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

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 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 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 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 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 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 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 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.