473results about How to "Good viscosity increasing effect" patented technology

The invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g/L, the crosslinking agent concentration of 0.01 to 1.0g/L, the surfactant concentration of 0.01 to 8mmol/L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g/L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.

The invention discloses acrylamide modified polymer micro-crosslinking gel and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps that: acrylamide modified polymer PAE containing functional macro monomer is prepared into an aqueous solution with the concentration between 0.1 and 4g/L, the concentration of crosslinking agent between 0.01 and 1.0g/L, the concentration of surface active agent between 0.01 and 8mmol/L and the concentration of heat stabilizer sodium sulfite between 0.005 and 1.0g/L; the aqueous solution is added in a mixing container with a stirring device and is stirred evenly at room temperature; the pH value of the solution is adjusted between 4 and 11 to prepare a polymer solution system of the acrylamide modified polymer micro-crosslinking gel used for tertiary oil recovery and displacement, oil displacement modification, profile modification or water plugging; and the polymer solution system undergoes micro crosslinking during flowing inside an oil layer to form the gel. The acrylamide modified polymer micro-crosslinking gel has ideal elasticity, difficult dehydration, stable performance and excellent performances on tackifying, temperature resistance, salt resistance, shearing resistance and ageing resistance.

The invention discloses a water soluble copolymer with high viscosity and salt resistance, and a preparation method and an application thereof. The preparation method comprises the steps of: adding acrylamide 20 weight parts, an anionic monomer or/and a cationic monomer 0.1-15 weight parts,, a vinyl polycyclic aromatic hydrocarbon 0.05-4 weight parts,, a surfactant 0.5-90 weight parts,, and deionized water 70-900 weight parts, into a three-neck reaction bottle, adjusting the solution pH to 2.5-9, introducing N2 for 30min, adding an initiator persulfate 0.001-0.2 weight parts, at 20-70DEG C, and reacting for 6-36 hours to obtain a low-molecular weight water soluble copolymer with molecular association ability, high viscosity and salt resistance, which can be used in intermediate-permeability oil reservoir and low-permeability oil reservoir development. An associated water soluble polymer oil displacement agent is obtained by preparing the copolymer into an aqueous solution with copolymer concentration of 0.3-3 g/L and surfactant concentration of 0.01-4 mmol/L, adding into a mixer with a stirring device, and stirring uniformly at room temperature; and the obtained oil displacement agent has high viscosity, salt resistance, temperature resistance and shear resistance, and can be used in intermediate-permeability oil reservoir and the low-permeability oil reservoir development.

The invention relates to a temperature and salt resistant copolymer KWKY-PAD for oil field and a preparation method thereof, and mainly solves the problem that polyacrylamide is easy to hydrolyze at high temperature and high salinity in the prior art. The temperature and salt resistant copolymer KWKY-PAD as shown in formula (I) is obtained by the copolymerization of acrylamide and a N-alkyl substituted acrylamide derivative. The technical scheme provided by the invention greatly solves the problem. By the adoption of the preparation method, the hydrolytic stability of the copolymer is raised,and the copolymer has good viscosifying ability and hydrolytic stability at high temperature and high salinity as well as good temperature and salt resistance. The copolymer provided by the inventioncan be used in an oil displacement agent for oil extraction in oil field, and also can be used in oil field application fields of a thickening agent of fracturing fluids, a water plugging profile modification agent, a drilling fluid processing agent and the like. In addition, the preparation method requires less monomer, is simple and is suitable for industrialization.

The invention discloses a viscosifier for drilling fluid and a preparation method thereof. An amphiprotic hydrophobic association type water-soluble viscosifier for drilling fluid is prepared by steps of mixing water-soluble monomers with hydrophobic monomers to perform a polymerization reaction, wherein the water-soluble monomers and the hydrophobic monomers have different ion categories. Amphiprotic ionic groups simultaneously exist in the structure of the viscosifier for drilling fluid provided by the invention to effectively absorb or bridge clay particles so as to guarantee an excellent tackifying effect; meanwhile, the ionic water-soluble monomers can be used for greatly improving the content of hydrophobic units in the polymer structure through hydrophilic ionic groups on the condition of high macromolecular water-solubility; and the ionic hydrophobic monomer units are introduced to guarantee the tackifying effect and water loss reduction effect of the viscosifier under high-temperature and high-salt conditions through hydrophobic association. As shown in an experimental result, the viscosifier provided by the invention still has excellent tackifying performance when the temperature is as high as 260 DEG C, and meanwhile, the viscosifier has excellent high-temperature and high-pressure water loss performance, so that the viscosifier has extensive practical application prospect and economic benefit.

The invention relates to a compounding method to form water solubility intermolecular association ternary hydrophobic association polymer that includes acrylamide, sodium acrylate, and allyl-alkylphenyl aether three constructions. The method includes the following steps: using acetone as reacting solvent, alkylphenols and allyl chloride as raw material, benzyl triethyl ammonium chloride as phase-transfer catalyst, reacting for 4-8 hours at 40-60 degree centigrade to form drainage monomer allyl-alkylphenyl aether; adding sodium acrylate, acrylamide and allyl-alkylphenyl aether monomer into reactor according to the mol ratio as 20-30:69.2-79.2:0.8, adding inducing agent, sealing reacting for 2-6 hours to gain terpolymer. The terpolymer has good temperature resistance, saline tolerance, dissolubility and high temperature stability. The invention is easy to compound and has mild condition.

There is a method of high stickly thick water association polymer degreaser, its character is that the propylene acyl (AM)-natrium acrylate (NaAA)-N-p-butyl benzene propylene acyl (BPAM) thick water association water soluble polymer is confected into 0.1-0.3 wt% thickness, the thickness of surface active agent is 0.01-1 mmol/liter and the thickness of NaCL is 0.5-1.5 wt5, they are added into blending pot which has blender and thermometer, they are blended under 25-40 degree C equably, the degreaser is got.

The invention discloses a copolymer with temperature resistance and water solubility and the preparation method and application thereof, which is characterized in that: 20 portions of acrylic amide, 0.1 to 10 portions of anion monomer or/and cation monomer, 0.05 to 3 portions of fluorine-containing styrene or/and perfluoroalkyl styrene hydrophobic monomer, 0.5 to 60 portions of surface active agent and 50 to 700 portions of deionized water are put into a three-necked reaction bulb; after the solution pH is regulated to be equal to 2.5 to 9 and N2 is connected for 30 minutes, 0.001 to 0.2 portion of an evocating agent of persulfate is added under temperature of 20 to 70 DEG C, reacting for 6 to 36 hours, and PATF is prepared. Then water is used for diluting so as to prepare PATF concentrated solution, thus obtaining a copolymer that has medium molecular weight and water solubility, is high-temperature resistant, has an ability of molecular association and can be used in high temperature and high salinity reservoir. The copolymer is prepared into aqueous solution with a mass concentration of 0.3 to 3g/L and a surface-active-agent concentration of 0.01 to 4mmol/L, which is put in a blending container with a dasher and is stirred even at room temperature to prepare a polymer oil-displacing agent which is high-temperature resistant, high tackifying and anti-sharing and has excellent aging resistance under high salinity and the temperature of 110 DEG C. The prepared oil-displacing polymer has excellent solution properties owing to the supermolecular structure formed by the association between molecules of fluorine-containing cinnamene or/and alkylbenzene hydrophobic groups, thus having favorable application prospects in high temperature and high salinity reservoir exploitation.

The invention discloses a kind of hydrophobic association polyacrylamide and its preparative method. The product is the copolymer of acrylamide and dendritic I branch-like hydrophobic monomers, in which, the amount of monomeric unit of acrylamide is integer of 124013~139860, the amount of monomeric units of dendritic hydrophobic monomers is integer of 140~6527. In the invention, high degreed branching hydrophobic monomers are inlet on a chain of macromolecules by the way of micelles' copolymerization, the monomers can promote the capability of hydrophobic interaction of polymers' chain without any curling for its greater hydrophobic volume, so a better viscosity can be achieved. The content of the hydrophobic chain can be controlled by the way of controlling the amount of hydrophobic monomers to improve the solubility of copolymer

The invention provides a tackifier for a drilling fluid, and a preparation method and application thereof. The tackifier is a quadripolymer formed by polymerization of four alkene monomers, wherein the four alkene monomers are selected from a temperature-resistant salt-tolerant monomer, a hydrated monomer and an adsorptive monomer; the temperature-resistant salt-tolerant monomer is selected from an alkenyl sulfonic acid monomer; the hydrated monomer is selected from alkenyl carboxylic acid, alkenyl alkane ketone and double-bond-containing quaternary ammonium salt compounds; and the adsorptive monomer is selected from an alkenyl amide monomer. The tackifier provided by the invention can resist a high temperature of no less than 180 DEG C, is resistant to saturated salt, has remarkable tackifying effect, is low in toxicity and environmentally friendly, and can obviously improve the dehydration and wall building capability of the drilling fluid, thereby effectively reducing the dehydration. The invention solves the downhole complexity possibly caused by the fact that the drilling fluid system can not carry and suspend rock debris and thus can not clear boreholes in time due to reduced viscosity shearing force as a result of poor temperature resistance and salt tolerance of the tackifier in deep well, ultradeep well, horizontal well and extended reach well operations.

The invention relates to a polymer mobility control agent suitable for a high-temperature and high-salinity harsh reservoir and a preparation method of the polymer mobility control agent, and the polymer mobility control agent is mainly used for solving the problems that the polymer in the prior art is poor in heat and salt resistance and long-term stability, and cannot meet the requirements of tertiary oil recovery. In order to better solve the problems, the technical scheme adopted by the invention is as follows: an amphoteric hydrophobic association polymer is prepared from the following raw materials in parts by weight: 5-99.9 parts of a non-ionic water-soluble monomer, 0-50 parts of an anionic monomer or/and cationic monomer, 0.1-10 parts of a hydrophobic monomer with surface activity, 0-20 parts of a viscosity stabilizer and 0-20 parts of a surfactant. The preparation method can be applied to industrial production and application of the polymer mobility control agent for the high-temperature and high-salinity harsh reservoir.

A water-soluble zwitterionic copolymer contains two structure units: 2-methyl-2- acrylamido propanesulfonic acid and methyl acrylyloxyethyl trimethyl ammonium chloride. Its preparing process includes such steps as proportionally adding the anhydrate sorbitol monooleate and the anhydrated sorbitol monostearate to kerosene, proportionally dissolving two monomers in water and regulating its pH=7, proportionally mixing oil phase with water phase, filling N2, adding redox trigger, and redox reaction in constant-temp water bath.

The invention provides a water-based clean fracturing fluid for fracturing. The fracturing fluid is formed by a small canonic antiswelling agent, organic sodium salt, a cationic surface active agent and water, wherein the concentration of the small canonic antiswelling agent is 0.4 percent by mass, the concentration of the organic sodium salt is 0.06 to 0.18 percent by mass, the concentration of the cationic surface active agent is 0.2 to 0.6 percent by mass, the mass ratio of the cationic surface active agent and the organic sodium salt is 1:0.3, the organic sodium salt is sodium salicylate, and the cationic surface active agent is any one or the mixture of 16-18 alkyl-3-methylammonium chloride. The invention can well solve the pollution problem of the fracturing fluid to the coal bed, simultaneously improve the sand-carrying performance of the fracturing fluid greatly, the price thereof is only 1.5 to 2.0 times of active water fracturing fluid and is far lower than that of guargum fracturing fluid and common clean fracturing fluid.

The invention relates to a fracturing fluid thickening agent and preparation and application thereof. The thickening agent is mainly prepared from the following components in percentage by weight: 15-20% of acrylamide monomer, 6-10% of acrylic monomer, 3-6% of sodium carbonate, 3-8% of 2-acrylamide-2-methylpropanesulsonic acid, 1-4% of dimethyldiallylammonium chloride (60% aqueous solution), 0.03-0.08% of potassium persulfate and the balance of water. The preparation comprises the following steps of: adding the acrylic monomer and water into a reaction kettle; starting stirring and slowly adding sodium carbonate, wherein the adding speed is proper when the bubbles generated by the reaction do not overflow out of the reaction kettle; stirring till sufficient dissolution; adding 2-acrylamide-2-methylpropanesulsonic acid, and stirring till sufficient and uniform mixing; adding the acrylamide monomer and dimethyldiallylammonium chloride, and stirring till sufficient dissolution; heating the reaction liquid to 40 DEG C, introducing nitrogen, and performing thermal insulation stirring for 20 minutes; adding potassium persulfate; continuously introducing nitrogen, and stirring for 30 minutes; stopping the stirring, and reacting for 4 hours to obtain gel; and grinding the reaction product, drying and granulating to obtain the thickening agent.

The invention provides a temperature resist, salt resist crosslinked polymer system with controllable crosslinking time and strength, comprising water, polyacrylamide, melamine, formaldehyde and additive, wherein the polyacrylamide 0.03-8 weight%, melamine 0.01-4 weight%, formaldehyde solution(35-38weight%) 0.03-10 weight%, additive <2 weight%. The salt content of oilfield sewage is less than 35 *104mg/L, the total content of Ca2+ and Mg2+ is less than 5000mg/L. The temperature range of reservoir bed is 30-110 degree, the crosslinking time is 6 hours-25 days, and the viscosity after crosslinking is less than 40*104mPa.s. The long-term stability is good. The viscosity is greatly increased compared to oil displacement of polymer, suitable for reducing the use concentration of polyacrylamide and the cost is reduced, at the same time the oil displacement effect is increased and the treatment difficulty of output liquid is reduced. The crosslinked polymer system can be useful for recycling the polyacrylamide output liquid of high concentration. The invention can be used in oilfield profile controlling, exclusion of water, leak stopping and oil displacement technique. The locale preparation is simple.

The invention discloses an inorganic-organic salt-resisting and high temperature-resisting polymer fluid loss additive for drilling fluid, which is characterized in that: 2-acrylamide group-2-methyl sodium propanesulfonic acid, dimethyl diene propyl group ammonium chloride, acrylamide and sodium acrylate are used as main polymers, and inorganic salt is used as transformation temperature stabilizing agent. Aqueous solution is prepared according to a certain mass ratio, initiators are added for polymerization at certain temperature, so as to generate macromolecule polymer of elastic colloid, and after drying and grinding are carried out, a target compound is obtained. The additive is easy to dissolve in water, has good capacity of filtration loss reduction, temperature resistance, salt resistance, calcium resistance and magnesium pollution resistance, has good tackifying effect, can effectively control mud making of the stratum and inhibit the dispersion of clay and drilling cuttings, and has good compatibility with the common treating agents.

The invention discloses a concrete viscosity adjusting agent and a preparation method thereof. The concrete viscosity adjusting agent is prepared by copolymerizing a cationic monomer, an anion carboxyl monomer and an inner cross-linking agent together with a free radical, wherein the mole ratio of the cationic monomer to the anion carboxyl monomer and the inner cross-linking agent is 1:(0.5-5):(0.01-0.1). As the cationic monomer and the anion carboxyl monomer are adopted to copolymerize to obtain an amphoteric polymer, the concrete viscosity adjusting agent has remarkable antipolyelectrolyte property and is relatively good in viscosity improvement property; due to adoption of the inner cross-linking agent, three-dimensional net-shaped structures are formed among the viscosity adjusting agent and binding material grains, the concrete disintegration bleeding problem is greatly solved, and the peaceability of concrete is improved. The prepared concrete viscosity adjusting agent is good in compatibility with other additives, the strength development of concrete is not affected, and particularly the concrete disintegration bleeding problem can be effectively solved under the condition of low binding materials.

The invention belongs to the technical field of a chemical reagent for oil production, and discloses a viscosity-increasable profile control agent and a preparation method thereof. The profile control agent is obtained through adding functional monomers, inorganic nanometer particles, main crosslinking agents and auxiliary crosslinking agents into an acrylamide monomer water solution, introducing nitrogen gas to remove dissolved oxygen and adding initiators under the water bath condition of 40 to 60 DEG C for polymerization; after the polymerization is completed, pelleting, drying and crushing are performed; a final product is obtained. The prepared profile control agent can realize the continuous viscosity increase on formation water to achieve a certain displacement effect; meanwhile, good anti-salt performance is realized; the water absorption swelling can be generated in the high-concentration salt brine; after the expansion, high intensity is still realized, so that the high seepage layer in an oil deposit can be effectively sealed and plugged; the profile control effect is achieved.

The invention relates to an oil-displacement composition with improved injectivity, and a preparation method and application thereof. The main objective of the invention is to overcome the problems of poor injectivity at zones near a well on site due to proneness to obstruction at pore throats of strata caused by strong adsorption effect of hydrophobic associated polymers on the surface of sandstone. The oil-displacement composition with improved injectivity comprises, by weight, 0.01 to 1 part of an anti-adsorption agent, 0.3 to 3 parts of a hydrophobic associated polymer and 96 to 99.69 parts of water, wherein the anti-adsorption agent is at least one or a mixture of two or more selected from a group consisting of nonionic surfactants and anionic surfactants. The oil-displacement composition provided by the invention perfectly overcome the above-mentioned problem and can be used for on-site injection of a polymer fluidity control agent into a high-temperature high-salt severe oil reservoir for oil displacement.

The invention relates to adamantyl contained hydrophobic association zwitter-ion starch and a preparation method thereof. The zwitter-ion starch is prepared from raw materials of starch, adamantyl hydrophobic monomer, alkenyl amide, alkenyl carboxylate and alkenyl quaternary ammonium salt. According to the invention, the adamantyl hydrophobic monomer is introduced to polymer molecules, so that the modified starch has a hydrophobic association property and the viscosity increasing capacity of the starch is increased. As an anion group and a cation group are introduced in the starch molecule chain simultaneously, the anti-polyelectrolyte effect of the solution is enhanced and the salt resistance is improved.

This invention discloses slurry for protecting the walls during nonexcavating drilling. The slurry comprises: water 100 parts, bentonite 3-10 parts, and slurry-treating agent 0.75-2.5 parts. When the bentonite is calcium soil, the slurry-treating agent comprises sodium carbonate, Na-CMC and biotreating agent, and the proportions are: calcium soil 5-10 parts, sodium carbonate 0.25-0.5 part, Na-CMC 0.25-1 part, and biotreating agent 0.25-1 part. When the bentonite is sodium soil, the slurry-treating agent comprises Na-CMC and biotreating agent, and the proportions are: sodium soil 3-8 parts, Na-CMC 0.3-0.6 part, and biotreating agent 0.6-1.5 parts. The biotreating agent is Marchilus pauhoi gum, and Na-CMC is medium viscosity sodium carboxymethylcellulose. The slurry can avoid the difficulties in drilling and expanding the holes, as well as hole caving and pipe sticking.