% resin + 5% plasticizer + 5% sodium bicarbonate, and the composition of adhesive B is: 50% curing agent + 30% filler + 10% diluent + 10% acetic acid. When the two are mixed, sodium bicarbonate reacts with acetic acid to generate carbon dioxide gas. The generation of carbon dioxide gas will cause a large number of pores to be generated inside the formed adhesive, thereby increasing the volume of the formed adhesive to better support the outer protective tube 4 and improve the deformation resistance of the outer protective tube 4.

[0038] In use, the depth at which casing deformation is likely to occur is first determined based on data such as the wellbore formation column. Then, the casing protection device is fixedly fitted onto the casing near the corresponding depth and lowered into the wellbore. Cementing is then performed. When shear slip or other events occur in the downhole formation, the outer protective tube 4 will first be compressed and deformed. This deformation acts on each vertical capsule 31, causing the capsule 31 on the stressed side to be crushed. The A-grade adhesive inside will then enter each branch capsule 32. When each branch capsule 32 is filled with A-grade adhesive, it will tighten, thereby increasing the angle between each first rotating block 21 and the corresponding second rotating block 22 (approaching 180°). During this process, the first rotating block 21 and the second rotating block 22... The tube will bend appropriately, reducing the volume of the annular cavity, while the amount of B-type adhesive inside the annular cavity remains constant. This increases the pressure inside the annular cavity, thereby increasing the pressure on the inner wall of the outer protective tube 4. This pressure counteracts the pressure on the outside of the outer protective tube 4, improving its resistance to deformation. If the external pressure increases further, and the deformation of the outer protective tube 4 increases further, the outer protective tube 4 will crush the vertical bladder 31. The B-type adhesive inside the vertical bladder 31 will flow into the annular cavity and mix with the original A-type adhesive inside the annular cavity before solidifying, forming an adhesive with a certain buffering capacity. This adhesive fills the space between the inner protective tube 1 and the outer protective tube 4, serving as the last barrier to protect the casing.

[0039] The sleeve protection device provided by this invention, by setting an adjustment mechanism 2 and a protective bladder 3 between the inner protective tube 1 and the outer protective tube 4, enhances the deformation resistance of the outer protective tube 4 through a buffering effect. Simultaneously, when the protective bladder 3 is squeezed, liquid A inside the protective bladder 3 is forced into the support bladder body 32. The support bladder body 32 increases the angle between each first rotating block 21 and the corresponding second rotating block 22, thereby compressing liquid B inside the outer protective tube 4, increasing the internal pressure of the outer protective tube 4, and further improving the deformation resistance of the outer protective tube 4. Finally, when the protective bladder 3 is ruptured... At this time, the B-type adhesive inside the vertical bladder 31 flows into the annular cavity and mixes with the original A-type adhesive in the annular cavity before solidifying to form an adhesive with a certain buffering capacity. The adhesive fills the space between the inner protective tube 1 and the outer protective tube 4, serving as the last barrier to protect the sleeve. Thus, this device can improve the sleeve protection effect through multiple protections. In addition, this invention designs a unique formula for the A-type and B-type adhesives, which generates a large amount of carbon dioxide gas when mixed, causing the formed adhesive to expand and further improving the support effect of the outer protective tube 4 and enhancing the deformation resistance of the outer protective tube 4.

[0040] To specifically achieve the connectivity of each of the vertical capsules 31, please refer to... Figures 1-4 In a preferred embodiment, the protective bag 3 further includes an upper bag body 33, which is connected to the upper end of each of the vertical bags 31.

[0041] To facilitate the insertion of A-type adhesive into the protective bladder 3, please refer to... Figures 1-4 In a preferred embodiment, the upper bladder 33 is provided with a first infusion port 331, and a first cover (not shown) is provided on the first infusion port 331. When it is necessary to inject A glue, the first cover is opened, A glue is injected, and then the first cover is closed again.

[0042] 4-1 To improve the connectivity of each of the vertical capsules 31, please refer to... Figures 1-4 In a preferred embodiment, the protective bladder 3 further includes a lower bladder body 34, which is connected to the lower end of each of the vertical bladder bodies 31.

[0043] To specifically achieve the closure of the annular cavity, please refer to... Figures 1-4 In a preferred embodiment, the sleeve protection device further includes an upper end plate 5, which is sealed and fixedly connected to the upper end surfaces of the inner protective tube 1 and the outer protective tube 4.

[0044] To illustrate how to inject glue B into the annular cavity, please refer to [the instructions]. Figures 1-4In a preferred embodiment, the upper end plate 5 is provided with a second injection port 51 that communicates with the annular cavity. The second injection port 51 is covered with a second cover (not shown). When it is necessary to inject B glue, the second cover is opened, B glue is injected, and then the second cover is closed.

[0045] To specifically achieve the closure of the annular cavity, please refer to... Figures 1-4 In a preferred embodiment, the sleeve protection device further includes a lower end plate 6, and the lower end plate 6 is sealed and fixedly connected to the lower end faces of the inner protective tube 1 and the outer protective tube 4.

[0046] To improve the sealing of the hinge joint between the first rotating block 21 and the outer wall of the inner protective tube 1, please refer to... Figures 1-4 In a preferred embodiment, the adjustment mechanism 2 further includes a plurality of first sealing strips 23, which are inserted at the hinge joint between the corresponding first rotating block 21 and the outer wall of the inner protective tube 1.

[0047] To improve the sealing of the hinge joint between the second rotating block 22 and the outer wall of the inner protective tube 1, please refer to... Figures 1-4 In a preferred embodiment, the adjustment mechanism 2 further includes a plurality of second sealing strips 24, which are inserted at the hinge between the corresponding second rotating block 22 and the outer wall of the inner protective tube 1.

[0048] To improve the sealing at the hinge between the other side of the second rotating block 22 and the corresponding other side of the first rotating block 21, please refer to... Figures 3-5 In a preferred embodiment, the adjustment mechanism 2 further includes a plurality of third sealing strips 25, which are inserted at the hinge between the other side of the second rotating block 22 and the corresponding other side of the first rotating block 21.

[0049] To specifically achieve the connection between each branch cyst 32 and its corresponding vertical cyst 31, please refer to... Figure 4 In a preferred embodiment, a main tube 311 is fixed along the length direction on the vertical bladder body 31, and the main tube 311 is provided with a plurality of connection ports, and each of the branch bladder bodies 32 is connected to the corresponding connection port.

[0050] To better understand this invention, the following is combined with... Figures 1-9The working process of the casing protection device provided by this invention will be described in detail below: In use, firstly, the depth at which casing deformation is likely to occur is determined based on data such as the wellbore formation columnar section. Then, the casing protection device is fixedly fitted onto the casing near the corresponding depth and lowered into the wellbore. After cementing, when shear slip or other events occur in the downhole formation, the outer protective tube 4 will first be compressed and deformed. After deformation, the outer protective tube 4 acts on each vertical bladder 31, causing the bladder 31 on the stressed side to be crushed. The A-grade adhesive inside will then enter each branch bladder 32. When each branch bladder 32 is filled with A-grade adhesive, it will tighten, causing each rotating block 21 to rotate towards the outer protective tube 4, thereby reducing the volume of the annular cavity. Since the amount of B-grade adhesive in the annular cavity remains constant, this increases the pressure within the annular cavity, thus causing the outer protective tube to... The increased pressure on the inner wall of tube 4 counteracts the pressure on the outside of the outer protective tube 4, thereby improving the deformation resistance of the outer protective tube 4. If the external pressure increases further, the deformation of the outer protective tube 4 will further increase, causing the outer protective tube 4 to crush the vertical bladder 31. The B-type adhesive inside the vertical bladder 31 will flow into the annular cavity and mix with the original A-type adhesive in the annular cavity before solidifying, forming an adhesive with a certain buffering capacity. The adhesive fills the space between the inner protective tube 1 and the outer protective tube 4, serving as the last barrier to protect the sleeve. In addition, this invention designs a unique formula for the A-type and B-type adhesives, which generates a large amount of carbon dioxide gas when mixed, causing the volume of the formed adhesive to expand, further improving the support effect on the outer protective tube 4 and enhancing its deformation resistance.

[0051] The sleeve protection device provided by this invention sets an adjustment mechanism 2 and a protective bladder 3 between the inner protective tube 1 and the outer protective tube 4. The protective bladder 3 can improve the deformation resistance of the outer protective tube 4 through buffering. At the same time, when the protective bladder 3 is squeezed, the A liquid in the protective bladder 3 is squeezed into the support bladder body 32. The support bladder body 32 drives each rotating block 21 to rotate outward, thereby compressing the B liquid in the outer protective tube 4 to increase the internal pressure of the outer protective tube 4, thereby further improving the deformation resistance of the outer protective tube 4. Finally, when the protective bladder 3 is ruptured, the B glue in the vertical bladder body 31 will flow into the annular cavity and mix with the original A glue in the annular cavity and solidify to form a colloid with a certain buffering capacity. The colloid fills the space between the inner protective tube 1 and the outer protective tube 4, serving as the last barrier to protect the sleeve. Thus, this device can improve the sleeve protection effect through multiple protections.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A cannula guard device, characterized in that, Includes an inner protective tube, an adjustment mechanism, a protective bladder, and an outer protective tube; The adjustment mechanism includes a plurality of first rotating blocks and a plurality of second rotating blocks. Each first rotating block is evenly arranged on the outer side wall of the inner protective tube. One side of each first rotating block is hinged to the outer side wall of the inner protective tube. Each first rotating block has a plurality of first insertion holes. Each second rotating block is evenly arranged on the outer side wall of the inner protective tube. One side of each second rotating block is hinged to the outer side wall of the inner protective tube. The other side of each second rotating block is hinged to the other side of the corresponding first rotating block. Each second rotating block has a plurality of second insertion holes. The protective bag includes several interconnected vertical bags, each of which is filled with A-type adhesive. Each vertical bag is positioned between two adjacent rotating blocks. Each vertical bag has several support bags fixed on it, corresponding to each of the first and second insertion holes. Each support bag is connected to the corresponding vertical bag and is used to be inserted into the corresponding first and second insertion holes. The outer protective tube is sleeved over the protective bag, and a closed annular cavity is formed between the outer protective tube and the rotating block. The annular cavity is used to fill with B glue. The components of Glue A are: 90% resin + 5% plasticizer + 5% sodium bicarbonate, and the components of Glue B are: 50% curing agent + 30% filler + 10% diluent + 10% acetic acid.

2. The cannula guard device of claim 1, wherein, The protective bag also includes an upper bag body, which is connected to the upper end of each of the vertical bags.

3. The cannula safeguard of claim 2, wherein, The upper bladder is provided with a first infusion port, and the first infusion port is covered with a first cap.

4. The cannula safeguard of claim 1, wherein, The protective bag also includes a lower bag body, which is connected to the lower end of each of the vertical bags.

5. The cannula safeguard of claim 1, wherein, The sleeve protection device also includes an upper end plate, which is sealed and fixedly connected to the upper end surfaces of the inner and outer protective tubes.

6. The cannula safeguard of claim 5, wherein, The upper end plate has a second injection port that communicates with the annular cavity, and the second injection port is covered with a second cover.

7. The cannula safeguard of claim 1, wherein The sleeve protection device also includes a lower end plate, which is sealed and fixedly connected to the lower end face of the inner protective tube and the outer protective tube.

8. The cannula safeguard of claim 1, wherein, The adjustment mechanism also includes several first sealing strips, which are inserted at the hinge between the corresponding first rotating block and the outer wall of the inner protective tube.

9. The cannula safeguard of claim 1, wherein, The adjustment mechanism also includes several second sealing strips, which are inserted at the hinge between the corresponding second rotating block and the outer wall of the inner protective tube.

10. The cannula safeguard of claim 1, wherein, A main tube is fixed along the length of the vertical bladder body, and several connection ports are opened on the main tube, with each branch bladder body communicating with the corresponding connection port.

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