42 results about "Methallyl chloride" 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 relates to the technical field of plugging agents, and discloses a viscoelastic polymer type self-assembly plugging agent and a preparation method thereof. The preparation method comprises the following steps: adding acrylamide, butyl acrylate, 2-acrylamide-2-methylpropanesulfonic acid, quaternized cyclodextrin, gamma-glycidyl ether oxypropyl trimethoxy silane modified bentonite, Schiff base styrene, a sodium dodecyl benzene sulfonate emulsifier and octadecyl dimethyl allyl ammonium chloride into a reaction kettle; and adding an azodiisobutyronitrile initiator into the deionized water, uniformly mixing, and reacting for 4-5 hours at 50-65 DEG C to obtain the viscoelastic polymer type self-assembled plugging agent after the reaction is finished. The plugging agent disclosed by the invention has a relatively good plugging effect, and effectively solves the problem that the gel strength is weakened or the gelling is not thorough due to the formation shearing effect in a continuous gel migration process.

The application belongs to the technical field of oil and gas field development, and provides a phase permeability improver, a fracturing fluid system containing the same, and respective preparation methods and applications. The phase permeability improver is obtained by copolymerization and hydrolysis of acrylamide AM, a functional monomer 2-acrylamido-2-methylpropanesulfonic acid AMPS, and cationic hydrophobic monomers A and B; the cationic hydrophobic monomer A is at least one of tetradecyl dimethyl allyl ammonium chloride, hexadecyl dimethyl allyl ammonium chloride, and octadecyl dimethyl allyl ammonium chloride; the cationic hydrophobic monomer B is at least one of methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride, and acryloyloxyethyldimethyl benzyl ammonium chloride; the phase permeability improver and the fracturing fluid system containing the same can significantly reduce the water phase permeability after fracturing operation, while having a smaller influence on the oil phase permeability, and have a significant effect of stabilizing oil and controlling water, and can significantly improve the stable production effect of fracturing operation in a low-permeability oil reservoir.

The invention relates to a film-forming filtrate reducer and a preparation method thereof, workover fluid and a workover method, and relates to the field of workover, the film-forming filtrate reducer comprises an oil phase, an emulsifier, acrylamide, N-vinyl pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride, water and an initiator; the workover fluid comprises water, a tackifier, a plugging agent, an acid-soluble temporary plugging agent, an interface modifier, a corrosion inhibitor, a weighting agent and the film-forming filtrate reducer. According to the film-forming filtrate reducer provided by the invention, specific acrylamide, N-vinyl pyrrolidone, acrylamido-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride are subjected to reverse emulsion polymerization to obtain a polymer, and the polymer is greatly adsorbed on the surface of a filter cake under the action of high temperature and high pressure to form a high-toughness polymeric film; the filter loss is reduced; the temperature resistance of the workover fluid is larger than or equal to 180 DEG C, the pressure-bearing plugging capacity of the workover fluid to a crack core is larger than 10 MPa, and the permeability recovery value is larger than or equal to 92%.

The invention provides a seawater-based polymer coated self-suspending proppant as well as a preparation method and application thereof, and belongs to the technical field of oilfield fracturing exploitation. The proppant is prepared from the following raw materials: a proppant body, a silane coupling agent gamma-methacryloxypropyltrimethoxysilane, acrylamide, a hydrophobic monomer hexadecyl dimethyl allyl ammonium chloride, a twin-tailed betaine monomer, sodium p-styrenesulfonate, an initiator and a solvent. The self-suspending proppant and the nonionic surfactant are compounded for use so as to be applied to the fracturing fluid. On one hand, the polymer on the surface of the proppant has good salt tolerance and is dissolved after meeting seawater, so that the viscosity is increased; and on the other hand, the surfactant and the dissolved polymer coating layer generate a synergistic effect, so that a tackifying effect is achieved. The sand suspending effect is generated as the tackifying effect of normal fracturing fluid, and the seawater low-permeability fracturing requirement is met.

The invention discloses a preparation method and device for improving selectivity of methallyl chloride, the device adopts two sections of reactors, the first section is a main reactor, and a chlorination reaction is mainly carried out in the first section of reactor; chlorine is quantitatively introduced into the second-section reactor so as to consume residual isobutene at the front end. According to the method disclosed by the invention, the chlorination reaction is carried out by utilizing the two-stage reactor, the ratio of isobutene to chlorine is reasonably controlled, and the generation of polychlorinated by-products is inhibited, so that the main product methyl allyl chloride keeps high selectivity, meanwhile, the complete conversion of isobutene is ensured, and the problem of separation of isobutene and hydrogen chloride in tail gas is avoided. According to the process disclosed by the invention, the selectivity of the methallyl chloride reaches 90%, and the economic benefit of the device is obviously improved.

The invention belongs to the technical field of oil-gas field development, and provides a phase permeability improver, a fracturing fluid system containing the phase permeability improver, and preparation methods and applications of the phase permeability improver and the fracturing fluid system. The phase permeability improver is obtained by copolymerization and hydrolysis of acrylamide (AM), a functional monomer 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and cationic hydrophobic monomers A and B, the cationic hydrophobic monomer A is at least one of tetradecyl dimethyl allyl ammonium chloride, hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride; the cationic hydrophobic monomer B is at least one of methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride and acryloyloxyethyl dimethyl benzyl ammonium chloride; the phase permeability improver and the fracturing fluid system containing the phase permeability improver can obviously reduce the water phase permeability after fracturing construction, meanwhile, the influence on the oil phase permeability is small, the oil stabilizing and water controlling effects are obvious, and the low-permeability oil reservoir fracturing construction yield stabilizing effect can be obviously improved.

The invention relates to the technical field of water-absorbent resin, in particular to salt-resistant water-absorbent resin and a preparation method thereof. The preparation method comprises the following steps: weighing acrylic acid, acrylamide, sulfobetaine methacrylate, hexadecyl dimethyl allyl ammonium chloride, sodium alginate, a cross-linking agent, an initiator, an antioxidant, an emulsifier, polyethylene glycol diacrylate and nano montmorillonite; carrying out ultrasonic emulsification on hexadecyl dimethyl allyl ammonium chloride and an emulsifier in ethanol; mixing neutralized acrylic acid, acrylamide and sulphobetaine methacrylate, and introducing nitrogen to remove oxygen; adding sodium alginate for dissolving, and injecting the microemulsion and the organic montmorillonite; adding a cross-linking agent and polyethylene glycol diacrylate, and adding an initiator and an antioxidant; and cross-linking, drying and sieving to obtain a finished product. According to the invention, by reducing the proportion of the ion-sensitive components and forming a salt-resistant interpenetrating network through the organic montmorillonite, the salt resistance of the water-absorbent resin is ensured.

The application provides a carbon nanotube grafted polymer nano plugging agent, a preparation method thereof and a prepared drilling fluid, and the preparation method comprises the following steps: S1, reacting acrylic acid and amino functionalized multi-walled carbon nanotubes in a mass ratio of 1:0.1-0.2 to generate acrylic acid modified carbon nanotubes; and S2, performing a copolymerization reaction on acrylamide, the acrylic acid modified carbon nanotubes and octadecyl dimethyl allyl ammonium chloride in a mass ratio of 25:0.2-0.8:1.2-2.0 to obtain the carbon nanotube grafted polymer nano plugging agent. The carbon nanotube grafted polymer nano plugging agent comprises an amide group, a quaternary ammonium salt structure and an amino group, enhances the micro-nano plugging capacity of the plugging agent, enhances the inhibition capacity of the plugging agent to the hydration expansion and dispersion of formation mud shale, and has good temperature resistance, salt resistance and dispersion stability.

The invention relates to the technical field of polyacrylamide preparation, in particular to a preparation method of a temperature response type polyacrylamide water-in-water emulsion. The preparation method comprises the following steps: S1, mixing ammonium sulfate and a dispersion stabilizer, adding deionized water, and stirring to obtain a solution A; s2, mixing acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, N-vinyl pyrrolidone, octadecyl dimethyl allyl ammonium chloride and a modifier, and then adding water for dissolving, so as to obtain a solution B; and S3, mixing the solution A and the solution B, adjusting the pH value to 6.5-7.5, adding an initiator, and reacting to obtain the temperature-responsive polyacrylamide water-in-water emulsion. The invention provides a preparation method of a temperature response type polyacrylamide water-in-water emulsion, and aims to solve the problems of injection difficulty and insufficient high temperature resistance caused by poor solubility, poor rheological property and high injection viscosity of traditional PAM in related technologies.

The application discloses a kind of tetrapolymer type acidizing retarder and its preparation method and application, it is related to oil and gas exploitation technical field.The retarder is polymerized by acrylamide, sulfonate monomer, allyl polyoxyethylene ether and octadecyl dimethyl allyl ammonium chloride four monomers, other quaternary ammonium salt monomers except octadecyl dimethyl allyl ammonium chloride are not included in the system.By excluding the second quaternary ammonium salt monomer, electrostatic crosslinking caused by polyvalent cation center is cut off, and the viscosity of acid system is reduced to below 4 mPa·s.At the same time, the single quaternary ammonium salt structure unit produces adsorption isolation effect at rock interface, so that the retardation rate under the condition of 110 DEG C is maintained above 82%.The retarder provided by the application has low viscosity, high temperature resistance and salt resistance, and is suitable for high temperature deep well acidizing and fracturing operation.

The application relates to a film-forming fluid loss additive, a preparation method thereof, a workover fluid and a workover method, and relates to the workover field. The film-forming fluid loss additive comprises an oil phase, an emulsifier, acrylamide, N-vinyl pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride, water and an initiator. The workover fluid comprises water, a viscosity increasing agent, a plugging agent, an acid-soluble temporary plugging agent, an interface modifier, an anti-corrosion agent, a weighting agent and the aforementioned film-forming fluid loss additive. The film-forming fluid loss additive is provided, a polymer obtained through reverse emulsion polymerization of specific acrylamide, N-vinyl pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride is massively adsorbed on the surface of a filter cake under the action of high temperature and high pressure to form a high-molecular polymer film with high toughness, and the reduction of the fluid loss is realized. The temperature resistance of the workover fluid is greater than or equal to 180 DEG C, the pressure plugging capacity of the workover fluid to a fractured core is greater than 10 MPa, and the permeability recovery value of the workover fluid is greater than or equal to 92%.

The invention discloses an emulsion stock solution, acidic slickwater and a corresponding preparation method and application, and the preparation method of the emulsion stock solution comprises the following steps: carrying out polymerization reaction on an aqueous solution and an oil solution under the action of an initiator to obtain the emulsion stock solution; wherein the aqueous solution comprises an anionic monomer, a cationic monomer, a nonionic monomer and water; the oil solution comprises an emulsifier, a co-emulsifier and oil; the anionic monomer is one or more of 2-acrylamido-2-methylpropanesulfonic acid, alkali metal salt of allyl sulfonic acid and alkali metal salt of maleic acid; the cationic monomer is one or more of octadecyl dimethyl allyl ammonium chloride, dimethyl diallyl ammonium chloride and epoxy propyl ethyoxyl trimethyl ammonium chloride; the nonionic monomer is one or more of hydroxymethyl acrylamide, hydroxymethyl methacrylate and dimethylaminoethyl methacrylate. The acidic slick water prepared by the invention can be quickly dissolved and adhered, can be continuously prepared, and can be used for dissolving carbonate rocks.

The invention relates to the technical field of preparation of 2-methylallyl magnesium chloride, in particular to a preparation method of 2-methylallyl magnesium chloride, which comprises the following steps: pretreatment and initial feeding, reaction initiation, continuous reaction and heat preservation, end point judgment and product transfer. Magnesium is activated through a zinc stearate ethanol solution, zinc stearate can form an ultra-thin selective adsorption layer on the surface of magnesium particles, the layer cannot completely isolate the reaction, the reaction rate can be regulated and controlled, the risks of bumping and material flushing caused by too violent local reaction are avoided, and meanwhile, the service life of magnesium particles is prolonged. Ethanol is used as a solvent to assist zinc stearate to be uniformly attached to the surface of magnesium, and the dispersity of magnesium particles can be improved when the ethanol is subsequently mixed with tetrahydrofuran; tert-butyl p-hydroxyanisole is added into 2-methylallyl chloride to serve as a stabilizer, free radicals possibly generated in a reaction system can be captured, and side reactions such as polymerization and oxidation of 2-methylallyl chloride are inhibited.

The invention belongs to the technical field of synthesis of organic compounds, and relates to a synthesis method of drometrisiloxane, which comprises the following steps: carrying out Williamson etherification reaction on an ultraviolet light absorber UV-P and methyl allyl chloride to obtain an intermediate I; carrying out Claisen rearrangement reaction on the intermediate I to obtain an intermediate II; and carrying out hydrosilylation reaction on the intermediate II and heptamethyltrisiloxane to obtain dromethicone, the Williamson etherification reaction comprises the following steps: dissolving an ultraviolet light absorber UV-P in an alcohol ether solvent, and reacting with methyl allyl chloride under the condition of an acid-binding agent. According to the synthesis method of the drometrisiloxane, the etherification reaction is efficient, simple and convenient, the hydrosilylation reaction catalyst is high in efficiency, the solvent system is green and economical, the overall process is high in yield and purity, and the product quality is excellent.

The invention belongs to the technical field of synthesis of epoxy compounds, and discloses a preparation method of (methyl) epichlorohydrin. The preparation method comprises the following steps: (1) after tungstic acid reacts with hydrogen peroxide A, adding phosphoric acid for continuous reaction to prepare peroxyphosphotungstic acid; and (2) mixing the peroxy phosphotungstic acid prepared in the step (1) with allyl chloride or methyl allyl chloride dissolved with quaternary ammonium salt and a pH regulator, and adding hydrogen peroxide B for reaction to prepare epoxy chloropropane or methyl epoxy chloropropane. By adopting the preparation method provided by the invention to prepare the (methyl) epichlorohydrin, the procedures of liquid separation, drying and the like in the catalyst preparation process are omitted, the process steps are few, and hydrogen peroxide and a large amount of solvent can be saved while the process is simplified; and the prepared catalyst is high in selectivity, good in reuse effect and convenient to recycle and reuse.

The invention relates to a solid-liquid mixed electrolyte based on bifunctional quaternary ammonium salt modification and a preparation method of the solid-liquid mixed electrolyte, and belongs to the technical field of lithium ion batteries. Wherein the bifunctional quaternary ammonium salt monomer is hexadecyl dimethyl allyl ammonium chloride. According to the structure, stable embedding of quaternary ammonium cations in a polymer main chain is realized, the dissociation capacity of lithium salt and the transference number of lithium ions are remarkably improved, and meanwhile, anion migration and interface side reaction are inhibited. The electrolyte has excellent rate capability and cycling stability, and is suitable for a high-voltage lithium ion battery system.

The invention discloses a preparation method of methylallyl alcohol, which comprises the following steps: adding tricarboxylate into a reaction kettle, adding water for dissolving, heating and refluxing; dropwise adding methyl allyl chloride, and controlling the reaction temperature; cooling and filtering to obtain tricarboxylate solid and filtrate for later use; adding the tricarboxylate solid into a sodium hydroxide aqueous solution for reflux hydrolysis, cooling and layering to obtain methylallyl alcohol and tricarboxylate, and after separation, combining the tricarboxylate with the filtrate for recycling. The polycarboxylate obtained after esterification of the ternary carboxylate has small solubility in a solution, and an esterification product is a precipitate and can be naturally separated out; the esterification reaction can be carried out even under the condition of no catalyst, and the reaction is simple and rapid; then, the polybasic carboxylic ester can be separated through simple filtration, so that the emulsification phenomenon of the carboxylic ester in a water layer is overcome; and hydrolyzing the polybasic carboxylic ester to obtain corresponding alcohol and tricarboxylate, rectifying the alcohol to obtain the product methylallyl alcohol, and recycling the tricarboxylate.

The invention discloses an oil-based drilling fluid flocculant and a preparation method thereof. The flocculant comprises the following steps: step 1: adding divinylbenzene and hexadecyldimethylallyl ammonium chloride to an octadecyl acrylate solution and fully mixing; step 2: adding an initiator, condensing and refluxing under a protective atmosphere, and stirring for reaction; after the reaction is completed, filtering and drying to obtain the flocculant; the molar ratio of the octadecyl acrylate, divinylbenzene and hexadecyldimethylallyl ammonium chloride is 15-60:5-20:5-20; the quaternary ammonium group in the flocculant obtained by the invention has strong adsorption capacity and can adsorb cuttings dispersed in the oil-based drilling fluid, while providing conditions for the flocculant to selectively flocculate; the main chain atoms of the flocculant are soluble in oil and have good dispersibility, so that the flocculant has a good flocculation effect in the drilling fluid.

The invention relates to a synthesis method of 2-methylallyl chloride, which comprises the following steps: by taking isobutylene chloride as a raw material, carrying out transposition rearrangement of free radical chlorine under the condition of ultraviolet irradiation to obtain the 2-methylallyl chloride. The method has the advantages that the process is simple, the conversion yield is high, the byproduct isobutenyl chloride in the process of preparing 2-methylallyl chloride through isobutene chlorination can be turned into wealth, and the additional value of the byproduct is improved.

The present application relates to the technical field of oilfield treatment agent, and is an oilfield sewage treatment oil removal agent and a preparation method thereof.The former is obtained by the following method: 1-ethyl-4-vinylbenzene, methacrylate, long-chain alkyl dimethyl allyl ammonium chloride, urea, anhydrous ethanol and water are stirred and uniformly mixed to obtain a mixed solution, and then acrylamide and a catalyst are added to the mixed solution to react and obtain the oil removal agent.The raw materials are easy to obtain, and the process is simple.The oil removal agent obtained by the preparation method has strong oil removal capacity, high oil removal rate, and is suitable for oil-water separation of oilfield sewage.The oil removal agent is effective in a wide pH range, does not contain metal ions, avoids secondary pollution, and also has the functions of demulsification, sterilization, flocculation and slow release.

The present application discloses a tertiary oil recovery method and its oil-displacing agent using a composite oil-displacing agent, belonging to the field of tertiary oil recovery technology. The composite oil-displacing agent includes the following percentages of components: 0.5-1.5% of a tetrapolymer, 0.1-0.3% of a heavy oil penetrant, 0.3-1% of a surfactant, and the remainder of water; the surfactant includes a lipopeptide biosurfactant and sodium fatty alcohol polyoxyethylene ether carboxylate; the tetrapolymer is obtained by copolymerization of acrylamide, acryloylmorpholine, 2-acrylamide-2-methylpropanesulfonic acid, and hexadecyldimethylallyl ammonium chloride; the heavy oil penetrant is octadecyl methacrylate or octadecyl acrylate. By compounding a specific tetrapolymer, a surfactant, and a heavy oil penetrant in a specific ratio, a composite oil-displacing agent is obtained, which can improve oil displacement efficiency, and the oil-displacing agent has the effects of salt and high temperature resistance, and can meet the requirements of efficient viscosity increase under high temperature and high mineralization conditions.

The present invention provides a seawater-based polymer-coated self-suspending proppant and its preparation method and application, which belong to the technical field of oilfield fracturing and exploitation. The proppant of the present invention is prepared from the following raw materials: proppant, silane coupling agent γ-methacryloyloxypropyltrimethoxysilane, acrylamide, hydrophobic monomer hexadecyldimethylallyl ammonium chloride, twin-tailed betaine monomer, sodium styrene sulfonate, initiator, and solvent. The self-suspending proppant of the present invention and non-ionic surfactant are compounded and used in fracturing fluid. On the one hand, the polymer on the surface of the proppant of the present invention has good salt resistance and dissolves after encountering seawater, thereby increasing its viscosity; on the other hand, the surfactant and the dissolved polymer coating produce a synergistic effect to achieve a viscosity-increasing effect. The same sand suspension effect as the viscosity-increasing effect of normal fracturing fluid is produced to meet the requirements of low-permeability seawater fracturing.

The invention discloses an picloram triethanolamine salt water agent auxiliary agent and a preparation method thereof. The auxiliary agent is prepared from the following components in percentage by weight: 20-45% of dihydrogenated tallow dimethyl ammonium chloride, 10-20% of triethanolamine, 10-20% of sodium chloride, 5-10% of sodium chloride, 5-10% of sodium chloride and the balance of water. 15 to 30% of hydrogenated tallow amine acetate; 10 to 20% of hexadecyl dimethyl allyl ammonium chloride; 1-2% of dioctyl sodium sulfosuccinate; and the balance water. The picloram triethanolamine ammonium salt aqueous solution processed by the method is not easy to solidify at low temperature, has the characteristics of high efficiency, high environmental and biological safety, good preparation stability and the like, is particularly suitable for northern use, and has a good application prospect.

The invention discloses a tertiary oil recovery method using a composite oil-displacing agent and the oil-displacing agent thereof, and belongs to the technical field of tertiary oil recovery. The composite oil displacement agent is prepared from the following components in percentage: 0.5 to 1.5 percent of quadripolymer, 0.1 to 0.3 percent of thickened oil penetrating agent, 0.3 to 1 percent of surfactant and the balance of water, the surface active agent comprises a lipopeptide biological surface active agent and sodium fatty alcohol-polyoxyethylene ether carboxylate; the quadripolymer is obtained by carrying out copolymerization on acrylamide, acryloyl morpholine, 2-acrylamide-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride; and the thick oil penetrating agent is octadecyl methacrylate or octadecyl acrylate. According to the present invention, the specific quadripolymer, the surfactant and the thick oil penetrating agent are compounded according to the specific ratio to obtain the composite oil displacement agent, such that the oil displacement efficiency can be improved, and the oil displacement agent has effects of salt resistance and high temperature resistance, and can meet the efficient tackifying requirement under the high temperature and high salinity condition.

The present invention belongs to the technical field of gas well water control agents and preparation methods thereof, and specifically relates to a preparation method and improver of a phase permeability improver for gas well water control, and its application, aiming to solve the problems of salt resistance and poor selectivity of phase permeability change in existing phase permeability improvers. The preparation method of the improver comprises the following steps: step one: adding itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, hexadecyldimethylallyl ammonium chloride, and diallyldimethylammonium chloride to a reaction vessel, dissolving the above five monomers in water, drying and grinding to obtain a phase permeability improver main agent; step two: dissolving the phase permeability improver main agent in water to prepare a main agent solution with a concentration of 0.2-0.5%; step three: adding a metal cross-linking agent to the main agent solution, and obtaining a phase permeability improver gel after the reaction. The improver has strong salt resistance, expands in contact with water, reduces permeability, and has little change in contact with gas permeability, meeting the needs of water-containing gas stratum water control fracturing construction.

This invention provides a thickener for fracturing, its preparation method, and its application. The preparation method includes: reacting monomers in an aqueous environment using an azo initiator and a redox initiator; the resulting product is then granulated, hydrolyzed, dried, and powdered to obtain the thickener for fracturing; wherein, based on the total monomer mass of 100%, the monomers include 64.5%-70.5% hydrophilic monomers, 5.5%-7% cationic monomers, 18%-24.5% anionic monomers, and 4.5%-7.0% composite supramolecular interaction monomers; the hydrophilic monomer is acrylamide; the cationic monomer is dimethyl diallyl ammonium chloride and / or acryloyloxyethyltrimethylammonium chloride; the anionic monomer is sodium acrylate; the composite supramolecular interaction monomers include a mixture of hexadecyl dimethyl allyl ammonium chloride, octadecyl dimethyl allyl ammonium chloride, and silane monomers in a mass ratio of 4.1-4.5:1:0.3-0.7.

The invention relates to the technical field of exploitation auxiliary materials for carbonate reservoir oil and gas wells, and particularly discloses a carbonate reservoir acidification diverting agent, a preparation method of the diverting agent and acidification acid liquor. The acidification diverting agent is obtained by free radical polymerization reaction of a monomer a, a monomer b and a monomer c; wherein the monomer a is acrylamide, the monomer b is 1-vinyl-3-propyl imidazole sulfonate, and the monomer c is octadecyl dimethyl allyl ammonium chloride; the molar ratio of the monomer a to the monomer b to the monomer c is (73-83): (85-91): (2-4). The acid liquor has the beneficial effects that the acid liquor still keeps the structural stability at high temperature, and keeps certain viscosity; secondary damage to the stratum is avoided; the structure can be subjected to gel breaking and viscosity reduction in the stratum, and flowback is facilitated.

The application discloses a self-degradation temporary plugging agent and a preparation method and application thereof. The raw materials of the self-degradation temporary plugging agent are composed of the following components in parts by weight and the total mass is 100 parts: 19.4-20 parts of hydrophilic polymer monomer, 10.5-1 parts of modified nano-particle NP-1, 0.1-0.5 parts of hydrophobic monomer, 0.12-0.2 parts of crosslinking agent, 0.8-1 parts of initiator, and the balance of water; the hydrophilic polymer monomer is acrylamide and / or acrylic acid; the hydrophobic monomer is selected from one or more of cetyl dimethyl allyl ammonium chloride, dimethyl diallyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride; the crosslinking agent is polyethylene glycol diacrylate; and the modified nano-particle NP-1 is nano-SiO2 which is hydrophobically modified by a silane coupling agent. The temporary plugging agent has a certain plugging strength under high pressure difference conditions and can be self-degraded into a low-viscosity solution in a wide temperature range (40-120 DEG C).

The invention provides a carbon nanotube grafted polymer nano plugging agent, a preparation method thereof and a prepared drilling fluid, the preparation method comprises the following steps: S1, acrylic acid and amino-functionalized multi-walled carbon nanotubes in a mass ratio of 1: (0.1-0.2) are subjected to a reaction to generate acrylic acid modified carbon nanotubes; s2, acrylamide, the acrylic acid modified carbon nanotubes and octadecyl dimethyl allyl ammonium chloride are subjected to a copolymerization reaction according to the mass ratio of 25: (0.2-0.8): (1.2-2.0), and the carbon nanotube grafted polymer nano blocking agent is obtained. The carbon nanotube grafted polymer nano plugging agent comprises an amide group, a quaternary ammonium salt structure and an amino group, the micro-nano plugging capability of the plugging agent is enhanced, the inhibition capability on hydration expansion and dispersion of stratum shale is enhanced, and the plugging agent has good temperature resistance, salt resistance and dispersion stability.