299results about How to "Oil displacement effect is good" patented technology

The invention discloses a hydraulic power pulse oil displacement experimental facility and an experimental method thereof. The experimental facility comprises a core clamping device, an annular pressure supply device, a hydraulic power pulse wave generating device, a water storage tank and an oil storage tank which are connected with the liquid inlet of the core clamping device by virtue of a water pipeline and an oil pipeline as well as a liquid container which is connected with the liquid outlet of the core clamping device; wherein the water pipeline and the oil pipeline are all provided with an intermediate container, a pumping device used for generating high pressure liquid flow and an energy storage tank. The experimental method includes the following steps: firstly, oil displacementexperiment is carried out under the condition that no hydraulic power pulse is added; secondly, oil displacement experiment is carried out while frequency and amplitude hydraulic power pulse wave of core are replaced, and meanwhile hydraulic power pulse auxiliary chemical oil displacement experiment is completed; thirdly, data processing is carried out. The invention has reasonable design, mounting convenience, simple operation and good simulation effect, can improve efficiency of oil displacement by water and crude oil recovery ratio, and experiment of hydraulic pulse wave oil displacement and hydraulic pulse wave auxiliary reservoir core oil displacement by water can be realized.

The invention discloses a method for improving the oil displacement efficiency of a medium-permeability core. The method comprises the following steps: taking a core for an experiment, washing oil away and drying the core, conducting a gas survey on the permeability of the core; preparing experimental simulated formation water and simulated oil; immersing the core into the simulated formation water to enable the core to be saturated with the simulated formation water; measuring the porosity, and calculating the pore volume; preparing simulated formation water solution, and replacing the saturated simulated formation water core; using simulated crude oil to replace the core to detect a nuclear magnetic resonance spectrum, using the simulated formation water solution to replace the core to calculate the oil displacement efficiency; injecting foam liquid+carbon dioxide to calculate the oil replacement efficiency, and detecting a nuclear magnetic resonance spectrum; injecting carbon dioxide gas+simulated formation water to calculate the oil replacement efficiency; injecting the foam liquid+carbon dioxide and carbon dioxide+simulated formation water containing the to calculate the oil displacement efficiency; comparing different nuclear magnetic resonances, adding the oil replacement efficiencies under different replacement methods, and obtaining the total oil replacement efficiency. According to the method for improving the oil displacement efficiency of the medium-permeability core, on-line tests can be achieved, a sample does not need to be disassembled and assembled, and practical testing is conducted to improve the oil replacement efficiency of the medium-permeability core.

The invention relates to a three-phase foam complex oil flooding system and application thereof. The three-phase foam complex oil flooding system consists of a foaming agent, a foam stabilizer, water and gas, wherein the foaming agent and the foam stabilizer are uniformly dispersed into the water to form an oil flooding system solution; the proportion of components is as follows: the foam stabilizer is 0.1-0.3% in percentage by mass, and the foaming agent is 0.1-0.4% in percentage by mass; the gas is nitrogen, carbon dioxide or natural gas; the volume ratio between the oil flooding system solution and the gas is 1:(1-1.5), and the oil flooding system solution and the gas are alternately injected into the stratum or rock cores. The three-phase foam complex oil flooding system disclosed by the invention can be used for reducing the liquid discharge speed of a liquid membrane, increasing the viscoelasticity and strength of the liquid membrane, and ensuring that the foam is more stable, has good oil flooding effects, and can be used for enhancing the oil recovery.

The invention relates to alkylphenol sulfonic polyoxyethylene ether sulfonate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts alkylphenol sulfonic polyoxyethylene ether sulfonate with general molecular formula (I)to solve the problem; wherein M is alkali metal; R is alkyl from C1-C22; n is any integer from 1 to 20. The alkylphenol sulfonic polyoxyethylene ether sulfonate can be applied to the production of tertiary oil recovery in oil fields.

The invention provides a foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2. The foaming agent is composed of the following components in percentage by weight: 0.12%-0.30% of anionic surfactant, 0.06%-0.15% of imidazoline-derived ampholytic surfactant, 0.12%-0.30% of lycine-derived ampholytic surfactant, 0.02%-0.04% of foam stabilizer and the balance of water. The foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2 is characterized in that the anionic surfactant, the imidazoline-derived ampholytic surfactant, the lycine-derived ampholytic surfactant and the foam stabilizer are combined so that the obtained foaming agent is capable of forming stable foam with the CO2, and thus is strong in foaming capacity and high in stability; the foaming agent has high plugging selectivity and can be used for plugging CO2 channeling in the displacement of reservoir oil by using CO2, and therefore, the plugging effects of plugging water rather than oil and plugging large rather than small can be achieved, and the oil recovery factor and the effect of the displacement of reservoir oil by using CO2 can be improved.

Use of dual alkyl carboxylate surface active agent as oil-displacing agent in the third oil extraction is carried out by mixing it composite base in proportion of Na2CO3: NaHCO3=1:1 and adding into hydrolytic polyacrylamide 0.2wt%. The oil-displacing agent consists of dual alkyl carboxylate surface active agent 0.01-1.0wt%, composite base 0.05-2.5wt%, hydrolytic polyacrylamide 0.2wt% and water residue. It's simple and cheap and can decrease interface tension between oil and water and have better oil-displacing effect.

The invention provides an amphiphilic Janus nano particle and a preparation method and application thereof. The preparation method comprises the following steps: dispersing silicon dioxide nanoparticles in water to obtain a dispersion liquid, mixing the dispersion liquid and liquid paraffin, heating and stirring in a water bath to form a Pickering emulsion, cooling to obtain small wax balls, adding a silane coupling agent into the small wax balls for modification to obtain modified small wax balls, mixing the modified small wax balls, an amidation catalyst and C12-C18 saturated fatty acid, andcarrying out an amidation reaction process to obtain organic hydrophobic chain grafted oil-water amphiphilic nanoparticles, and removing paraffin in the organic hydrophobic chain grafted oil-water amphiphilic nanoparticles to obtain the amphiphilic Janus nano particles. When the surfactant is used as an oil-displacing agent, oil-water interfacial tension can be effectively reduced at low concentration, rock wettability is changed, oil-displacing efficiency of nanofluid is remarkably improved, economic cost is reduced, and the surfactant has a wide application prospect.

The invention relates to a composite foam flooding method suitable for oil field exploitation, comprising the following steps that: pretreated prepositive polymer plug is injected into the formation, and the injection volume of the polymer plug is 8-15% of the total pore volume of the formation; composite foam flooding auxiliary plug is injected into the formation, and the injection volume of the composite foam flooding auxiliary plug is 5-10% of the total pore volume of the formation; composite foam flooding main plug is injected into the formation, and the injection volume of the composite foam flooding main plug is 30-60% of the total pore volume of the formation; and follow-up protective polymer plug is injected into the formation, and the injection volume of the follow-up protective polymer plug is 10-20% of the total pore volume of the formation. With the adoption of the composite foam flooding method suitable for oil field exploitation, a good flooding effect can be obtained.

The invention discloses a method for improving the recovery ratio of indigenous microbial enhanced oil recovery. The method comprises the following steps: acquiring a fluid sample on a target reservoir site; analyzing an indigenous microbial community structure; determining an indigenous activator and the injection quantity thereof; selecting an on-site injection process of the indigenous activator; evaluating a physical analog enhanced oil recovery; performing on-site tests, and tracking and analyzing of on-site test effects. The method is reasonable, simple in process, easy to operate, safe and reliable, beneficial to on-site popularization and application, and low in investment and cost, greatly improves the on-site test effect, improves the recovery ratio of more than 12% during indigenous microbial enhanced oil recovery on-site tests, and thus can be widely applied to on-site tests for improving the recovery ratio of indigenous microbial enhanced oil recovery.

The invention relates to a polymer flooding alternating injection method of a heterogeneous oil reservoir, which comprises the step of alternatively injecting high-viscosity slug and low-viscosity slug into the heterogeneous oil reservoir, wherein the step of alternating injection is carried out at least for one time. The high-viscosity slug and the low-viscosity slug are solutions provided with different concentrations and obtained by mixing polymers with different molecular weights and saline water. By means of the polymer flooding alternating injection method, the polymer flooding operation in an alternating injection method can inhibit profile reverse rotation, increase liquid absorption amount of a low-permeability layer, control low-efficiency and ineffective circulation, effectively utilize the reserve volume of the low-permeability layer, improve the yield rate and reduce polymer using amount.

The invention provides a xanthan gum graft copolymer oil displacement agent as well as a preparation method and application thereof. Based on molecular design, at least two of acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and N,N-dimethylacrylamide (DMAM) are graft-copolymerized to xanthan gum macromolecules. Since the copolymerized side chain is introduced, the viscoelasticity, heat resistance and biological stability of the xanthan gum macromolecules can be greatly enhanced; the xanthan gum graft copolymer can be used as an oil displacement agent for tertiary oil recovery simultaneously; and the solution rate of the xanthan gum graft copolymer is obviously increased, and the xanthan gum graft copolymer can not easily generate gel in brine. When the xanthan gum graft copolymer oil displacement agent is used in a high-temperature high-salinity oil reservoir, the oil displacement effect is enhanced.

The invention discloses a dualistic superposed wave reinforced oil displacing experiment device and an experiment method. The dualistic superposed wave reinforced oil displacing experiment device comprises an artificial resonance wave test table, a rock core holder, a ring-pressure supplying device, a hydraulic impulse wave generator, a high-pressure water tank, a high-pressure oil tank and a liquid container, wherein the hydraulic impulse wave generator is arranged between a liquid outlet of the high-pressure water tank and the rock core holder, the high-pressure water tank and the high-pressure oil tank are connected with a liquid inlet of the rock core holder through a water pipeline and an oil pipeline, the liquid container is connected with the liquid outlet of the rock core holder, middle transition containers are respectively arranged on the water pipeline and the oil pipeline. The experiment method comprises the following steps of: firstly, under the condition of no dualistic superposed waves, carrying out a reinforced oil displacing experiment; secondly, replacing a rock core and carrying out the reinforced oil displacing experiment on a plurality of rock cores under two wave field conditions of artificial resonance waves and hydraulic impulse waves which have different frequencies and amplitudes; and thirdly, processing data. The method has the advantages of rationaldesign, convenient distribution, complete functions, simple and convenient operation and good simulation effect and can test the final recovery ratio and the residual oil saturation of different rockcores under the conditions of two wave fields.

The invention discloses a nano oil displacement agent and a preparation method and application thereof. The nano oil displacement agent is characterized by comprising a nanometer material, a surfactant, a water-soluble polymer and water, and the water-soluble polymer is coated at the periphery of the nano material. The nano oil displacement agent is a temperature-resistant and salt-resistant oil-displacing agent, and ensures that a functional nano dispersion liquid does not flocculate or precipitate within a certain temperature and salinity range, the water-soluble polymer can be slowly decomposed under the conditions of high temperature and high salt, and meanwhile, the nano material is released, so that the functional nano material plays a role.

The invention relates to fatty acid polyethenoxy ether sulfonate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts fatty acid polyethenoxy ether sulfonate with general molecular formula (I)CnH2n+1COO(CH2CH2O)mCH2CH2SO3M to solve the problem; wherein M is alkali metal; n is any integer from 10 to 24; m is any integer from 1 to 10. The fatty acid polyethenoxy ether sulfonate can be applied to the production of tertiary oil recovery in oil fields.

The invention relates to an alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and aims to mainly solve the problem that a present oil displacement system has poor oil displacement efficiency under the condition of high-temperature high wax-bearing oil reservoirs. The alkali-free oil displacement system suitable for high-temperature high wax-bearing oil fields comprises a long-carbon-chain betaine surfactant, polymer and water. The betaine surfactant is any one selected from carboxylate betaine and sulfonate betaine which are respectively as shown in the formula (I) and the formula (II), wherein R1 and R4 are any one independently selected from an alkyl group and an alkenyl group with C15-C29; R2 and R5 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C2-C5; and R3 and R6 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C1-C5. Water is selected from oilfield injection water. By the technical scheme, the above problem is solved well. The alkali-free oil displacement system can be used in tertiary oil recovery of high-temperature high wax-bearing oil fields.

The invention relates to alkylphenol sulfonic polyoxyethylene ether carboxylate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts alkylphenol sulfonic polyoxyethylene ether carboxylate with general molecular formula (I)to solve the problem; wherein M is alkali metal, ammonium group or amidocyanogen; R is alkyl from C1-C22; n is any integer from 1 to 20. The alkylphenol sulfonic polyoxyethylene ether carboxylate can be applied to the production of tertiary oil recovery in oil fields.

The invention provides a temperature resist, salt resist crosslinked polymer system with controllable crosslinking time and strength, comprising water, polyacrylamide, melamine, formaldehyde and additive, wherein the polyacrylamide 0.03-8 weight%, melamine 0.01-4 weight%, formaldehyde solution(35-38weight%) 0.03-10 weight%, additive <2 weight%. The salt content of oilfield sewage is less than 35 *104mg / L, the total content of Ca2+ and Mg2+ is less than 5000mg / L. The temperature range of reservoir bed is 30-110 degree, the crosslinking time is 6 hours-25 days, and the viscosity after crosslinking is less than 40*104mPa.s. The long-term stability is good. The viscosity is greatly increased compared to oil displacement of polymer, suitable for reducing the use concentration of polyacrylamide and the cost is reduced, at the same time the oil displacement effect is increased and the treatment difficulty of output liquid is reduced. The crosslinked polymer system can be useful for recycling the polyacrylamide output liquid of high concentration. The invention can be used in oilfield profile controlling, exclusion of water, leak stopping and oil displacement technique. The locale preparation is simple.

The invention relates to an indigenous microorganism activation and exogenous microorganism intensified oil production method in an offshore oilfield, which belongs to the technical field of producible oil index improvement, and includes the following steps: firstly, preparation of exogenous microorganism bacterial liquor: beneficial microorganisms separated from an oil deposit stratum are subjected to enrichment culture; secondly, preparation of indigenous microorganism activators: the mass percent of components are: 0.25%-0.5% byproduct molasses in sugar industry, 0.1%-0.2% byproduct corn steep liquor of corn starch, 0.2%-0.4% sodium nitrate and 0.1%-0.3% phosphate; and thirdly, underground activation of an indigenous microflora: the following stages are included: the first stage, exogenous microorganism bacterial solution is injected to improve amount of functional microorganisms and provide nutrition substrates for growth of anaerobic bacteria, and the second stage, indigenous microorganism activators are injected in the anaerobic part of a stratum to improve the oil recovery efficiency. The method has the advantages of simplicity in operation, strong suitability, no harm to an oil-bearing sand, zero pollution, improved recovery efficiency and the like.

The invention relates to an industrial production method of a dry rat glycolipid bio-surfactant powder. The method comprises the following steps of: (1) breeding a strain; (2) slantly culturing the strain; (3) carrying out enlarged culture on the strain; (4) industrially fermenting and culturing the strain; and (5) centrifuging a produced lipopeptide bio-surfactant fermentation liquor by a high speed centrifugal machine at a rotation speed of 8000 rpm / min, so as to respectively obtain a lipopeptide separating liquor and bacillus subtilis. The surface tension of the stoste of the lipopeptide bio-surfactant fermentation liquor produced with the method provided by the invention is less than 26 mN / m; and after being centrifuged to remove thalli and then diluted by 500 times, the stoste of the lipopeptide bio-surfactant fermentation liquor obtains the surface tension of less than 34 mN / m. The separated lipopeptide separating liquor can be used for ternary complex flooding oil-extraction; and the flooding effect of the lipopeptide separating liquor can be improved by 8-16% on the basis of water flooding. It is detected that the bacterial count of the separated bacillus subtilis can reach more than 10 billions in every 6 ml of the fermentation liquor; and the bacillus subtilis can be used for producing and processing EM (E Mycin) bacterial liquids and is applied to the fields, such as agriculture, livestock breeding, and sewage treatment (industrial sewage and breeding sewage).

The invention discloses an novel alkyl aryl alkylbetaine surfactant composition and its application in tertiary oil recovery, wherein the betaine type surfactant composition oil dispelling system or betaine type surfactant prepared from alkyl aryl alkylbetaine surfactant i.e. polymerized binary composite composition oil dispelling system and the underground crude oil can reach a ultralow interfacial tension of 0.001-0.0001 mN / m, thus can effectively substitute the residual oil in the oil reservoir.

The invention relates to alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate with general molecular formula (I)to solve the problem; wherein M is alkali metal, ammonium group or amidocyanogen; R is alkyl from C1-C22; n is any integer from 1 to 30. The alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate can be applied to the production of tertiary oil recovery in oil fields.

The invention relates to a wellhead pressure monitoring method and a control system. The method is used for multilayer oil reservoir polymer flooding profile reversal recognition, and comprises the following steps that the polymer injection well variable flow test is designed and implemented by adopting a variable flow well test principle; the wellhead pressure change is monitored in stages; accurate pressure and flow data is obtained during the test period, and the variable flow well test can be performed under the well opening condition; the wellhead pressure is converted into the well bottom pressure by considering the well tube friction and the polymer rheological property and using a converting module; the wellhead pressure is monitored for many times, and the converted well bottom pressure data is subjected to well test explanation by combining the actual pressure monitoring data and using an anisotropic multilayer oil reservoir polymer flooding model to obtain the formation conductivity of high-permeability and low-permeability layers; and the data is converted into the conversion condition of the fractional flow rate of the low-permeability layer for recognizing the profile reversal according to the obtained formation conductivity of each formation. A wellhead pressure test monitoring method is used, so that the limitation that a pressure meter of a pipe column structure cannot enter the well is avoided; and meanwhile, the pressure test cost is reduced.

The invention relates to surface active agent combination and the application of the combination which solve the disadvantages of bad displacement efficiency under the condition of high temperature and high salt, bringing harm to the strata due to the containing of alkali, equipment and channel corrosion and high production cost found in the oil displacement agent which contains surface active agent in the prior art. The surface active agent combination and the application of the combination solves the problem through the technical proposal of the surface active agent combination which contains fatty alcohol-polyoxyethylene ether sulfonates, polymers and water; the surface active agent combination is applicable to the tertiary oil recovery production of the oil field.

The invention provides a high-efficiency oil displacement agent. The high-efficiency oil displacement agent consists of C12 to C16 alkyl benzene sulfonates serving as an anionic surfactant, a dianionic surfactant, nonylphenol polyoxyethylene ether (OP-10) and water. The high-efficiency oil displacement agent has the advantages of high activity, good oil displacement effect and capability of substantially meeting the requirements of different salinity conditions of onshore oil fields in China. The ratio of input to output is about 1 to 6, and the application range expands continuously, so the high-efficiency oil displacement agent is practical and high-efficiency technology.

The invention discloses a gemini surfactant for a tertiary oil recovery chemical oil-displacing agent. The gemini surfactant has the structural formula shown in the specifications, wherein R1 and R2 are alkyl with 11 to 23 carbon atoms respectively. The surfactant of the invention has the advantages of single use without adding an alkali, harmlessness to a stratum, stable property, high capacity of reducing the oil / water interfacial tension and ensuring ultralow interfacial tension of 10<-3> to 10<-4>mN / m of crude oil / water in a wider range, and ideal oil displacing effect. The problem that the oil displacing efficiency of the conventional oil-displacing agent is reduced due to chromatographic separation is solved.

The invention discloses a temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water. The temperature-resisting salt-tolerant foam adjusting displacing system comprises the following components by weight percent: 0.5%-2% of nano-SiO2, 0.01-2% of THSB, 0.01-0.5% of HPAM, 0.01-0.3% of citrate and the balance of water. The invention discloses a preparation method of the temperature-resisting salt-tolerant foam adjusting displacing system. The preparation method comprises the following steps: firstly adding citrate and nano-SiO2 into water at 25 DEG C; stirring and then ultrasonically treating; adding THSB and stirring; adding partial hydrolysis HPAM and stirring, thereby acquiring the end product. The invention also discloses an oil displacement method adopting the adjusting displacing system. The oil displacement method comprises the following steps: (1) injecting a THSB aqueous solution on a prepositioned pretreated section into stratum; (2) injecting an adjusting displacing system and a pure nitrogen system of a main section into stratum; (3) injecting a nano-SiO2 aqueous solution on a post-positioned protection section into stratum; (4) closing well for 5-10 days, opening the well and recovering production. The compound adjusting displacing system provided by the invention can be applied to high-temperature high-salinity oil deposit and has high ageing stability. Multiple alternate oil displacing sections are arranged, so that the oil displacement effect of the system is extremely promoted.

The invention discloses an novel alkyl aryl alkyl-sulfonate surfactant composition and its application in tertiary oil recovery, the surfactant-alkali-polymeric ternary oil driving system prepared from the surfactant and the underground crude oil can reach a ultralow interfacial tension of 0.0001-0.00001 mN / m, thus can effectively substitute the residual oil in the oil reservoir, the crude oil recovery factor can be increased by over 30%.