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38results about How to "EOR effect" patented technology
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Method for improving carbon dioxide displacement yield by using surfactants
The invention discloses a method for improving the carbon dioxide displacement yield by using surfactants. The method comprises the following steps of: uniformly mixing selected surfactants and supercritical carbon dioxide according to a mass ratio being (0.00061:1) to (0.00338:1) under the conditions of the pressure being 8MPa and the temperature being 50 DEG C to be used as displacement agents; and injecting the displacement agents into an oil reservoir. The method has the advantages that the surfactants capable of reducing the minimum miscibility pressure of carbon dioxide and crude oil can be preferably selected; and when the surfactants are added in the injected carbon dioxide for carbon dioxide displacement operation, the carbon dioxide displacement yield can be improved.
Owner:PETROCHINA CO LTD +1
Oil-displacing agent and oil-displacing method for enhancing recovery ratio of high-temperature, high-salinity and high-hardness reservoir crude oil
ActiveCN103254883ALow critical micellar concentrationStrong ability to reduce interfacial tensionFluid removalDrilling compositionChemistryAlkylphenol
The invention relates to an oil-displacing agent and an oil-displacing method for enhancing the recovery ratio of high-temperature, high-salinity and high-hardness reservoir crude oil. The oil-displacing agent is composed of the following components in percentage by mass: A, 0.05-0.07% of an amine oxide type amphoteric surfactant; B, 0.15-0.20% of alkylphenol ethoxylate carboxylate; and C, the balance of water. The oil-displacing method disclosed by the invention is implemented through injecting the oil-displacing agent into a natural core subjected to oil-displacing under the conditions that the oil reservoir temperature is 100-120 DEG C, the total salinity of formation water is (10-15)*10<4> mg / L, and the amount of calcium-magnesium divalent metal ions is 7000-10000 mg / L, so that residual oil is in contact with the oil-displacing agent, and then the residual oil is fully displaced. The oil-displacing agent provided by the invention reaches the magnitude order of 10<-3> mN / m under the condition of high-temperature, high-salinity and high-hardness salt reservoirs, and the interfacial tension still can be maintained in an ultra-low interfacial tension state after the oil-displacing agent is aged for a long time under the condition of oil reservoirs, therefore, the oil-displacing agent is applied to the tertiary oil recovery production of oil fields.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Experimental device for simulating substrate-crack static/dynamic imbibition and oil discharge and method of experimental device
ActiveCN109883917AClarify the law of mass transferSimple structurePermeability/surface area analysisInjection pumpGas separation
The invention discloses an experimental device for simulating substrate-crack static / dynamic imbibition and oil discharge and method of the experimental device. The experimental device for simulatingsubstrate-crack static / dynamic imbibition and oil discharge comprises a high-pressure gas cylinder, an injection pump, an intermediate container, a core holder and a back pressure pump, wherein the lower end of the intermediate container is connected with the injection pump, and the upper end of the intermediate container is connected with the high-pressure gas cylinder; a compact core is arrangedat the inner bottom of the core holder; a fracturing proppant compaction belt is arranged at the upper end of the compact core; a left through hole and a right through hole are separately formed in the position, located on the end surfaces of the cylinder wall of the core holder, of the left end surface and right end surface of the fracturing proppant compaction belt; and a first through hole andthe left through hole are both connected with the upper end of the intermediate container, a second through hole and the right through hole are both connected with the right end of the back pressurepump, and an oil-gas separation and metering device is arranged at the upper end of the back pressure pump. The experimental device for simulating substrate-crack static / dynamic imbibition and oil discharge is used for studying the phenomenon of imbibition and diffusion of injected fluid from cracks to dense substrate under the condition of high temperature and high pressure, and the law of mass transfer between substrate-crack in the fractured dense oil reservoir is determined through the device and the experimental method, and reference is provided for enhancing oil recovery in the dense oilreservoir.
Owner:SOUTHWEST PETROLEUM UNIV
Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir
ActiveCN104087280AHigh mechanical strengthImprove plugging performanceFluid removalDrilling compositionWellheadChemistry
The invention discloses a blocking system and a blocking method for channeling inhibition in carbon dioxide non-miscible flooding of a low permeability reservoir. The system is mainly prepared from the following raw materials in percentage by weight: 1%-2% of fine mineral particles, 0.2%-0.3% of polymer, 0.01%-0.02% of compound crosslinking agent, 0.04%-0.1% of retarder, 0.01% of deoxidant, 0.1%-0.5% of surfactant and the balance of water. By virtue of monitoring the steam injection pressure of a wellhead in real time and adjusting the system, graded control of high-pressure steam injection, 'gas channeling' and 'escape channeling' processes in the carbon dioxide non-miscible flooding is realized and the development effect of the carbon dioxide non-miscible flooding of the low permeability reservoir is improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1
Heavy oil displacement method using wedged vicious slug
The invention relates to a heavy oil displacement method using a wedged vicious slug. The method includes the steps of 1, dividing a nonhomogeneous reservoir into a plurality of layers according to water absorbing capacities, and acquiring permeability Ki of each reservoir; 2, designing three slugs, namely a pre-slug, a main wedged slug and a trailed slug, according to the permeabilities Ki and the physical properties in heavy oil and reservoirs; 3, alternately injecting the heavy oil reservoir with the pre-slug which is prepared with low-concentration B III-type poly-surfactant and which enters a high permeability layer to emulsify crude oil; 4, injecting the reservoirs with the main wedged slug for multiple rounds; and 5, injecting the trailed slug with low-concentration B III-type poly-surfactant or fresh water generally. In each round, the main wedged slug is divided into three small slugs; the small slugs in each round are combined by regulating the corresponding concentrations by the B III-type poly-surfactant according to formation permeability. According to the method, the nonhomogeneous heavy oil reservoirs are emulsified to reduce viscosity, the wedged equivalent vicious slug is used for equi-fluidity displacement, and swept volume is increased; accordingly, recovery efficiency of heavy oil can be further increased, investment can be reduced and operation can be simplified.
Owner:DAQING DAHUA HONGYE PETROLEUM ENG TECH
Petroleum sulfonate anionic surfactant and preparation method thereof
InactiveCN102190605AHigh yieldPrevent dehydrationTransportation and packagingSulfonic acids salts preparationSulfur trioxideSolvent
The invention relates to a petroleum sulfonate anionic surfactant and a preparation method thereof. The method comprises the following steps: mixing a crude oil fraction and a solvent phase, and carrying out sulfonation reaction at -20-30 DEG C by using liquid sulfur trioxide or fuming sulfuric acid as a sulfonating agent; aging the sulfonated product, and carrying out neutralization reaction until the reaction product becomes neutral or slightly alkaline; and separating the product of the neutralization reaction to obtain the petroleum sulfonate anionic surfactant. The invention also provides a petroleum sulfonate anionic surfactant prepared by the method. The preparation method has the characteristics of simple preparation technique, low investment cost and the like. The petroleum sulfonate anionic surfactant prepared by the method has higher adaptability and oil displacement efficiency than other chemical oil displacement agents.
Owner:北京伟实节能科技发展有限责任公司
Method for improving recovery ratio of non-homogeneous pay
InactiveCN102650206AEnhanced overall recoveryEOR effectFluid removalPolymer scienceEconomic benefits
The invention relates to a method for improving the recovery ratio of a non-homogeneous pay. The method is a method for alternately injecting a foam slug and an alkali and surfactant binary solution slug to improve the recovery ratio of the non-homogeneous pay, and comprises the following steps: injecting the foam slug into an oil layer; and then injecting the alkali and surfactant binary solution slug to complete one injection period, wherein the total injection amount of the foam slug is 60 percent to 100 percent of the total pore volume of the oil layer, the total injection amount of the alkali and surfactant binary solution slug is 20 percent to 40 percent of the total pore volume of the oil layer and the one to four injection periods are carried out. The method for improving the recovery ratio of the non-homogeneous pay, which is provided by the invention, is low in cost, has obvious effect of improving the recovery ratio, can obtain good economic benefits and has wide application prospect.
Owner:PETROCHINA CO LTD +1
Compound oil-displacing agent for high temperature reservoir and compound oil-displacing system
ActiveCN105038752AImprove long-term thermal stabilityEasy injectionDrilling compositionEmulsionOil water
The invention discloses a compound oil-displacing agent for a high temperature reservoir and a compound oil-displacing system. The compound oil-displacing agent is prepared from the following components in parts by mass: 5-15 parts of polymer, 40-100 parts of negative and non-ionic compound surfactant and 50-200 parts of NaCl. After the compound oil-displacing agent is mixed with water, the compound oil-displacing system capable of forming micro emulsion in a high temperature reservoir is formed; the compound oil-displacing system can act with crude oil to form stable micro emulsion and has the characteristics of strong oil-water solubilizing capability and ultra-low interface tension; the oil-displacing system is capable of resisting temperature of 105 DEG C, has good long-term thermal stability and good injectivity, and can obviously improve the recovery efficiency; and the oil-displacing agent is suitable for a high temperature reservoir of which the reservoir temperature is 80-105 DEG C, the permeability rate is equal to or higher than 200*10<-3>mu m<2> and the salinity is 0-100000mg / L, and the crude oil recovery ratio is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in clay stabilizer
ActiveCN101691335AImprove anti-expansion performanceReduce penetrationOrganic compound preparationAmino-carboxyl compound preparationReaction temperatureCarboxylic acid
The invention discloses carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in a clay stabilizer. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride has double functions of oil displacement and swelling prevention, is particularly suitable for a low-permeability and water-sensitive crude oil reservoir, and consists of the following main components in percentage by mass: 10 to 30 percent of carboxylic acid higher alcohol ester-trimethyl ammonium chloride, 1 to 20 percent of trimethylamine hydrochloride and 50 to 90 percent of water. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride is realized by the technical scheme of: adding an excessive trimethylamine aqueous solution and alpha-chlorinated fatty acid into a pressure reaction kettle; under the condition of the stirring, controlling the reaction temperature to between 50 and 100 DEG C, the reaction pressure to be between 1 and 0.2 MPa, and the reaction time to be between 3 and 5 hours; after the reaction is finished, reducing the temperature to between 40 and 50 DEG C; dripping 30 percent hydrochloric acid into a reaction solution so as to control the pH value of the reaction solution to between 6 and 8; and then diluting the reaction solution to certain concentration by using clear water to obtain an oil displacing type surfactant used for preventing swelling.
Owner:孙豫庆
Nano material as well as preparation method and application thereof
ActiveCN113185657AEmbodies the interface activity gain effectReduce interfacial tensionDrilling compositionHydrophilic monomerPolymer science
The invention discloses a nano material which is prepared by carrying out polymerization reaction on a mixture containing coupled montmorillonite, an organic hydrophobic monomer, an organic hydrophilic monomer and an initiator. The nano material used in a low-permeability oil field is provided, after the nano material and a surfactant generate a synergistic effect, a gain effect is reflected, and a nano-oil displacement agent is obtained. The nano material has the advantages of good long-term stability, low interfacial tension and recovery efficiency improvement.
Owner:NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
Gas injection oil well selecting method
The invention discloses a gas injection oil well selecting method. The gas injection oil well selecting method comprises the step of selecting oil well gas injection effect influence factors, wherein the gas injection influence factors comprise construction positions, reservoir body types, well storage relations, remaining oil types, reserve sizes and water cut rising rules; and the step of conduction gas injection potential estimation on all oil wells in a working section sequentially according to the construction positions, the reservoir body types, the well storage relations, the remaining oil types, the reserve sizes and the water cut rising rules, and therefore the oil well to be subjected to gas injection primarily is selected. By means of the gas injection oil well selecting method, the oil well with gas injection potential can be rapidly selected, the gas injection periodic average oil increment is increased by years, up to now, the gas injection periodic average oil increment is greatly improved, and the gas injection effective rate can reach 96.1%. As a whole, by means of the gas injection oil well selecting method, ultra-deep layer fracture-cavity type oil deposit gas injection is greatly improved, the oil recovery effect is improved, and therefore the production benefits are greatly improved.
Owner:CHINA PETROLEUM & CHEM CORP
Composite oil displacing agent for high temperature oil fields
InactiveCN109666472AImprove long-term thermal stabilityEasy injectionDrilling compositionGlycosideSulfonate
The invention discloses a composite oil displacing agent for high temperature oil fields, wherein the composite oil displacing agent is prepared from the following raw materials by weight: 10-30 partsof alkyl glycoside, 5-10 parts of glyoxal, 5-10 of nanometer silica sol, 5-15 parts of an alkali, 25-40 parts of linear fatty acid alkanolamide, 0.1-5 parts of a sacrificial agent, 30-60 parts of sodium polyalkylbenzene sulfonate, 15-30 parts of glucoside, 22-30 parts of biological enzyme, and 5-10 parts of glycerin. According to the present invention, the composite oil displacing agent can resist a temperature of 105 DEG C, has good long-term thermal stability and good injection performance, and can significantly improve oil recovery rate.
Owner:沈阳慧超科技有限公司
Viscous-elastic particle oil-displacing agent with fluorescence characteristic and preparation method therefor
InactiveCN105273707ASimple post-processingExcellent temperature and salt resistance and shear resistanceDrilling compositionLuminescent compositionsWater bathsVinyl carbazole
The invention discloses a viscous-elastic particle oil-displacing agent with a fluorescence characteristic and a preparation method therefor. The oil-displacing agent is a terpolymer composed of three structural units: acrylamide, N-vinyl carbazole and 2-(dimethylamino)ethyl methacrylate. The preparation method is as follows: 100 parts of acrylamide is dissolved in 250-290 parts of water to prepare a solution, 0.3-0.5 part of 2-(dimethylamino)ethyl methacrylate is dissolved in 40-60 parts of water to prepare a solution, 0.0004-0.025 part of N-vinyl carbazole is dissolved in 0.2-4 parts of ethanol to prepare a solution, the solutions are added in a three-necked bottle in order, and the three-necked bottle is placed in water-bath at a temperature of 15-25 DEG C; after nitrogen input is carried out for 20min, a solution prepared after 0.015-0.035 part of potassium peroxodisulfate is dissolved in 20-40 parts of water is added into the three-necked bottle; when the temperature rise of the reaction solution is more than 1 DEG C, nitrogen input is stopped, after the reaction is finished, the three-necked bottle is placed in a water bath kettle, thermal insulation is carried out for 3-5h, then gel is taken out, cut into pieces, dried, crushed and screened, and a powdery product can be obtained.
Owner:CHINA PETROLEUM & CHEM CORP +1
Oil-displacing agent and oil-displacing method for enhancing recovery ratio of high-temperature, high-salinity and high-hardness reservoir crude oil
ActiveCN103254883BImprove performanceHigh temperature resistance and high salt resistanceFluid removalDrilling compositionCarboxylic saltAlkylphenol
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Carbonate reservoir microcosmic model, and preparation method and application thereof
The invention provides a carbonate reservoir microcosmic model and a preparation method and application thereof. The model preparation method comprises the following steps: cutting calcite crystals into crystal pieces; soaking crystal wafer in molten beewax to form a wax coating on the surface; adopting a carbon dioxide laser to remove the wax coating on the front surface of the corresponding crystal wafer according to the mapping shape of the target pattern channel on the front surface of the crystal wafer, and completing mapping re-etching of the target pattern channel; immersing the front surface of the crystal wafer into hydrochloric acid upwards and carrying out ultrasonic oscillation to etch the exposed channel pattern of the wax coating; drilling an inlet and outlet channel for communicating the etched channel with the outside; and covering the front surface of the crystal plate with a glass cover plate and an adhesive to bond the crystal plate, then cleaning the channel, and wetting and modifying the channel to obtain the carbonate reservoir microcosmic model. The carbonate reservoir microcosmic model preparation method is simple and rapid, the model bearing capacity is extremely high, and the carbonate reservoir microcosmic model preparation method can be used for researching the influence of wettability on the effect of improving the recovery ratio through carbonate water injection development.
Owner:CHINA UNIV OF PETROLEUM (BEIJING) +1
Method for enhancing oil recovery of low permeability sandstone reservoir
The invention relates to a method for enhancing oil recovery of a low permeability sandstone reservoir. A flexible microgel in-depth profile modifying agent is injected into an oil extraction well water distribution water pipeline of an ultralow permeability sandstone reservoir in the middle and later stage of fracture water injection, and the injection concentration of the flexible microgel in-depth profile modifying agent ranges from 100ppm to 10000ppm. According to the method, corresponding affected oil well stable production and increasing production duration of the water injection well is one to five years, after the flexible microgel in-depth profile modifying agent is injected into the water injection well of the ultralow permeability sandstone reservoir, oil increasing of an oil well can correspondingly reach 5% to 20% on the calculation basis generally, and the obvious effect of improving crude oil extraction rate is achieved.
Owner:PETROCHINA CO LTD
Method for extracting oil by utilizing indigenous microbe of oil pool subjected to polymer flooding
InactiveCN102116143BLow costImprove oil displacement efficiencyFluid removalDrilling compositionAmmonium molybdateDiammonium phosphate
The invention relates to a method for extracting oil by utilizing indigenous microbes of an oil pool subjected to polymer flooding. In the method, a method activating the indigenous microbes of the oil pool is adopted, and an activating agent comprises diammonium phosphate, sodium nitrate, molasses or cane sugar, compound amino acid, ammonium molybdate, copper sulfate, ferric chloride and zinc sulfate; and plugging can be further carried out on a deep channel and a roaring channel of the oil pool by injecting controlled-release nutritional agents and inorganic gel slugs. The method for extracting oil by utilizing the indigenous microbes of the oil pool subjected to the polymer flooding has obvious extraction rate enhancement effect, relatively low-cost used raw material and ground and underground dual environmental protection without increasing the difficulty of the post processing of produced fluids.
Owner:YANGTZE UNIVERSITY
Method for performing thick oil huff-puff cold recovery by using bio-nano materials
The invention discloses a method for performing thick oil huff-puff cold recovery by using bio-nano materials. The method comprises the following steps of: respectively preparing bio-nano slug liquids by using different bio-nano materials to form combined slugs, wherein the combined slugs are at least two of BioNanoEM bio-nano materials of A series, F series, L series and J series, and respectively stirring or stirring after diluting with water to form different bio-nano slug liquids; and during oil displacement treatment, sequentially injecting the different bio-nano slug liquids into an oil-containing porous medium according to the sequence, promoting seepage of an oil phase in pores, then performing water-phase oil displacement, pushing the bio-nano slug liquids to go deep into the oil-containing porous medium, expanding the sweep range of the bio-nano slug liquids, enabling the oil phase to flow out of the porous medium along with bio-nano emulsion for extraction and recovery, and realizing oil phase yield increase and recovery efficiency improvement. The method disclosed by the invention has the advantages of high efficiency, energy conservation, simple construction process, convenience in industrial application and the like, can improve the yield of a thick oil reservoir and has broad application prospects in the field of oil exploitation.
Owner:ZHEJIANG UNIV OF TECH
A Test Simulator for CO2 Injection to Enhance Coalbed Methane Recovery
Owner:HENAN POLYTECHNIC UNIV
A microscopic model of carbonate reservoir and its preparation method and application
The invention provides a carbonate rock reservoir microscopic model, a preparation method and application thereof. The model preparation method includes: cutting the calcite crystal into crystal slices; immersing the crystal slices in molten beeswax to form a wax coating on the surface; using a carbon dioxide laser to remove the corresponding surface of the crystal slice according to the mapping shape of the target pattern channel on the front of the crystal slice. Wax coating, to complete the mapping and engraving of the target pattern channel; immerse the crystal piece in hydrochloric acid with the face up and oscillate ultrasonically to etch the channel pattern exposed by the wax coating; drill the etched channel to communicate with the outside world. ; Cover the front of the crystal sheet with a glass cover sheet and an adhesive to bond the crystal sheet, then clean the channel and wet the channel to obtain a microscopic model of the carbonate reservoir. The preparation method of the microscopic model of the carbonate rock reservoir is simple and fast, the model has a strong pressure bearing capacity, and can be used to study the influence of wettability on the effect of water injection development of the carbonate rock to enhance the recovery factor and the like.
Owner:CHINA UNIV OF PETROLEUM (BEIJING) +1
Method for measuring flow controlling particle density under simulated real reservoir conditions
InactiveCN108709837AEOR effectGuarantee the success rate of constructionParticle suspension analysisHigh pressureEnvironmental geology
The invention discloses a method for measuring flow controlling particle density under simulated real reservoir conditions. The method comprises the following steps: step 1: determining the mass M1 ofthe simulated container; step 2: introducing a reservoir simulation liquid into the measuring system until no bubbles appear, and determining the total mass M2 of the simulation unit; step 3: calculating the mass M3 of the simulated container filled with the reservoir simulation liquid; step 4: drying the flow controlling particles to be treated and determining the mass M4 after drying; step 5: adding the dried treated flow controlling particles to the simulated container, and heating and pressing the simulated container to a preset temperature value and a preset pressure value, and then measuring the total mass M5 of the simulation unit in this state; step 6: calculating the density value of the flow controlling particles under simulated real reservoir conditions based on the measured masses of M1, M2, M3, M4 and M5. The measurement method can be measured under the real conditions of a simulated high temperature and high pressure reservoir, and the density of the particles under reservoir conditions can be tested.
Owner:CHINA PETROLEUM & CHEM CORP
A method for enhancing oil recovery in low-permeability sandstone reservoirs
The invention relates to a method for increasing oil recovery in a low-permeability sandstone reservoir; injecting a flexible microgel deep control and displacement agent into the water distribution pipeline of an ultra-low-permeability sandstone reservoir for fracturing water injection in the later stage of oil production well water distribution through a metering pump; The injection concentration of the flexible microgel deep control and displacement agent is 100ppm to 10000ppm; this method: 1) the duration of the stable production and increase of the oil well corresponding to the water injection well is 1 to 5 years; 2) the injection well of the ultra-low permeability sandstone reservoir is injected After the flexible microgel deep control and displacement agent, generally the corresponding oil wells can accumulate oil by 5% to 20%, and the effect of improving oil recovery is obvious.
Owner:PETROCHINA CO LTD
Carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in clay stabilizer
ActiveCN101691335BImprove anti-expansion performanceReduce penetrationOrganic compound preparationAmino-carboxyl compound preparationReaction temperatureCarboxylic acid
The invention discloses carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in a clay stabilizer. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride has double functions of oil displacement and swelling prevention, is particularly suitable for a low-permeability and water-sensitive crude oil reservoir, and consists of the following main components in percentage by mass: 10 to 30 percent of carboxylic acid higher alcohol ester-trimethyl ammonium chloride, 1 to 20 percent of trimethylamine hydrochloride and 50 to 90 percent of water. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride is realized by the technical scheme of: adding an excessive trimethylamine aqueous solution and alpha-chlorinated fatty acid into a pressure reaction kettle; under the condition of the stirring, controlling the reaction temperature to between 50 and 100 DEG C, the reaction pressure to be between 1 and 0.2 MPa, and the reaction time to be between 3 and 5 hours; after the reaction is finished, reducing the temperature to between 40 and 50 DEG C; dripping 30 percent hydrochloric acid into a reaction solution so as to control the PH value of the reaction solution to between 6 and 8; and then diluting the reaction solution to certain concentration by using clear water to obtain an oil displacing type surfactant used for preventing swelling.
Owner:孙豫庆
A kind of nanomaterial, preparation method and application thereof
ActiveCN113185657BEmbodies the interface activity gain effectReduce interfacial tensionDrilling compositionHydrophilic monomerActive agent
The present application discloses a nanomaterial, which is prepared by polymerizing a mixture containing coupled montmorillonite, organic hydrophobic monomer, organic hydrophilic monomer and initiator. The present application proposes a nanomaterial used in low-permeability oil fields. After synergistic action with the surfactant, a gain effect is exhibited, and a nano-oil displacement agent is obtained. Nanomaterials have good long-term stability, low interfacial tension and enhanced oil recovery.
Owner:NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
Enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs
ActiveCN106047324BGood deep migration abilityGood profile improvementDrilling compositionPhysical chemistryCross linker
The invention belongs to the field of oilfield chemistry, and in particular relates to an enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt oil reservoirs. The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs is composed of functional polymers, cross-linking agents, inorganic reinforcing agents, and water in the following mass fractions: functional polymers, with a mass concentration of 0.4 to 0.6 %; cross-linking agent mass concentration 0.4-0.8%; inorganic reinforcing agent, mass concentration 0.2-0.3%; the balance is water. The average particle size of the enhanced jelly dispersion deep control and displacement agent of the present invention is distributed from nanometer to micron level, can be used for deep control and displacement of low permeability reservoirs, has good deep migration ability, good profile improvement effect, and enhanced recovery factor The effect is remarkable; the deep control and displacement agent can be used for deep control and displacement operations in high-temperature and high-salt oil reservoirs. Effectively improve the formation profile, significantly increase the follow-up water flooding sweep coefficient, and further increase the recovery factor.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Low-cost environment-friendly surfactant and preparation method thereof
InactiveCN112625668AReduce interfacial tensionWith temperature and salt resistanceFatty acid chemical modificationTransportation and packagingBetaineActive agent
The invention provides a low-cost environment-friendly surfactant and a preparation method thereof, and relates to the field of research of surfactant oil displacement agents for improving the recovery ratio of tertiary oil recovery. The low-cost environment-friendly surfactant is prepared from the following components in parts by weight: 100-110g of castor oil acylaminopropyl betaine (the effective content is 98%), 20-30g of lauroyl diethanolamide (the effective content is 99%), 50-60g of double rhamnolipid (the effective content is 50%) and 180-190g of tap water. The low-cost environment-friendly surfactant disclosed by the invention belongs to a bio-based zwitterionic surfactant, has the characteristics of anions and cations, can resist stratum adsorption and dilution, has certain temperature resistance and salt resistance, and has interfacial tension of 10<-3>mN / m under a high-temperature and high-salinity oil reservoir (80 DEG C or above and the mineralization degree of 10000ppm or above), and if the surfactant is compounded with petroleum sulfonate surfactants, the interfacial tension is lower, and the effect of improving the recovery ratio is obvious.
Owner:TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
Well Selection Method for Gas Injection Oil Well
The invention discloses a gas injection oil well selecting method. The gas injection oil well selecting method comprises the step of selecting oil well gas injection effect influence factors, wherein the gas injection influence factors comprise construction positions, reservoir body types, well storage relations, remaining oil types, reserve sizes and water cut rising rules; and the step of conduction gas injection potential estimation on all oil wells in a working section sequentially according to the construction positions, the reservoir body types, the well storage relations, the remaining oil types, the reserve sizes and the water cut rising rules, and therefore the oil well to be subjected to gas injection primarily is selected. By means of the gas injection oil well selecting method, the oil well with gas injection potential can be rapidly selected, the gas injection periodic average oil increment is increased by years, up to now, the gas injection periodic average oil increment is greatly improved, and the gas injection effective rate can reach 96.1%. As a whole, by means of the gas injection oil well selecting method, ultra-deep layer fracture-cavity type oil deposit gas injection is greatly improved, the oil recovery effect is improved, and therefore the production benefits are greatly improved.
Owner:CHINA PETROLEUM & CHEM CORP
A carbon dioxide immiscible flooding inhibition and plugging system and plugging method for low-permeability reservoirs
ActiveCN104087280BAchieve gas solidificationImmobilizationFluid removalDrilling compositionMineral particlesCarbon dioxide flooding
The invention discloses a blocking system and a blocking method for channeling inhibition in carbon dioxide non-miscible flooding of a low permeability reservoir. The system is mainly prepared from the following raw materials in percentage by weight: 1%-2% of fine mineral particles, 0.2%-0.3% of polymer, 0.01%-0.02% of compound crosslinking agent, 0.04%-0.1% of retarder, 0.01% of deoxidant, 0.1%-0.5% of surfactant and the balance of water. By virtue of monitoring the steam injection pressure of a wellhead in real time and adjusting the system, graded control of high-pressure steam injection, 'gas channeling' and 'escape channeling' processes in the carbon dioxide non-miscible flooding is realized and the development effect of the carbon dioxide non-miscible flooding of the low permeability reservoir is improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1
Self-growing gel dispersion active fluidity control system and fluid channeling control method for hypotonic-tight reservoir
ActiveCN114634805ASelf-growthEasy to manufactureFluid removalDrilling compositionActive agentPhysical chemistry
The invention relates to the field of oilfield development engineering, and discloses a self-growing gel dispersion active fluidity control system and a fluid channeling control method for a low-permeability-tight reservoir. The system contains 100 parts by weight of a self-growing gel dispersion and 0.15-0.6 part by weight of a surfactant, the self-growing gel dispersoid is prepared by shearing and grinding nano-reinforced chromium-aldehyde double-group cross-linked integral gel, and the preparation method of the nano-reinforced chromium-aldehyde double-group cross-linked integral gel comprises the following steps: adding a functional polymer, a phenolic resin cross-linking agent, an organic chromium cross-linking agent and a nano-reinforcer into water, mixing, and curing. The system can be simply and rapidly prepared, is easy for deep injection by adjusting the size of gel dispersion particles, is wide in action range, high in stability and long in effective period of action, can avoid reservoir pollution, and does not affect the liquid production capacity of the reservoir. The gel dispersion particles can achieve self-growth in the low-permeability-tight reservoir fractures, and the fracture fluid channeling control effect is enhanced.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +2
Low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as preparation method and application thereof
ActiveCN113913168AImprove performanceHigh jelly strengthDrilling compositionOrganic acidHexamethylenetetramine
The invention relates to a low-temperature high-salt-resistant deep profile control and displacement crosslinking system as well as a preparation method thereof. The crosslinking system comprises the following components in percentage by mass: 0.1-0.7% of a polymeric flocculant, 0.1-0.8% of hexamethylenetetramine, 0.01-0.2% of resorcinol, and 0.05-1.0% of micromolecular organic acid, with the balance being water. The cross-linking system can be suitable for deep profile control and flooding of low-temperature (20-40 DEG C) high-salinity (the degree of mineralization is larger than 6.0*10<5> mg / L) oil reservoirs, the gelling time is controllable in 36-96 h, the freezing strength E-H level is adjustable. The preparation method is simple and practical, non-flowing high-strength gel can be formed at the low temperature, and the cross-linking system is good in stability and high in plugging strength under the high-salinity condition, effective plugging can be formed on a high-permeability stratum or a dominant channel, and the effect of improving the recovery ratio is remarkable.
Owner:CHINA PETROLEUM & CHEM CORP +1
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