73results about How to "Good anti-expansion effect" patented technology

The invention relates to a low-friction recyclable slickwater fracturing fluid system suitable for compact oil and gas reservoirs and a preparation method thereof. Every tonnage of water is added with 0.06-0.25% of a water soluble drag reducer by mass, 0.2-0.5% of a demulsification cleanup additive by mass and 0.5% of a clay stabilizer by mass for evenly mixing to obtain a slickwater fracturing fluid; the prepared slickwater fracturing fluid is a reverse phase micro-emulsion system, and has the characteristics such as low viscosity, thorough gum breaking, easy flowing back, good expansion prevention performance and low friction; the resistance reducing effect is obvious; compared with clear water, the resistance reducing effect can achieve 50-70%; in the scene hydraulic fracturing operation, the resistance reducing rate of the water soluble drag reducer is 42.5% higher than that of the traditional guanidine gum slickwater in the case that the construction displacement is 3.5 m<3> / min.

The invention offers high density fracturing fluid formula used inorganic salt to improve water-base fracturing fluid density. Its feature is that its weight ratio is as follows: weight additive 4-50%, vegetable gum thickener 0.3-1.0%, cross linking agent 0.1-2.0%, pH value regulator 0.5-1.0%, cracking agent 0.002-0.3%, cleanup additive 0.05-0.5%, fungicide 0.03-0.2%, and water 30-73%. The density of the high density fracturing fluid is adjustable and can exceed 1.51g / cm3. It has good high temperature resistant, shearing resistant, and so on. Thus it can supply reliable assurance for abnormal high pressure and ultra-deep well exploration test oil and exploitation.

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.

The invention relates to acidic water repellent associated matter fracturing fluid. The fracturing fluid consists of crosslinked fluid and original fluid, wherein the crosslinked fluid comprise the following components in percentage by weight: 0.2 to 0.5 percent of acidic crosslinked agent, 0.01 to 0.035 percent of crosslinked regulator A, 0.02 to 0.3 percent of crosslinked regulator B, 0.02 to 0.2 percent of gelbreaker and the balance of water; and the original fluid comprises the following components in percentage by weight: 0.3 to 0.7 percent of FS-927 polymer, 1 to 4 percent of potassium chloride, 0.5 to 1.5 percent of MJ-1 high-temperature discharge aiding agent, 0 to 2.5 percent of JTY-100 fluid loss agent, 1 percent of PR-1 demulsifier, 0 to 0.02 percent of temperature stabilizer and the balance of water. The fracturing fluid has the advantages of high crosslinking delaying performance, temperature resistance, salt resistance and shearing resistance, high sand carrying capacity, small damages to stratum, low friction resistance, low residue amount and good expansion preventing effect, can easily break gel and flow back, and breaks through the traditional concept that retarded crosslinking polymer fracturing fluid has temperature resistance and sheering resistance which can be realized at the temperature of not more than 100 DEG C.

The invention relates to the technical field of the fracturing of an oil field, and particular relates to an acid carboxymethyl guargum fracturing fluid and a preparation method of the fluid. The acid carboxymethyl guargum fracturing fluid comprises the following raw materials: carboxymethyl guargum power, discharge aiding agent, swelling-resistant agent, bactericide, demulsifier, acid cross-linking agent, cross-linking time delay action activator, gel breaker and water. The preparation method of the fluid comprises the following steps of: firstly preparing base liquid; secondly preparing cross-linking; and thirdly preparing the acid carboxymethyl guargum fracturing fluid. The invention has the beneficial effects of acidic crosslinking environment, simple technology, convenience of in-field operation, and good combination property; and the acid carboxymethyl guargum fracturing fluid has the advantages of being good in compatibility performance, delayed in crosslinking characteristic, good in fluid loss characteristic, good in swelling-resistant effect, low in residue, and thorough in gel breaking, and can meet the fracturing construction of a reservoir stratum under the temperature from 30 DEG C to 100 DEG C.

The invention discloses a clay stabilizing agent suitable for low-permeability oil pool, which comprises the following materials in percentage by weight: 0.8-98% of (2-hydroxyethyl)trimethylammonium chloride, 0-20% of inorganic salt containing ammonium or potassium ions, and the balance of tap water or oil field return water. The clay stabilizing agent effectively prevents the clay from swelling, can achieve the anti-swelling rate more than 90 percent, has good compatibility with HPAM-containing oil field return water without generating floccules and low damage rate of an oil field and is suitable for the low-permeability oil pool developed by infusing the HPAM-containing oil field return water.

The invention discloses a compound acid blockage removing fluid. The blockage removing fluid is prepared from raw materials in parts by weight as follows: 4-6 parts of a foam flushing fluid, 20-30 parts of a prepad fluid, 70-100 parts of main acid and 10-20 parts of postpad fluid. The acid fluid has higher capacity of removing organic sediment pollution and high acid residue and emulsifying resistance. The acid fluid has low corrosion speed and good swelling inhibition and does not change the original water wetting characteristic of the stratum.

The present invention relates to a preparation method of a clay stabilizer for low permeability stratum. The preparation method sequentially comprises: adding epichlorohydrin to the aqueous solution of a monoaliphatic amine, carrying out a reaction for a certain time, adding epichlorohydrin, heating, carrying out a reaction, adding polyamine, adding epichlorohydrin, carrying out a reaction, and drying to obtain the clay stabilizer.

An emphasized acid liquor formula consists of 31% industrial hydrochloric acid 60-125 proportion, inorganic salt saturated solution 30-65 proportion, acid liquor gelatinizer 0.6-1.6 proportion, acid liquor corrosion inhibitor 3-5 proportion, demulsifier 1-2 proportion, ferrous ion stabilizer 1-2 proportion, and auxiliary 1-2 proportion; the emphasized fracturing liquid density is between 1.25-1.55g / cm3. It can be used to decrease construction pressure at well opening, finish oil-well fracture of deep well, super-deep well, abnormal high-pressure well and realize storage-layer transformation.

The invention relates to a high-density fracturing fluid capable of slowing crosslinking and resisting high temperature. The fracturing fluid is composed of a stock solution and a crosslinking liquid with a volume ratio of 10 : 1, wherein the stock solution comprises, by weight percent, 0.5-0.65 % of hydroxypropyl guar gum, 8-45 % of a weighting agent A, 6-30 % of a weighting agent B, 0.5-2 % of a ZJ-07 cleanup additive, 0.01-0.04 % of a pH-value conditioning agent A, and the balance being water; the crosslinking liquid comprises, by weight percent, 0.5-3 % of a cross-linking agent YGB, 1-2 % of a cross-linking agent HT, 0.1-0.4 % of a pH-value conditioning agent B, 0-0.35 % of a gel breaker and the balance being water. The fracturing fluid is good in temperature-resistance and shearing-resistance performances, wherein the temperature-resistance performance is up to 145 DEG C, and a viscosity is still more than 120 Pa*S after the liquid is sheared for 90 minutes under 145 DEG C and 170 S<-1>.

The invention discloses an underground coal mine hydraulic sand fracturing system and method. The underground coal mine hydraulic sand fracturing system comprises a water supply system, a fluid distribution system, a sand mixing system, a fracturing system and a high-pressure manifold system; the fracturing system is formed by two fracturing pump groups in parallel; the high-pressure manifold system comprises a Y-shaped tee, and two inlet channels of the Y-shaped tee separately communicate with outlets of the two fracturing pump groups; and the fluid distribution system comprises two fluid distribution pools. The fracturing method is implemented based on the fracturing system and comprises the steps that fracturing liquid is prepared by densifiers, crosslinking agents, anti-swelling agents, gel breakers and water according to proportion; the particle size of a supporting agent is 40-70 meshes, and the volume density of ceramsite sand is 1.25g / cm<3>; and fracturing is carried out according to the sequence of first hydraulic fracturing seam generating and later fracturing liquid sand-carrying fracturing support. The underground coal mine hydraulic sand fracturing system has the beneficial effects that the fracturing system is simple in structure and reasonable in layout, and is suitable for sand-carrying fracturing use of underground narrow and small or long and narrow space; andthe fracturing liquid prepared by the fracturing method has suspended sand characteristic, can be suitable for upward drilling sand-carrying fracturing, and has the environmental protection characteristic of being capable of directly discharged.

The present invention relates to a gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid, which comprises, by mass, 0.5-0.65% of hydroxypropyl guar gum, 1-15% of KCl, 0.1-2% of OP-10, 0.5-3% of WT-1, 1% of a cleanup additive, 0.5-2% of an emulsion breaker, 0.5-2% of a clay stabilizer, 0.01-0.1% of a bactericidal agent, 0.01-0.03% of sodium hydroxide, 5-40% of diesel fuel, and the balance of water. With the gel breaking and emulsion breaking oil-in-water emulsification fracturing fluid, a use effect of the fracturing fluid can be substantially increased, such that the fracturing fluid can be subjected to complete gel breaking, and emulsion breaking can be performed under the stratum condition.

The invention discloses a clay anti-swelling agent mainly including the following three substances: ammonium salt, polyols and potassium formate, wherein the mass percentage of the ammonium salt is 20-60.0%, the mass percentage of the polyols is 2.0-30.0% and the mass percentage of the potassium formate is 2.0-10%, and the balanced being water. The clay anti-swelling agent is excellent in temperature resistance, is excellent in anti-swelling property and is suitable for low-permeability reservoirs.

The invention provides a weighted fracturing fluid. The weighted fracturing fluid is a liquid system prepared by using the following raw materials, by weight, 29-70.5 parts of a weighting agent, 0.2-0.8 parts of a vegetable glue thickener, 0.1-0.8 parts of a cleanup additive, 0.02-0.15 parts of a bactericide, 0.05-0.3 parts of a pH value adjusting agent, 0.1-0.7 parts of a cross-linking agent, 0.03-0.2 parts of a gel breaker and 29.5-71 parts of water. The density of the fracturing fluid at room temperature is 1.22-1.62g / cm<3> or more; the temperature resistance capability of the fracturing fluid can reach above 200DEG C; and the fracturing fluid has the characteristics of cross-linking delaying, low frictional resistance, good cross-linking performance, strong temperature and shear resistance, low filter loss, thorough gel breaking, low residue content, good expansion resistance and the like.

The invention relates to the technical field of oil and gas field down-hole operation, and specifically relates to a low-pressure sandstone reservoir gas well temporary blocking workover fluid and a preparation method thereof. The workover fluid is composed of the following components, according to percentages in the wellbore volume: 10-20% of an alcohol-based temporary blocking workover fluid, 0.5-1% of an oil-based spacer fluid, and 79-89.5% of a high-efficiency clay stabilizing agent. The alcohol-based temporary blocking workover fluid is composed of the materials of, by mass, 0.5-1% of a water-absorbent polymer, 1-2% of temporary blocking fiber, 0.5-1% of a fiber dispersing agent, 45-50% of water, and balance of alcohol. The high-efficiency clay stabilizing agent is composed of the materials of, by mass, 0.6-1% of a clay stabilizing agent and 99-99.4% of water. With the workover fluid provided by the invention, effective temporary blocking can be realized upon a porous sandstone reservoir; and the harm of the workover fluid upon stratum can be reduced. The workover fluid also has the characteristic of good salt tolerance. With the workover fluid, hydrate blockage is not formed. The workover fluid is safe and environment-friendly, and is convenient for construction.

The invention discloses a temporary plugging workover fluid for a low-pressure carbonate reservoir gas well and preparation and an application method of the temporary plugging workover fluid. The temporary plugging workover fluid is composed of two slugs, wherein one is a low-solid phase water-locking type temporary plugging fluid slug, and mainly plays roles of forming a temporary plugging layerat a blasthole, bearing pressure of an upper fluid column and balancing formation pressure difference; the other slug is a water-based anti-swelling inhibitor slug, and mainly plays a role of furtherreducing damage caused by a small amount of workover fluid entering the reservoir due to micro-leakage. The temporary plugging workover fluid provided by the invention has the characteristics of lessleakage, small reservoir damage, strong pressure bearing capacity and water-locking capacity, good universality, non-toxicity, harmlessness, convenient construction, easy flowback, high safety, environmental protection and the like, is mainly used for temporarily plugging and killing the well in the carbonate reservoir during workover, is particularly suitable for workover of the low-pressure carbonate reservoir gas well having tubular columns with packers, and can reduce the damage of the workover fluid to the formation.

The invention relates to a clay stabilizer and a preparation method thereof. Epichlorohydrin, dimethylamine, allyltrimethylammonium chloride and gamma-(methacryloyloxy)propyltrimethoxysilane undergo a reaction under action of an initiator and a hydrolysis inhibitor for hydrolysis inhibition to produce the clay stabilizer. The clay stabilizer is injected into a stratum and then undergoes a hydrolysis reaction to produce a silicon hydroxyl group for a condensation reaction with stratum clay so that clay hydration expansion and dispersion transfer are controlled, anti-swelling effects are good and molecular weight is low. The clay stabilizer is suitable for a low permeability reservoir.

The invention provides a preparation method of a self-suspension propping agent. The preparation method comprises the following steps: mixing a pre-heated propping agent matrix and a polymer capable of being swollen with water; in a stirring process, spraying a silane coupling agent solution into a mixture; and reacting for 3h to 4h at a temperature of 60 DEG C to 80 DEG C to obtain the self-suspension propping agent. According to the preparation method of the self-suspension propping agent, the silane coupling agent and the polymer capable of being swollen with the water are used for coating the propping agent matrix so that a cross-linking agent is realized; the silane coupling agent is connected with the propping agent matrix by adopting a siloxane chemical bond and is also subjected to a chemical reaction with the polymer to form a chemical bond; the self-suspension propping agent provided by the invention has a good anti-shearing capability and a great buoyant force; the self-suspension propping agent has long suspension time in clean water; a toxic organic solvent does not need to be added and a gel breaking performance is good; and gel breaking liquid has a relatively good anti-swelling performance and a strong crack backward flowing capability.

The invention relates to a monomer (methyl) acrylyloxyethyl trimethyl ammonium chloride of a poly-quaternary ammonium salt. The monomer is synthesized through following steps: (1) with (methyl) acrylic acid and a choline salt compound as raw materials and in a mixed solvent system composed of a catalyst 4-dimethylaminopyridine (DMAP), a dehydrating agent N,N-dicyclohexylcarbodiimide (DCC) and a solvent acetonitrile, carrying out an esterification reaction at 5-50 DEG C for 8-15 hours to synthesize the monomer (methyl) acrylyloxyethyl trimethyl ammonium chloride of a poly-quaternary ammonium salt in one step. The monomer (methyl) acrylyloxyethyl trimethyl ammonium chloride of the poly-quaternary ammonium salt can be reacted with various vinyl monomers to synthesize high-molecular materials having various functions, for example, the monomer can be co-polymerized with acrylamide to synthesize a novel poly-quaternary ammonium salt compound which can be used as a clay expansion inhibitor used in oilfield exploitation, a sewage treatment agent and the like.

The invention relates to the technical field of an anti-swelling agent used in oil exploitation, and in particular relates to an anti-swelling oil-displacing agent as well as a preparing method and a using method of the anti-swelling oil-displacing agent. The anti-swelling oil-displacing agent comprises the raw materials by mass percent: anti-phase demulsifier, petroleum demulsifier, potassium chloride and the balance of deionized water, wherein the anti-swelling oil-displacing agent is prepared by the method comprising the following steps: firstly, adding the required amount of potassium chloride into the deionized water, heating and stirring until the potassium chloride is completely dissolved to obtain potassium liquid; then, mixing the required amount of anti-phase demulsifier with the required amount of petroleum demulsifier, mixing the required amount of anti-phase demulsifier with the required amount of petroleum demulsifier for reaction to obtain primary emulsion; and finally, adding the potassium liquid into the primary emulsion to react to obtain the anti-swelling oil-displacing agent. Compared with the existing conventional anti-swelling agent, the anti-swelling oil-displacing agent has better anti-swelling effect; when being used for reinjection sewage work environment, the anti-swelling oil-displacing agent improves the effect of displacing oil from water, thus having better adaptability to the water of an oil field.

The invention provides an efficient anti-swelling swelled shrinkage agent for stratum treatment. The efficient anti-swelling swelled shrinkage agent for stratum treatment is prepared from the following substances (by weight): 30-55% of an organic polymer, 8-20% of inorganic salt, 2-8% of a fluorocarbon surfactant and the rest of water. The sum of weight percentages of the above substances is 100%. The prepared efficient anti-swelling swelled shrinkage agent for stratum treatment has strong adsorption capacity, good anti-swelling effect and scouring resistance. By the use of the fluorocarbon surfactant, interfacial tension can be reduced, capillary of an oil layer can be effectively dredged, and water locking phenomenon can be prevented. The product can be resistant to high temperature of 300 DEG C, can adapt to the anti-swelling process of low-permeability oil reservoir and has an excellent anti-swelling effect on oil reservoir with abnormal water sensitivity and velocity sensitivity.

The invention provides a preparation method of a high-temperature-resistant clay stabilizer for fracture acidizing. The method comprises the following steps: adding polyethyleneglycol and thionyl chloride in a certain ratio into a reaction kettle, adding an alkali solution to regulate the pH value of the solution, heating to react under reflux to obtain polychloroethane, adding the polychloroethane and ammonia water in a certain ratio into the reaction kettle, heating to react to obtain a polyethylenediamine-ammonium chloride solid mixture, dissolving the polyethylenediamine-ammonium chloride solid mixture in water, dropwisely adding ethylenediamine and acid liquor into the solution to obtain a viscous yellow liquid mixture, adding an inorganic salt, uniformly mixing, and drying by distillation to remove water and solvent, thereby obtaining the high-temperature-resistant clay stabilizer for fracture acidizing. The high-temperature-resistant clay stabilizer for fracture acidizing has favorable inhibiting actions on expansion, dispersion and migration of clay, has the advantages of excellent clay expansion resistance, favorable solubility, long effective period, no corrosiveness for equipment, low synthesis cost and simple synthesis method, and has favorable market application value.

The invention discloses an environment-friendly clay stabilizer. The environment-friendly clay stabilizer comprises, in parts by weight, 5-30 parts of a benzyl quaternary ammonium salt, 10-30 parts ofa heterocyclic polyquaternary ammonium salt, 35-40 parts of a sulfonyl quaternary ammonium salt and 5-40 parts of choline chloride, wherein the benzyl quaternary ammonium salt is prepared through a reaction among N-aminoethyl ethanolamine, formaldehyde and benzyl chloride, the heterocyclic polyquaternary ammonium salt is prepared through a reaction among N-aminoethyl ethanolamine, formaldehyde and dichlorodiethyl ether, and the sulfonyl quaternary ammonium salt is prepared through a reaction among diethanolamine, formaldehyde, diethyl sulfate and bis(diethanolamine) methane. The clay stabilizer has a wide pH application environment, high temperature resistance and high anti-expansion performance at the same time, is suitable for various downhole working liquids with pH values of 1-14, andhas resistance to a high temperature of 150 DEG C, an anti-swelling rate of larger than 88% and an anti-swelling performance duration time of more than 1 month, and it is verified through biocompatibility experiments that the semi-lethal concentration LC50 of the clay stabilizer is larger than 10000 mg / L; and therefore, the clay stabilizer has excellent environmental protection, and is suitable for an additive for preparation of fracturing fluids, acid solutions, perforating liquids, workover fluids and other types of downhole working fluids.

The invention discloses a method for long-acting protection of a reservoir and improvement of permeability of the reservoir. The method comprises the following steps: firstly, preparing dihalogenated polyether from polyether glycol and a halogenating agent, then preparing long-chain alkyl imidazole from halogenated alkane and imidazole, and finally, carrying out quaternization reaction on the dihalogenated polyether and the long-chain alkyl imidazole to prepare the novel polyether-bridged alkyl imidazolium salt. The polyether-bridged alkyl imidazolium salt prepared by the invention can be used as an additive for long-acting protection of the reservoir and improvement of the permeability of the reservoir.

The invention discloses an augmented injection liquid, a preparation method and application thereof. The augmented injection liquid comprises a carrying liquid and a nanometer silicon material, wherein the carrying liquid comprises the following components by weight: 0.1-1% of a biological surfactant, 0.1-2% of a biological enzyme, 0.5-2% of a cosolvent, 0.01-0.1% of microbial polysaccharide, and the balance of water, wherein the weight ratio of the carrying liquid to the nano silicon material is 100: (0.01-10). According to the augmented injection liquid, microbial metabolites are used as a dispersion system, synthesis and performance of a nano resistance-reducing augmented injection material are utilized, and technical mechanisms such as wetting reversal, adsorption, scouring resistance and pore and permeability increase of a nano material are comprehensively applied to reduce seepage resistance near a shaft, so that the validity period of measures is greatly prolonged.

The invention provides a surface sealing agent and a use method thereof. The surface sealing agent provided by the invention comprises 10-20 parts of a surfactant, 60-70 parts of an acrylic resin water soluble organic matter, 10-20 parts of a nano microcapsule paraffin emulsion and 0.1-1 part of a mildew inhibitor. According to the result of the embodiment, the surface sealing agent provided by the invention has excellent anti-swelling and anti-mildew properties. The expansion ratio of a fiber board in four weeks is just 0.4% which is far lower than 1.33% and 1.95% of the sealing agents sold in the market. Slight mildewing happens on the 30th day, and the mildewing time is greatly prolonged.