39results about How to "Good shear thinning" patented technology

The invention discloses a method for in-situ preparing antibacterial supermolecule aquogel. The method comprises the following operation steps: silver nitrate crystal and polyethyleneglycol-polypropylene glycol-polyethyleneglycol triblock copolymer solution are mixed and stirred to obtain mixed solution; the steps of stirring the mixed solution for 15 minutes and ultrasonically dispersing the mixed solution for 5 minutes are alternatively carried out for 2-4 hours to obtain nano silver sol; and the nano silver sol and Alpha-cyclodextrin solution are mixed, stirred and stands at the room temperature to obtain hydrogel. The hydrogel can be used for preparing injectable drug carriers. The invention has the advantages of simple operation, adjustable gel strength and the gelation time, room temperature forming, no involvement of chemical cross linking reaction and the usage of organic solvent, favorable biocompatibility and antibacterial property of obtained gel, and the like and is prospective to be widely applied in the field of biomedical engineering materials.

The present invention provides a temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and a preparation method thereof. The gel leak-stopping agent of the present invention has the following advantages that: the gel leak-stopping agent has extra-wide temperature adaptability, can adapt to a temperature range of 25-180 DEG C, and can meet requirements of oil field construction; the gel leak-stopping agent has rapid dissolution rate, and forms the structure type gel with good shear thinning behavior after dissolving, wherein the structure type gel is the liquid whichcan be pumped and flow; the gel leak-stopping agent does not require cross-linking; the real fluid leak-stopping is realized; the construction is convenient; the product is completely dissolved in water, no precipitate and flocculent insoluble matter are generated during the whole process, no insoluble matter is generated after the product is degraded, such that the flow back is easy or the flow back is not required, the reservoir is not damaged; the product is safe and environmental protection, and is synthesized by the multi-stage initiation, such that the product conversion rate is high, the stability is good, no toxic damage is generated to the stratum, the production layer can be protected.

The invention relates to a self heat-generating and gas-generating clean fracturing fluid comprising the raw materials of, by mass: 0.2-0.5% of a thickening agent, 2-4% of a structural enhancer, 2-15% of a heat generating agent A, 2-10% of a heat generating agent B, 2% of a structural enhancer solvent, 1-5% of a heat generating catalyst, 0.1-1% of a cleanup additive, 0.05-1.0% of a gel breaker, 0.05-0.15% of a broken plastic additive, and balance of water. The fracturing fluid has good temperature resistance, good shearing resistance, and sand-carrying property. The fluid can automatically generate heat and gas, such that the fracturing fluid is foamed in stratum. The fluid has low filtration loss. Gel breaking can be carried out with conventional persulfate and stratum oil, gas, and water dual gel breaking manner. Quick flow-back after pressure can be realized, and low-pressure oil and gas well self-spraying flow-back effect can be greatly improved. No residue and low harm is caused. The fracturing fluid can be used in fracturing modification of middle-shallow-stratum high-pour-point oil, crude oil with high viscosity, and low-pressure low-permeability oil and gas reservoirs.

The present invention discloses a seawater-based fracturing fluid and a preparation method thereof. 100 parts of the fracturing fluid comprises, by weight, 0.3-0.8 part of a thickener, 0.1-0.6 part of a cross-linking agent, 0.05-0.1 part of an oxygen scavenger, 0.02-0.05 part of a tackifying auxiliary agent, 0.05-0.2 part of gel breaker, and the balance or part of seawater, wherein the thickener modified polyacrylamide is formed by carrying out copolymerization on acrylamide, a hydrophobically modified monomer and a sulfonate, the hydrophobically modified monomer is dodecyl alkyl halide, and the cross-linking agent is an organic zirconium cross-linking agent or an organic titanium-zirconium composite cross-linking agent. According to the present invention, with the seawater-based fracturing fluid and the preparation method thereof, the technical problems of being incapable of continuously mixing, insufficient tackifying performance, poor salt resistance and poor shearing resistance of the seawater-based fracturing fluid in the prior art are solved; and the seawater-based fracturing fluid with characteristics of good tackifying, strong salt resistance, strong shearing resistance and continuous mixing and suitable for offshore oil fields is provided.

The invention provides a hydrophobic monomer and a preparation method thereof, wherein the structural formula of the monomer is as shown in the formula I. The invention also provides hydrogen for drilling leaking stoppage, which is prepared from reaction raw materials comprising alkenyl amide, alkenyl carboxylate, alkenyl sulfonate, a surfactant, the monomer and an initiator by a free-radical micelle polymerization method. The hydrogel has high apparent viscosity and high shear dilutability under a low shear rate before gelatinization, has excellent dilution resistance after gelatinization, has the advantages of simple production process and low cost, and is favorable for industrialized production and on-site popularization and application.

The invention provides an association type high-temperature resistant fracturing fluid suitable for volcanic rock fracture. The fracturing fluid comprises two parts, namely a base liquid and construction additives. The base liquid comprises following components by weight: 0.5-0.9% of a thickening agent and 0.2-0.3% of a flow promoter, with the balance being water. The construction additives comprise a thickening auxiliary agent and a gel breaker. The thickening auxiliary agent is 0.25-0.45% by weight of the base liquid. The gel breaker is 0.02-0.05% by weight of the base liquid. The fracturing fluid belongs to supramolecular structure fluids, and has good viscoelasticity, thus achieving viscoelastic sand carrying. The fracturing fluid has characteristics of capability of being clean and free of residue, good temperature resistance, shearing resistance, shearing dilutability, and the like. During fracturing construction, the fracturing liquid can reduce friction so as to reduce the construction pressure, and the fracturing liquid is low in harm to a reservoir stratum, thus increasing the success rate of fracturing construction, improving fracturing effects, and increasing the productivity of the reservoir stratum. The fracturing liquid is suitable for fracturing transformation of a volcanic rock reservoir stratum.

The invention relates to a water-based industrial cleaning agent. The water-based industrial cleaning agent comprises the following components in percentage by weight: 0.1-40% of an N-acyl amino acidanionic surfactant, 0.1-20% of fatty acid methyl ester ethoxylate, 0.1-8% of alkyl glycoside, 0.1-8% of hydroxypropyl methyl cellulose, 0.1-10% of an auxiliary agent, and 30-89% of water. The cleaningagent has the characteristics of simple formula, safe use, environment-friendliness and the like, has little irritation to skin, low toxicity, good biodegradability, good use stability and storage stability, and can further improve the traditional cleaning process and improve the cleaning quality while reducing sewage discharge and environmental protection pressure.

The invention relates to a method for preparing high-strength supramolecular hydrogel. The method comprises the following steps: (1) synthesizing polyethylene glycol-polycaprolactone-polycationic copolymer; (2) preparing a copolymer/nucleic acid composite liquid; and (3) mixing the copolymer/nucleic acid composite liquid obtained in the step (2) and an alpha-cyclodextrin liquid to prepare the high-strength supramolecular hydrogel. The invention also relates to the high-strength supramolecular hydrogel prepared by the method and an application of the hydrogel. The hydrogel forming process does not have chemical crosslinking reactions, the influence of chemical crosslinking reaction by-products on the activity of nucleic acid can be effectively avoided, the hydrogel has an effective gene transfer effect, the preparation method is convenient and quick, the hydrogel can be formed at room temperature, and the bioactivity of an embedded gene and the biocompatibility of a material can be kept. According to the hydrogel, the defect of quick degradation of current similar gel materials can be overcome, the nucleic acid can be released for more than 2 weeks, and the aim of long-time durable transfection can be achieved.

The invention discloses underground coal mine while drilling collapse prevention flushing fluid and a preparation method thereof, and is mainly applied to the underground coal mine drilling construction process. The while drilling collapse prevention flushing fluid adopts a formula that 3 to 4kg of a thickening main agent, 4 to 5kg of an auxiliary thickening agent, 4 to 5kg of a flocculant, 3 to 5gk of biological enzyme, and 40 to 50kg of bentonite are added into each cubic meter of water. The underground coal mine while drilling collapse prevention flushing fluid is simple in preparation method and excellent in effect, has excellent rheological property, collapse prevention wall building property and degradability, and meanwhile has high shear force and coal slag carrying capacity.

The invention discloses a flow pattern regulator for an oil-based drilling fluid and a preparation method. The flow pattern regulator comprises the following raw materials in parts by weight: 4-8 parts of isocyanate, 50-85 parts of polyether polyol, 0.5-5 parts of a small molecular amine compound, 0.1-0.5 part of a catalyst and 5-40 parts of a solvent. The flow pattern regulator for the oil-baseddrilling fluid in the invention has good sand suspending capacity at a low shearing rate; under the condition of a high shearing rate, the flow pattern regulator has good dynamic sand carrying capacity, is beneficial for a rapid drilling stage, keeps a well in a good clean state and improves drilling quality and drilling speed; and the flow pattern regulator is particularly applicable as a flow pattern regulator in oil-based drilling fluid systems with high requirements on static sand suspending and dynamic sand carrying, such as horizontal wells and extended reach wells.

The invention provides a joint lubricant. The joint lubricant is gel prepared from the following components in parts by weight: 13-20 parts of 2-methacryloyloxyethyl phosphorylcholine, 6-10 parts of methylene bisacrylamide, 170-256 parts of Tween 80, 159-239 parts of Span 80, 2.4-3.7 parts of ammonium peroxydisulfate, 12-19 parts of tetramethylethylenediamine, 4000-6000 parts of deionized water and 5248-7858 parts of hexane. The joint lubricant has excellent shearing thinning performance, has relatively high viscosity under an unstressed effect, and has the viscosity reduced along with increase of the shearing rate under a stressed effect. Hereby, the gel perhaps has excellent supporting effect when a patient stands still, but relatively low viscosity when the patient walks to reduce friction, and thus has durable and strong lubricating effect. The injection microgel prepared by the method can be used as a new choice for intervention of patients with early osteoarthritis.

The invention provides a drilling fluid as well as a preparation method and application thereof. The drilling fluid is prepared from the following components in percentage by mass: 2-5% of bentonite,0.1-0.2% of sodium hydroxide, 0.2-0.9% of a polymer coating agent, 1-2% of a polymer filtrate reducer, 0.2-1% of a gelatinizing agent, 1-2% of a film-forming agent, 1-3% of an asphalt anti-collapse agent, 0.5-2% of emulsified liquid paraffin, 1-3% of amino modified polyether polyol, 3-7% of potassium chloride, 1-3% of a lubricant and 8-50% of limestone powder, and the balance being water. The density of the drilling fluid is 1.1-1.3 g/cm<3>. When the drilling fluid is used for drilling, the drilling speed can be increased, the purposes of stabilizing the wall of a shale stratum and reducing the pressing effect of rock debris can be achieved, and the drilling fluid is particularly suitable for drilling of a shale-containing stratum.

The invention relates to microbial fermentation, in particular to an improved method for preparing Dingyou glue from Sphingomonas sp. The method comprises the following steps that: sterilized cultureliquid containing carbon sources and nitrogen sources is inoculated with Sphingomonas sp. CGMCC No. 9531; the pH value of the culture liquid is regulated for ventilation and stirring fermentation; after the fermentation is finished, fermentation liquid is pretreated and extracted to obtain the Dingyou glue; in the fermentation process, the technological means of controlling the inoculation quantity and the pH value, regulating the carbon nitrogen ratio and the like are used; in the extraction process, the technological means of using the fermentation liquid for adjusting the pH value, raisingthe temperature and the like are used. The method solves the technical problems of poor salt tolerance, poor rheological property and the like of products in the prior art, and has the advantages of good salt tolerance and good rheological property of the Dingyou glue, high product whiteness, low production cost, high production safety and the like.

The invention provides a hydrophobic monomer shown in a formula 1 and a preparation method thereof. The invention further provides a high molecular polymer and a preparation method thereof. Besides, the invention also provides leaking stopping gel containing the high molecular polymer. The leaking stopping gel provided by the invention has the advantages of appropriate gelation time, good shear dilutability, high water dilutability resistance, and capability of meeting the demand of leaking stoppage on-site construction.