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1916results about How to "Improve salt tolerance" patented technology

Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

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.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Hydrophobically associating polymer and mixed surfactant binary compound oil displacement system

The invention relates to a hydrophobically associating polymer and mixed surfactant binary compound oil displacement system for use in tertiary oil extraction. The system mainly comprises the following components in percentage by weight: 0.1 to 0.3 percent of hydrophobically associating polymer, 0.1 to 0.6 percent of surfactant and 99.2 to 99.8 percent of water. The hydrophobically associating polymer in the system has high temperature resistance, high salt resistance and viscosity increasing capacity and can largely reduce dosage of polymer; and with high solubilizing capacity, the polymer can increase the dissolution of the surfactant in sewage, thereby increasing the use concentration of the surfactant. The oil displacement system which is dissolved by sewage from extraction can save lots of fresh water; with high viscosity increasing capacity, the system can effectively control flow rate, increase swept volume, increase oil water interface tension to 10<-3>mN / m and increase the oil extraction rate; and because of high stability and injection property, the system can be injected in large dose. According to an indoor oil displacement experiment, the binary compound oil displacement system can improve the extraction rate by over 20 percent compared with that of water displacement. The system without alkali avoids serious damage to the oil layer and corrosion and damage to oilpipes and has a great application prospect.
Owner:SOUTHWEST PETROLEUM UNIV

Polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent and preparation method thereof

InactiveCN103525379ANew features of strong high temperature resistanceGood temperature and salt resistanceDrilling compositionPolymer scienceEmulsion polymerization
The invention discloses a polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent and a preparation method thereof. According to the preparation method, in the presence of nano-silica, a polymer-base nanometer composite material with amphiphilic block hydrophobic associating polymer wrapping inorganic nano-silica is successfully synthesized by virtue of a micellar emulsion polymerization method and combines the rigidity and the heat stability of the inorganic nano-silica and the characteristics of the amphiphilic block hydrophobic associating polymer together, and the temperature resistance, the salt tolerance and the thickening property of the polymer are obviously improved by virtue of the polymer-base nanometer composite material on the basis of the existing good performances of the amphiphilic block hydrophobic associating polymer. As a temperature-resistant, salt-tolerant and fluid loss reducing agent for a drilling fluid in the drilling engineering, the polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent has a remarkable fluid loss reducing effect under high temperature and high salinity.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Method for preparing functional gold nanoparticles with high stability

The invention discloses a method for preparing functional gold nanoparticles with high stability, which belongs to the technical field of material chemistry. The method comprises the following steps of: the DNA-assisted synthesis of the gold nanoparticles, the salt tolerance experiment of the synthesized gold nanoparticles, the representation of the synthesized gold nanoparticles and the biometric identification of the DNA on the surfaces of the gold nanoparticles. In the method, four kinds of DNAs with three different lengths are utilized and a chloroauric acid is reduced by trisodium citrate to realize the assisted synthesis of the gold nanoparticles; the DNAs of 12 basic groups are obtained by performing representation with an electron microscope to assist in synthesizing the uniform spherical gold nanoparticles, and particularly, the gold nanoparticles obtained by the 12-G-assisted synthesis have regular shapes and a uniform particle size; the salt-tolerant effect of the gold nanoparticles obtained by the salt tolerance experiment of the synthesized gold nanoparticles can be bettered by 20 times; and the gold nanoparticles can enhance the fluorescence of FAM-DNA, and are expected to be well applied to the preparation of nanometer medicaments and nanodevices.
Owner:JIANGNAN UNIV

Pre-crosslinking swellable profile control agent, preparation method and application

The invention discloses a pre-crosslinking swellable profile control agent, a preparation method and application, and belongs to the technical field of oilfield chemistry. The pre-crosslinking swellable profile control agent is prepared from, by mass, 20-40 parts of mixed monomers, 0.01-0.05 part of a cross-linking agent, 3-8 parts of a reinforcing agent and 0.01-0.04 part of an initiating agent. The mixed monomers are prepared from acrylamide, acrylic acid and 2-acrylamido-2-methyl propanesulfonic acid in the mass ratio of (1.5-2.2):(1.5-2.5):(7.5-8.5). The reinforcing agent is sodium bentonite. The profile control agent has the advantages that the water swelling rate is high, and thus the requirement for effective plugging of large water channeling pore passages can be met; 2, the water swelling speed is low, and thus the requirement for stratum deep injection can be met; 3, the profile control agent has high strength and flexibility after water swelling; 4, the profile control agent is good in temperature resistance and salt resistance, and capable of effectively plugging channeling passages in polymer flooding-to-water flooding oil deposits, improving water injection profiles, making subsequently-injected water turn in the deep, increasing the swept volume and improving the subsequent water flooding efficiency.
Owner:CHINA PETROLEUM & CHEM CORP +1

Slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.
Owner:PETROCHINA CO LTD

Film mulching and ridging salt-tolerance planting method for sweet sorghum in coastal beach saline-alkali soil

InactiveCN103518519ADetermination of suitable sowing dateSuitable for sowingHorticultureAlkali soilSoil science
The invention discloses a film mulching and ridging salt-tolerance planting method for sweet sorghum in coastal beach saline-alkali soil, and belongs to the technical field of crop growing. According to the method, base fertilizer is sufficiently applied in the saline-alkali soil in a coastal beach area, wherein the salt content of the saline-alkali soil is lower than 0.5%; after the soil is finely prepared, ditching is carried out to make beds according to the standard that the width of each bed face is 3-4m; the sweet sorghum is planted in large lines and small lines in suitable density according to the salt content of the soil, wherein the large line spacing is 80cm, and the small line spacing is 40cm; sweet sorghum species of which the growth period ranges from 110 days to 120 days are selected and used to be seeded in the last ten-day period of May and the first ten-day period of June; if soil moisture content is low, irrigation can be carried out to improve the soil moisture content, and seeding is carried out after the soil moisture content reaches a suitable value; after seeding and earthing, the small lines are covered by mulching film, small high ridges with the height of about 5cm and the width of about 10cm are heaped at the film edges, and seedlings are led out of the film timely after emerging. The high-yield culture techniques such as final singling and seedling keeping management, base fertilizer application, jointing fertilizer dressing and disease pest and weed integrated control are adopted after seedling emerging for field management, and the high yield of the sweet sorghum with the stem and leave fresh weight reaching 4-5ton per mu can be achieved.
Owner:JIANGSU ACADEMY OF AGRICULTURAL SCIENCES

Method for preparing high-expansion nano silica composite microspheres

The invention relates to the field of nano silica processing treatment and in particular relates to a method for preparing high-expansion nano silica composite microspheres. The method for preparing high-expansion nano silica composite microspheres comprises the following steps: performing surface grafting modification on SiO2 nanoparticles by using a surface modifier; adding the modified SiO2 nanoparticles into an organic solvent, simultaneously adding a dispersing agent, monomer acrylamide, acrylic acid, a cross-linking agent and an initiator, and ultrasonically and uniformly dispersing; introducing nitrogen into the dispersed solution for bubbling to remove oxygen; carrying out a polymerization reaction after oxygen removal; and repeatedly washing by using ethanol, thereby obtaining the composite microspheres. The microspheres disclosed by the invention have high structural stability, even if the solution temperature is close to the boiling point, the microspheres do not split, and the expansion properties are improved; and moreover, the initial size of the microspheres is less than 1 micron, the microspheres can be applied to plugging of tiny cracks, the final expansion ability can be over 10 times, and the microspheres have good salt tolerance, wide application range and reliable plugging capacity.
Owner:浙江冠旗纳米科技有限公司

Process and equipment for treating high-concentration pyridine waste water

The invention relates to a process for treating high-concentration pyridine waste water, which comprises the following steps of: regulating raw water of waste water to be acidic, and treating the raw water in electro-catalytic oxidation equipment; leading effluent to a micro-electrolysis device for treatment under the condition of maintaining the acidity and oxygen enrichment of the waste water; regulating the effluent to be meta-alkalescent, and adding chemicals to perform coagulating sedimentation; and controlling the salinity of the waste water to be below 2 percent, and performing biochemical treatment in an anaerobic hydrolyzing device and a pressurizing biological contact oxidation device, so that the effluent reaches the conventional first-level standards for sewage discharge. Due to the adoption of a physico-chemical treatment process serving electro-catalytic oxidation as a core, pyridine pollutants can be decomposed effectively, the toxicity of the waste water can be reduced, and the biodegradability of the waste water can be improved; for biochemical treatment is realized by a combination process of anaerobic hydrolysis and pressurizing biological contact oxidation, the organic loads, treatment efficiency and salt-tolerant capacity of the biochemical treatment are improved; and the process has the characteristics of high impact load resistant capacity, good treatment effect and low operating cost, and the treated high-concentration pyridine waste water can reach the standard stably before discharge.
Owner:JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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