Using method of elastic gel particles

Abstract

The invention relates to a use method of elastic gel particles, and belongs to the technical field of expansion plugging agents, the use method of the elastic gel particles comprises the following steps: preparation of a first tank: adding 27-28m < 3 > of clear water into a slurry preparation tank, and starting a stirrer; the plugging slurry is prepared through double tanks, the pumping pressure of a slurry pump is effectively controlled, the existing leakage amount is reduced to the lowest percentage of the initial leakage amount, and due to cooperative plugging of bentonite, elastic gel particles, a composite plugging agent and cottonseed hulls, the situation that single gel or rigid particles are prone to being diluted is avoided, and the effect of improving the success rate of large leakage plugging is achieved; by means of a heat conduction rapid balancing agent prepared from modified boron nitride nanosheets, sisal fibers, heat conduction ceramic fragments and an anti-deformation agent, the effect of rapidly conducting heat in the elastic gel particles is achieved, so that the maximum expansion speed of the elastic gel particles is obtained within a short time, and rapid plugging of a crack leakage layer is facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of swelling plugging agents, and particularly relates to a use method of elastic gel particles. BACKGROUND

[0002] Swelling plugging agents are a kind of materials that can block leakage channels by swelling in volume when encountering water or drilling fluid, and are widely used in the fields of building, oil drilling, underground engineering, etc.

[0003] Among them, the elastic gel particles are common swelling plugging agents, however, in the use process of the elastic gel particles, the single gel is easy to be diluted, the thickness of the single injection is difficult to control, and the pump pressure control is not accurate, thereby leading to a low success rate of plugging in large leakage. SUMMARY

[0004] The purpose of the present application is to provide a use method of elastic gel particles to solve the above problems.

[0005] The present application achieves the above-mentioned purpose through the following technical solutions:

[0006] The present application provides a use method of elastic gel particles, which comprises the following steps:

[0007] S1, first tank preparation: (1) first add 27-28 m3 of clean water in the slurry preparation tank, start the stirrer, control the stirring speed of the slurry preparation tank on the stirrer to be 19.5-35 r / min, and control the stirring time to be 10-13 min; (2) sequentially add 1-1.75 tons of bentonite, 2-3.5 tons of formation pressure enhancer, 2-3.5 tons of composite plugging agent, and 1-1.75 tons of cotton seed hulls by using a jet funnel, and control the required addition time to be 4-6 min; (3) add 1-1.27 tons of elastic gel particles, control the required addition time to be 1-2 min, and after the addition is completed, fully pump into the well;

[0008] S2, second tank preparation: (1) first add 20-25 m3 of clean water in the slurry preparation tank, start the stirrer, control the stirring speed of the slurry preparation tank on the stirrer to be 19.5-35 r / min, and control the stirring time to be 10-13 min; (2) sequentially add 1-1.5 tons of bentonite, 2-2.5 tons of formation pressure enhancer, 2-2.5 tons of composite plugging agent, and 1-1.5 tons of cotton seed hulls by using a jet funnel, and control the required addition time to be 4-6 min; (3) add 1-1.5 tons of elastic gel particles, control the required addition time to be 1-2 min, and after the addition is completed, close the well packer, and fully pump into the well by using a mud pump valve, at this time, the plugging slurry is obtained in the well;

[0009] S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled to be ≤5 MPa;

[0010] S4. Secondary mud replacement: After pulling out 300 meters, shut off the wellhead again and use a mud pump to pump 10m3 of mud replacement into the well.

[0011] S5. Wait two hours before drilling begins.

[0012] As a further optimization of the present invention, the raw materials for preparing the elastic gel particles, by weight, include: 30-40 parts cationic polyacrylamide, 18-22 parts high-viscosity methyl cellulose, 14-16 parts crosslinking agent, 5-8 parts 2-acrylamido-2-methylpropanesulfonic acid, 18-22 parts bentonite, 3-7 parts surface treatment agent, 3-7 parts initiator, and 9-13 parts thermal conductivity rapid equalization agent.

[0013] As a further optimization of the present invention, the raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 3-7 parts modified boron nitride nanosheets, 2-8 parts sisal fiber, 3-6 parts thermally conductive ceramic fragments, and 30-60 parts anti-degradation agent.

[0014] As a further optimization of the present invention, the raw materials for preparing the anti-variant include: 15-20 parts aluminum sol, 1-3 parts waterborne acrylic resin, 1-3 parts waterborne polyurethane resin, 3-7 parts co-solvent, 3-6 parts KH-560 silane coupling agent, and 1-4 parts tetramethylammonium hydroxide.

[0015] As a further optimization of the present invention, the preparation steps of the anti-variant are as follows: (i) Take an aqueous acrylic resin with a solid content of 40%, add a co-solvent of 8-12% of the total resin mass, stir the two together, control the stirring speed at 300-500 r / min, and control the stirring time at 4-6 min; (ii) Add KH-560 silane coupling agent of 0.8-1.2% of the total resin mass, heat to 58-62℃, control the stirring speed at 500-700 r / min, and control the stirring time at 1 minute. 8-22 min; (iii) Slowly add waterborne polyurethane resin and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to the aluminum sol with a solid content of 20% and adjust the pH to 5.5-6.0 to obtain a modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, controlling the stirring speed at 200-400 r / min, the stirring time at 50-70 min, and the stirring temperature at 40-50℃ to obtain an anti-mutation agent.

[0016] As a further optimization of the present invention, the preparation steps of the sisal fiber are as follows: (i) placing sisal leaves in a roller press, controlling the pressing pressure to 5-10 MPa, breaking the epidermis and removing 30-40% of the juice to obtain sap-drained sisal leaves; (ii) placing the sap-drained sisal leaves in pure water and heating to boiling, maintaining for 0.5-1 h, and removing the boiled leaves; (iii) rinsing the boiled leaves to remove the gum, obtaining degummed sisal; (iv) feeding the degummed sisal into a rotating sisal cage, controlling the rotation speed to 3-5 r / min, and using the mechanical feet of the threshing machine to compact the fiber; (v) immersing the entire sisal cage in FeSO4 solution for 15-30 min, and removing it; (vi) removing the leaves from the sisal cage, rinsing them clean with pure water, and drying them to obtain sisal fiber.

[0017] As a further optimization of the present invention, the preparation steps of the thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.1-0.3 mm.

[0018] As a further optimization of the present invention, the preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) immersing modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for a controlled immersion time of 30-40 min; (ii) removing the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and placing them in an environment at a temperature of 110-130℃ for curing; (iii) after curing, calcining the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for a controlled calcination time of 1-3 h and a controlled calcination temperature of 840-860℃, and after cooling, forming a 200 nm uniform coating on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) mixing and stirring the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments after the surface coating is formed to obtain the thermal conductivity rapid equalization agent.

[0019] As a further optimization of the present invention, the preparation steps of the elastic gel particles are as follows: (i) heating cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid to dissolve, and mixing and stirring the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid evenly to obtain a mixture; (ii) adding thermal conductivity fast equalizer, bentonite and high viscosity methyl cellulose to the mixture and mixing and stirring evenly; (iii) adding crosslinking agent to the mixture and mixing and stirring evenly; (iv) adding surface treatment agent dropwise to the mixture and mixing and stirring evenly; (v) adding initiator to the mixture and mixing and stirring evenly, then freezing and embrittlement at -20℃, and then granulating in a crushing-sieving machine to obtain elastic gel particles with a diameter of 1-3 mm.

[0020] The beneficial effects of this invention are as follows: the dual-tank preparation of the sealing slurry and the effective control of the slurry pump pressure minimize the current leakage to the lowest percentage of the initial leakage. The synergistic sealing effect of bentonite, elastic gel particles, composite sealing agent, and cottonseed hulls avoids the easy dilution of single gels or rigid particles, thus improving the success rate of sealing large leaks. Furthermore, the rapid thermal conductivity equalization agent prepared from modified boron nitride nanosheets, sisal fibers, thermally conductive ceramic fragments, and anti-degradation agents achieves rapid heat conduction within the elastic gel particles, thereby enabling the maximum expansion rate of the elastic gel particles in a short time, which helps to quickly seal the cracked leakage layer. Detailed Implementation

[0021] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] I. Materials

[0023] Unless otherwise specified, all methods used in this invention are conventional methods known to those skilled in the art, and all reagents and materials used are commercially available products.

[0024] In this invention:

[0025] The water can be any one or more of the following: pure water, mineral water, tap water, and groundwater.

[0026] The formation pressure enhancer specifically used is Yan'an Shengyuan Chemical-SY-138 pressure-reducing and injection-enhancing agent;

[0027] The composite sealant used is RS-801, manufactured by Rongsheng Chemical Co., Ltd.

[0028] The crosslinking agent specifically used is TAIC-99% produced by Hunan Lide Technology New Materials Co., Ltd.

[0029] The initiator used is TBPB initiator produced by Shandong Anda Chemical Co., Ltd.

[0030] The modified boron nitride nanosheets specifically used were model JR-BN100 produced by Xuancheng Jingrui New Materials.

[0031] The thermally conductive ceramic fragments specifically used are model TO-220 manufactured by Shenzhen Jia Ri Feng Tai Electronic Technology Co., Ltd.

[0032] The aluminum sol used is model XZ-1128 produced by Hefei Xiangzheng Chemical Technology Co., Ltd.

[0033] The co-solvent used is ENASOLV, manufactured by Shanghai Ruiyi Environmental Protection Technology Co., Ltd.

[0034] The KH-560 silane coupling agent specifically used is model KH-560 produced by Tianmen Hengchang Chemical Co., Ltd.

[0035] II. Methods

[0036] Example 1: The method of using elastic gel particles includes the following steps:

[0037] S1. First batch preparation: (a) First add 27m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 19.5 r / min, and control the mixing time to 10 min; (ii) Add 1 ton of bentonite, 2 tons of formation pressure enhancer, 2 tons of composite plugging agent and 1 ton of cottonseed hull in sequence using a jet funnel, and control the addition time to 4 min; (iii) Add 1 ton of elastic gel particles, and control the addition time to 1 min. After the addition is completed, pump it all into the well.

[0038] S2, Second batch preparation: (a) First add 20m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 19.5 r / min, and control the mixing time to 10 min; (ii) Add 1 ton of bentonite, 2 tons of formation pressure enhancer, 2 tons of composite plugging agent and 1 ton of cottonseed hull in sequence using a jet funnel, and control the addition time to 4 min; (iii) Add 1 ton of elastic gel particles, and control the addition time to 1 min. After the addition is completed, close the well sealer and use a mud pump valve to pump the entire amount into the well. At this time, the plugging slurry is obtained in the well.

[0039] S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 2 MPa.

[0040] S4. Secondary mud displacement: After pulling the drill string to 300 meters, shut off the wellhead again and use a mud pump to pump mud into the well for 10 meters. 3 ;

[0041] S5. Wait two hours before drilling begins;

[0042] The raw materials for preparing the elastic gel particles, by weight, include: 30 parts cationic polyacrylamide, 18 parts high-viscosity methyl cellulose, 14 parts crosslinking agent, 5 parts 2-acrylamido-2-methylpropanesulfonic acid, 18 parts bentonite, 3 parts surface treatment agent, 3 parts initiator, and 9 parts thermal conductivity rapid equalization agent.

[0043] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 3 parts modified boron nitride nanosheets, 2 parts sisal fiber, 3 parts thermally conductive ceramic fragments, and 30 parts anti-degradation agent.

[0044] The raw materials for preparing the anti-variant include: 15 parts aluminum sol, 1 part waterborne acrylic resin, 1 part waterborne polyurethane resin, 3 parts co-solvent, 3 parts KH-560 silane coupling agent, and 1 part tetramethylammonium hydroxide.

[0045] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 8%, stir the two together, control the stirring speed at 300 r / min, and control the stirring time at 4 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 0.8%, heat to 58℃, control the stirring speed at 500 r / min, and control the stirring time at 18 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 5.5, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 200 r / min, control the stirring time at 50 min, and control the stirring temperature at 40℃ to obtain the anti-mutation agent;

[0046] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 5 MPa, break the epidermis and remove 30% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.5 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 3 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO solution for 15 min, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0047] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.1 mm.

[0048] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 30 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 110℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 1 h and 840℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0049] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and mixed and stirred evenly; (iii) Crosslinking agent is added to the mixture and mixed and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and mixed and stirred evenly; (v) Initiator is added to the mixture and mixed and stirred evenly, then frozen and embrittled at -20℃, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 1 mm.

[0050] Example 2: The method of using elastic gel particles includes the following steps:

[0051] S1. First batch preparation: (a) First add 27.5m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 22 r / min, and control the mixing time to 11 min; (ii) Add 1.375 tons of bentonite, 2.75 tons of formation pressure enhancer, 2.75 tons of composite plugging agent and 1.375 tons of cottonseed hulls in sequence using a jet funnel, and control the addition time to 5 min; (iii) Add 1.135 tons of elastic gel particles, and control the addition time to 1.5 min. After the addition is completed, pump it all into the well.

[0052] S2, Second batch preparation: (a) First add 22.5m to the mixing tank. 3(i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 22 r / min, and control the mixing time to 11 min; (ii) Add 1.25 tons of bentonite, 2.25 tons of formation pressure enhancer, 2.25 tons of composite plugging agent and 1.25 tons of cottonseed hulls in sequence using a jet funnel, and control the addition time to 5 min; (iii) Add 1.25 tons of elastic gel particles, and control the addition time to 1.5 min. After the addition is completed, close the well sealer and use a mud pump valve to pump the mud into the well. At this time, the plugging slurry is obtained in the well.

[0053] S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 3 MPa.

[0054] S4. Secondary mud displacement: After pulling the drill string to 300 meters, shut off the wellhead again and use a mud pump to pump mud into the well for 10 meters. 3 ;

[0055] S5. Wait two hours before drilling begins;

[0056] The raw materials for preparing the elastic gel particles, by weight, include: 35 parts cationic polyacrylamide, 20 parts high-viscosity methyl cellulose, 15 parts crosslinking agent, 6 parts 2-acrylamido-2-methylpropanesulfonic acid, 20 parts bentonite, 5 parts surface treatment agent, 5 parts initiator, and 11 parts thermal conductivity rapid equalization agent.

[0057] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 5 parts modified boron nitride nanosheets, 6 parts sisal fiber, 4 parts thermally conductive ceramic fragments, and 45 parts anti-degradation agent.

[0058] The raw materials for preparing the anti-variant include: 17 parts aluminum sol, 2 parts waterborne acrylic resin, 2 parts waterborne polyurethane resin, 5 parts co-solvent, 4 parts KH-560 silane coupling agent, and 2 parts tetramethylammonium hydroxide.

[0059] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 10%, stir the two together, control the stirring speed at 400 r / min, and control the stirring time at 5 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 1%, heat to 58-62℃, control the stirring speed at 600 r / min, and control the stirring time at 20 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 5.7, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 300 r / min, control the stirring time at 60 min, and control the stirring temperature at 45℃ to obtain the anti-mutation agent;

[0060] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 7 MPa, break the epidermis and remove 35% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.7 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 4 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO4 solution for 24 min, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0061] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.2 mm;

[0062] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 35 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 120℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 2 h and 850℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0063] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and mixed and stirred evenly; (iii) Crosslinking agent is added to the mixture and mixed and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and mixed and stirred evenly; (v) Initiator is added to the mixture and mixed and stirred evenly, then frozen and embrittled at -20℃, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 2mm.

[0064] Example 3: The method of using elastic gel particles includes the following steps:

[0065] S1. First batch preparation: (a) First add 28m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 35 r / min, and control the mixing time to 13 min; (ii) Add 1.75 tons of bentonite, 3.5 tons of formation pressure enhancer, 3.5 tons of composite plugging agent and 1.75 tons of cottonseed hulls in sequence using a jet funnel, and control the addition time to 6 min; (iii) Add 1.27 tons of elastic gel particles, and control the addition time to 2 min. After the addition is completed, pump it all into the well.

[0066] S2, Second batch preparation: (a) First add 25m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 35 r / min, and control the mixing time to 13 min; (ii) Add 1.5 tons of bentonite, 2.5 tons of formation pressure enhancer, 2.5 tons of composite plugging agent and 1.5 tons of cottonseed hulls in sequence using a jet funnel, and control the addition time to 6 min; (iii) Add 1.5 tons of elastic gel particles, and control the addition time to 2 min. After the addition is completed, close the well sealer and use a mud pump valve to pump the entire amount into the well. At this time, the plugging slurry is obtained in the well.

[0067] S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 5 MPa.

[0068] S4. Secondary mud displacement: After pulling the drill string to 300 meters, shut off the wellhead again and use a mud pump to pump mud into the well for 10 meters. 3 ;

[0069] S5. Wait two hours before drilling begins;

[0070] The raw materials for preparing the elastic gel particles, by weight, include: 40 parts cationic polyacrylamide, 22 parts high-viscosity methyl cellulose, 16 parts crosslinking agent, 8 parts 2-acrylamido-2-methylpropanesulfonic acid, 22 parts bentonite, 7 parts surface treatment agent, 7 parts initiator, and 13 parts thermal conductivity rapid equalization agent.

[0071] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 7 parts modified boron nitride nanosheets, 8 parts sisal fiber, 6 parts thermally conductive ceramic fragments, and 60 parts anti-degradation agent.

[0072] The raw materials for preparing the anti-variant include: 20 parts aluminum sol, 3 parts waterborne acrylic resin, 3 parts waterborne polyurethane resin, 7 parts co-solvent, 6 parts KH-560 silane coupling agent, and 4 parts tetramethylammonium hydroxide.

[0073] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 12%, stir the two together, control the stirring speed at 500 r / min, and control the stirring time at 6 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 1.2%, heat to 62℃, control the stirring speed at 700 r / min, and control the stirring time at 22 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 6.0, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 400 r / min, control the stirring time at 70 min, and control the stirring temperature at 50℃ to obtain the anti-mutation agent;

[0074] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 10 MPa, break the epidermis and remove 40% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 1 hour, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 5 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO4 solution for 30 minutes, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0075] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.3 mm;

[0076] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 40 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 130℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 3 h and 860℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0077] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and stirred evenly; (iii) Crosslinking agent is added to the mixture and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and stirred evenly; (v) Initiator is added to the mixture and stirred evenly, then frozen at -20℃ for embrittlement, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 3 mm.

[0078] Comparative Example 1: The method of using elastic gel particles includes the following steps:

[0079] S1. First batch preparation: (a) First add 27.5m to the mixing tank. 3 (i) Use clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 22 r / min, and control the mixing time to 11 min; (ii) Use a jet funnel to add 1.375 tons of bentonite, 2.75 tons of formation pressure enhancer, 2.75 tons of composite plugging agent and 1.375 tons of cottonseed hulls in sequence, and control the addition time to 5 min; (iii) Add 1.135 tons of elastic gel particles, and control the addition time to 1.5 min. After the addition is completed, pump it all into the well. At this time, the plugging slurry is obtained in the well.

[0080] S2, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 3 MPa.

[0081] S3, Secondary Mud Replacement: After pulling the drill string 300 meters, shut off the wellhead again and use a mud pump to pump mud into the well for 10 meters. 3 ;

[0082] S4. Wait two hours before drilling begins;

[0083] The raw materials for preparing the elastic gel particles, by weight, include: 35 parts cationic polyacrylamide, 20 parts high-viscosity methyl cellulose, 15 parts crosslinking agent, 6 parts 2-acrylamido-2-methylpropanesulfonic acid, 20 parts bentonite, 5 parts surface treatment agent, 5 parts initiator, and 11 parts thermal conductivity rapid equalization agent.

[0084] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 5 parts modified boron nitride nanosheets, 6 parts sisal fiber, 4 parts thermally conductive ceramic fragments, and 45 parts anti-degradation agent.

[0085] The raw materials for preparing the anti-variant include: 17 parts aluminum sol, 2 parts waterborne acrylic resin, 2 parts waterborne polyurethane resin, 5 parts co-solvent, 4 parts KH-560 silane coupling agent, and 2 parts tetramethylammonium hydroxide.

[0086] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 10%, stir the two together, control the stirring speed at 400 r / min, and control the stirring time at 5 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 1%, heat to 58-62℃, control the stirring speed at 600 r / min, and control the stirring time at 20 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 5.7, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 300 r / min, control the stirring time at 60 min, and control the stirring temperature at 45℃ to obtain the anti-mutation agent;

[0087] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 7 MPa, break the epidermis and remove 35% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.7 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 4 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO4 solution for 24 min, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0088] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.2 mm;

[0089] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 35 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 120℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 2 h and 850℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0090] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and mixed and stirred evenly; (iii) Crosslinking agent is added to the mixture and mixed and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and mixed and stirred evenly; (v) Initiator is added to the mixture and mixed and stirred evenly, then frozen and embrittled at -20℃, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 2mm.

[0091] Comparative Example 2: The method of using elastic gel particles includes the following steps:

[0092] S1. Preparation of the first batch: (i) Add 27.5 m3 of clean water to the mixing tank, start the mixer, control the mixing speed of the mixing tank on the mixer to 22 r / min, and control the mixing time to 11 min; (ii) Use a jet funnel to add 1.375 tons of bentonite, 2.75 tons of formation pressure enhancer, 2.75 tons of composite plugging agent, and 1.375 tons of cottonseed hulls in sequence, and control the addition time to 5 min; (iii) Add 1.135 tons of elastic gel particles, and control the addition time to 1.5 min. After the addition is completed, pump it all into the well.

[0093] S2. Preparation of the second tank: (i) First, add 22.5 m3 of clean water to the mixing tank, start the mixer, control the mixing speed of the mixing tank on the mixer to 22 r / min, and control the mixing time to 11 min; (ii) Use a jet funnel to add 1.25 tons of bentonite, 2.25 tons of formation pressure enhancer, 2.25 tons of composite plugging agent, and 1.25 tons of cottonseed hulls in sequence, and control the addition time to 5 min; (iii) Add 1.25 tons of elastic gel particles, and control the addition time to 1.5 min. After the addition is completed, close the well sealer and use a mud pump valve to pump the entire amount into the well. At this time, the plugging slurry is obtained in the well.

[0094] S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 7 MPa.

[0095] S4. Secondary mud replacement: After pulling out 300 meters, shut off the wellhead again and use a mud pump to pump 10m3 of mud replacement into the well.

[0096] S5. Wait two hours before drilling begins;

[0097] The raw materials for preparing the elastic gel particles, by weight, include: 35 parts cationic polyacrylamide, 20 parts high-viscosity methyl cellulose, 15 parts crosslinking agent, 6 parts 2-acrylamido-2-methylpropanesulfonic acid, 20 parts bentonite, 5 parts surface treatment agent, 5 parts initiator, and 11 parts thermal conductivity rapid equalization agent.

[0098] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 5 parts modified boron nitride nanosheets, 6 parts sisal fiber, 4 parts thermally conductive ceramic fragments, and 45 parts anti-degradation agent.

[0099] The raw materials for preparing the anti-variant include: 17 parts aluminum sol, 2 parts waterborne acrylic resin, 2 parts waterborne polyurethane resin, 5 parts co-solvent, 4 parts KH-560 silane coupling agent, and 2 parts tetramethylammonium hydroxide.

[0100] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 10%, stir the two together, control the stirring speed at 400 r / min, and control the stirring time at 5 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 1%, heat to 58-62℃, control the stirring speed at 600 r / min, and control the stirring time at 20 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 5.7, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 300 r / min, control the stirring time at 60 min, and control the stirring temperature at 45℃ to obtain the anti-mutation agent;

[0101] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 7 MPa, break the epidermis and remove 35% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.7 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 4 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO4 solution for 24 min, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0102] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.2 mm;

[0103] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 35 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 120℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 2 h and 850℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0104] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and mixed and stirred evenly; (iii) Crosslinking agent is added to the mixture and mixed and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and mixed and stirred evenly; (v) Initiator is added to the mixture and mixed and stirred evenly, then frozen and embrittled at -20℃, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 2mm.

[0105] Comparative Example 3: The method of using elastic gel particles includes the following steps:

[0106] S1. The elastic gel particles are pumped into the well using a mud pump valve. At this time, the well is filled with plugging slurry.

[0107] S2, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled at 3 MPa.

[0108] S3, Secondary mud replacement: After pulling out 300 meters, shut off the wellhead again and use a mud pump to pump 10m3 of mud replacement into the well;

[0109] S4. Wait two hours before drilling begins;

[0110] The raw materials for preparing the elastic gel particles, by weight, include: 35 parts cationic polyacrylamide, 20 parts high-viscosity methyl cellulose, 15 parts crosslinking agent, 6 parts 2-acrylamido-2-methylpropanesulfonic acid, 20 parts bentonite, 5 parts surface treatment agent, 5 parts initiator, and 11 parts thermal conductivity rapid equalization agent.

[0111] The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 5 parts modified boron nitride nanosheets, 6 parts sisal fiber, 4 parts thermally conductive ceramic fragments, and 45 parts anti-degradation agent.

[0112] The raw materials for preparing the anti-variant include: 17 parts aluminum sol, 2 parts waterborne acrylic resin, 2 parts waterborne polyurethane resin, 5 parts co-solvent, 4 parts KH-560 silane coupling agent, and 2 parts tetramethylammonium hydroxide.

[0113] The specific steps for preparing the anti-mutation agent are as follows: (i) Take waterborne acrylic resin with a solid content of 40%, add co-solvent with a total resin content of 10%, stir the two together, control the stirring speed at 400 r / min, and control the stirring time at 5 min; (ii) Add KH-560 silane coupling agent with a total resin mass of 1%, heat to 58-62℃, control the stirring speed at 600 r / min, and control the stirring time at 20 min; (iii) Slowly add waterborne polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to aluminum sol with a solid content of 20%, adjust the pH to 5.7, and obtain modified aluminum sol; (v) Pour the modified aluminum sol into the homogeneous premix and stir, control the stirring speed at 300 r / min, control the stirring time at 60 min, and control the stirring temperature at 45℃ to obtain the anti-mutation agent;

[0114] The specific steps for preparing sisal fiber are as follows: (i) Place sisal leaves in a roller press, control the pressing pressure to 7 MPa, break the epidermis and remove 35% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.7 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating sisal cage, control the rotation speed to 4 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire sisal cage in FeSO4 solution for 24 min, and remove it; (vi) Remove the leaves from the sisal cage, rinse them with pure water, and dry them to obtain sisal fiber;

[0115] The specific steps for preparing thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.2 mm;

[0116] The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) Immerse modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments in an anti-modification agent for 35 min; (ii) Remove the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-modification agent and place them in an environment at 120℃ for curing; (iii) After curing, calcine the cured modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments for 2 h and 850℃. After cooling, a uniform 200 nm coating is formed on the surface of the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments; (iv) Mix and stir the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments with the coating to obtain the thermal conductivity rapid equalization agent.

[0117] The specific steps for preparing elastic gel particles are as follows: (i) Cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are heated to dissolve, and the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid are mixed and stirred evenly to obtain a mixture; (ii) Thermal conductivity rapid equalization agent, bentonite and high viscosity methyl cellulose are added to the mixture and mixed and stirred evenly; (iii) Crosslinking agent is added to the mixture and mixed and stirred evenly; (iv) Surface treatment agent is added dropwise to the mixture and mixed and stirred evenly; (v) Initiator is added to the mixture and mixed and stirred evenly, then frozen and embrittled at -20℃, and then put into a crushing-sieving machine for granulation to obtain elastic gel particles with a diameter of 2mm.

[0118] 2.1 Impact of mud pump pressure control and dual-tank mixing on the success rate of large leak plugging

[0119] (1) In accordance with SY / T 5840-2007 "Indoor Test Method for Bridging and Plugging Materials for Drilling Fluids", the percentage of reduction in current leakage to initial leakage was tested for the application methods of elastic gel particles in Examples 1-3 and Comparative Examples 1-2.

[0120] The results are shown in the table below:

[0121] Group Present leakage amount (%) Example 1 8.2 Example 2 4.3 Example 3 6.1 Comparative Example 1 9.3 Comparative Example 2 9.85 Comparative Example 3 9.88

[0122] As can be seen from the table above, Example 2 has the best large leak plugging effect compared with Examples 1, 2 and Comparative Examples 1-2. The effective control of the plugging slurry by preparing it in two tanks and pumping it with a mud pump resulted in the lowest percentage of the current leakage amount being reduced to the initial leakage amount. The synergistic sealing of bentonite, elastic gel particles, composite plugging agent and cottonseed hulls prevented the single gel or rigid particles from being easily diluted, thus achieving the effect of improving the success rate of large leak plugging.

[0123] 2.2 Effect of thermal conductivity rapid equalization agent on the internal temperature of elastic gel particles

[0124] (1) The preparation method of elastic gel particles is the same as in Example 2, except that the thermal conductivity rapid equalizer described in the table below is used instead of the thermal conductivity rapid equalizer in Example 2.

[0125] The raw material composition of natural plant gum powder is shown in the table below:

[0126] Group Sisal fiber / portion Thermally conductive ceramic chips / portion Example 2 6 4 Comparative Example 4 - 10 Comparative Example 5 10 -

[0127] Note: "-" indicates no addition.

[0128] (2) The internal temperature of the elastic gel particles was tested using the following test method.

[0129] 1) Experimental materials: 30 containers (length 10cm * width 10cm * height 10cm);

[0130] 30 thermocouple thermometers;

[0131] ① Pour 500ml of water (at a temperature of 60℃) into each of 30 containers and use a heater to maintain the water temperature at a constant 60℃.

[0132] ② Ten elastic gel particles were prepared from each of the methods of Example 2 and Comparative Examples 4-5. The elastic gel particles prepared by the method of Example 2 were labeled as "1", the elastic gel particles prepared by the method of Comparative Example 4 were labeled as "2", and the elastic gel particles prepared by the method of Comparative Example 5 were labeled as "3".

[0133] ③ Using a thermocouple thermometer, insert the small probe of the thermocouple thermometer into the center of each elastic gel particle, record the temperature rise at the center of each elastic gel particle, and record the average value as shown in the table below:

[0134] Group 5s(℃) 10s(℃) 30s(℃) 60s(℃) 2 min (°C) Example 2 40 60 60 60 60 Comparative Example 4 37 44 50 54 60 Comparative Example 5 35 40 49 51 60

[0135] 2) The expansion rate and expansion time of the elastic gel particles prepared in Example 2 and Comparative Examples 4-5 were tested according to Q / SY 17002-2016 "Technical Specification for Water-Absorbing and Expanding Granules for Profile Control and Water Plugging". The results are shown in the table below:

[0136] Group Swelling ratio Swelling time Example 2 19 30s Comparative Example 4 10 60s Comparative Example 5 11 60s

[0137] As can be seen from the two tables above, Example 2 is the best compared with Comparative Examples 4-5, with the largest expansion rate and the shortest expansion time. By using a thermal conductivity rapid equalization agent prepared from modified boron nitride nanosheets, sisal fibers, thermally conductive ceramic fragments and anti-deformation agents, it achieves the effect of rapid heat conduction inside the elastic gel particles, thereby achieving the maximum expansion rate of the elastic gel particles in a short time, which helps to quickly seal the crack leakage layer.

[0138] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method of using elastic gel particles, characterized in that, The method of using the elastic gel particles includes the following steps: S1. First batch preparation: (a) First add 27-28m to the mixing tank. 3 (i) Add clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 19.5-35 r / min, and control the mixing time to 10-13 min; (ii) Add 1-1.75 tons of bentonite, 2-3.5 tons of formation pressure enhancer, 2-3.5 tons of composite plugging agent and 1-1.75 tons of cottonseed hulls in sequence using a jet funnel, and control the addition time to 4-6 min; (iii) Add 1-1.27 tons of elastic gel particles, and control the addition time to 1-2 min. After the addition is completed, pump it all into the well. S2, Second batch preparation: (a) First add 20-25m to the mixing tank. 3 (i) Use clean water, start the mixer, control the mixing speed of the mixing tank on the mixer to 19.5-35 r / min, and control the mixing time to 10-13 min; (ii) Use a jet funnel to add 1-1.5 tons of bentonite, 2-2.5 tons of formation pressure enhancer, 2-2.5 tons of composite plugging agent, and 1-1.5 tons of cottonseed hulls in sequence, and control the addition time to 4-6 min; (iii) Add 1-1.5 tons of elastic gel particles, and control the addition time to 1-2 min. After the addition is completed, close the well sealer and use a mud pump to pump the entire amount into the well. At this time, the plugging slurry is obtained in the well. S3, Primary mud replacement: The drilling fluid is used to replace the plugging mud in the drill pipe by a mud pump, and the pump pressure is controlled to be ≤5 MPa; S4. Secondary mud displacement: After pulling the drill string to 300 meters, shut off the wellhead again and use a mud pump to pump mud into the well for 10 meters. 3 ; S5. Wait two hours before drilling begins.

2. The method of using the elastic gel particles according to claim 1, characterized in that, in, The raw materials for preparing the elastic gel particles, by weight, include: 30-40 parts cationic polyacrylamide, 18-22 parts high-viscosity methyl cellulose, 14-16 parts crosslinking agent, 5-8 parts 2-acrylamido-2-methylpropanesulfonic acid, 18-22 parts bentonite, 3-7 parts surface treatment agent, 3-7 parts initiator, and 9-13 parts thermal conductivity rapid equalization agent.

3. The method of using the elastic gel particles according to claim 2, characterized in that, in, The raw materials for preparing the thermal conductivity rapid equalization agent, by weight, include: 3-7 parts modified boron nitride nanosheets, 2-8 parts sisal fiber, 3-6 parts thermally conductive ceramic fragments, and 30-60 parts anti-degradation agent.

4. The method of using the elastic gel particles according to claim 3, characterized in that, in, The raw materials for preparing the anti-variant include: 15-20 parts aluminum sol, 1-3 parts waterborne acrylic resin, 1-3 parts waterborne polyurethane resin, 3-7 parts co-solvent, 3-6 parts KH-560 silane coupling agent, and 1-4 parts tetramethylammonium hydroxide.

5. The method of using the elastic gel particles according to claim 4, characterized in that, The specific steps for preparing the anti-mutation agent are as follows: (i) Take an aqueous acrylic resin with a solid content of 40%, add a co-solvent of 8-12% of the total resin content, stir the two together, control the stirring speed at 300-500 r / min, and control the stirring time at 4-6 min; (ii) Add KH-560 silane coupling agent of 0.8-1.2% of the total resin mass, heat to 58-62℃, control the stirring speed at 500-700 r / min, and control the stirring time at 18-22 min; (iii) Slowly add aqueous polyurethane resin, and simultaneously disperse it with ultrasonication at 40 kHz for 10 min to obtain a homogeneous premix; (iv) Add 0.5% tetramethylammonium hydroxide to an aluminum sol with a solid content of 20%, adjust the pH to 5.5-6.0, and obtain a modified aluminum sol. (v) Pour the modified aluminum sol into the homogeneous premixed liquid and stir. Control the stirring speed to 200-400 r / min, the stirring time to 50-70 min, and the stirring temperature to 40-50℃ to obtain the anti-mutation agent.

6. The method of using the elastic gel particles according to claim 3, characterized in that, The specific steps for preparing the sisal fiber are as follows: (i) Place the sisal leaves in a roller press, control the pressing pressure to 5-10 MPa, break the epidermis and remove 30-40% of the juice to obtain sap-drained sisal leaves; (ii) Place the sap-drained sisal leaves in pure water and heat to boiling, maintain for 0.5-1 h, and remove the boiled leaves; (iii) Rinse the boiled leaves to remove the gum, and obtain degummed sisal; (iv) Feed the degummed sisal into a rotating cage, control the rotation speed to 3-5 r / min, and use the mechanical feet of the threshing machine to compact the fiber; (v) Immerse the entire cage in FeSO4 solution for 15-30 min, and remove it; (vi) Remove the leaves from the cage, rinse them with pure water, and dry them to obtain sisal fiber.

7. The method of using the elastic gel particles according to claim 3, characterized in that, The specific steps for preparing the thermally conductive ceramic fragments are as follows: the thermally conductive ceramic is crushed using a crusher to obtain thermally conductive ceramic fragments with a diameter of 0.1-0.3 mm.

8. The method of using the elastic gel particles according to claim 3, characterized in that, The specific preparation steps of the thermal conductivity rapid equalization agent are as follows: (i) immersing modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments into the anti-degradation agent, controlling the immersion time to be 30-40 min; (ii) removing the modified boron nitride nanosheets, sisal fibers, and thermally conductive ceramic fragments from the anti-degradation agent and placing them in an environment with a temperature of 110-130℃ for curing. (III) After curing, the cured modified boron nitride nanosheets, sisal fibers and thermally conductive ceramic fragments are calcined, with the calcination time controlled at 1-3h and the calcination temperature controlled at 840-860℃. After cooling, a uniform coating of 200nm is formed on the surface of the modified boron nitride nanosheets, sisal fibers and thermally conductive ceramic fragments; (IV) The modified boron nitride nanosheets, sisal fibers and thermally conductive ceramic fragments with the coating on the surface are mixed and stirred to obtain a rapid thermal conductivity equalization agent.

9. The method of using the elastic gel particles according to claim 2, characterized in that, The specific steps for preparing the elastic gel particles are as follows: (i) heating cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid to dissolve, and mixing the dissolved cationic polyacrylamide and 2-acrylamido-2-methylpropanesulfonic acid evenly to obtain a mixture; (ii) adding thermal conductivity equalizer, bentonite and high viscosity methylcellulose to the mixture and mixing evenly; (iii) adding crosslinking agent to the mixture and mixing evenly; (iv) adding surface treatment agent dropwise to the mixture and mixing evenly; (v) adding initiator to the mixture and mixing evenly, then freezing and embrittlement at -20℃, and then granulating in a pulverizing-screening machine to obtain elastic gel particles with a diameter of 1-3 mm.