Liquid metal bridge plug with short curing time for shaft plugging

Abstract

The invention relates to the technical field of bridge plugs, in particular to a liquid metal bridge plug with short curing time for shaft plugging. The refractory material is prepared from the following raw materials: bismuth trioxide, ferrous disulfide, petroleum coke, a solvent-free adhesive, silicon dioxide, calcium carbonate, alkaline residues and auxiliary materials. In the invention, a high-temperature environment is formed by utilizing a large amount of heat released by exothermic reaction, so that the bismuth element is reduced and forms a liquid bismuth alloy material, and the bismuth alloy material flows in the shaft to block the shaft; in a high-temperature environment, calcium carbonate is decomposed to generate calcium oxide, the calcium oxide can be matched with a complete reaction product of ferrous disulfide, an exothermic reaction is carried out, the temperature of the bridge plug can be maintained, the bismuth alloy material has enough time to block a shaft, then the bismuth alloy material is used as eutectic alloy, and direct solidification is carried out during cooling; the quick curing of the bridge plug is realized without the characteristic of a gel phase, the prolonging of the overall construction time is avoided, and the unnecessary risk and cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge plugs, and specifically, to a liquid metal bridge plug for wellbore plugging with a short curing time. Background Art

[0002] A bridge plug is a device used to plug a wellbore, usually composed of a bridge plug body, a setting tool, a fishing tool, etc. In downhole operations, the bridge plug can be placed at a predetermined position through the setting tool to achieve the purpose of plugging the wellbore, and is mainly used for plugging and fishing operations in oil, natural gas and other downholes.

[0003] Currently, for the plugging of oil and gas wellbores, most operators generally use cement or resin for plugging. Among them, cement plugging is the most traditional plugging method. Taking ultra-fine cement as an example, it can fully fit the pore surface and fill the pores during plugging, improving the integrity and firmness of the plugging, and the structure formed by the plugging has a large strength. However, the disadvantage is that the cement curing time is long, usually 48h; as a kind of chemical plugging, resin has the characteristics of strong corrosion resistance and strong anti-pollution performance. However, the disadvantage is that the curing time of the resin bridge plug is relatively long, generally requiring 24h or more, and it is greatly affected by environmental conditions. That is, the too long curing time of the existing cement or resin bridge plug will lead to an extension of the overall construction time, significantly increasing the operation risk and cost. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the problems in the prior art that the cement-based bridge plugs and resin-based bridge plugs have a long curing time, are easily affected by the environment, and the overall construction time is extended, resulting in a significant increase in operation risk and cost.

[0005] The purpose of the present invention is to provide a liquid metal bridge plug for wellbore plugging with a short curing time, which can quickly solidify the bridge plug to reduce the overall construction time. The wellbore is plugged by the fluidity of the bismuth alloy material in the liquid state, and then the bismuth alloy is a eutectic alloy, which directly solidifies when cooled, without the need for a gel phase, reducing the curing time to ensure the rapid solidification of the bridge plug.

[0006] To achieve the above purpose, the present invention aims to provide a liquid metal bridge plug for wellbore plugging with a short curing time, including raw materials with the following mass percentages: Bismuth trioxide 22-34%, ferrous disulfide 6-12%, petroleum coke 10-16%, solvent-free binder 3-6%, silicon dioxide 2-4%, calcium carbonate 9-15%, alkali residue 1-2%, and the balance is auxiliary materials.

[0007] As a further improvement of this technical solution, the bismuth trioxide is one of α-type bismuth trioxide or β-type bismuth trioxide.

[0008] As a further improvement of the technical solution, the mass ratio of bismuth trioxide in the liquid metal bridge plug is one of 24%, 27%, 28% or 31%.

[0009] As a further improvement of the technical solution, the iron disulfide is cubic crystal iron disulfide, and the particle size ranges of both the iron disulfide and the silicon dioxide are 200 - 400 mesh.

[0010] As a further improvement of the technical solution, the mass ratio of the iron disulfide in the liquid metal bridge plug is one of 7%, 10% or 11%.

[0011] As a further improvement of the technical solution, the petroleum coke is one of needle coke or sponge coke.

[0012] As a further improvement of the technical solution, the mass ratio of the petroleum coke in the liquid metal bridge plug is one of 12%, 13% or 15%.

[0013] As a further improvement of the technical solution, the mass ratio of the calcium carbonate in the liquid metal bridge plug is one of 10%, 12%, 13%.

[0014] As a further improvement of the technical solution, the solvent - free binder includes epoxy resin and thermoplastic resin, and the mass ratio of the epoxy resin to the thermoplastic resin is 1:2.

[0015] As a further improvement of the technical solution, the auxiliary materials include quartz sand and fly ash, and the mass ratio of the quartz sand to the fly ash is 1:1.

[0016] In the present invention, after igniting the material, a high - temperature environment is formed by the heat provided by the exothermic reaction, so that each component material in the material is reduced, and after reduction, they are combined to form a liquid bismuth alloy material. The wellbore is blocked by the fluidity of the bismuth alloy material. Subsequently, by utilizing the characteristics that the bismuth alloy material can bypass the gel phase and can quickly solidify after cooling, the complete solidification time of the bridge plug material is reduced.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the wellbore plugging liquid metal bridge plug with a short curing time, by igniting the iron disulfide to generate an exothermic reaction, a large amount of heat released by the exothermic reaction is used to form a high - temperature environment. In this high - temperature environment, bismuth elements are reduced and combined with free elements such as iron to form a liquid bismuth alloy material. Furthermore, by utilizing the characteristics that the bismuth alloy material has fluidity like water, a large specific gravity and strong permeability, the bismuth alloy material flows in the wellbore to effectively infiltrate and plug the micro - pores in the wellbore, and the plugging shape is not limited, which can ensure the sealing effect after the bridge plug is solidified; Meanwhile, in the high-temperature environment formed during the reaction of iron disulfide, calcium carbonate decomposes to form calcium oxide. When the iron disulfide has completely reacted, the calcium oxide can react with the complete reaction product of iron disulfide, and the exothermic reaction can maintain the temperature of the bridge plug, enabling the bismuth alloy material to have sufficient time to block the wellbore. After the blocking is completed, the exothermic reaction ends. Then, using the bismuth alloy material as a eutectic alloy, it directly solidifies upon cooling without the need for the gel phase, achieving rapid curing of the bridge plug, avoiding the extension of the overall construction time, and reducing unnecessary risks and costs. Description of the Drawings

[0018] Figure 1 Test results of the curing time of the bridge plug of the present invention Figure 1 ; Figure 2 Test results of the curing time of the bridge plug of the present invention Figure 2 ; Figure 3 Test results of the curing time of the bridge plug of the present invention Figure 3 ; Figure 4 Test results of the curing time of the bridge plug of the present invention Figure 4 . Detailed Embodiments

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] When plugging the wellbore of an oil and gas well, cement or resin is mostly used for plugging. The common disadvantage of cement plugging and resin plugging is that the curing time is relatively long, generally requiring waiting for 24 hours or longer, and it is greatly affected by environmental conditions. The too long curing time of the bridge plug will lead to the extension of the overall construction time. Therefore, the purpose of the present invention is to provide a liquid metal bridge plug for wellbore plugging with a short curing time, which comprises raw materials with the following mass ratios: Bismuth trioxide 22 - 34%, iron disulfide 6 - 12%, petroleum coke 10 - 16%, solvent-free binder 3 - 6%, silicon dioxide 2 - 4%, calcium carbonate 9 - 15%, alkali residue 1 - 2%, and the balance is auxiliary materials.

[0021] Among them, the bismuth trioxide is one of α-type bismuth trioxide or β-type bismuth trioxide. There are crystal forms such as α-type and β-type bismuth trioxide. Due to their loose structures, they are easily reduced to metallic bismuth, thereby reducing the difficulty of producing the bismuth alloy material.

[0022] The iron disulfide is cubic crystal iron disulfide, and the particle size ranges of both the iron disulfide and the silicon dioxide are 200 - 400 mesh. The iron disulfide is used to promote the formation of the bismuth alloy material by exothermic reaction, and the silicon dioxide can improve the strength and hardness of the cured bridge plug, enabling it to better resist external pressure and wear during the plugging process.

[0023] The petroleum coke is one of needle coke or sponge coke. Petroleum coke is a carbon-rich residue left after the distillation and cracking of crude oil. Compared with residual oil, the carbon content in petroleum coke is relatively high, especially for needle coke or sponge coke, and the carbon content of both is usually above 80wt%. A large amount of carbon can participate in the reaction during the use of the bridge plug.

[0024] The solvent-free adhesive includes epoxy resin and thermoplastic resin, and the mass ratio of the epoxy resin to the thermoplastic resin is 1:2. Before the use of the bridge plug, the component materials are bonded together by the solvent-free adhesive. When melted at high temperature during use, the component materials can be dispersed.

[0025] The auxiliary materials include quartz sand and fly ash, and the mass ratio of the quartz sand to the fly ash is 1:1.

[0026] Weigh the above raw materials according to the mass ratio and premix them through a mixer. After ensuring the homogenization of the components, heat them under the protection of an inert atmosphere at a temperature not higher than 150°C for 3 - 8 minutes, and then cool them to room temperature using a gradient cooling mode. Subsequently, use a grinder to grind them to obtain the bridge plug material.

[0027] The following specific examples are used to further illustrate a liquid metal bridge plug for wellbore plugging with a short curing time provided by the present invention.

[0028] Example 1 The purpose of this example is to provide a liquid metal bridge plug for wellbore plugging, including the following raw materials in mass ratio: Bismuth trioxide 22%, iron disulfide 12%, petroleum coke 10%, solvent-free adhesive 6%, silicon dioxide 2%, calcium carbonate 15%, alkali residue 1%, and the balance is auxiliary materials.

[0029] Among them, the bismuth trioxide is α-type bismuth trioxide.

[0030] The iron disulfide is cubic crystal iron disulfide, and the particle size ranges of both the iron disulfide and the silicon dioxide are 200 mesh.

[0031] The petroleum coke is needle coke.

[0032] The solvent-free adhesive includes epoxy resin and thermoplastic resin, and the mass ratio of the epoxy resin to the thermoplastic resin is 1:2.

[0033] The auxiliary materials include quartz sand and fly ash, and the mass ratio of quartz sand to fly ash is 1:1.

[0034] Weigh the above raw materials according to the mass ratio and premix them through a blender. After ensuring the homogenization of the components, heat them under the protection of an inert atmosphere at a temperature not higher than 150 °C for 8 minutes, then cool them to room temperature using a gradient cooling mode, and subsequently use a grinder to grind them to obtain the bridge plug material.

[0035] Example 2 The purpose of this example is to provide a liquid metal bridge plug for wellbore plugging, including raw materials with the following mass ratios: Bismuth trioxide 28%, iron disulfide 10%, petroleum coke 15%, solvent-free binder 4%, silicon dioxide 3%, calcium carbonate 12%, alkali residue 1%, and the balance is auxiliary materials.

[0036] Among them, bismuth trioxide is β-type bismuth trioxide.

[0037] Iron disulfide is cubic crystal form iron disulfide, and the particle size ranges of both iron disulfide and silicon dioxide are 300 mesh.

[0038] The petroleum coke is needle coke.

[0039] The solvent-free binder includes epoxy resin and thermoplastic resin, and the mass ratio of epoxy resin to thermoplastic resin is 1:2.

[0040] The auxiliary materials include quartz sand and fly ash, and the mass ratio of quartz sand to fly ash is 1:1.

[0041] Weigh the above raw materials according to the mass ratio and premix them through a blender. After ensuring the homogenization of the components, heat them under the protection of an inert atmosphere at a temperature not higher than 150 °C for 5 minutes, then cool them to room temperature using a gradient cooling mode, and subsequently use a grinder to grind them to obtain the bridge plug material.

[0042] Example 3 The purpose of this example is to provide a liquid metal bridge plug for wellbore plugging, including raw materials with the following mass ratios: Bismuth trioxide 34%, iron disulfide 6%, petroleum coke 16%, solvent-free binder 3%, silicon dioxide 4%, calcium carbonate 9%, alkali residue 2%, and the balance is auxiliary materials.

[0043] Among them, bismuth trioxide is β-type bismuth trioxide.

[0044] Iron disulfide is cubic crystal form iron disulfide, and the particle size ranges of both iron disulfide and silicon dioxide are 400 mesh.

[0045] The petroleum coke is sponge coke.

[0046] The solventless adhesive comprises an epoxy resin and a thermoplastic resin, and the mass ratio of the epoxy resin to the thermoplastic resin is 1:2.

[0047] The auxiliary materials comprise quartz sand and fly ash, and the mass ratio of the quartz sand to the fly ash is 1:1.

[0048] Weigh the above raw materials according to the mass ratio and premix them through a blender. After ensuring the homogenization of the components, heat them at a temperature not higher than 150 °C for 3 min under the protection of an inert atmosphere, then cool them to room temperature using a gradient cooling mode, and subsequently use a grinder to grind them to obtain the bridge plug material.

[0049] Perform simulated plugging tests on the bridge plug materials prepared in Examples 1-3. Set up multiple simulated wellbore devices (the simulated wellbore devices are composed of an autoclave, a casing simulation section, a temperature control system, etc.). After installing and deploying the bridge plug materials prepared in Examples 1-3 in the simulated wellbore devices through a setting tool respectively, melt the bridge plug materials into a liquid state by means including but not limited to electric spark heating and thermite heating, so that the bridge plug materials are plugged. Record the time consumed from ignition to complete curing of the bridge plug, and record the recorded complete curing time in Table 1.

[0050] Table 1 Complete curing time of the bridge plug materials prepared in Examples 1-3 Example 1 Example 2 Example 3 Time for complete curing / h 6.3 5.5 7.1 It can be seen from Table 1 that the complete curing time of the bridge plug materials prepared in Examples 1-3 is lower than 7.1 h. The curing speed of the bridge plug is fast and the curing time is short, which can improve the plugging construction efficiency of the oil and gas wellbore.

[0051] In the present invention, bismuth trioxide is used as the material providing bismuth element. By igniting iron disulfide, an exothermic reaction occurs. Using the large amount of heat released by the exothermic reaction to form a high-temperature environment, in the high-temperature environment, both bismuth trioxide and the reaction products of iron disulfide are reduced. The bismuth element combines with free iron and copper elements to form a bismuth alloy material. And under the action of continuously releasing heat during the reaction of iron disulfide, the bismuth alloy material remains in a liquid state. Furthermore, taking advantage of the characteristics that the bismuth alloy material has fluidity like water, a large specific gravity and strong permeability, the bismuth alloy material flows in the wellbore, realizing effective infiltration and plugging of the micro-pores in the wellbore, and the plugging shape is not limited, which can ensure the sealing effect after the bridge plug is cured; In the high temperature environment formed when ferrous disulfide reacts, calcium carbonate decomposes to form calcium oxide. When ferrous disulfide reacts completely, calcium oxide can cooperate with the complete reaction product of ferrous disulfide to produce an exothermic reaction that can maintain the temperature of the bridge plug, so that the bismuth alloy material has enough time to seal the wellbore. When the sealing is completed, the exothermic reaction ends, and then the bismuth alloy material is used as a eutectic alloy. It directly solidifies when cooled, without the characteristics of a gel phase, to achieve rapid solidification of the bridge plug, avoid extending the overall construction time, and reduce unnecessary risks and costs.

[0052] Example 4 In order to ensure that the bridge plug material can generate a bismuth alloy material and form a high-temperature environment during plugging to ensure that the bismuth alloy material remains in a liquid state, so that the bismuth alloy material can flow to plug the wellbore, the bridge plug material provided by the present invention contains components such as ferrous disulfide. After igniting and stimulating the reaction of ferrous disulfide, a large amount of heat can be released by the exothermic reaction of ferrous disulfide, thereby increasing the temperature to form a high-temperature environment, thereby promoting the reaction of each component material to generate a bismuth alloy material. The entire reaction process is as follows: In the formula, For ferrous disulfide, For oxygen, It is ferric oxide, is sulfur dioxide, is bismuth trioxide, It is a single substance of carbon, mainly provided by petroleum coke. Bismuth is a single substance. is carbon monoxide, For sulfur dioxide. It is elemental sulfur. Iron is a single substance. for carbon dioxide; During the entire reaction process, ferrous disulfide is first ignited and reacts with oxygen to produce ferric oxide and sulfur dioxide and releases a large amount of heat. Then the temperature rises to form a high-temperature environment, causing bismuth trioxide to undergo a reduction reaction with carbon to produce bismuth and carbon monoxide, and carbon to undergo an oxidation-reduction reaction with sulfur dioxide to produce carbon monoxide and sulfur. Then ferrous oxide undergoes an oxidation-reduction reaction with carbon monoxide to produce iron and carbon dioxide. Finally, bismuth and iron combine to form a bismuth alloy material. Under the action of high temperature, the bismuth alloy material remains in a liquid state and flows to achieve plugging of the wellbore.

[0053] In the above process, heat is mainly released by the reaction of ferrous disulfide to promote the progress of the subsequent process. Therefore, in order to determine that ferrous disulfide and the mass proportion of 6-12% of ferrous disulfide are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly plug the wellbore, this embodiment, on the basis of the above embodiment 2, only changes the mass proportion of ferrous disulfide, and sets the mass proportion of ferrous disulfide in the liquid metal bridge plug to 0, 5%, 6%, 7%, 10%, 11%, 12%, 15% or 18%, and then prepares the bridge plug material, and then tests the complete curing time of the bridge plug material according to the simulated plugging test method recorded in the above embodiment. The test results are as follows: Figure 1 shown.

[0054] according to Figure 1 It can be seen that when the mass proportion of ferrous disulfide in the bridge plug material is 6%, 7%, 10%, 11% or 12%, the time required for the complete curing of the bridge plug is less than 7 hours, indicating that the curing speed of the bridge plug is fast; When the mass proportion of ferrous disulfide in the bridge plug material is 0, 5%, 15% or 18%, that is, when the mass proportion of ferrous disulfide is not 6-12%, the curing time of the bridge plug is significantly increased, indicating that ferrous disulfide and the 6-12% mass proportion of ferrous disulfide are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly block the wellbore.

[0055] Secondly, bismuth trioxide is used as a raw material for providing bismuth, and bismuth trioxide can generate carbon monoxide during the reduction reaction, and carbon monoxide can undergo an oxidation-reduction reaction with ferric oxide to obtain iron element used to form a bismuth alloy material. Therefore, in order to determine that bismuth trioxide and a mass proportion of 22-34% of bismuth trioxide are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly plug the wellbore, this embodiment, based on the above-mentioned Example 2, only changes the mass proportion of bismuth trioxide, and sets the mass proportion of bismuth trioxide in the liquid metal bridge plug to 0, 20%, 22%, 24%, 27%, 28%, 31%, 34% or 37%, and then prepares a bridge plug material, and then tests the complete solidification time of the bridge plug material according to the simulated plugging test method recorded in the above-mentioned embodiment. The test results are as follows: Figure 2 shown.

[0056] according to Figure 2 It can be seen that when the mass proportion of bismuth trioxide in the bridge plug material is 22%, 24%, 27%, 28%, 31% or 34%, the time required for the complete curing of the bridge plug is less than 8.5h, indicating that the curing speed of the bridge plug is fast; When the mass proportion of bismuth trioxide in the bridge plug material is 0, 20% or 37%, that is, when the mass proportion of bismuth trioxide is not 22-34%, the curing time of the bridge plug is significantly increased, indicating that bismuth trioxide and the mass proportion of 22-34% of bismuth trioxide are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly block the wellbore.

[0057] In addition, petroleum coke is used in the present invention to provide carbon element. During the reaction, the carbon element reduces bismuth trioxide to bismuth element, and is converted into carbon monoxide itself. The carbon element reacts with sulfur dioxide to generate carbon monoxide. Therefore, petroleum coke is an important raw material in the present invention. In order to determine that petroleum coke and the mass proportion of 10-16% of petroleum coke are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly plug the wellbore, this embodiment, based on the above-mentioned Example 2, only changes the mass proportion of petroleum coke, and sets the mass proportion of petroleum coke in the liquid metal bridge plug to 0, 8%, 10%, 12%, 13%, 15%, 16%, 18% or 20%, and then prepares the bridge plug material, and then tests the complete curing time of the bridge plug material according to the simulated plugging test method recorded in the above-mentioned embodiment. The test results are as follows: Figure 3 shown.

[0058] according to Figure 3 It can be seen that when the mass proportion of petroleum coke in the bridge plug material is 10%, 12%, 13%, 15% or 16%, the time required for the complete curing of the bridge plug is less than 8.5h, indicating that the curing speed of the bridge plug is fast; When the mass proportion of petroleum coke in the bridge plug material is 0, 8%, 18% or 20%, that is, when the mass proportion of petroleum coke is not 10-16%, the curing time of the bridge plug increases significantly, indicating that petroleum coke and the mass proportion of 10-16% of petroleum coke are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly seal the wellbore.

[0059] Example 5 In the process of the bismuth alloy material flowing to complete the plugging of the wellbore, it is necessary to have sufficient flow time so that the bismuth alloy material can plug the wellbore. The bridge plug material provided by the present invention contains components such as calcium carbonate. In the stage of forming a high-temperature environment by the carbon disulfide reaction, the calcium carbonate decomposes to form calcium oxide, and the calcium oxide reacts with the product of the complete reaction of calcium disulfide to produce an exothermic reaction, which can release heat to maintain the temperature of the bridge plug, so that the bismuth alloy material can flow to completely plug the wellbore. The reaction process during this period is as follows: In the formula, is calcium carbonate, is calcium oxide, For carbon dioxide, It is elemental sulfur. is calcium sulfide, is calcium sulfate; Calcium carbonate decomposes to form calcium oxide and carbon dioxide. During the reaction of calcium oxide with sulfur, sulfur is both reduced and oxidized, producing calcium sulfide and calcium sulfate. Heat is released during the reaction to maintain the temperature of the bridge plug, enabling the bismuth alloy material to remain liquid and flow for plugging. When the plugging is completed, the exothermic reaction ends. Then, using the property that the bismuth alloy is a eutectic alloy and directly solidifies upon cooling without a gel phase, the bridge plug can be quickly solidified.

[0060] In the above process, the exothermic process is the product of the complete reaction of calcium oxide generated by the decomposition of calcium carbonate with calcium disulfide, thus quickly releasing heat to maintain the temperature of the bridge plug. Therefore, to determine that calcium carbonate and a mass ratio of 9 - 15% of calcium carbonate are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly plug the wellbore. Based on the above Example 2, only the mass ratio of calcium carbonate is changed, and the mass ratio of calcium carbonate in the liquid metal bridge plug is set to 0, 3%, 7%, 9%, 10%, 12%, 13%, 15% or 19%. Then, the bridge plug material is prepared, and the complete solidification time of the bridge plug material is tested according to the simulated plugging test method described in the above example. The test results are as Figure 4 shown.

[0061] According to Figure 4 it can be known that when the mass ratio of calcium carbonate in the bridge plug material is 9%, 10%, 12%, 13% or 15%, the complete solidification time of the bridge plug is less than 9 h, indicating that the bridge plug has a fast solidification speed; When the mass ratio of calcium carbonate in the bridge plug material is 0, 3%, 7% or 19%, that is, when the mass ratio of calcium carbonate is not 9 - 15%, the solidification time of the bridge plug increases significantly, indicating that calcium carbonate and a mass ratio of 9 - 15% of calcium carbonate are one of the important factors for the liquid metal bridge plug provided by the present invention to quickly plug the wellbore.

[0062] Example 6 Prepare the bridge plug material according to the formula provided in the above examples and the determined optimal ratio, and then test the bridge plug material according to the simulated plugging test method provided in the above examples; The test shows that under the working conditions of this example, the complete solidification time of the bridge plug is short, indicating that the bridge plug material provided by the present invention has the advantage of fast solidification speed and can avoid the problem of long solidification time of cement bridge plugs and resin bridge plugs.

[0063] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A liquid metal bridge plug for wellbore plugging with a short solidification time, characterized in that: Including the following raw materials by mass: Bismuth trioxide 22-34%, ferrous disulfide 6-12%, petroleum coke 10-16%, solvent-free adhesive 3-6%, silicon dioxide 2-4%, calcium carbonate 9-15%, alkali residue 1-2%, and the rest are auxiliary materials.

2. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1 is characterized in that: The bismuth trioxide is α-type bismuth trioxide or β-type bismuth trioxide.

3. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1 is characterized in that: The mass proportion of the bismuth trioxide in the liquid metal bridge plug is one of 24%, 27%, 28% or 31%.

4. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1 is characterized in that: The ferrous disulfide is cubic crystalline ferrous disulfide, and the particle sizes of ferrous disulfide and silicon dioxide are both in the range of 200-400 meshes.

5. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1, characterized in that: The mass proportion of ferrous disulfide in the liquid metal bridge plug is one of 7%, 10% or 11%.

6. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1, characterized in that: The petroleum coke is one of needle coke and sponge coke.

7. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1 is characterized by: The mass proportion of the petroleum coke in the liquid metal bridge plug is one of 12%, 13% or 15%.

8. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1, characterized in that: The mass proportion of calcium carbonate in the liquid metal bridge plug is one of 10%, 12% and 13%.

9. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1, characterized in that: The solvent-free adhesive comprises epoxy resin and thermoplastic resin, and the mass ratio of the epoxy resin to the thermoplastic resin is 1:

2.

10. The liquid metal bridge plug for wellbore plugging with a short solidification time according to claim 1, characterized in that: The auxiliary materials include quartz sand and fly ash, and the mass ratio of quartz sand to fly ash is 1:1.

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