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

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 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 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 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 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.