51results about How to "Enhanced hydrophobic association" 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 polyurethane associated thickener, and a preparation method and application thereof. The preparation method comprises the following steps: adding polyether polyol and methylbenzene to a reaction container under protection of nitrogen, heating up to 110-130 DEG C, and drying and dewatering in vacuum for 2-4 hours; adding a catalyst and diisocyanate after cooling to 30-50 DEG C, heating up to 50-80 DEG C and reacting for 2-6 hours, so as to obtain a methylbenzene solution of a polyurethane prepolymer; adding a chain extender to expand the chain, reacting for 2-6 hours, and then adding a hydroxyl-containing dendric molecule capping agent; heating up to 60-100 DEG C and reacting for 2-8 hours, and then adding a precipitator petroleum ether or normal hexane; drying the sediment in vacuum to finally obtain white solid powder, namely the polyurethane associated thickener. By adopting the polyurethane associated thickener, the viscosity of an emulsion paint can be effectively improved at low dosage, so that the emulsion paint has high viscosity in a low shear state, and also has the characteristic of low construction viscosity in a high shear state; the polyurethane associated thickener has a better application prospect.

The invention discloses a surface-active two-tailed hydrophobic associated polymer and a preparation method thereof; the surface-active two-tailed hydrophobic associated polymer is prepared via micellar free radical copolymerization: adding a surfactant, sodium lauryl sulfate, and a hydrophobic monomer, N-phenethyl-N-alkyl (methyl) acrylamide or N-benzyl-N-alkyl (methyl) acrylamide into the aqueous solution of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and surface-active macromonomer polyoxyethylene lauryl ether (methyl) acrylate, using the surfactant to solubilize the hydrophobic monomer in the formed micelle, using sodium hydroxide to adjust pH to 6-8, and copolymerizing the hydrophobic monomer and a water-soluble monomer by means of photo-initiation. The properties, such as tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, of the polymer can be effectively improved, the preparation method and principle of the polymer are reliable, and the preparation method is simple to perform and has a promising application prospect.

The invention discloses a sulfonate lycine type hydrophobic associated polymer and a preparation method thereof. A preparation process of the sulfonate lycine type hydrophobic associated polymer comprises the following steps that firstly, acrylamide and acrylic acid are mixed in an aqueous solution, and the pH of a system is regulated to be around 6 to 8; secondly, 3-(dimethylamino propyl methacrylamide)propanesulfonate, N-aryl-N-alkyl(methyl)acrylamide and lauryl sodium sulfate are added and stirred until the solution is clear; and thirdly, after nitrogen is led in for deoxidization, a photoinitiator azobis(isobutylamidine hydrochloride) is added for polymerization under photoinitiation conditions. Since advantages of a double-tail hydrophobic associated polymer and advantages of a lycine type polymer are combined, the viscosifying capability, the temperature endurance, the salt resistance and the hydrolysis resistance of the sulfonate lycine type hydrophobic associated polymer are remarkably improved, the sulfonate lycine type hydrophobic associated polymer can be used for an oil-displacing agent or an acidizing and fracturing thickener used for increasing a crude oil recovery rate in oilfield development, and the preparation method of the sulfonate lycine type hydrophobic associated polymer has the advantages of reliable principle, easiness in operation and wide market prospect.

The invention relates to a terpolymer used for resisting temperature and displacing oil and a preparation method thereof, the method comprises the following steps: introducing a hydrophobic monomer containing triphenyl in an acrylamide copolymer, preparing acrylamide, a sulfonic acid monomer and a hydrophobic monomer to obtain an aqueous solution, adding a complexing agent and an urea aqueous solution, then adding an emulsifier to prepare an emulsion, adding an initiator in the emulsion, polymerizing to obtain a rubber block, removing the rubber block, cutting, granulating, crushing, and sieving to obtain the terpolymer finished product. According to the terpolymer and the preparation method, the hydrophobic monomer containing triphenyl is introduced in a macromolecular chain, and thereby the viscosifying capacity and heatproof performance of the polymer can be increased.

The invention discloses an acid liquid thickener and a preparation method thereof, and belongs to the technical field of oil field acidification. The acid liquid thickener has the following chemical structure formula described in the specification, wherein the value of x to y to z is (200000-300000) to (50-500) to (2-13), and n is an integer of 5-25. The viscosity-average molecular weight of the acid liquid thickener is 6000000-12000000. The acid liquid thickener has the characteristics of being capable of reduction of the friction resistance with an acid liquid pump, good high-temperature resistance, good shear resistance and the like.

The invention discloses a hydrophobic modified organic/inorganic composite flocculant and a preparation method and application thereof. The structural formula of the hydrophobic modified organic/inorganic composite flocculant is as follows: R1 is Al or Fe or Ti, R2 is-NH (CH2) 2CH3 or-NHCH (CH3) 2, n ranges from 4.012 to 19.47, and the value range of x: y is (3.1 to 12.4): 1. The flocculant has both inorganic groups and organic groups, improves the defect of insufficient charge density of a single flocculating agent, and improves the electric neutralization characteristic so that the flocculation speed of the composite flocculating agent is increased, the effective flocculation range is widened, and the floc settling performance is good; the nanocrystallization flocculant has the advantages of multiple surface atoms, large particle specific surface area, high specific surface energy and the like, and the flocculation performance of the flocculant on pollutants is further improved; in addition, the flocculating agent subjected to moderate hydrophobic modification has excellent flocculation performance on micromolecular organic pollutants containing hydrophobic functional groups in awater body, and is wide in application range.

The invention provides benzyl-contained cationic polymerizable surface activated monomer, which comprises the following molecular structure: in the formula, X is of a halogen anion; and R1 to R4 are respectively alkyl with 1-8 hydrogen atoms and carbon atoms, alkoxy or substituted phenyl with 1-8 carbon atoms. The invention further provides a preparation method for benzyl-contained cationic polymerizable surface activated monomer and ionic copolymer containing the benzyl-contained cationic polymerizable surface activated monomer unit. The benzyl-contained cationic polymerizable surface activated monomer has surface activity, and can be aggregated to form micelle in aqueous solution, and carries out copolymerization with hydrophilic monomer on the concentration of the aggregated micelle to obtain microblock property of the ionic copolymer; and the benzyl-contained cationic polymerizable surface activated monomer can also be used as emulsifier for carrying out emulsion copolymerization with hydrophobic monomer in the aqueous solution so as to prepare functionally ionic copolymer.

The invention relates to the field of crude oil recovery, and discloses a polymer having a surface activity function, and a preparation method and application thereof. The polymer contains a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit having a structure shown in Formula (1); the structural unit B is a structural unit having a structure shown in Formula (2); and the structural unit C is a structural unit having a structure shown in Formula (3). According to the invention, a polymerizable monomer having surface activity is introduced onto a macromolecular chain, and the ether chain structure determines that the synthesized copolymer has high hydrolysis resistance and thermal stability, thereby improving the aging resistance of the polymer; and meanwhile, the surface tension and interfacial tension of the polymer solution are greatly reduced, so that the polymer has favorable surface activity and fine compatibilization, emulsification and oil washing capabilities, thereby improving the crude oil recovery factor. The Formula (1), the Formula (2) and the Formula (3) are shown in the specification.

The invention relates to a benzene-ring-containing modified acrylamide water-soluble amphoteric polymer and a preparation method thereof. Amphoteric monomer methylacryloyloxyethyl-N,N-dimethylpropyl sulfonate (DMAPS), hydrophobic monomer methyl styrene (alpha-MST) and acrylamide (AM) are copolymerized in a lauryl sodium sulfate (SDS) emulsion by using potassium persulfate (KPS) as an initiator. Due to the introduction of the benzene ring structure comprising large steric hindrance, the water-soluble hydrophobic association polymer prepared by the method has the advantages of excellent hydrophobic associativity, excellent surface activity and excellent temperature/salt/shear resistance, can be used as a high molecular surfactant, and has wide application potential in the fields of oil-gas exploitation, paints, medicine and the like.

The invention relates to a supramolecular star polymer taking beta-CD as a core and a preparation method of the supramolecular star polymer. The supramolecular star polymer takes a beta-cyclodextrin modified branched monomer F-beta-CD as an inner core and is grafted with acrylamide, acrylic acid, a hydrophobic monomer and a surface active macromonomer; the hydrophobic monomer is one or more of N-benzyl-N alkyl (methyl) acrylamide and N-phenethyl-N alkyl (methyl) acrylamide; the surface active macromonomer is one or more of allyl polyoxyethylene ether, alkylphenol polyoxyethylene ether (methyl) acrylate, alkylphenol polyoxyethylene ether allyl ether, alkyl alcohol polyoxyethylene ether (methyl) acrylate and alkyl alcohol polyoxyethylene ether allyl ether. The preparation method has the advantages of cheap and easily available raw materials, easily controllable synthesis conditions and high yield. The tackifying agent has excellent tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, and shows good application prospects in the aspects of oil field recovery efficiency improvement and hydraulic fracturing.

The invention discloses a polymer having surface activity function, a preparation method and an application thereof. The polymer contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is shown in a formula (1), the structural unit B is shown in a formula (2), the structural unit C is shown in a formula (3), by taking the weight of the polymer as a reference, the content of the structural unit A is 5-60 wt%, the content of the structural unit B is 30-90 wt%, the content of the structural unit C is 0.1-10 wt%; and the viscosity average molecular weight of the polymer is 18 million-28 million. The polymer has the advantages of good water solubility, strong tackifying ability, and heatproof salt-resistance performance and good surface activity, so that the polymer has good oil-washing effect, and can be used as an oil displacement polymer of mid-low permeability reservoir.

The invention relates to the field of crude oil extraction, and discloses an oil displacing polymer with the surface activity and a preparing method and application thereof. The polymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit with the structure shown in the formula (1), the structural unit B is a structural unitwith the structure shown in the formula (2), and the structural unit C is a structural unit with the structure shown in the formula (3). According to the oil displacing polymer with the surface activity and the preparing method and application thereof, a hydrophobic monomer and a hydrophilic monomer are jointly introduced into a macromolecular chain of polyacrylamide to prepare a novel polymer with the surface activity, and the obtained novel polymer with the surface activity has the improved tackifying performance and emulsifying performance, the reduced surface and interfacial tension and the like. The formulas are defined in the description.

The present invention provides a water-based drilling fluid filtrate loss reducer based on modified plantain seed husks and a preparation method thereof. The water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks includes plantain seed husk powder, NaOH, 95% ethanol, chloroacetic acid, hydrophobic nano-calcium carbonate and water. The water-based drilling fluid filtrate loss reducer is prepared by crushing, purification, alkalization and carboxymethylation of the plantain seed husks with high filtrate loss reducing effect and plugging performance, and combination with the hydrophobic nano-calcium carbonate, and the water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks is finally formed by hydrophobic interaction to improve system anti-temperature ability and filtrate loss reducing effect. The water-based drilling fluid filtrate loss reducer has obvious effects. After the water-based drilling fluid filtrate loss reducer is aged at 150 DEG C for 24 hours, the filter loss is remained at a relatively low level (4.3 mL). At the same time, the water-based drilling fluid filtrate loss reducer is non-toxic and has no adverse effect on the environment. The acute toxicity EC50 is greater than 50,000, and the water-based drilling fluid filtrate loss reducer can be completely degraded. The water-based drilling fluid filtrate loss reducer is an efficient drilling fluid filtrate loss reducer. The method has the advantages of being simple, easy in operation and easy in popularization.