39results about How to "High resistance reduction rate" patented technology

The invention discloses an acid liquor friction reducer and a preparation method thereof. According to the invention, the preparation method comprises the following steps: weighing monomer 2-acrylamide-2-methylpro panesulfonic acid; placing into a beaker; adding deionized water for dissolution; adding caustic soda flakes to adjust to the pH value of the system to be 8-10; adding monomer acrylamide and long-chain cation monomer; mixing under the condition of supplying an inert gas; adjusting the water bath temperature to be the initiation reaction temperature and adding an initiator; reacting to obtain transparent gelatin blocks; manually cutting the transparent gelatin blocks; drying, smashing, and screening with 100 mesh to obtain powdered acid liquor friction reducer. According to the invention, the synthesis method is simple, the raw materials are easy to obtain, and the cost is lowered; the acid liquor friction reducer prepared by the invention has a friction reducing rate as high as 65%, the pump pressure is reduced, the pipe line loss is reduced, and the service life of equipment is prolonged; the acid liquor friction reducer is good in temperature tolerance and compatibility, and has a certain speed reducing effect.

The invention discloses a suspension emulsion type slick water friction reducing agent and a preparation method thereof. The suspension emulsion type slick water friction reducing agent is composed of, by weight part, 35-55 parts of white oil, 0.5-3.5 parts of stabilizer, 0.5-2.5 parts of rheological modifier, 25-55 parts of polyacrylamide powder, 2.5-55 parts of emulsifier and 0.2-0.6 part of preservatives. The prepared suspension emulsion type slick water friction reducing agent has the advantages of being high in dissolving speed, friction reducing rate and compatibility, low in consumption, simple in process and the like. Compared with the prior art, the polyacrylamide powder and the white oil are simultaneously applied to the suspension emulsion type slick water friction reducing agent to increase the system dispersion effects, the solid content of the suspension emulsion type slick water friction reducing agent and the system dissolving speed, and meanwhile to reduce the production and transportation costs; the emulsifier and the preservatives are introduced to ensure good appearance and a long storage period of the suspension emulsion type slick water friction reducing agent, which accordingly is better applied to industrial production.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, a cationic monomer containing a double bond, an anionic polymer template, a chelating agent and a molecular weight regulating agent with water with pH value being regulated to obtain a water solution of which the pH value is 3-5; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the anionic polymer template is less than 800000, and the structure formula of the anionic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

The invention provides a method for volume acid-fracturing reformation of a seam net of a carbonate reservoir. The method specifically comprises the following steps: (1) injecting low-viscose resistance-reducing sliding acid liquor, performing plunger injection for at least three times and performing volume fracturing reformation of the seam net; (2) injecting a water-based sand-carrying fracturing fluid and forming sand-filling cracks in length not less than 120 meters on the two sides of a well shaft; (3) injecting a displacement fluid, closing the well and then draining the liquid, wherein the low-viscose resistance-reducing sliding acid liquor is composed of 5-20% of acid, 1-3% of alkyl quaternary ammonium salt, 0.5-2% of sodium ascorbate, 0.1-0.5% of emulsion corrosion inhibitor, 0.5-1% of citric acid, 1-3% of discharge aiding agent and the balance of water; the emulsion corrosion inhibitor is selected from any one of polypropylene glycol emulsion, polyvinylpyrrolidone emulsion, acrylamide and 2-crylic acid-2-methallyl sulfonate copolymer emulsion; and the acid is selected from hydrochloric acid, formic acid, acetic acid or bionic acid. The method is simple in construction, the flow conductivity of the seam net is high and the yield-increasing effect is excellent.

The invention provides a resistance reducing agent, a resistance reducing solution containing the resistance reducing agent, and an application of the resistance reducing solution, and belongs to the field of a gas well fracturing agent. The resistance reducing agent is prepared from acrylamide, an ester monomer A, and a cationic monomer B according to a molar ratio of (1-4):0.5:(0.5-1) through random copolymerization of inverse emulsion polymerization, wherein the ester monomer A is a specific esterification product prepared from methacrylic acid and / or acrylic acid and glycerol; the cationic monomer B is allyltrimethylammonium chloride or methacrylatoethyl trimethyl ammonium chloride; and the obtained copolymer has a viscosity average molecular weight being 5*10<5>-8*10<5>. The resistance reducing solution containing the resistance reducing agent is high in resistance reducing efficiency. The resistance reducing agent is degradable, thereby causing no damage to a reservoir stratum.

The invention relates to a hydrophobically associating polymer for shale gas exploitation and a preparation method thereof and an application of the hydrophobically associating polymer as a drag reducer in shale gas exploitation and is mainly used for solving the problem of low drag reduction rate of the polymers in the prior art. The hydrophobically associating polymer for shale gas exploitation is prepared from the following mixtures in parts by mass through free radical polymerization: a) 100 parts of acrylamide; b) 0-60 parts of free radical polymerization anion monomer; c) 0.1-60 parts of free radical polymerization hydrophobic monomer; and d) 200-2,000 parts of water; and the technical problem is solved relatively well by the technical scheme, and the hydrophobically associating polymer can be used as a drag reducer in shale gas exploitation.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, an anionic monomer containing a double bond, a cationic polymer template, a dispersing agent, a molecular weight regulating agent and inorganic salts with water with pH value being regulated to obtain a water solution of which the pH value is 4-7; and (2) under an inert atmosphere, contacting the water solution with an initiator in batches and performing a polymerization reaction. The molecular weight of the cationic polymer template is less than 1000000, and the structure formula of the cationic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is low in formation damage property, is high in inhibition on clay expansion, is good in water solubility and is green and environment-friendly.

The invention discloses an alcohol-soluble slickwater system for fracturing as well as a preparation method and application of the alcohol-soluble slickwater system, and relates to the technical fieldof acid fracturing agents. The slickwater system is composed of the following components in percentage by weight: 20.0-60.0% of a polyacrylamide polymer, 0.5-4.0% of nano particles, 0.1-3% of a surfactant, and the balance of organic alcohol.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide monomer, a nonionic-series monomer having a hydroxyl group and containing a double bond, a polyhydroxyl nonionic polymer template, a chelating agent and a molecular weight regulating agent with water to obtain a water solution; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the polyhydroxyl nonionic polymer template is less than 500000, and the structure formula of the polyhydroxyl nonionic polymer template is represented as the formula (I) or the formula (II). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, a cationic monomer containing a double bond, an anionic polymer template, a dispersing agent, a molecular weight regulating agent and inorganic salts with water with pH value being regulated to obtain a water solution of which the pH value is 3-6; and (2) under an inert atmosphere, contacting the water solution with an initiator in batches and performing a polymerization reaction. The molecular weight of the anionic polymer template is less than 800000, and the structure formula of the anionic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is low in formation damage property, is high in inhibition on clay expansion, is good in water solubility and is green and environment-friendly.

The invention discloses an acid liquid drag reducer and a preparation method thereof. The preparation method comprises the following steps: weighing 2-acrylamido-2-methylpropane sulfonic acid monomers in a beaker; adding water for dissolution, and adjusting the system pH value to be 8-10; adding acrylamide monomers and long chain cation monomers; performing stirring under the condition that an inert gas is pumped therein; adjusting the bath temperature to be an initiation reaction temperature, after that, adding an initiator, and enabling a reaction to prepare a transparent gum block; at last, manually cutting the transparent gum block into pieces; performing drying and crushing; and performing screening by use of a 100-mesh screen to prepare the powdery acid liquid drag reducer. The synthetic method is simple, the raw materials are easily accessible, and the cost is lowered; the prepared acid liquid drag reducer has the drag reduction rate up to 65%, pumping pressure and pipeline loss are reduced, and the equipment service life is prolonged; and the acid liquid drag reducer is good in temperature resistance and compatibility, and meanwhile, has a certain retarding effect.

The invention relates to an environment-friendly drag reducing agent for fracturing, and a preparation method thereof, wherein the environment-friendly drag reducing agent comprises, by weight, 0.1-17parts of a gemini quaternary ammonium salt, 8-55 parts of fatty alcohol polyoxyethylene ether, 0.4-0.7 part of a polyoxyethylene resin, 1.4-50 parts of sulfonate, 1.4-5.0 parts of a nonionic naturalcarboxylate surfactant, 0.2-2.5 parts of a cloud point inhibitor, 0.5-2.4 parts of an anion-cation phase transfer agent and 5-90 parts of water. According to the invention, the environment-friendly drag reducing agent is non-toxic and harmless to the environment and people, meets the national environmental protection policy, and has advantages of ultralow surface and interface tension, suitabilityfor slickwater hydraulic fracturing, sterilization function, storage stability, convenient use and the like.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, a nonionic-series monomer having a hydroxyl group and containing a double bond, a polyhydroxyl nonionic polymer template, a dispersing agent, a molecular weight regulating agent and inorganic salts with water to obtain a water solution; and (2) under an inert atmosphere, contacting the water solution with an initiator in batches and performing a polymerization reaction. The molecular weight of the polyhydroxyl nonionic polymer template is less than 500000, and the structure formula of the polyhydroxyl nonionic polymer template is represented as the formula (I) or the formula (II). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is low in formation damage property, is high in inhibition on clay expansion, is good in water solubility and is green and environment-friendly.

The invention discloses an earth electrode installation method and an earth electrode. The earth electrode installation method comprises measuring the diagonal line value of a horizontal ground network, intercepting an earth electrode by a length of 1.1 to 1.3 times of the diagonal line value, inserting one end of the earth electrode into the ground at a certain inclination angle, and connecting the other end of the earth electrode to a horizontal power network, wherein the inclination angle is an included angle between the earth electrode and the horizontal surface of the horizontal power network, and the scope of the inclination angle is from 30 degrees to 60 degrees. According to the scheme provided by the invention, through measuring the diagonal line value of the horizontal ground network, the earth electrode is intercepted by the length of 1.1 to 1.3 times of the diagonal line value, and the obtained earth electrode is inserted into the ground at the inclination angle of 30 degrees to 60 degrees, such that the earthing resistance of an earthing network is greatly reduced, and the operation safety of the earthing network of a transformer station is improved.

The invention discloses a salt-resistant drag-reduction agent polymer, and synthetic technology thereof. The salt-resistant drag-reduction agent polymer comprises, by weight, 320-360 parts of pure water, 0.1-0.3 part of Edta-2Na, 35-45 parts of sodium bicarbonate, 18-22 parts of acrylic acid, 8-12 parts of AMPS, 75-85 parts of acrylamide, and 14-18 parts of urea. The synthetic technology is simplein operation; product quality is stable; and environment pollution influence is extremely low. The salt-resistant drag-reduction agent polymer possesses advantages such as high dissolving speed, temperature resistance, salt resistance, shearing resistance, excellent compatibleness, and high drag reduction rate, is mainly used for reduction of conveying resistance force in shale hydrocarbon reservoir and compact sandstone hydrocarbon reservoir pressing crack construction and other fluid pipelines, enlarging discharge amount, and reducing power consumption.

The invention discloses a crude oil composite demulsifier and a preparation method thereof; the demulsifier comprises the following substances: 1000 parts of water, 40 to 50 parts of triethanolamine;350 to 450 parts of epoxypropane, 250 to 400 parts of ethylene oxide, 80 to 100 parts of acrylic acid, 50 to 60 parts of sulfonic acid perfluoroalkyl surfactant, 70 to 120 parts of alkyl alcohol polyoxyethylene ether sulfonate, 50 to 100 parts of citrate, 10 to 60 parts of inorganic base and 300 to 400 parts of organic solvent. The preparation method comprises the following steps: sequentially adding triethanolamine, propylene oxide and ethylene oxide for copolymerization to generate polyether, adding acrylic acid for reaction to obtain modified polyether, and dissolving the modified polyetherin an organic solution for later use; sequentially adding citrate, a sulfonic acid perfluoroalkyl surfactant and alkyl alcohol polyoxyethylene ether sulfonate into water; and adding the modified polyether solution into the mixed solution, adding inorganic base, and continuously stirring. The crude oil composite demulsifier provided by the invention not only has good demulsification performance oncrude oil, but also can provide good viscosity reduction performance and resistance reduction performance.

The invention provides a reusable resistance diminishing water system. Te reusable resistance diminishing water system is prepared from the following components in parts by mass: 0.2 to 1.5 parts of aresistance diminishing agent, 0 to 1 part of a regulating agent and the balance of solution preparation water. Compared with conventional resistance diminishing water, the reusable resistance diminishing water system provided by the invention is better in water hardness, putrefying bacteria tolerance, acid-base adaptation, saltness, sand carrying ability and the like, and has the characteristicsof strong water adaptation, low friction, low damage, high swelling resistance and high emission assistance; by adopting reusable resistance diminishing water, online blending construction can be realized, solution preparation in advance and continuous blending equipment are omitted, and a larger popularization and application prospect is obtained.

The invention relates to a plant gum containing a sulfonic acid group; the sulfonic acid group is located on arbitrary hydroxyl sites of galactomannan and derivatives thereof, the galactomannan and the derivatives thereof are selected from at least one of guar gum, fenugreek gum, sesbania gum, hydroxypropyl guar gum, carboxymethyl hydroxypropyl guar gum, hydroxypropyl fenugreek gum, carboxymethyl fenugreek gum and hydroxyethyl sesbania gum, and the degree of substitution of the sulfonic acid group is 0.20-0.80. The invention also provides a preparation method of the plant gum containing the sulfonic acid group. A fracturing fluid prepared by the plant gum containing the sulfonic acid group has good viscoelasticity.

The invention discloses a resistance reducing agent and a preparation method thereof, and belongs to the technical field of oil and gas field fracturing. The synthetic raw materials of the resistancereducing agent comprise the following components in parts by mass: 60-95 parts of acrylamide and 1-5 parts of alkyl polyethylene glycol acrylate. The synthetic raw materials of the resistance reducingagent further comprise at least one of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid or sodium p-styrenesulfonate, and the balance of water. The synthetic raw materials of the resistance reducing agent are all water-soluble monomers, and the formed resistance reducing agent also has good water solubility and can be rapidly dissolved in water. Therefore, when the resistance reducing agent is prepared, only water needs to be added as a solvent, other oil phases, emulsifiers or cosolvents do not need to be used, the preparation method is simple and easy to operate, and the preparationcost of the resistance reducing agent is reduced. Moreover, the resistance reducing agent is good in stability and high in resistance reducing rate, the acid fracturing operation efficiency can be improved, and the purpose of increasing the yield of the shale gas reservoir is achieved.

The invention discloses a drag reducing agent and a preparation method thereof, belonging to the technical field of oil and gas field fracturing. The synthetic raw material of the drag reducing agent includes the following components in parts by mass: 60-95 parts by mass of acrylamide, 1-5 parts by mass of alkyl polyethylene glycol acrylate; the synthetic raw material of the drag reducing agent also includes : At least one of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid or sodium p-styrenesulfonate, the balance being water; the synthetic raw materials of the drag reducer are all water-soluble monomers, and the formed drag reducer The resist also has good water solubility and can dissolve quickly in water. Therefore, the drag reducer only needs to add water as a solvent during preparation, and does not need to use other oil phases, emulsifiers or co-solvents, the preparation method is simple and easy to operate, and the preparation cost of the drag reducer is reduced. Moreover, the drag reducing agent has good stability and a high drag reducing rate, can improve the efficiency of acid fracturing operations, and achieve the purpose of increasing production of shale gas reservoirs.

The invention relates to a preparation method of a drag reducing agent for fracturing, comprising: mixing an acrylamide monomer, a cationic monomer containing a double bond, an anionic polymer template, a chelating agent, a molecular weight regulator and water and adjusting the pH value , to obtain an aqueous solution with a pH value of 3-5; the organic solvent is contacted with an emulsifier to obtain an oil solution; the aqueous solution is contacted with the oil solution to obtain a water-in-oil emulsion; under an inert atmosphere, the oil-in- The aqueous emulsion is contacted with the initiator in batches, and a polymerization reaction is carried out, and then the mixture obtained by the polymerization reaction is contacted with a phase inversion agent; wherein, the hydrophilic-lipophilic balance value of the emulsifier is 4-6, and the anionic polymer The molecular weight of the template is less than 800,000, and the structural formula of the anionic polymer template is shown in formula (I), and also relates to a drag reducing agent for fracturing prepared by the above method. The drag-reducing agent for fracturing prepared by the invention has high drag-reducing rate, high clay swelling inhibition, good water solubility and low stratum damage.

The invention belongs to the technical field of distribution networks, particularly relates to a preparation method of an anticorrosion distribution network grounding device, and provides the preparation method of the anticorrosion distribution network grounding device. The buried grounding body is welded by using the E309-15 type alkaline welding rod. Resistance reduction of the buried grounding body is performed by using a resistance reducing agent, wherein the resistance reducing agent includes methyl benzotriazole. According to the preparation method of the anticorrosion distribution network grounding device, the technical problems that the existing grounding device has low service life and is liable to cause grounding hidden dangers can be solved.

The invention discloses a fracturing fluid and a preparation method thereof, belonging to the technical field of fracturing. The fracturing fluid includes the following components in mass percentage: 0.5%-4% of surfactant, 0.15%-2.5% of counter ion salt, 0.01%-2% of clay stabilizer, and the balance is water; the surfactant is composed of allyl Prepared by the quaternization reaction of alkyl halides and alkyldimethyl tertiary amines; the counter ion salt is phenylsulfonate. The surfactant used in the fracturing fluid is prepared by quaternization reaction of allyl halide and alkyl dimethyl tertiary amine, the reaction raw materials are cheap and easy to obtain, the reaction conditions are mild, and the reaction process is simple and easy to operate. The formed surfactant is simply compounded with the counter ion salt, which can form a viscoelastic fluid with high resistance reduction rate, and its synergistic effect with clay stabilizer and water, the formed fracturing fluid system can be used to treat Oil and gas wells are fractured to achieve excellent stimulation effects.

The invention relates to the technical field of resistance reducing agents, and discloses a multifunctional reversed-phase suspension resistance reducing agent system for shale gas factory-like sand fracturing fluid, which comprises an oil phase, a water-soluble monomer, a suspending agent, an initiator, a surfactant A, a surfactant B, a cleanup additive, an anti-swelling agent and clear water, the surfactant A is one or a composition of more of nonylphenol polyoxyethylene ether, span 80 and Tween; the surfactant B is one or a composition of more of alkylaryl polyoxyethylene ether and 12-hydroxystearic acid-polyoxyethylene ether; the surfactant B is one or a composition of more of alkylaryl polyoxyethylene ether and 12-hydroxystearic acid-polyoxyethylene ether; the discharge aiding agent is organic fluorocarbon; the anti-swelling agent is hexamethylenetetramine ammonium chloride. The scheme has the beneficial effects that the resistance reducing agent prepared by adopting a reversed-phase suspension polymerization method is quick in dispersion and dissolution time in water, high in viscosity and low in friction resistance, and can effectively reduce the friction resistance of fracturing construction, reduce the pumping pressure of construction and reduce the safety risk of construction at the same time; the system has discharge aiding and anti-swelling performance, and a discharge aiding agent and an anti-swelling agent do not need to be additionally pumped through a fracturing blender truck during construction.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, an anionic monomer containing a double bond, a cationic polymer template, a chelating agent and a molecular weight regulating agent with water with pH value being regulated to obtain a water solution of which the pH value is 6-9; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the anionic polymer template is less than 1000000, and the structure formula of the anionic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

The invention provides a method for volume acid-fracturing reformation of a seam net of a carbonate reservoir. The method specifically comprises the following steps: (1) injecting low-viscose resistance-reducing sliding acid liquor, performing plunger injection for at least three times and performing volume fracturing reformation of the seam net; (2) injecting a water-based sand-carrying fracturing fluid and forming sand-filling cracks in length not less than 120 meters on the two sides of a well shaft; (3) injecting a displacement fluid, closing the well and then draining the liquid, wherein the low-viscose resistance-reducing sliding acid liquor is composed of 5-20% of acid, 1-3% of alkyl quaternary ammonium salt, 0.5-2% of sodium ascorbate, 0.1-0.5% of emulsion corrosion inhibitor, 0.5-1% of citric acid, 1-3% of discharge aiding agent and the balance of water; the emulsion corrosion inhibitor is selected from any one of polypropylene glycol emulsion, polyvinylpyrrolidone emulsion, acrylamide and 2-crylic acid-2-methallyl sulfonate copolymer emulsion; and the acid is selected from hydrochloric acid, formic acid, acetic acid or bionic acid. The method is simple in construction, the flow conductivity of the seam net is high and the yield-increasing effect is excellent.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, a cationic monomer containing a double bond, an anionic polymer template, a dispersing agent, a molecular weight regulating agent and inorganic salts with water with pH value being regulated to obtain a water solution of which the pH value is 3-6; and (2) under an inert atmosphere, contacting the water solution with an initiator in batches and performing a polymerization reaction. The molecular weight of the anionic polymer template is less than 800000, and the structure formula of the anionic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is low in formation damage property, is high in inhibition on clay expansion, is good in water solubility and is green and environment-friendly.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide monomer, a nonionic-series monomer having a hydroxyl group and containing a double bond, a polyhydroxyl nonionic polymer template, a chelating agent and a molecular weight regulating agent with water to obtain a water solution; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the polyhydroxyl nonionic polymer template is less than 500000, and the structure formula of the polyhydroxyl nonionic polymer template is represented as the formula (I) or the formula (II). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

The invention relates to a composition for a water-based fracturing fluid resistance reducing agent and an application of the composition serving as a fracturing fluid resistance reducing agent. The composition is mainly used for solving the problem of a narrow application temperature range of a resistance reducing agent in the prior art. The following technical scheme is adopted in the invention to well solve the technical problem: the water-based fracturing fluid resistance reducing agent comprises the cationic surface active agent and the aromatic acid salt as shown in formula (I); the aromatic acid salt is selected from at least one of the aromatic acid salt as shown in formula (II) or formula (III); the weight ratio of the cationic surface active agent to the aromatic acid salt is 1:1 to 1:50, and the composition can be used in a shale gas fracturing mining process. The formulas are described in the specification.

The invention discloses an earth electrode installation method and an earth electrode. The earth electrode installation method comprises measuring the diagonal line value of a horizontal ground network, intercepting an earth electrode by a length of 1.1 to 1.3 times of the diagonal line value, inserting one end of the earth electrode into the ground at a certain inclination angle, and connecting the other end of the earth electrode to a horizontal power network, wherein the inclination angle is an included angle between the earth electrode and the horizontal surface of the horizontal power network, and the scope of the inclination angle is from 30 degrees to 60 degrees. According to the scheme provided by the invention, through measuring the diagonal line value of the horizontal ground network, the earth electrode is intercepted by the length of 1.1 to 1.3 times of the diagonal line value, and the obtained earth electrode is inserted into the ground at the inclination angle of 30 degrees to 60 degrees, such that the earthing resistance of an earthing network is greatly reduced, and the operation safety of the earthing network of a transformer station is improved.