Self-expanding double-cone type shot hole temporary plugging agent

Abstract

The invention provides a self-expanding double-cone type shot hole temporary plugging agent. The self-expanding double-cone type shot hole temporary plugging agent structurally comprises a cylinder and two cone structures, and the two bottom faces of the cylinder coincide with the bottom faces of the two cone structures respectively; each of the cylinder and the two cone structures independently comprises an outer layer shell, a middle layer and an inner layer from outside to inside; the inner layer of the two cone structures is cone-shaped, the inner layer comprises metal alloy, the middle layer comprises thermal expansion resin and a curing agent, and the outer layer shell comprises rubber. The self-expanding double-cone type shot hole temporary plugging agent is fed from a surface pipeline, and the hole is plugged by using the conical structure of the self-expanding double-cone type shot hole temporary plugging agent after the self-expanding double-cone type shot hole temporary plugging agent reaches a stratum hole plugging position. And the temporary plugging agent expands to completely plug the abraded irregular holes. And particularly, the perforation cluster which is seriously abraded can be effectively blocked, so that the effectiveness of the perforation cluster is improved, the balanced expansion of the perforation cluster is promoted, the fracturing transformation volume is increased, and the post-fracturing capacity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of reservoir transformation, in particular to a self-expanding double-cone blasthole temporary plugging agent. Background Art

[0002] In recent years, after continuous research, the Changqing tight gas horizontal well has formed a horizontal well segmented multi-cluster transformation technology with cementing completion bridge plug segmented fracturing as the main body. Temporary plugging agents are used to perform graded fracturing on the blastholes in the segment to improve the effectiveness of clustering. At present, in the process of plugging blastholes with temporary plugging agents, the following problems still exist: ① The perforations are severely eroded after fracturing, and the rigid temporary plugging agent has poor plugging performance for irregular blastholes; ② From the test results of the gas production profile of the Changqing tight gas horizontal well, there are still many perforation clusters that fail to fracture after temporary plugging with flexible temporary plugging agents, and the blasthole temporary plugging process still needs to be further optimized.

[0003] In order to solve the above problems, a self-expanding double-conical blasthole temporary plugging agent that can effectively plug irregular holes was invented. According to the survey, the temporary plugging agents commonly used in the temporary plugging process of blastholes are divided into three categories: temporary plugging balls, fiber temporary plugging agents, and knot temporary plugging agents. In the Chinese patent applications with patent application publication numbers CN114958321A, CN114752368A, and CN114458233A, a temporary plugging ball is provided. However, regular perforated holes are eroded into irregular holes after fracturing. The temporary plugging ball is a rigid temporary plugging agent and has poor sealing performance for irregular holes. In the Chinese patent applications with patent application publication numbers CN110344132A, CN103694976A, and CN105385430A, a fiber temporary plugging agent is provided. However, the fiber temporary plugging agent is easy to get entangled in the pipeline during the filling process, and has high requirements for filling, and even requires special filling equipment, which is not convenient for on-site construction in the oil field; Chinese patent applications with patent application publication numbers CN114921238A, CN115109572A, and CN113445979A all provide a knot temporary plugging agent, but the application effect in the Changqing tight gas horizontal well is not ideal. Judging from the test results of the gas production profile, there are still many perforation clusters that have not achieved fracture initiation. Summary of the invention

[0004] The main purpose of the present invention is to provide a self-expanding double-cone blasthole temporary plugging agent to solve the problem that the blasthole temporary plugging agent in the prior art has a poor blasthole temporary plugging effect.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a self-expanding double-conical blasthole temporary plugging agent, the structure of which includes a cylinder and two conical structures, wherein the two bottom surfaces of the cylinder coincide with the bottom surfaces of the two conical structures respectively; the cylinder and the two conical structures independently include an outer shell, a middle layer and an inner layer from the outside to the inside; the inner layers of the two conical structures are cone-shaped, the inner layer includes a metal alloy, the middle layer includes a thermal expansion resin and a curing agent, and the outer shell includes rubber.

[0006] Furthermore, the difference (Da-Dp) between the outer diameter Da of the bottom surface of the cylinder and the diameter Dp of the perforation hole before fracturing is ≥2 mm.

[0007] Furthermore, the distance L1 between the vertices of the two cone structures is (1.63-1.68) Da.

[0008] Furthermore, the height L2 of the cylinder is equal to (0.15-0.2) L1.

[0009] Furthermore, the metal alloy comprises, by mass percentage, 12.0-18.0% Al, 2.0-10.0% Cu, 2.0-3.6% Zn, 1.5-3.3% Ni, 0.01-8.0% In, and the rest being Mg and a small amount of impurities.

[0010] Furthermore, the metal alloy is dissolved in an aqueous solution at 50 to 120° C. after 10 to 30 hours.

[0011] Furthermore, the thickness of the intermediate layer is ≥2 mm, and the heat-expandable resin preferably expands at 50-120° C. after 5-30 minutes; the heat-expandable resin preferably dissolves in an aqueous solution after 8-36 hours; and the heat-expandable resin is preferably selected from any one or more of epoxy resin, unsaturated polyester resin, and acrylic resin.

[0012] Furthermore, the thickness of the outer shell is ≥2 mm, and the rubber is preferably dissolved in an aqueous solution at 50 to 120° C. after 10 to 30 hours; and the rubber is preferably polyurethane rubber.

[0013] Furthermore, when the temperature of the reservoir of the oil well section is 80°C≤≤120°C and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:10-25; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:40-50.

[0014] Furthermore, when the temperature of the reservoir of the oil well section is 50°C≤80°C and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:25-40; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:50-60.

[0015] By applying the technical solution of the present application, the above self-expanding double-cone blasthole temporary plugging agent of the present application is put into the ground pipeline, and after reaching the formation plugging hole position, it uses its conical structure to plug the hole. Furthermore, the temporary plugging agent expands and completely plugs the irregular holes after abrasion. In particular, it can effectively plug the perforation clusters with severe abrasion, thereby improving the effectiveness of the perforation clusters, promoting the balanced expansion of the perforation clusters, increasing the fracturing transformation volume, and improving the post-fracturing production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a self-expanding double-cone blasthole temporary plugging agent provided according to Example 1 of the present invention is shown.

[0018] The above drawings include the following reference numerals:

[0019] 1. Outer shell; 2. Middle layer; 3. Inner layer. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] As analyzed in the background technology of the present application, the blasthole temporary plugging agent in the prior art has the problem of poor blasthole temporary plugging effect. In order to solve this problem, the present application provides a self-expanding double-conical blasthole temporary plugging agent.

[0022] In a typical embodiment of the present application, a self-expanding double-cone blasthole temporary plugging agent is provided, such as Figure 1 As shown, the structure of the self-expanding double-conical blasthole temporary plugging agent includes a cylinder and two conical structures, wherein the two bottom surfaces of the cylinder coincide with the bottom surfaces of the two conical structures respectively; the cylinder and the two conical structures independently include an outer shell 1, a middle layer 2 and an inner layer 3 from the outside to the inside; the inner layer 3 of the two conical structures is cone-shaped, the inner layer 3 includes a metal alloy, the middle layer 2 includes a thermal expansion resin and a curing agent, and the outer shell 1 includes rubber.

[0023] The above self-expanding double-cone blasthole temporary plugging agent of the present application is put into the ground pipeline, and after reaching the formation plugging hole position, it uses its conical structure to plug the hole. Furthermore, the temporary plugging agent expands and completely plugs the irregular holes after abrasion. In particular, it can effectively plug the perforation clusters with severe abrasion, thereby improving the effectiveness of the perforation clusters, promoting the balanced expansion of the perforation clusters, increasing the fracturing transformation volume, and improving the post-fracturing production capacity.

[0024] In one embodiment of the present application, the difference (Da-Dp) between the outer diameter Da of the bottom surface of the cylinder and the diameter Dp of the perforation hole before fracturing is ≥2 mm.

[0025] The present application utilizes the unique cone structure at both ends of the self-expanding double-cone blasthole temporary plugging agent to fully ensure the initial plugging of the hole. The preferred (Da-Dp) value will not cause the self-expanding double-cone blasthole temporary plugging agent to fall directly into the hole, thereby helping to maintain the self-expanding double-cone blasthole temporary plugging agent's sufficient and stable plugging of the hole.

[0026] In one embodiment of the present application, the distance L1 between the vertices of the two cone structures is (1.63-1.68) Da.

[0027] The preferred L1 value is conducive to controlling the relative size relationship between the distance between the vertices of the two conical structures and the outer diameter Da of the bottom surface of the cylinder, so that the self-expanding double-conical blasthole temporary plugging agent can not only achieve initial plugging of the perforation, but also maintain the self-expanding double-conical blasthole temporary plugging agent with a suitable plugging volume inside and outside the perforation, thereby improving the effectiveness of the perforation cluster.

[0028] In one embodiment of the present application, the height L2 of the cylinder is (0.15-0.2) L1.

[0029] The cylinder in the middle is conducive to optimizing the flow state of the self-expanding double-cone type blasthole temporary plugging agent, thereby facilitating the cone structures at both ends of the temporary plugging agent to enter the blasthole.

[0030] In one embodiment of the present application, the metal alloy comprises, by mass percentage, 12.0-18.0% Al, 2.0-10.0% Cu, 2.0-3.6% Zn, 1.5-3.3% Ni, 0.01-8.0% In, and the rest is Mg and a small amount of impurities.

[0031] The above preferred metal alloys can not only make the inner layer 3 have a certain strength, thereby helping to maintain the conical shape of the inner layer 3 at low temperatures (below 60°C), but also help it to quickly dissolve in the aqueous solution under high temperature (above 60°C) environment, so that after the self-expanding double-conical blasthole temporary plugging agent has completed its role in plugging the holes, it will be discharged with the return fluid, thereby reducing damage to the reservoir.

[0032] In some embodiments of the present application, the metal alloy is preferably dissolved in an aqueous solution at 50-120° C. after 10-30 hours, which helps to achieve smooth degradation of the metal alloy in the aqueous solution, thereby reducing its damage to the reservoir.

[0033] In one embodiment of the present application, the thickness of the above-mentioned intermediate layer 2 is ≥2 mm, and the heat-expandable resin preferably expands at 50-120° C. after 5-30 minutes; the heat-expandable resin preferably dissolves in the aqueous solution after 8-36 hours; the heat-expandable resin is preferably selected from any one or more of epoxy resin, unsaturated polyester resin, and acrylic resin.

[0034] The preferred thermal expansion resin can ensure that the pores in the reservoir are fully blocked after rapid expansion, and can be smoothly degraded in aqueous solution, thereby reducing its damage to the reservoir.

[0035] In one embodiment of the present application, the thickness of the outer shell 1 is ≥2 mm, and the rubber is preferably dissolved in an aqueous solution at 50-120° C. after 10-30 hours; the rubber is preferably polyurethane rubber.

[0036] Rubber has excellent elasticity. After the thermal expansion resin expands, it can not only bring some deformation to the temporary plugging agent, so that the temporary plugging agent can better adapt to the irregular holes, but also keep the basic structure of the temporary plugging agent from being destroyed in a short period of time, thereby improving the effectiveness of the perforation cluster.

[0037] In one embodiment of the present application, when the temperature of the reservoir of the oil well section is 80°C≤≤120°C, and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:10-25; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:40-50.

[0038] By adjusting the amount of curing agent added to the thermal expansion resin, the time when the temporary plugging agent starts to expand can be controlled, and the time required for the temporary plugging agent to reach the temporary plugging section from the ground during on-site construction. It is preferred to control the mass ratio of the thermal expansion resin and the curing agent within the above ranges, which helps to improve the effectiveness of the perforation clusters in long well sections and short well sections under high temperature.

[0039] In one embodiment of the present application, when the temperature of the reservoir of the oil well section is 50°C≤80°C and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:25-40; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:50-60.

[0040] By adjusting the amount of curing agent added to the thermal expansion resin, the time when the temporary plugging agent starts to expand can be controlled, and the time required for the temporary plugging agent to reach the temporary plugging section from the ground during on-site construction can be controlled. It is preferred to control the mass ratio of the thermal expansion resin and the curing agent within the above ranges, which helps to improve the effectiveness of the perforation clusters in long well sections and short well sections at low temperatures.

[0041] The beneficial effects of the present application will be further illustrated below in conjunction with embodiments.

[0042] Example 1

[0043] Self-expanding double cone type temporary plugging agent for high temperature long well section:

[0044] In this embodiment, the temporary plugging agent provided by the present invention is used to temporarily plug the horizontal well with a high temperature reservoir and a long horizontal section. The horizontal section of Sudong XX well is 2030m long, the average reservoir burial depth is 3300m, and the reservoir temperature is 90°C. The self-expanding double cone blasthole temporary plugging agent (hereinafter referred to as temporary plugging agent) provided by the present invention is used to temporarily plug the well. The structure of the temporary plugging agent is as follows: Figure 1 shown.

[0045] The shell of the temporary plugging agent is polyurethane rubber, and the internal cone of the temporary plugging agent is a soluble metal alloy, which includes: 18.0% Al, 10.0% Cu, 2.0% Zn, 3.3% Ni, 4.0% In, and the rest is Mg and a small amount of impurities. The temporary plugging agent middle layer 2 (the thermal expansion resin is dicyclopentadiene epoxy resin, and the mass ratio of dicyclopentadiene epoxy resin and isocyanate curing agent is 100:25) can expand in a 90°C environment for 30 minutes and can be completely dissolved in 20 hours.

[0046] In this embodiment, the difference between the outer diameter Da of the self-expanding double-cone temporary plugging agent and the perforation hole diameter Dp before fracturing is Da-Dp≥2mm, the total length L=1.63D, and the height of the cylinder L2=0.15L1. The thickness δ of the outer shell 1 of the temporary plugging agent is 2mm, and the thickness δ of the expansion body of the middle layer 2 is 2mm.

[0047] Example 2

[0048] Self-expanding double cone type blasthole temporary plugging agent is used for low temperature long well section:

[0049] In this embodiment, the temporary plugging agent provided by the present invention is used to temporarily plug a horizontal well with a low-temperature reservoir and a long horizontal section. The horizontal section of the ShuangXX well is 2600m long, the average reservoir burial depth is 2300m, and the reservoir temperature is 68°C. The temporary plugging agent provided by the present invention is used to temporarily plug the well. The structure of the temporary plugging agent is as follows: Figure 1 shown.

[0050] The shell of the temporary plugging agent is polyurethane rubber, and the internal cone of the temporary plugging agent is a soluble metal alloy, which includes: 18.0% Al, 10.0% Cu, 2.0% Zn, 3.3% Ni, 4.0% In, and the rest is Mg and a small amount of impurities. The temporary plugging agent middle layer 2 (the thermal expansion resin is dicyclopentadiene epoxy resin, and the mass ratio of dicyclopentadiene epoxy resin to isocyanate is 100:40) can expand in a 68°C environment for 35 minutes and can be completely dissolved in 20 hours.

[0051] In this embodiment, the difference between the outer diameter Da of the self-expanding double cone type temporary plugging agent and the perforation hole diameter Dp before fracturing is Da-Dp≥2mm, and the total length L=1.63D. The thickness δ of the outer shell 1 of the temporary plugging agent is 2mm, and the thickness δ of the expansion body of the middle layer 2 is 2mm.

[0052] Example 3

[0053] Self-expanding double cone type blasthole temporary plugging agent is used for high temperature short well section:

[0054] In this embodiment, the temporary plugging agent provided by the present invention is used to temporarily plug the high-temperature reservoir and the horizontal well with a short horizontal section. The horizontal section of Su XX well is 800m long, the average reservoir burial depth is 3400m, and the reservoir temperature is 90°C. The temporary plugging agent provided by the present invention is used to temporarily plug the well. The structure of the temporary plugging agent is as follows: Figure 1 shown.

[0055] The shell of the temporary plugging agent is polyurethane rubber, and the internal cone of the temporary plugging agent is a soluble alloy, the metal alloy includes: 18.0% Al, 10.0% Cu, 2.0% Zn, 3.3% Ni, 4.0% In, and the rest is Mg and a small amount of impurities. The temporary plugging agent middle layer 2 (the thermal expansion resin is dicyclopentadiene epoxy resin, and the mass ratio of dicyclopentadiene epoxy resin to isocyanate is 100:50) can expand in a 90°C environment for 15 minutes and can be completely dissolved in 20 hours.

[0056] In this embodiment, the difference between the outer diameter Da of the self-expanding double cone type temporary plugging agent and the perforation hole diameter Dp before fracturing is Da-Dp≥2mm, and the total length L=1.63D. The thickness δ of the outer shell 1 of the temporary plugging agent is 2mm, and the thickness δ of the expansion body of the middle layer 2 is 2mm.

[0057] Example 4

[0058] Self-expanding double cone type blasthole temporary plugging agent is used for low temperature short well section:

[0059] In this embodiment, the temporary plugging agent provided by the present invention is used to temporarily plug the low-temperature reservoir and the horizontal well with a short horizontal section. The horizontal section of Su XX well is 677m long, the average reservoir burial depth is 2400m, and the reservoir temperature is 78°C. The temporary plugging agent provided by the present invention is used to temporarily plug the well. The structure of the temporary plugging agent is as follows: Figure 1shown.

[0060] The shell of the temporary plugging agent is polyurethane rubber, and the internal cone of the temporary plugging agent is a soluble metal alloy, which includes: 18.0% Al, 10.0% Cu, 2.0% Zn, 3.3% Ni, 4.0% In, and the rest is Mg and a small amount of impurities. The temporary plugging agent middle layer 2 (the thermal expansion resin is dicyclopentadiene epoxy resin, and the mass ratio of dicyclopentadiene epoxy resin to isocyanate is 100:60) can expand in an environment of 80°C for 15 minutes and can be completely dissolved in 20 hours.

[0061] In this embodiment, the difference between the outer diameter Da of the self-expanding double cone type temporary plugging agent and the perforation hole diameter Dp before fracturing is Da-Dp≥2mm, and the total length L=1.63D. The thickness δ of the outer shell 1 of the temporary plugging agent is 2mm, and the thickness δ of the expansion body of the middle layer 2 is 2mm.

[0062] Example 5

[0063] The difference from the first embodiment is that the total length L=1.68D.

[0064] Example 6

[0065] The difference from the first embodiment is that the total length L=1.60D.

[0066] Example 7

[0067] The difference from the first embodiment is that the height L2 of the cylinder is 0.2L1.

[0068] Example 8

[0069] The difference from the first embodiment is that the height L2 of the cylinder is equal to 0.1L1.

[0070] Example 9

[0071] The difference from Example 1 is that the mass ratio of the dicyclopentadiene epoxy resin to the isocyanate curing agent is 120:10.

[0072] Example 10

[0073] The difference from Example 2 is that the mass ratio of dicyclopentadiene epoxy resin to isocyanate curing agent is 120:25.

[0074] Embodiment 11

[0075] The difference from Example 3 is that the mass ratio of the dicyclopentadiene epoxy resin to the isocyanate curing agent is 120:40.

[0076] Example 12

[0077] The difference from Example 4 is that the mass ratio of the dicyclopentadiene epoxy resin to the isocyanate curing agent is 120:50.

[0078] Comparative Example 1

[0079] The difference from Example 1 is that the horizontal section of the Sudong XX well is 2150 m long, the average reservoir burial depth is 3200 m, the reservoir temperature is 86° C., and a rigid temporary plugging ball is used to temporarily plug the well.

[0080] Comparative Example 2

[0081] The difference from Example 2 is that the horizontal section of the ShuangXX well is 2700 m long, the average reservoir burial depth is 2250 m, the reservoir temperature is 68°C, and a rigid temporary plugging ball is used to temporarily plug the well.

[0082] Comparative Example 3

[0083] The difference from Example 3 is that the horizontal section of Su XX well is 920 m long, the average reservoir burial depth is 3510 m, the reservoir temperature is 92° C., and a rigid temporary plugging ball is used to temporarily plug the well.

[0084] Comparative Example 4

[0085] The difference from Example 4 is that the horizontal section of Su XX well is 805 m long, the average reservoir burial depth is 2350 m, the reservoir temperature is 72° C., and a rigid temporary plugging ball is used to temporarily plug the well.

[0086] The amount of double-cone blasthole temporary plugging agent required is determined according to the construction situation, and the ratio of the number of perforations in each section to the number of double-cone blasthole temporary plugging agents in any one of Examples 1 to 12 is controlled to be 1:0.8 for the release of the double-cone blasthole temporary plugging agent, and the ratio of the number of perforations in each section to the number of rigid temporary plugging balls in any one of Comparative Examples 1 to 4 is controlled to be 1:0.8 for the release of the rigid temporary plugging balls.

[0087] The degradation rates and average temporary plugging pressure-raising values ​​of the temporary plugging agents in the above Examples 1 to 12 and Comparative Examples 1 to 4 are listed in Table 1.

[0088] Table 1

[0089] Implementation / Comparative Example Average temporary plugging pressure rise / MPa Degradation rate / % Example 1 17.2 95.0 Example 2 14.3 92.3 Example 3 16.5 100.0 Example 4 15.8 85.7 Example 5 16.8 93.2 Example 6 12.9 88.4 Example 7 14.4 87.2 Example 8 11.5 91.0 Example 9 17.4 89.6 Example 10 15.3 85.7 Embodiment 11 16.2 92.5 Example 12 17.6 89.7 Comparative Example 1 10.4 67.3 Comparative Example 2 8.3 79.5 Comparative Example 3 9.8 66.7 Comparative Example 4 9.6 71.4

[0090] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0091] The above self-expanding double-cone blasthole temporary plugging agent of the present application is put into the ground pipeline, and after reaching the formation plugging hole position, it uses its conical structure to plug the hole. Furthermore, the temporary plugging agent expands and completely plugs the irregular holes after abrasion. In particular, it can effectively plug the perforation clusters with severe abrasion, thereby improving the effectiveness of the perforation clusters, promoting the balanced expansion of the perforation clusters, increasing the fracturing transformation volume, and improving the post-fracturing production capacity.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-expanding double-cone blasthole temporary plugging agent, characterized in that: The structure of the self-expanding double-conical blasthole temporary plugging agent comprises a cylinder and two conical structures, wherein the two bottom surfaces of the cylinder coincide with the bottom surfaces of the two conical structures respectively; the cylinder and the two conical structures independently comprise an outer shell (1), an intermediate layer (2) and an inner layer (3) from the outside to the inside; the inner layers (3) of the two conical structures are cone-shaped, the inner layer (3) comprises a metal alloy, the intermediate layer (2) comprises a thermal expansion resin and a curing agent, and the outer shell (1) comprises rubber.

2. The self-expanding double-cone blasthole temporary plugging agent according to claim 1, characterized in that: The difference (Da-Dp) between the outer diameter Da of the bottom surface of the cylinder and the diameter Dp of the perforation hole before fracturing is ≥2 mm.

3. The self-expanding double-cone blasthole temporary plugging agent according to claim 2, characterized in that: The distance L1 between the vertices of the two cone structures is (1.63-1.68) Da.

4. The self-expanding double-cone blasthole temporary plugging agent according to claim 3, characterized in that: The height L2 of the cylinder is equal to (0.15-0.2) L1.

5. The self-expanding double-cone temporary blasthole plugging agent according to any one of claims 1 to 4, characterized in that: In terms of mass percentage, the metal alloy includes: 12.0-18.0% Al, 2.0-10.0% Cu, 2.0-3.6% Zn, 1.5-3.3% Ni, 0.01-8.0% In, and the rest is Mg and a small amount of impurities.

6. The self-expanding double-cone temporary blasthole plugging agent according to any one of claims 1 to 5, characterized in that: The metal alloy is dissolved in the aqueous solution at 50-120° C. after 10-30 hours.

7. The self-expanding double-cone temporary blasthole plugging agent according to any one of claims 1 to 6, characterized in that: The thickness of the intermediate layer (2) is ≥2 mm. Preferably, the heat-expandable resin expands at 50-120° C. after 5-30 minutes. Preferably, the heat-expandable resin dissolves in an aqueous solution after 8-36 hours. Preferably, the heat-expandable resin is selected from any one or more of epoxy resin, unsaturated polyester resin, and acrylic resin.

8. The self-expanding double-cone blasthole temporary plugging agent according to any one of claims 1 to 7, characterized in that: The thickness of the outer shell (1) is ≥2 mm. The rubber is preferably dissolved in an aqueous solution at 50 to 120° C. after 10 to 30 hours. The rubber is preferably polyurethane rubber.

9. The self-expanding double-cone blasthole temporary plugging agent according to any one of claims 1 to 8, characterized in that: When the temperature of the reservoir of the oil well section is 80°C≤≤120°C, and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:10-25; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:40-50.

10. The self-expanding double-cone temporary blasthole plugging agent according to any one of claims 1 to 8, characterized in that: When the temperature of the reservoir of the oil well section is 50°C≤80°C, and the length of the oil well section is 1000-2500m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:25-40; or when the length of the oil well section is 500-1000m, the mass ratio of the thermal expansion resin to the curing agent is 100-120:50-60.

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