13results about How to "Good viscosity increase" patented technology

The invention relates to a ring structure betaine and double-tailed hydrophobic association polymer fracturing thickening agent and a preparation method thereof. The thickening agent is formed by copolymerization of four monomers, namely acrylamide, 2-allyl methylamino sodium ethanesulfonate, methyl diallyl sulfoethyl betaine and hydrophobic monomer double-tailed long-chain alkyl methyl allyl ammonium chloride. The preparation method comprises the following steps: firstly adding distilled water, then sequentially adding acrylamide, 2-allyl methylamino sodium ethanesulfonate, methyl diallyl sulfoethyl betaine and a hydrophobic monomer double-tailed long-chain alkyl methyl allyl ammonium chloride, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, and reacting to prepare an AM / AMES / MDASBA / DCnMAAC quadripolymer, namely the polymer fracturing thickening agent. The thickening agent provided by the invention has good water solubility, and shows good salt resistance in mixed brine with the mineralization degree of greater than or equal to 30000 mg / L. The prepared linear solution and gel formed after crosslinking have high viscosity retention capacity at the temperature of 150 DEG C and the shearing rate of 170 s <-1 >, and the actual construction requirement for fracturing yield increase with the on-site mineralization degree larger than or equal to 30000 mg / L is met.

The invention provides a temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for a soil-phase-free water-based drilling fluid as well as a preparation method and application of the temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer, and belongs to the technical field of drilling. The temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for the soilless phase water-based drilling fluid comprises the following raw materials in parts by weight: N, N-dimethylformamide, a cross-linking agent and a cross-linking agent, the invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 15 to 25 parts of N, N-dimethylacrylamide, 1 to 10 parts of 3-[(3-methacrylamidopropyl) dimethylammonium] propane-1-sulfonate, 1 to 10 parts of long-chain alkyl polyoxyethylene ether methacrylate, 0.005 to 0.015 part of macromolecular cross-linking agent, 0.03 to 0.08 part of initiator A and 80 to 100 parts of deionized water. The tackifying filtrate reducer can resist the temperature of 180 DEG C, can resist NaCl to be saturated, has excellent tackifying, shear-improving and filtrate-reducing effects under high-temperature and high-salt conditions, improves the rheological property and the filtrate-reducing property of drilling fluid, and ensures safe and efficient drilling of a deep well.

The invention relates to a betaine type double-tailed hydrophobic association polymer fracturing thickening agent and a preparation method thereof. The thickening agent is prepared by the following steps: copolymerizing four monomers, namely acrylamide, 2-allyl methylamino sodium ethanesulfonate, methyl diallyl hydroxypropyl sulfobetaine and double-tailed long-chain alkyl allyl sulfoethyl betaine to form gel, chopping, hydrolyzing, neutralizing and purifying. The preparation method comprises the following steps: firstly adding distilled water, adding acrylamide, 2-allylmethylamino sodium ethanesulfonate, methyldiallyl hydroxypropyl sulfobetaine and other remaining raw materials, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, reacting to prepare gel, chopping the gel, and hydrolyzing to obtain the water-soluble polymer. The fracturing thickening agent has good water solubility and shows good salt resistance in mixed saline water with the mineralization degree larger than or equal to 30000 mg / L, a prepared linear solution and jelly formed after crosslinking have high viscosity retention capacity at the temperature of 150 DEG C and the shearing rate of 170 s <-1 >, and the actual construction requirement for fracturing yield increase with the on-site mineralization degree larger than or equal to 30000 mg / L is met.

The invention relates to a double-tailed hydrophobic associated polymer oil-displacing agent with a benzene ring structure and a preparation method thereof. The oil-displacing agent is formed by copolymerizing three monomers, namely acrylamide, 2-allyl methylamino sodium ethanesulfonate and a hydrophobic monomer double-tailed long-chain alkyl methyl (p-3-carboxyl acrylamide benzyl) ammonium chloride with the benzene ring structure. The preparation method comprises the following steps: firstly adding distilled water, then adding acrylamide, 2-allyl methylamino sodium ethanesulfonate and a hydrophobic monomer double-tailed long-chain alkyl methyl (p-3-carboxyl acrylamide benzyl) ammonium chloride with a benzene ring structure, supplementing water, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, and reacting at a certain temperature to prepare the terpolymer. The prepared polymer oil-displacing agent has good water solubility, temperature resistance and shearing resistance, shows good salt resistance in saline water with the mineralization degree larger than or equal to 30000 mg / L and shows a good oil-displacing effect in a heterogeneous core oil-displacing experiment, and the crude oil recovery rate can be increased by 10% or above.

The invention provides an acid-resistant nano polymer microsphere inclusion plugging system as well as a preparation method and application thereof. The plugging system is prepared from the following raw materials in parts by mass: 1-5 parts of acid-resistant nano polymer microspheres, 1-5 parts of an acid-resistant low-molecular-weight cyclodextrin polymer and 80-120 parts of water. According to the invention, a supramolecular construction thought is introduced, and an inclusion synergistic plugging system constructed by acid-resistant nano polymer microspheres and a cyclodextrin polymer through a host-guest inclusion effect is provided through design of a nano polymer microsphere surface molecular structure and a cyclodextrin polymer molecular structure. The plugging system disclosed by the invention is high in acid resistance and excellent in shear resistance, and the nano polymer microspheres have good dispersity and injectability and are easy to inject into a stratum to move to the deep part; and meanwhile, the plugging agent has the characteristics of low concentration and high efficiency, and can effectively enter the deep part of a stratum and efficiently plug cracks, so that the swept volume and the displacement efficiency of CO2 can be improved.

The invention relates to the field of petroleum drilling auxiliaries, in particular to a polymer, a preparation method and application thereof and a water-based drilling fluid. The polymer comprises a dendritic polyester matrix and a polymer chain segment grafted on the surface of the dendritic polyester matrix, the dendritic polyester matrix contains a structural unit A from a polyhydroxy compound, a structural unit B from monocarboxylic acid or monocarboxylic ester, and a connecting ester group; wherein the polyhydroxy compound, the monocarboxylic acid and the monocarboxylic ester respectively and independently contain more than two terminal hydroxyl groups; the polymer chain segment contains a structural unit C1, a structural unit C2 and a structural unit D; in the polymer, the weight ratio of the dendritic polyester matrix to the structural unit C1 to the structural unit C2 to the structural unit D is 1: (0.5-50): (0.5-100): (0.5-50). The polymer is used as a water-based drilling fluid additive, has excellent shear-improving and tackifying effects under a high-temperature condition, and can resist the temperature of 160 DEG C.

The present invention belongs to the technical field of polyacrylamide preparation, and specifically relates to a method for preparing polyacrylamide for oil displacement. The method for preparing polyacrylamide for oil displacement of the present invention uses acrylamide as the main monomer, N-(1,1-dimethyl-3-oxobutyl) acrylamide, 6-acryloylethylenediamine-β-cyclodextrin and N-dodecyl acrylamide as functional monomers, and adopts a two-polymerization process to prepare polyacrylamide for oil displacement, and in the second polymerization, polymethyl vinyl ether and polyacryloyloxyethyl trimethyl ammonium chloride are creatively added to improve the dispersibility and stability of the system. The polyacrylamide for oil displacement prepared by the preparation method of the present invention has excellent salt resistance and the ability to inhibit hydrolysis, and when used for oil displacement, it also has excellent injection ability, viscosity increase and stability.

The invention discloses an on-line blending-free variable-viscosity high-resistance-reduction retarded acid, and according to an on-line blending-free variable-viscosity high-resistance-reduction retarded acid system provided by the invention, the performance of an acid solution can be changed by changing the dosage of a medicament, and the preparation in advance is not needed. The film coating agent can form an adsorption film on the surface of the rock, and the existence of the adsorption film blocks the contact between H < + > and the rock, so that the acid-rock reaction rate is slowed down. In addition, the retarding agent also has multiple composite retarding performance, the characteristics of foam retarding acid and gelling retarding acid are combined, and the rate of acid-rock reaction is greatly reduced under the double retarding action of tackifying retarding of the multi-effect agent and blocking retarding of the film coating agent. In addition to a good tackifying effect, the tackifying agent also has excellent resistance reducing performance and is multipurpose, and the dosage and types of additives are reduced. Meanwhile, the resistance reduction rate of the system reaches 85% or above and is far better than 70% of that of a traditional system.

The application discloses an integrated composite acid emulsion applied to fracturing fluid and acid liquid and a preparation method thereof, and belongs to the technical field of oil and gas field exploitation. The preparation steps of the emulsion are as follows: S1, organic solvent and composite emulsifier are mixed, stirred, dispersed and uniformly distributed to obtain an oil phase; S2, quaternary ammonium salt unsaturated monomer, sodium benzenesulfonate unsaturated monomer, methacryloyloxyethyl phosphate and a complexing agent are added into water, mixed uniformly and adjusted to have a pH value of 7-9 to obtain an aqueous phase; S3, under the condition of stirring, the aqueous phase is added dropwise into the oil phase to form a water-in-oil emulsion; S4, after nitrogen is passed through the water-in-oil emulsion to remove oxygen, an initiator is added, the temperature is increased to 40-60 DEG C, and stirring reaction is carried out for 4-8 h to obtain the integrated composite acid emulsion. The composite acid emulsion prepared by the inverse emulsion polymerization method has the characteristics of strong thickening, high resistance, high temperature resistance, crosslinking and on-line viscosity change when applied to water and acid liquid, and is an integrated composite acid thickening agent emulsion suitable for fracturing fluid and acid liquid.

The invention discloses a hollow mesoporous silica nanoparticle-based supercritical CO2 thickening agent for a shale gas reservoir and a preparation method thereof, and relates to the technical field of oil-gas field development. The preparation method of the thickening agent comprises the following step: reacting a monomer consisting of fluoroacrylate, styrene and vinyl acetate in a molar ratio of (3-5): (1-2): (1-2) with hollow mesoporous silica nanoparticles with carbon-carbon double bonds, which account for 2-5% of the total mass of the monomer, under the action of an initiator. According to the preparation method, no organic solvent is added in the reaction process, and no harm is caused to the human body; the thickening agent disclosed by the invention is good in CO2 tackifying effect and good in sand-carrying performance, and can effectively improve the fracturing effect.

The present application relates to oil and gas field chemical auxiliary technical field, disclose a kind of high-temperature resistant hyperbranched viscosifying self-generating acid, preparation method and application thereof, the viscosifying self-generating acid of the present application is prepared by iteration reaction with maleic anhydride and polyhydroxy alcohol and / or polyhydroxy alcohol amine as raw material, and the viscosifying self-generating acid obtained by preparation is hyperbranched molecule, and its molecule has hyperbranched structure inside.The hyperbranched viscosifying self-generating acid of the present application is hyperbranched structure, without additional thickening agent when using, itself has thickening function, with excellent viscosifying performance, and preparation process is simple, yield is high and cost is low.And, as acidizing fluid still has good self-generating acid ability under superhigh temperature, especially suitable for acid fracturing reconstruction of superhigh temperature reservoir.

The invention relates to a double-tailed hydrophobic associated polymer oil-displacing agent with a cyclic structure and a preparation method thereof. The oil-displacing agent is formed by copolymerization of four monomers, namely acrylamide, sodium 2-allylmethylamino ethanesulfonate, dihydroxyethyl diallyl ammonium chloride and double-tailed long-chain alkyl methyl (4-vinyl benzyl) ammonium chloride with a hydrophobic monomer with a cyclic structure. The preparation method comprises the following steps: firstly adding distilled water, sequentially adding the rest raw materials such as acrylamide, 2-allylmethylamino sodium ethanesulfonate and dihydroxyethyl diallyl ammonium chloride, supplementing water, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, and reacting at a certain temperature to obtain the quadripolymer. The prepared polymer oil-displacing agent has good water solubility and good temperature resistance and shear resistance, shows good salt resistance in saline water with the mineralization degree larger than or equal to 30000 mg / L, shows a good oil-displacing effect in heterogeneous rock cores, and can improve the crude oil recovery rate by 10% or above.

The application discloses an online mixing-free variable-viscosity high-resistance-slowing acid, and provides an online mixing-free variable-viscosity high-resistance-slowing acid system, wherein the performance of acid liquid can be changed by changing the adding amount of the agent, and the acid liquid does not need to be prepared in advance. The film-forming agent can form an adsorption film on the surface of rock, and the adsorption film blocks the contact between H+ and rock, thereby slowing the acid-rock reaction rate. The application also has multiple composite slow-down performances, and combines the characteristics of foam slow-down acid and gelling slow-down acid. Through the thickening and slowing down of the multiple-effect agent and the blocking and slowing down of the film-forming agent, the acid-rock reaction rate is greatly reduced under the double slow-down effect of the two. In addition to the good thickening effect, the application also has excellent resistance-reducing performance, and one agent is used for multiple purposes to reduce the adding amount and type of the additive. Meanwhile, the resistance-reducing rate of the system reaches more than 85%, which is much higher than the 70% of the traditional system.