62 results about "Salt resistance" patented technology

The invention relates to a temperature-resistant and salt-resistant gel for deep plugging and a preparation method thereof. The gel comprises a main agent, a cross-linking agent, a cross-linking promoting agent, a reinforcing agent, a stabilizing agent and water. The main agent is an acrylamide / 2-acrylamide-2-methylpropanesulfonic acid / N-vinyl pyrrolidone (AM / AMPS / NVP) terpolymer, the temperature-resistant and salt-resistant gel for deep plugging control is suitable for oil reservoirs with the temperature of 110-130 DEG C and the formation water mineralization degree of 5 * 10 < 5 >-10 * 10 < 5 > mg / L, the gelling time is controllable within 73-98 hours, the gel strength after gelling is high, the thermal stability is good, and the temperature-resistant and salt-resistant gel for deep plugging control is suitable for the oil reservoirs with the temperature of 110-130 DEG C and the formation water mineralization degree of 5 * 10 < 5 >-10 * 10 < 5 > mg / L. And long-time deep effective plugging of high-temperature and high-salt oil reservoirs can be realized.

The invention discloses a salt-resistant foam scrubbing agent for oilfield exploitation and a preparation method thereof, and belongs to the technical field of foam scrubbing agent preparation. The salt-resistant foam scrubbing agent for oilfield exploitation is prepared from the following components in parts by weight: 15 to 25 parts of a main surfactant, 5 to 10 parts of cocamidopropyl betaine, 0.1 to 0.6 part of a cosurfactant, 1 to 4 parts of EDTA (Ethylene Diamine Tetraacetic Acid) disodium, 0.05 to 0.12 part of nano silicon dioxide and 3 to 6 parts of isopropanol. The foam scrubbing agent prepared by the invention has excellent salt resistance and stability.

The application provides a temperature-resistant and salt-resistant wall stabilizer for a ten-thousand-meter deep well water-based drilling fluid and a preparation method and application thereof, and belongs to the technical field of drilling. The preparation method of the wall stabilizer comprises the following steps: acrylic acid is added into deionized water, the pH of the system is adjusted to 7.0, then N-hydroxymethyl acrylamide, N-[2-(3,4-dihydroxyphenyl)ethyl]-2-acrylamide, an emulsifier, octadecyl vinyl ether and a complexing agent are sequentially added into the system, shearing is performed, a monomer solution is obtained, an initiator is added into the monomer solution, and reaction is performed; after the reaction is completed, washing, drying and crushing are performed, and the wall stabilizer is obtained. The wall stabilizer has a temperature resistance of 200 DEG C and a salt resistance of saturation, has strong adsorption and high cohesion, can effectively adsorb, plug and cement micro-pores and micro-cracks of rocks, thereby consolidating the rocks, effectively enhancing the well wall stability, preventing drilling fluid leakage and providing technical support for safe and efficient drilling of deep wells.

The invention discloses an application of caffeic acid-O-methyltransferase in regulation and control of salt tolerance of rice. The overexpressed OsCOMT gene disclosed by the invention can remarkably improve the melatonin content and antioxidant level of rice seedlings, so that the tolerance of plants to salt stress is enhanced, and the plants can maintain normal growth under the condition of salt stress; the deletion of the gene OsCOMT leads to the increase of the sensitivity of seedling-stage rice to salt stress, and exogenous melatonin can recover the salt-sensitive phenotype of a mutant-knocked-out plant and improve the photosynthetic rate of the mutant-knocked-out plant. The OsCOMT gene and the encoding protein thereof have important theoretical and practical significance on research of a plant stress tolerance mechanism and improvement of stress tolerance and related traits of plants, can play an important role in plant stress tolerance gene engineering improvement, and are wide in application prospect.

The invention provides a wall-fixing leakproof water-based drilling fluid for a myriameter deep well as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The water-based drilling fluid is prepared from the following raw materials in parts by mass: 100 parts of water, 1-2 parts of sodium bentonite, 0.5-1 part of a salt response rheological modifier, 5-6 parts of a supramolecular polymer filtrate reducer, 6-8 parts of a cementing plugging agent and 2-4 parts of a cementing wall-fixing agent. The water-based drilling fluid can resist the temperature of 220 DEG C, can resist the salt to be saturated, has good rheology and filtration performance and multiple functions of inhibition, plugging, wall fixation and the like under high-temperature and high-salt conditions, and provides technical guarantee for smooth drilling of myriameter extra-deep wells.

The present invention relates to a soluble bridge plug that prevents shedding, belonging to the technical field of soluble bridge plugs. The main body mechanism of the present invention is provided with an inner and an outer layer. The central tube has an ordinary dissolution rate and does not affect the conduction of the casing after subsequent dissolution. Moreover, the outer tube and the components installed thereon are all subjected to laser shock strengthening, having high temperature and high salt resistance performance, so that it will not dissolve prematurely within the predetermined construction time. Since the bridge plug adopts a double-layer structure, the outer layer is difficult to be dissolved and damaged, avoiding the situation that the device falls off the casing before the predetermined construction time and enhancing the stability of the device. When the predetermined plugging time is not reached, after the dissolution liquid enters the central tube through the gap between the ball and the ball seat to generate a gap, the metal seal in the sealing mechanism will adaptively deform under a certain pressure to seal the gap, avoiding the situation that more dissolution liquid enters the outside of the central tube through the gap to dissolve the two sides of the central tube simultaneously.

This utility model belongs to the field of oil and gas extraction technology, and discloses a measuring device and a rotational rheometer for detecting the salt resistance of crosslinking agents. The measuring device for detecting the salt resistance of crosslinking agents includes a housing, a cover, a rotating assembly, and a liquid injection assembly. The housing is fitted into a supporting groove and has a communicating receiving chamber and a liquid injection channel, the liquid injection channel being located on the side wall of the housing. The cover is detachably fastened to the housing and has a through hole. The rotating assembly is located in the receiving chamber, and one end is rotatably mounted vertically in the through hole. The rotating assembly is connected to the output end of the rotational drive mechanism of the rotational rheometer. The liquid injection assembly includes a storage container, a liquid injection pipeline, and a liquid injection mechanism. One end of the liquid injection pipeline is connected to the storage container, and the other end is connected to the liquid injection channel. The storage container is used to store brine, and the liquid injection mechanism is located on the liquid injection pipeline. Using this measuring device to detect fracturing fluids can reduce the workload of workers and improve work efficiency.

The invention provides a thickening agent for self-crosslinking slick water, a preparation method of the thickening agent and fracturing fluid, and belongs to the technical field of oil exploitation. Comprising a temperature-resistant, shear-resistant and salt-resistant polymer, a synergist, a salt-resistant component, a structure regulator, a suspending agent and an emulsifier. The prepared thickening agent for the self-crosslinking slick water is good in temperature resistance, salt resistance and shearing resistance, has good tackifying and dissolving performance and good sand carrying and thickening effects, is low in damage rate to a rock core after gel breaking, can be widely applied to fracturing transformation of low-permeability and ultra-low-permeability reservoirs, and has a good application prospect. The prepared fracturing fluid integrates the functions of drag reduction, sand carrying, fracture forming, swelling prevention, discharge aiding, low damage and the like, and has a wide application prospect.

The present disclosure relates, according to some embodiments, to systems, apparatus, compositions, methods, and workflows that include salt active nucleases (e.g., salt active nuclease variants) with desirable properties including, for example, salt tolerance.

The invention relates to application of P (NVP-co-MAA) in preparation of a pH and temperature dual-regulated switch type emulsion, and belongs to the technical field of emulsion preparation. According to the invention, P (NVP-co-MAA) is mixed with oil and water to obtain the emulsion, and the emulsion is found to be sensitive to pH and temperature, so that the emulsion can be used as a pH and temperature dual-regulated switch type emulsion. In addition, the switch type emulsion provided by the invention has good stability, still keeps an emulsified state under the NaCl concentration of 0.1 mol / L, and has good salt tolerance; when the pH is 5-6, the emulsion state can be maintained for at least 21 days, and the long-term stability is realized; and at least 15 times of emulsification-demulsification circulation can be carried out, and the circulation stability is good. The invention provides a new thought for the preparation of the switch type emulsion, and has a wide application prospect.

The invention relates to the technical field of agricultural transgenosis, and particularly discloses application of a GhDBB28 gene in regulating and controlling salt tolerance of upland cotton plants, and the nucleotide sequence of the GhDBB28 gene is as shown in SEQ ID NO.1; the sensitivity of upland cotton plants to salt is improved by silencing the GhDBB28 gene. The activity of an anti-oxidation system in the upland cotton plant is reduced through silencing of GhDBB28, so that the plant is more sensitive to salt stress, and a scientific basis is provided for constructing a new plant type of a salt-sensitive transgenic upland cotton plant.

The invention relates to the technical field of oil field oil extraction, and discloses a salt-sensitive viscoelastic gel modifying and flooding agent and a preparation method thereof.The modifying and flooding agent is formed by mixing a viscoelastic amphoteric polymer serving as a base material and phenolic resin and a regulator serving as auxiliary materials, and the modifying and flooding agent is prepared by preparing an amphiphilic cross-linking agent containing sulfonic acid anions and quaternary ammonium cations in the structure at the same time. Firstly, the cross-linking polymerization can enable the molecular chain of the prepared polyacrylamide to present a cross-linked structure, so that the polyacrylamide has a gel characteristic, the high viscoelasticity of the profile control and flooding agent is realized, and a good profile control and flooding effect is achieved. Secondly, due to the existence of sulfonic acid anions, the oil-water interfacial tension can be effectively reduced, the sensitivity of the modifying and flooding agent to salt can be improved, the salt resistance of the modifying and flooding agent can be enhanced, quaternary ammonium cations carry positive charges, acylamino on a polyacrylamide molecular chain can form hydrogen bonds with particles, and the quaternary ammonium cations and the polyacrylamide can cooperate with each other to form a'multipoint adsorption-bridging 'structure; and the plugging efficiency is obviously improved.

The invention discloses a drag reducer for brine-resistant well cementation. The drag reducer comprises 45-60 parts by weight of a polycarboxylic acid polymer, 35-45 parts by weight of an aliphatic polymer and 5-10 parts by weight of a naphthalene sulfonic acid dispersant. The brine-resistant well cementation drag reducer provided by the invention is formed by mixing a plurality of polycarboxylic acid drag reducers, aliphatic drag reducers and naphthalene drag reducers which have dispersion effects, has the advantage of good dispersion at both high temperature and low temperature, and has a good salt-resistant effect; compared with the conventional drag reducer, the drag reducer provided by the invention has the advantages that the addition amount is greatly reduced, the efficiency is high, and the dispersing performance of a system is excellent; meanwhile, the rheological property is good, and the characteristic of sodium chloride brine resistance is also achieved; the drag reducer provided by the invention has broad spectrum performance and can be applied to conventional cement slurry, salt-containing cement slurry and high-density cement slurry systems.

The invention discloses a salt-tolerant clean fracturing fluid and a preparation method thereof, and the salt-tolerant clean fracturing fluid comprises the following components: an anionic-nonionic surfactant NPEC and a cationic surfactant CTAB, the preparation method comprises the following steps: step a, uniformly mixing an anionic-nonionic surfactant NPEC and a cationic surfactant CTAB according to a ratio; step b, adding water, stirring until the materials are completely dissolved, adjusting the pH value, and performing cooling and aging treatment; and c, adjusting the viscosity and rheological property of the fracturing fluid according to actual requirements by adding NaCl with different concentrations. The fracturing fluid prepared by the invention can effectively cope with the influence of hypersalinity formation water in shallow oil and gas reservoirs; the stability of the fracturing fluid is improved, and performance reduction caused by salting-out is reduced; the method has high salt tolerance, is suitable for development of shallow oil and gas reservoirs, does not need high-temperature crosslinking, and has good economical efficiency and practicability.

The present application relates to a kind of double-core paper diaper water-absorbing material and its preparation method, belong to baby paper diaper field, the double-core paper diaper water-absorbing material includes acrylic acid 55-67 parts, salt-resistant anti-bonding auxiliary agent 10-14 parts, ammonium persulfate 1.4-1.7 parts, sodium sulfite 0.7-1.0 parts, glycerol 1-2.5 parts, aluminium sulfate 0.5-0.9 parts and ethanol 16-26 parts according to weight parts.The water-absorbing material is composed of water-absorbing core and coating layer.Amide group in water-absorbing core water-absorbing capacity is less affected by salt solution, after water absorption, water-absorbing core internal macromolecular network ionizes into ion pair, due to the difference between internal and external ion concentration produces greater osmotic pressure, can effectively improve the salt resistance and water-absorbing speed of water-absorbing material;The formation of coating layer further improves the salt resistance of water-absorbing material, and the gel strength of this coating layer is larger after water absorption, to avoid bonding agglomeration.

The application discloses a salt-resistant water-non-dispersible material for oil well cement and a preparation method thereof. The salt-resistant water-non-dispersible material for oil well cement comprises the following components in the form of weight parts: 100 parts of N,N-dimethyl acrylamide, 3-6 parts of acrylic acid, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of a cyclic monomer, 0.1-0.4 parts of a branching agent, 5-15 parts of a cationic monomer, 0.3-3 parts of a crosslinking agent and 400-500 parts of water. The salt-resistant water-non-dispersible material prepared by the application has good salt resistance, can significantly improve the anti-dispersion performance of the cement slurry when used in a salt water and sea water cement slurry system with a NaCl content of 18 wt% or less, and has excellent rheological performance.

The invention discloses a high-temperature-resistant and high-salt-resistant hydrophobic association type fracturing fluid thickening agent as well as a preparation method and application thereof. According to the invention, a terpolymer (AM / AMPS / DNS-86) is synthesized through free radical polymerization of an aqueous solution, the intrinsic viscosity of the terpolymer reaches 16.8799 dL / g, and the molecular weight of the terpolymer is about 1.13 * 10 < 7 > g / mol. The thickening agent has good dissolving performance and temperature and salt resistance, the viscosity of polymer fracturing fluids with different concentrations can meet the industrial requirements after the polymer fracturing fluids are sheared for 1 h under the conditions of 170 s <-1 > and 100 / 80 / 60 DEG C, the gel breaking time at 80 DEG C is shorter than 60 min, the thickening agent is suitable for fracturing of high-temperature and high-salt oil reservoirs, and the cost is reduced compared with a traditional system.

[Problem] To provide a composition having excellent dispersion stability of silica particles under high temperature and / or high salt concentration conditions and having excellent salt resistance. [Solution] This composition comprises surface-modified silica particles, a surfactant, and a solvent, wherein, when the composition is diluted to a silica concentration of 2 mass% with a 5 mM sodium tetraborate aqueous solution to prepare a test solution, and affinity capillary electrophoresis is conducted under conditions of a capillary temperature of 25°C, a capillary applied voltage of 30 kV, a capillary inner diameter of 75 μm, a total capillary length of 112.5 cm, and an effective capillary length of 104 cm, using the surface-modified silica particles as a ligand and a surfactant containing an anionic surfactant, a nonionic surfactant, or a mixture of two or more thereof as an analyte, the composition has an electrophoretic mobility of -0.017 to -0.0010 cm2 / V·min.

The invention belongs to the technical field of plant breeding, and particularly relates to application of a GhPEP72 gene in regulation and control of plant salt tolerance. The nucleotide sequence of the GhPEP72 gene provided by the invention is as shown in SEQ ID NO. 1, and the amino acid sequence of the protein expressed by the GhPEP72 gene is as shown in SEQ ID NO. 2. A research result proves that the growth inhibition of a GhPEP72 gene silencing plant under salt stress treatment is more obvious, the salt damage characteristic is more obvious, sodium ion accumulation in roots, stems and leaves is increased, the potassium ion content is reduced, the ratio of sodium ions to potassium ions in the leaves is increased, and the GhPEP72 gene silencing plant is more sensitive to salt stress; compared with wild arabidopsis thaliana under salt stress treatment, the overground part of a GhPEP72 gene overexpression transgenic homozygous plant grows more vigorously, the number of lateral roots of the underground part is larger, the lateral roots are longer, and the GhPEP72 gene has good stress resistance, so that the GhPEP72 gene plays a positive regulation role in regulating plant salt stress.

The present application relates to a kind of anti-salt thickening agent and its preparation method and application, belong to the technical field of oil fracturing fluid processing.Solve the technical problems of low economic benefit, high cost and big environmental protection pressure in prior art that fracturing flowback fluid must be treated before being reused, such as metal ions, solid impurities and the like.The anti-salt thickening agent of the present application, by weight, raw materials include acrylamide 53-60 parts, acrylic acid 45-55 parts, 2-acrylamide-2-methylpropane sulfonic acid 1.5-2 parts, styrene 0.1-1 part and modified polyethylene glycol 3-6 parts.The anti-salt thickening agent, the introduced sulfonic acid group, benzene ring and tannic acid, have excellent salt resistance and stability, can resist fracturing flowback fluid with total salinity ≤1wppm, calcium and magnesium ion concentration ≤500ppm, and fracturing flowback fluid with iron ion concentration within 50ppm, providing a basis for direct use of fracturing flowback fluid.

The invention relates to instant polyacrylamide and a preparation method thereof, and relates to the technical field of polyacrylamide preparation. The instant polyacrylamide is prepared from the following raw materials in parts by mass: 10 to 20 parts of acrylic acid, 60 to 70 parts of acrylamide, 50 to 60 parts of dimethyl diallyl ammonium chloride, 40 to 46 parts of a temperature-resistant and salt-resistant agent, 0.05 to 0.15 part of an initiator and 220 to 240 parts of deionized water, wherein the temperature-resistant and salt-resistant agent comprises 2-acrylamido octyl sulfonic acid; the method has the effect of improving the temperature resistance and salt resistance of polyacrylamide.

The present invention discloses a salt-responsive high-temperature resistant drilling fluid thickener, a preparation method thereof, and an application thereof. The salt-responsive high-temperature resistant drilling fluid thickener comprises a first side chain, a second side chain, a third side chain, and a fourth side chain, the number ratio of the four being (5-9): (3-5): (1-2): (0.2-0.4); the weight average molecular weight of the salt-responsive high-temperature resistant drilling fluid thickener is 1.0×10 7 ~3×10 7 The thickener can resist salt until it is saturated with salt at 180℃, and still has good salt resistance and thickening effect at 200℃.

The application discloses a salt-tolerant related gene ZOS1-18 of rice, and a coding protein and application thereof. The gene ZOS1-18 is a DNA molecule as described in 1) or 2) or 3) below: 1) a DNA molecule with a genomic sequence as shown in SEQ ID NO. 1; 2) a DNA molecule with a CDS sequence as shown in SEQ ID NO. 2; and 3) a DNA molecule hybridized with the DNA sequence defined in 1) or 2) under stringent conditions and encoding the protein. The application provides a genetic engineering application of the gene ZOS1-18 in regulating the salt tolerance of rice, specifically, knocking out the aforementioned gene ZOS1-18 to improve the salt sensitivity of rice, and overexpressing the aforementioned gene ZOS1-18 to improve the salt tolerance of rice.

[Problem] There is provided an inorganic oxide particle-containing composition exhibiting excellent dispersion stability of inorganic oxide particles and excellent salt tolerance. [Solution] An inorganic oxide particle-containing composition, wherein, in image analysis of a frozen sample by cryo-transmission electron microscope observation, the sample being prepared by adding the inorganic oxide particle-containing composition to 4% by mass of salt water such that the concentration of inorganic oxide particles is 0.5% by mass, and rapidly freezing with liquefied ethane, a coefficient of variation, which is a value obtained by dividing a standard deviation of areas of Voronoi partition regions based on an inorganic oxide particle distribution in a region of interest (ROI) by the arithmetic mean of the areas, is 0.1 to 0.7.

The invention discloses a red sandstone cultural relic anti-weathering coating and a preparation method thereof, and relates to the field of red sandstone cultural relic anti-weathering coatings, the coating comprises the following components by weight: 85-110 parts of absolute ethyl alcohol, 10-15 parts of a film forming component, 0.5-1.5 parts of a salt crystallization inhibitor, 0.5-2 parts of a pore forming agent, and 0.01-0.06 part of a composite nano modifier; and the film forming component comprises dodecyl trimethoxy silane. After the coating is used for the red sandstone cultural relics, the original color and appearance of the red sandstone cultural relics cannot be covered, and the reinforced and repaired red sandstone cultural relics also have the properties of high surface hardness, high hydrophobicity, high air permeability, excellent acid resistance, excellent salt resistance and the like.

This invention relates to the field of rice genetic engineering, specifically providing the application of the OsMT9 protein and its encoding gene in regulating rice salt tolerance. This invention designs a specific targeting... OsMT9 The sgRNA in the coding region of the gene (target sequences shown in SEQ ID NO.4 and SEQ ID NO.5) was extracted, and a gene editing vector was constructed. The gene was then transformed into rice Zhonghua 11 using Agrobacterium-mediated transformation, yielding... OsMT9 Mutants with loss of gene function, such as mutants 22-1 and 23-15. Salt stress experiments showed that the survival rate of these mutants (approximately 43%) was significantly higher than that of the wild type (approximately 6%). This invention provides new gene targets and valuable germplasm resources for salt-tolerant rice breeding, and is of great significance for the utilization of saline-alkali land.

This invention relates to the field of flow analyzer technology, and particularly to a method for identifying the salt tolerance of wheat based on an AA3 type flow analyzer. The method includes: Step S1, obtaining a number of wheat samples to be tested; Step S2, preparing sodium ion and potassium ion standard working solutions respectively; Step S3, injecting each standard working solution into a continuous flow analyzer and measuring the sodium and potassium ion standard working curves using a flame photometer; Step S4, constructing the detection parameters for the samples to be tested; Step S5, injecting the samples into a continuous flow analyzer and measuring the absorbance of each standard stock solution using a flame photometer; Step S6, analyzing the salt tolerance of wheat based on the measured sodium and potassium ion concentrations of the samples to be tested. This invention has advantages such as continuous testing of batches of samples, fast analysis speed, saving manpower and resources, high accuracy, and strong anti-interference ability.

The application relates to the field of agricultural transgenic technology, and particularly discloses GhDBB28 application of a gene in regulating salt tolerance of upland cotton plants, the gene GhDBB28 The nucleotide sequence of the gene is shown as SEQ ID NO. 1; silencing the gene GhDBB28 increases the salt sensitivity of the upland cotton plants. The application reduces the activity of an antioxidant system in the upland cotton plants by silencing the gene GhDBB28 , so that the plants are more sensitive to salt stress, and a scientific basis is provided for constructing a transgenic upland cotton plant with new salt-sensitivity.

The invention provides a plugging agent composition and application thereof. The plugging agent composition comprises modified lignin, a resin emulsion, a filler, a stabilizer, a cross-linking agent and water, the curing time of the plugging agent composition is adjustable, and an elastomer formed after curing is high in deformation capacity, has enough compression stress, is good in high-temperature and high-salt resistance and can better adapt to changes of holes and pores in a high-temperature and high-salt environment; and the water plugging agent is low in cost, simple in preparation process, simple to operate during field use, good in field adaptability and suitable for water plugging operation of high-temperature and high-salt carbonate fractured-vuggy reservoirs.

The invention relates to the technical field of soil remediation, in particular to salt resistance and alkali reduction equipment suitable for saline-alkali soil, comprising a mounting rack and a feeding assembly mounted on the mounting rack; the device further comprises a power assembly. The mounting frame is connected with a power assembly; the power assembly is connected with a soil dividing plate, and the soil dividing plate is hollow; the soil separating plate is connected with a conveying assembly for continuously conveying materials of the salt isolating layer; a guide plate is arranged on each of the two sides of the soil dividing plate; the lower part of the soil dividing plate is fixedly connected with a mounting cylinder; and two outer arc plates which are symmetrically distributed are rotationally connected in the mounting cylinder. The two outer arc plates are pushed by the two connecting rods to be unfolded towards the opposite sides by taking the mounting cylinder as the center, a combined shape is changed into an acute angle shape, powdery soil on the outer sides of the two outer arc plates is pushed away towards the two sides, and meanwhile, the two outer arc plates drive the corresponding fan-shaped elastic pieces to move out of the fan-shaped grooves, so that the powdery soil can be removed. The unfolded outer arc plates and the fan-shaped elastic pieces are separated to form a space for laying corn straw on the lower portion of the plough layer.