7447results about "Drilling composition" patented technology

The invention relates to the technical field of oil exploitation, and discloses a compound containing an amide group as well as a preparation method and application thereof. The compound containing the amide group has a structure as shown in a formula (1). The polymer obtained by polymerizing the compound can improve the water-drive recovery efficiency of conventional oil reservoirs and common heavy oil reservoirs. # imgabs0 #

The invention relates to the field of preparation of novel compounds, and discloses a glycoside group-containing compound as well as a preparation method and application thereof. The glycoside group-containing compound has a structure as shown in a formula (1). The polymer obtained by polymerizing the compound can improve the water-drive recovery efficiency of conventional oil reservoirs and common heavy oil reservoirs. # imgabs0 #

The invention relates to the field of oil exploitation, and discloses a polymer with a heavy oil cold recovery function as well as a preparation method and application thereof. After the polymer disclosed by the invention enters a stratum, hydrophobic groups on a polymer chain can be adsorbed on an oil-water interface, the aggregation state of micelles is destroyed, the size of the micelles is greatly reduced, and released energy can provide energy required by emulsification. And meanwhile, after the amphiphilic groups are adsorbed to an oil-water interface, the tension of the oil-water interface is reduced, a low-surface-tension oil phase is automatically diffused to a high-surface-tension water phase, and spontaneous permeation emulsification viscosity reduction of the thick oil is realized without external force or under the low-power condition by virtue of the Malangori effect.

The invention relates to a preparation method and application of a composite leakage-proof agent while drilling, and belongs to the technical field of petroleum drilling engineering. The composite leakage-proof agent while drilling is prepared from the following components in percentage by mass: 20-45% of nano composite particles, 15-35% of a multi-stage fiber reinforced network material, 10-20% of an intelligent response blocking agent, 5-10% of a high-temperature-resistant additive, 1-5% of a dispersing agent and the balance of deionized water, wherein the sum of the contents of all the components is 100%. According to the composite leak-proof agent while drilling provided by the invention, the temperature-sensitive resin with a core-shell structure is introduced, so that a three-dimensional synergistic mechanism of nano-composite particle filling-multistage fiber network bridging-intelligent response curing is realized, and efficient and environment-friendly plugging of an ultrahigh-temperature and high-pressure stratum is realized. The success rate of one-time plugging is increased from 45% to 92%, the average operation time is shortened by 60%, and an efficient solution is provided for deep and ultra-deep drilling.

The invention provides a high-temperature-resistant and high-salt-resistant nano imbibition agent as well as a preparation method and application thereof. The high-temperature-resistant and high-salt-resistant nano imbibition agent is prepared from amination modified mesoporous silica nanoparticles, nano cellulose, rhamnolipid, an anionic surfactant, citrate modified sodium zirconium phosphate, polyethylene glycol-b-polycaprolactone and a sulfydryl-carboxyl imidazoline derivative, therefore, the composite carrier formed by the aminated mesoporous silica nanoparticles and the nanocellulose has high mechanical strength and uniform dispersity, the oil-water interfacial tension is reduced through the synergistic effect of the rhamnolipid and the anionic surfactant, and the crude oil stripping efficiency is remarkably improved; the citrate modified sodium zirconium phosphate enables the salt resistance of the system to be greatly improved, and in a high-temperature and high-salt oil reservoir environment, the nano imbibition agent can remarkably improve the crude oil recovery rate and reduce the injection pressure and dosage; meanwhile, good adsorption resistance is achieved, and reservoir blockage is prevented; in addition, low-toxicity corrosion inhibition components protect equipment, and the service life of an oil well is prolonged.

The invention relates to the technical field of fracturing fluids, and discloses a preparation method of a temperature-resistant and salt-resistant fracturing fluid, which comprises the following steps: carrying out polymerization reaction on acrylamide, acrylic acid and an acrylamide sulfonic acid monomer to obtain a polymer thickening agent, and compounding the polymer thickening agent with a cross-linking agent, a clay stabilizer and the like to obtain the temperature-resistant and salt-resistant fracturing fluid. The polymer thickening agent contains long-chain alkyl, a physical cross-linked spatial network structure can be formed through a hydrophobic association effect, the hydrodynamic volume is increased, a good tackifying effect is achieved, and after high-speed shearing, the long-chain alkyl can be cross-linked again to form a spatial network structure, so that a solution still keeps very high apparent viscosity, and the viscosity of the solution is improved. Good anti-shearing performance is realized. The acrylamide sulfonic acid monomer contains a sulfonate group and is used as a temperature-resistant and salt-resistant monomer, so that the polymer thickening agent has good temperature resistance and salt resistance, and the fracturing fluid still keeps relatively high apparent viscosity after being subjected to high-temperature heat treatment and in formation water with high salinity.

The invention discloses a self-crosslinking temperature-resistant salt-resistant emulsion type fracturing fluid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The raw materials adopted by the invention comprise 30 to 50 parts of an oily solvent, 15 to 25 parts of deionized water, 10 to 20 parts of acrylamide, 5 to 10 parts of acrylic acid, 2 to 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.05 to 0.2 part of a crosslinking monomer, 0.5 to 1 part of a quaternary ammonium salt type hydrophobic association monomer, 4 to 8 parts of an emulsifier and 1 to 2 parts of a phase inversion agent. The self-crosslinking emulsion is formed through water phase-oil phase mixing, high-speed emulsification, low-temperature initiation polymerization and phase inversion treatment. Based on physical-chemical double-crosslinking temperature control cooperation, a salt-resistant-hydrophobic double-shielding mechanism and an integrated design without an exogenous crosslinking agent, the contradiction between the temperature-resistant and salt-resistant performance of a traditional thickening agent and the process complexity is broken through, and a technical support is provided for efficient development of high-temperature and high-salt oil and gas reservoirs.

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention discloses a nano blocking agent for drilling fluid and a preparation method thereof, and belongs to the technical field of blocking agents, the nano blocking agent for drilling fluid is prepared by reaction of a core layer blocking agent and a shell layer blocking agent, the core layer blocking agent is prepared by reacting nano silicon dioxide, gamma-methacryloxypropyltrimethoxysilane and a first part of vinylphosphonic acid, and has secondary blocking capability; and the shell blocking agent is prepared by reacting a second part of vinyl phosphonic acid, styrene and 2-dodecene-1-yl succinic anhydride, and has the characteristic of flexibility. The nano plugging agent has rigid supporting and flexible deformation capabilities, and the high-temperature stability and compressive strength of a plugging layer are remarkably improved. The chemical binding force of the plugging agent and the rock is enhanced; the hydrolysable methoxyl reserved in the core layer provides a secondary plugging function, and the plugging validity period is prolonged. The invention relates to a preparation method of a nano blocking agent for drilling fluid, which is used for preparing the nano blocking agent for drilling fluid.

The invention discloses an inorganic two-component grouting material for a mine and a preparation method and application thereof, and belongs to the technical field of inorganic grouting materials. The weight ratio of the component A to the component B is (0.3-1.2): 1, and the component A comprises superfine Portland cement, silicon powder, an expanding agent, a water reducing agent, a retarder, lithium carbonate, cellulose ether, a defoaming agent and latex powder; the component B comprises sulphoaluminate cement, slag, an expanding agent, a water reducing agent, lithium carbonate, cellulose ether, a defoaming agent, latex powder and a retarder; the weight ratio of the slag to the sulphoaluminate cement is (3.5-5.6): 1, and the weight ratio of the superfine Portland cement to the sulphoaluminate cement is (2.5-4): 1. The inorganic double-component grouting material for the mine can be rapidly solidified and has the functions of water plugging and reinforcement.

The invention relates to the field of oil well opening and killing fluid production, in particular to a solid-free well killing fluid for shale oil reservoir and a preparation method of the solid-free well killing fluid. The solid-free well killing fluid for the shale oil reservoir comprises the following raw materials in parts by mass: 50-70 parts of water, 10-30 parts of a density regulator, 3-6 parts of a copolymer tackifier, 1-3 parts of a dispersant, 3-7 parts of a filtrate reducer and 2-4 parts of a corrosion inhibitor. The copolymer tackifier is obtained by initiating copolymerization by taking acrylamide, a quaternary ammonium salt-containing monomer, an unsaturated silane coupling agent and polyethylene glycol diacrylamide as monomer free radicals, and the dispersing agent comprises gas-phase nano silicon dioxide and a fluorine-containing surfactant. Through reasonable compatibility of all the components in the formula, especially the copolymer tackifier, the effect that one agent has multiple functions is achieved, and meanwhile the high temperature resistance, the corrosion inhibition performance and the clay stability of the well killing fluid are improved.

The present invention relates to the technical field of sand consolidation in oil / gas wells, and in particular to a modified nano-particle and a preparation method therefor, a sand consolidation material and a use thereof, and a sand consolidation method for an oil / gas well. The modified nanoparticle comprises an inorganic nanoparticle, coupling groups grafted on the surface of the inorganic nanoparticle, and crosslinking reactive groups and hydrophilic groups grafted on the coupling groups. The use of the modified nanoparticle in the present invention to prepare a sand consolidation material can significantly improve the sand consolidation effect of the sand consolidation material.

The invention discloses an organic plugging agent, a preparation method thereof and application of the organic plugging agent to inhibition of SAGD steam cavity edge water invasion. The organic plugging agent is prepared from the following raw materials: epoxy resin, a curing agent, nano aerogel, mineral fibers, plant fibers, a reactive diluent, a heat stabilizer and water, the epoxy resin is at least one of glycidyl amine epoxy resin and alicyclic epoxy resin; the curing agent is at least one of amino resin, dicyandiamide and hydrazide; the heat stabilizer is at least one of thiourea, sodium thiosulfate and cobalt chloride. The organic plugging agent is excellent in high temperature resistance, mineralization resistance and plugging performance, the organic plugging agent, nitrogen and an inorganic plugging agent are injected into a water plugging system of an SAGD steam cavity edge well in a slug mode, the organic plugging agent is applied to SAGD high-temperature and high-leakage well conditions, and the SAGD production effect can be effectively improved.

The invention provides a cement paste system with high strength, elasticity and toughness and application of the cement paste system in deep coal bed gas horizontal well cementation, and the cement paste system is prepared from the following raw materials in parts by mass: 40-70 parts of oil well cement, 13-40 parts of fly ash, 15-45 parts of slag, 5.0-20.0 parts of water-based organic silicon resin, 0.1-0.5 part of ultra-high performance polyethylene fiber, 3.0-8.0 parts of calcium oxide and 2.0-5.0 parts of calcium sulfate whisker. 1.0-8.0 parts of nano silicon dioxide, 1.0-6.0 parts of a fluid loss agent, 0.5-2.0 parts of a drag reducer, 0.2-1 part of a defoaming agent and 50-80 parts of water. The cement paste system disclosed by the invention has the characteristics of remarkable low-temperature quick setting and high early strength, also has the advantages of low water loss, controllable thickening, simple preparation operation and the like, and set cement is high in compressive strength, high in breaking strength and very excellent in elastic and tough mechanical properties.

The invention provides a salt-responsive temperature-resistant salt-resistant water-based drilling fluid tackifying filtrate reducer as well as a preparation method and application thereof, and belongs to the technical field of drilling. The tackifying filtrate reducer is prepared from the following raw materials in parts by mass: 30 to 50 parts of 1-(2-carboxyethyl)-2-vinylpyridine, 20 to 40 parts of (3-(methacrylamido) propyl) dimethyl (3-thiopropyl) ammonium hydroxide inner salt, 35 to 55 parts of N, N-dimethylacrylamide, 10 to 25 parts of 4-vinylpyridine, 300 to 500 parts of water and 1 to 5 parts of an initiator. According to the filtrate reducer, cations and anions are concentrated on one monomer molecule, so that the synthesized product contains the cations and the anions with the same charge number, has good adsorption capacity and salt response characteristics, is compatible with salt essentially, can effectively resist high temperature and high salt, and can be recycled. And the viscosity-increasing and filtrate-reducing agent has good viscosity-increasing and filtrate-reducing effects on the drilling fluid.

A method for performing a refracturing operation using coke proppant particles comprises refracturing a subterranean formation that has been previously hydraulically fractured with respect to a hydrocarbon well by injecting a fracturing fluid comprising a carrier fluid and coke proppant particles into the subterranean formation via a wellbore of the hydrocarbon well.

The invention discloses a synthesis method of amphiphilic quantum dots and application of the amphiphilic quantum dots in nano oil displacement, and belongs to the field of nano oil displacement. The synthesis method comprises the following steps: heating a mixture containing a carbon source and a nitrogen source in an air atmosphere for reaction, and centrifuging, filtering and drying a reaction product to obtain the amphiphilic quantum dots, the carbon source is selected from at least one of glucose, mannose, citric acid, lignin, chitosan and starch; the nitrogen source is selected from at least one of alkylamine, and the carbon chain length of the alkylamine is C6 to C12. The synthesis method is simple, heating of a high-pressure reaction kettle is not needed, the technological process is simple, and the method is suitable for large-scale industrial production; the series of amphiphilic carbon quantum dots show better solubility and higher absolute fluorescence quantum yield in water and various organic solvents.

The invention discloses a shale oil exploitation method based on cooperation of multistage pulse gas fracturing and nano-catalysis, and belongs to the technical field of oilfield development, and the shale oil exploitation method comprises the following steps: S1, determining an optimal drilling position of a target shale layer, and carrying out drilling operation; s2, 0.1-10 Hz adjustable pulse pressure waves are formed through control of a high-frequency electromagnetic valve, a fracturing medium mixed with the functionalized nanoparticles is injected into the stratum through a fracturing pump, the pulse frequency of the high-frequency electromagnetic valve is adjusted, staged pulse fracturing operation is conducted, and a fracture network is formed; s3, after fracturing of each stage is completed, mixed fluid of a propping agent and fracturing fluid is injected into stratum fractures; and S4, after fracturing operation is completed, a microwave field is applied to the stratum, and the stratum temperature is kept within a set range. According to the method, the gas fracturing medium and the functionalized nanoparticles are mixed and then fractured, so that the influence on the environment is remarkably reduced, and the recovery ratio of shale oil is greatly increased under the combined action of multi-stage pulse fracturing, the composite proppant and the microwave field.

A method for producing hydrocarbon fluids via a hydrocarbon well comprises providing petroleum coke proppant particles having an Amott index for oil of at least 0.02, an Amott index for water of at most 0.1, and a pseudo Amott index of at most 0.35. The method also comprises, for each of a number of stages of the hydrocarbon well, introducing a fracturing fluid comprising a carrier fluid and the petroleum coke proppant particles into a subterranean formation via a wellbore of the hydrocarbon well and then producing hydrocarbon fluids from the subterranean formation via the wellbore of the hydrocarbon well.

The invention relates to the technical field of preparation of surfactants, in particular to a PPO / PEO block Gemini ductile surfactant suitable for high-temperature and high-salt oil reservoirs and a preparation method of the PPO / PEO block Gemini ductile surfactant. The preparation method comprises the following steps: by taking fatty alcohol as an initial raw material, carrying out gradual addition on the fatty alcohol, propylene oxide (PO) and ethylene oxide (EO) through a potassium hydroxide / 18-crown ether-6 catalytic system to prepare an APOnEOm intermediate; the preparation method comprises the following steps: carrying out esterification with a polyethylene glycol bismaleate connecting group, and finally sulfonating with sodium hydrogen sulfite to obtain polyethylene glycol bismaleate diester sodium sulfonate (T-APOnEOm-S). By regulating and controlling the PPO / PEO block ratio, the product has excellent temperature resistance and salt resistance, is suitable for high-temperature and high-salt oil reservoirs, has strong emulsifying capacity, can reduce the oil-water interfacial tension to 10 <-3 > mN / m level, and remarkably improves the oil recovery rate. The preparation process is mild in condition and adjustable in product performance, and has important application value in the field of tertiary oil recovery.

The invention relates to the technical field of oil-displacing agents, and particularly discloses a targeted nano oil-displacing agent and a preparation method thereof. A preparation method of a targeted nano oil displacement agent comprises the following steps: S1, dispersing 10-30 parts by mass of silanized inorganic nanoparticles in an alcoholic solution, adding 5-12 parts by mass of a functional monomer, 8-20 parts by mass of a hydrophilic monomer and 5-15 parts by mass of a hydrophobic monomer in an inert atmosphere, uniformly mixing, heating to 75-85 DEG C, adding an initiator, carrying out a constant temperature reaction for 4-6 h, and cooling to obtain a pre-grafted nanoparticle dispersion liquid; s2, mixing the pre-grafted nanoparticle dispersion liquid with a composite surfactant, adjusting the pH value to 6.5-7.5, and mixing at 30-40 DEG C for 22-26 hours to obtain the targeted nano oil displacement agent, the targeting type nano oil displacement agent prepared by the invention can still keep excellent dispersion stability and ultralow interfacial tension under the condition of a high-salt oil reservoir, so that the oil displacement efficiency is remarkably improved.

The invention provides a modified coal gangue-based large-flow-state grouting and water plugging material and a preparation method thereof. Comprising 80-90 parts of a coal gangue sample, 1-5 parts of Portland cement, 1-5 parts of sulphoaluminate cement, 0.51-3 parts of a polycarboxylic acid water reducing agent, 1-4 parts of cellulose ether with the viscosity of 200w, 0.1-5 parts of a calcium oxide expanding agent, 0.5-5 parts of a plastic expanding agent, 0.5-1 part of redispersible latex powder, 0.5-5 parts of polyacrylamide with the molecular weight of 1000 and water, and the water-material ratio is 0.4. According to the modified coal gangue-based large-flow-state grouting and water plugging material and the preparation method thereof, the cement consumption can be remarkably reduced, the cost is reduced, the utilization rate of solid wastes (such as coal gangue) is increased, and the material has good flow-state performance and adjustable setting time; the method is suitable for deep and large shaft surrounding rock water seepage treatment in coal mining and other mine engineering.

The invention discloses a high-performance guanidine gum fracturing fluid system for deep coal rock gas backlog fracturing and application, and relates to the technical field of oil and gas reservoir chemistry, the high-performance guanidine gum fracturing fluid system for deep coal rock gas backlog fracturing comprises the following components: 0.05-0.35% of graft modified guanidine gum, 0-0.3% of multiple cross-linking agent, 0-0.2% of conditioning agent, 0.1-0.3% of functional additive, 0-0.1% of gel breaker, and the balance of water, the grafting modified guanidine gum is prepared by performing functional group modification and side chain grafting polymerization on guanidine gum raw powder, the number of chemical crosslinking groups and branched chains is remarkably increased, after the grafting modified guanidine gum is compounded with a matched multiple crosslinking agent, the chemical and physical synergistic crosslinking effect is remarkably enhanced, and the performance of the fracturing fluid is greatly improved; the high-performance guanidine gum fracturing fluid system for deep coal rock gas backlog fracturing, provided by the invention, has the characteristics of low component dosage, low cost, low residue content, good swelling performance, good resistance reduction performance, good sand carrying performance, controllable mixing construction and controllable online crosslinking, and can effectively meet the construction requirements of coal rock gas backlog fracturing.

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention relates to the technical field of petrochemical engineering, and discloses a temperature-resistant anti-swelling agent for fracturing and a preparation process thereof.The preparation method comprises the steps that glycerol triglycidyl ether and diethanol amine are subjected to a ring-opening reaction, a polyhydroxy tertiary amine monomer is obtained, then the polyhydroxy tertiary amine monomer and chloromethylated polystyrene are subjected to a quaternization reaction, and the temperature-resistant anti-swelling agent for fracturing is obtained. Quaternary ammonium salt groups of the anti-swelling agent and negative charges on the surface of clay form electrostatic interaction, and hydroxyl groups and the surface of the clay form hydrogen-bond interaction, so that the anti-swelling agent can be firmly adsorbed on the surface of the clay to form a layer of polymer film, the clay is prevented from being in contact with water, the phenomenon that the clay swells when encountering water is effectively inhibited, and the anti-swelling rate is very high. And the anti-swelling agent contains a heat-resistant polystyrene molecular chain, has excellent high temperature resistance, can maintain good structural stability at high temperature, still maintains high anti-swelling rate, and is suitable for a fracturing fluid system for high-temperature oil reservoir exploitation.

A method comprises hydraulically fracturing a subterranean formation by introducing a fracturing fluid comprising coke proppant particles and a carrier fluid into the formation, where the carrier fluid has a base viscosity of at most 0.8 centipoise (cP) at 25 degrees Celsius (° C.). A hydrocarbon well comprises a wellbore that extends within a formation, a production casing string that extends within the wellbore, perforation clusters formed within the production casing string, hydraulic fractures formed in the formation proximate to the perforation clusters, and a fracturing fluid comprising coke proppant particles and a carrier fluid within at least a portion of the hydraulic fractures, where the carrier fluid has a base viscosity of at most 0.8 cP at 25° C. Another method comprises providing a carrier fluid having a viscosity of at most 0.8 cP at 25° C. and forming a fracturing fluid comprising the carrier fluid and coke proppant particles.

The invention discloses a high-strength low-density proppant as well as a preparation method and an in-situ generation method thereof. The proppant is prepared by compounding recycled glass fiber reinforced plastic powder or glass fiber powder with different meshes and recycled glass fiber reinforced plastic powder in different proportions and blending a styrene system / unsaturated polyester resin system in different proportions. The glass fiber reinforced plastic powder as the filler can improve the mechanical properties of the proppant, such as strength and toughness. The matrix is made of polystyrene or unsaturated polyester or other high polymer materials and is low in density. Therefore, the proppant has the characteristics of high strength and low density. The invention discloses a preparation method of a high-strength and low-density proppant, which can produce the high-strength and low-density proppant with uniform particle size distribution on a large scale by adopting a suspension polymerization method, and can efficiently recover a large amount of glass fiber reinforced plastic wastes. The suspension polymerization method is simple to operate, the produced proppant is high in roundness and sphericity, the mining cost of a coal-bed gas well can be reduced, and the yield of coal-bed gas can be increased.

A hydraulic fracturing process comprises, during a time interval T1, pumping a first fracturing fluid comprising first coke proppant particles into a subterranean formation, such that a first weight of the first coke proppant particles, WCP1, is pumped into the subterranean formation. The process also comprises, during a time interval T2 that occurs before or after T1, pumping a second fracturing fluid differing from the first fracturing fluid and comprising non-coke proppant particles and optionally second coke proppant particles into the subterranean formation, such that a second weight of the second coke proppant particles, if any, WCP2, is pumped into the subterranean formation, where WCP1 / WCP2≥1.2.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention provides well killing fluid for preventing carbon dioxide gas channeling and a preparation method and application thereof, and relates to the technical field of oil and gas exploitation. The kill fluid for preventing carbon dioxide gas channeling comprises polyethylene glycol, sodium humate, sodium lignin sulfonate and paraformaldehyde, polyethylene glycol is used as a main raw material, sodium humate, sodium lignin sulfonate and paraformaldehyde are compounded, polyethylene glycol cannot be degraded after encountering carbon dioxide acid gas, and the carbon dioxide gas channeling is prevented. Paraformaldehyde plays a role of a cross-linking agent in a well killing fluid solution, other raw materials are cross-linked together to form gel with a net-shaped body structure, and the viscosity of the well killing fluid is increased to prevent gas channeling. The well killing fluid for preventing carbon dioxide gas channeling is not affected by acid-base gas and not limited by unbalanced formation pressure, and when the well killing fluid encounters carbon dioxide gas, carbon dioxide can be rapidly captured, reacts with other raw materials in the well killing fluid and blocks a gas channeling layer.