2441 results about "Oil displacement" patented technology

The invention discloses a profile control oil-displacement agent for a core-shell type inorganic/organic polymer composite microballoon. A preparation method of the core-shell type inorganic/organic polymer composite microballoon comprises the following steps of carrying out surface modification of inorganic cores of inorganic nano-particles such as silica particles and magnetic particles, and carrying out graft polymerisation by a dispersion polymerization method or an inverse emulsion polymerization method to form polymer shells (such as polyacrylamide cross-linked copolymers) on the surfaces of the inorganic cores. The inorganic components and the organic components bind by chemical bonds so that the core-shell type inorganic/organic polymer composite microballoon has very stale structure. The core-shell type inorganic/organic polymer composite microballoon retains the advantages of polymer microballoons and inorganic particles, and has strong heat-resistant and mineralization-resistant capabilities, high plugging strength and good dilatancy. The core-shell type inorganic/organic polymer composite microballoon can move in rock pores and can plug the rock pores. When a plugging pressure difference is improved to a certain degree, elastic deformation of the core-shell type inorganic/organic polymer composite microballoon can be produced and the deformed core-shell type inorganic/organic polymer composite microballoon sequentially moves to a deep rock stratum part so that a liquid flow direction is changed gradually and a crude oil yield is improved. The profile control oil-displacement agent provided by the invention has a large potential.

The invention relates to an oil-water displacement efficiency experimental method of longitudinal and planar nonhomogeneous slab models, which comprises an oil-water displacement efficiency experimental method of a longitudinal nonhomogeneous slab model and an oil-water displacement efficiency experimental method of a planar nonhomogeneous slab model. The experimental method mainly comprises the following steps: 1. applying confining pressure to the core holder of a multilayer slab model, then vacuumizing the multilayer slab model with three layers slab model, injecting simulated formation water to saturate cores, and then heating; 2. injecting simulate formation oil in a piston type container into the core holder of the multilayer slab model, and carrying out water-oil displacement to establish bound water saturation level; and 3. injecting simulate formation water in the piston type container into the core holder of the multilayer slab model, and carrying out water-oil displacement to obtain accumulated displacement oil output and wateryield under different water injection multiples, and thereby, the oil displacement efficiency is obtained. The invention not only can carry out displacement experiment research on the longitudinal nonhomogeneous slab model at high temperature and pressure but also can carry out displacement experiment research of different flooding well networks on the planar nonhomogeneous slab model under high temperature and pressure. The highest pressure reached by the experimental method is 25MPa, and the highest temperature reached by the experimental method is 100 DEG C.

The present invention discloses one kind of hydrophobic associated and micro cross-linking polymer oil displacing agent and its preparation process. The hydrophobic associated and micro cross-linking polymer oil displacing agent is prepared through compounding water solution of water soluble hydrophobic associated copolymer of acrylamide/(vinyl benzene sulfonic acid and/or 2-acryl amido-2-methyl propyl sulfonic acid)/(C0-C18 alkyl styrene and/or p-phenyl styrene) in 0.1-2 g/l concentration, cross-linking agent solution in 0.01-1.0 g/l concentration, surfactant solution in 0.01-8 mmol/l concentration and solution of heat stabilizer thiourea in 0.005-1.0 g/l concentration; mixing in a mixer with stirrer and regulating the solution pH to 4-11 to obtain the polymer oil displacing agent. The polymer oil displacing agent cross links during flowing in oil reservoir to increase solution viscosity, and has excellent application foreground in oil reservoir development.

The present invention belongs to the field of water-soluble functional high-molecular nano material, in particular, it relates to a nano water-soluble microgel oil displacement material and method for preparing said nano water-soluble microgel oil displacement material by adopting inverse microemulsion ligh-polymerization process. It is characterized by that said invention utilizes acrylamide/anionic monomer/third monomer to synthesize ternary copolymer nano-size microgel oil displacement material. Besides, said invention also provides the concrete steps of its preparation method.

The invention relates to a preparation method of an emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure. According to the method, materials are fed many times to carryout inverse emulsion low-temperature oxidation and reduction to initiate free radical polymerization so that water-solubility monomers (including acrylamide, ionic monomer I, the ionic monomer II and the third monomer) react with a cross-linking agent to generate the emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure. The invention also relates to the emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure, which is prepared by using the method. The profile/displacement control agent is a water-solubility microgel oil displacement material containing gel microspheres from nano scale to micron scale; with small initial grain size, the profile/displacement control agent can enter into the deep part of stratum; in addition, the profile/displacement control agent has high emulsion active component content and good flowability, can have volume expansion and mutual cementation under the actions of formation water and temperature according to the condition whether charges carried by the ionic monomers at a core layer and a shell layer are same or not; therefore the profile/displacement control requirements of different geological oil deposits of oil fields can be met.

The invention discloses acrylamide modified polymer micro-crosslinking gel and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps that: acrylamide modified polymer PAE containing functional macro monomer is prepared into an aqueous solution with the concentration between 0.1 and 4g/L, the concentration of crosslinking agent between 0.01 and 1.0g/L, the concentration of surface active agent between 0.01 and 8mmol/L and the concentration of heat stabilizer sodium sulfite between 0.005 and 1.0g/L; the aqueous solution is added in a mixing container with a stirring device and is stirred evenly at room temperature; the pH value of the solution is adjusted between 4 and 11 to prepare a polymer solution system of the acrylamide modified polymer micro-crosslinking gel used for tertiary oil recovery and displacement, oil displacement modification, profile modification or water plugging; and the polymer solution system undergoes micro crosslinking during flowing inside an oil layer to form the gel. The acrylamide modified polymer micro-crosslinking gel has ideal elasticity, difficult dehydration, stable performance and excellent performances on tackifying, temperature resistance, salt resistance, shearing resistance and ageing resistance.

The invention relates to an experimental method and a device for simulating the process that microcosmic remaining oil is extracted in a microcosmic simulation model under the condition of oil deposit high temperature and high pressure, researching feasibility of microorganism oil displacement technology in improving enhanced oil recovery after water drive, and carrying out visualized microcosmic oil displacement experimental research under the high temperature and high pressure experimental conditions, in particular to a high temperature and high pressure visual device for simulating microorganism oil displacement and a simulating method thereof. The device comprises a model clamp clamping a microcosmic visual model, a displacement system, a back pressure system, an annular pressure system, a pressure monitoring system, a temperature control system and an image collecting system. According to the device, temperature and pressure can be controlled easily, used space is small, safety performance is excellent, operation is simple, action mechanism of microorganism and petroleum hydrocarbon and starting mechanism of the microorganism on the remaining oil can be conveniently observed in a visualized condition, and the device has important significance on wide application and popularization of microcosmic experiments in oil industries.

The invention discloses a water soluble copolymer with high viscosity and salt resistance, and a preparation method and an application thereof. The preparation method comprises the steps of: adding acrylamide 20 weight parts, an anionic monomer or/and a cationic monomer 0.1-15 weight parts,, a vinyl polycyclic aromatic hydrocarbon 0.05-4 weight parts,, a surfactant 0.5-90 weight parts,, and deionized water 70-900 weight parts, into a three-neck reaction bottle, adjusting the solution pH to 2.5-9, introducing N2 for 30min, adding an initiator persulfate 0.001-0.2 weight parts, at 20-70DEG C, and reacting for 6-36 hours to obtain a low-molecular weight water soluble copolymer with molecular association ability, high viscosity and salt resistance, which can be used in intermediate-permeability oil reservoir and low-permeability oil reservoir development. An associated water soluble polymer oil displacement agent is obtained by preparing the copolymer into an aqueous solution with copolymer concentration of 0.3-3 g/L and surfactant concentration of 0.01-4 mmol/L, adding into a mixer with a stirring device, and stirring uniformly at room temperature; and the obtained oil displacement agent has high viscosity, salt resistance, temperature resistance and shear resistance, and can be used in intermediate-permeability oil reservoir and the low-permeability oil reservoir development.

The invention discloses a non-linear associated water soluble quadripolymer as well as a preparation method and use thereof, comprising: adding 20 parts of acrylamide, 1-20 parts of nionic monomer or/and cationic monomer, 0.1-15 parts of macromonomer, 0.05-10 parts of hydrophobic monomer, 0.1-50 parts of surfactant and 60-1000 parts of deionized water to a three-necked reaction flask, adjusting the pH to be 3-9, adding 0.002-1 part of initiator (persulphate) at 30-75 DEG C after introducing N2 for 30min, reacting for 8-36h to obtain the quadripolymer PACH, diluting with water, and obtaining concentrated PACH solution. The macromonomer with a long chain and the hydrophobic monomer with a molecular association function are simultaneously introduced in a copolymer PACH, which can obtain the best synergistic viscosifying between rigid conformation of a molecular chain and molecular association and salt resistance. The non-linear associated water soluble quadripolymer is obtained. The copolymer is prepared into aqueous solution with the mass concentration of 0.2-3g/l and the surfactant concentration of 0.01-2mmol/l, added to a mixing vessel with a stirring device and evenly stirred at the room temperature to obtain a viscosified, salt-resistant and shear-resistant polymer oil displacement agent. The PACH has dual functions of a viscosifier and a high molecular surfactant; minute amount of a low molecular surfactant is added to the PACH solution, thus improving the apparent viscosity of the solution, reducing the surface tension of solution and the water-oil interfacial tension, and being beneficial to improving the crude oil recovery ratio. A copolymer PABE is prepared into the aqueous solution with the mass concentration of 0.05-7% to obtain high molecular surfactant with excellent surface activity, and the high molecular surfactant is used as an emulsifier, a demulsifier, a solubilizer and a wetting agent.

The invention provides a foam profile control agent applicable to oil field in-depth profile control. The foam profile control agent provided in the invention comprises a polymer cross-linking solution and gas; under formation pressure, a volume ratio of the gas to the polymer cross-linking solution is 0.2: 1 to 1: 1; and the polymer cross-linking solution of the foam profile control agent comprises, by weight, 0.3 to 1.2 wt% of a surfactant, 0.01 to 0.8 wt% of a polymer, 0.001 to 0.2 wt% of a cross-linking agent, 0.001 to 0.1 wt% of a stabilizing agent and 0.05 to 1.5 wt% of inorganic salt, with the balance being water. The foam profile control agent has an effect on delaying cross-linking, can effectively plug a high-permeability zone, can reduce oil-water interfacial tension and has the effects of enlarging swept volume and improving oil displacement efficiency.

The invention discloses a comb-type structural reactive polymer with the molecular weight ranging between 1x10<5> and 5x10<6>, wherein the main chain of the reactive polymer is obtained through the copolymerization of acrylamide monomer and functional monomers such as 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid sodium salt, etc., which endues polymer aqueous solution with higher apparent viscosity and better temperature resistance and salt resistance; and the branched chain of the reactive polymer consists of unsaturated macromonomer molecule, which endues the polymer aqueous solution with higher surface activity. The invention also discloses a preparation method for the polymer, comprising the following steps: firstly, through process operation including esterification, prepolymerization and sulfonation, polyurethanes active macromonomer with a novel structure is prepared; then, under the action of oxidation reduction initiator, the copolymerization reaction of the active macromonomer and other functional micromolecule monomers is initiated quickly at low temperature. The comb-type structural reactive polymer can be used as oil displacement agent and has the advantages of high molecular weight and low surface tension, etc.

The invention relates to a sulphonated heat resistant and salt tolerant copolymer for an oil field and a preparation method thereof, which are mainly used for solving the problems that polyacrylamide has poor heat resistance and salt tolerance under the conditions of high temperature and high salinity, more monomers are introduced by copolymers and the content of the copolymers is high in the prior art. The problems are better solved through the technical scheme in which the sulphonated heat resistant and salt tolerant copolymer for the oil field and the preparation method thereof are provided, wherein the sulphonated heat resistant and salt tolerant copolymer for the oil field is obtained through the steps of introducing monomers with sulfonic groups on larger lateral groups to copolymerize with polyacrylamide, and then hydrolyzing. The sulphonated heat resistant and salt tolerant copolymer for the oil field, provided by the invention, can be used as an oil displacement agent for oilextraction in the oil field and can also be used in the oil field application field such as fracturing fluid thickening agent, water plugging/profile modifying agent, drilling fluid additive and the like. The preparation method provided by the invention is simple in process and easy for industrial production.

The invention relates to a corestone manufacture method, which comprises the following steps: (1) mold manufacture; (2) material preparation; (3) sand mixing; (4) molding; (5) pressurization; (6) electrode wire and pressure measuring pipe pre-burying in the corestone; (7) heating; (8) electrode lengthening wire welding; and (9) sealing. Compared with a physical model used at present, the invention has the advantages that indoor oil displacement experiments can be carried out under the condition of high pressure, the in-site production conditions can be simulated more accurately, oil-water distribution charts inside the model can be drawn more accurately, the oil-containing saturation change inside the corestone can be tracked in time, and the invention provides the scientific basis for the establishment of the development scheme.

The invention relates to a composite oil displacement agent containing a polymer and a cationic/anionic surfactant, and an oil displacement method, and mainly solves a problem of bad oil displacement efficiency of composite oil displacement agents used in the prior art. The composite oil displacement agent containing a polymer and a cationic/anionic surfactant includes the cationic/anionic surfactant, the polymer and water; the cationic/anionic surfactant comprises an anionic surfactant and a cationic surfactant according to a molar ratio of (1-100):1; the anionic surfactant is anyone of sulfonate, carboxylate and phosphate; the cationic surfactant is a quaternary ammonium salt or quaternary ammonium alkali; the polymer is modified polyacrylamide obtained by copolymerizing two monomers of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, and a molar ratio of the two monomers in the modified polyacrylamide is (1-4):1. The composite oil displacement agent solves the problem and can be used for enhanced oil displacement production of high temperature and low salinity oil reservoirs.

The invention relates to a temperature and salt resistant copolymer KWKY-PAD for oil field and a preparation method thereof, and mainly solves the problem that polyacrylamide is easy to hydrolyze at high temperature and high salinity in the prior art. The temperature and salt resistant copolymer KWKY-PAD as shown in formula (I) is obtained by the copolymerization of acrylamide and a N-alkyl substituted acrylamide derivative. The technical scheme provided by the invention greatly solves the problem. By the adoption of the preparation method, the hydrolytic stability of the copolymer is raised,and the copolymer has good viscosifying ability and hydrolytic stability at high temperature and high salinity as well as good temperature and salt resistance. The copolymer provided by the inventioncan be used in an oil displacement agent for oil extraction in oil field, and also can be used in oil field application fields of a thickening agent of fracturing fluids, a water plugging profile modification agent, a drilling fluid processing agent and the like. In addition, the preparation method requires less monomer, is simple and is suitable for industrialization.

The invention relates to a polymer and surfactant binary system for oil displacement, and an oil displacement method, and mainly solves a problem of bad oil displacement efficiency in the enhanced oil recovery process of composite oil displacement agents used in the prior art. The polymer and surfactant binary system for oil displacement comprises, by weight, 1 part of an anionic-nonionic surfactant, 0.05-50 parts of a zwitterionic surfactant and 0.5-50 parts of a low molecular weight polymer. The polymer and surfactant binary system for oil displacement can well solve the problem, and can be used in the enhanced oil recovery production of oilfields.

A 3D glass porous medium model for microscopic oil displacement is provided. The invention mainly solves the problem of the existing rock core model for microscopic oil displacement can not simultaneously assure high simulation degree and 3D visibility during the whole oil displacement process when conducting microscopic oil displacement experiment. The invention is characterized in that the model is formed by tightly bonding of at least three substrates made of glass material, a rock core planar pore channel (5) is respectively etched on the upper surface of a bottom substrate (12) and intermediate substrates (9, 10, 11), a plurality of throat channels (3) passing through the substrate are opened at a plurality of large apertures of the intermediate substrates (9, 10, 11), and a liquid injection channel (1) and a liquid outflow channel (2) are disposed on the model and respectively communicated with the large rock core planar pore channels (5) on the bottom substrate (12) and the first intermediate substrate (9). The invention can perform accurate 3D simulation of the rock core pore and assure high simulation degree during experiment, and the whole process is visible.

The invention relates to a composition capable of greatly improving crude oil recovery efficiency and a preparation method thereof, which mainly solve the problems in the prior art that the oil-displacing agent containing a surface active agent has poor oil displacement efficiency and high application concentration and alkali in alkaline-surfactant-polymer flooding brings corrosion and dirt harm on stratum and oil wells. By adopting the technical scheme of the surface active agent composition comprising fatty alcohol polyoxyethylene ether benzene sulfonate, polymer and water, the problems canbe well solved, and the composition can be used in tertiary recovery of an oil field.

The invention relates to a foam system suitable for profile control and oil displacement of an oil field and an oil displacement method, in particular to a foam system formula used for profile control and oil displacement of the oil field after polymer flooding and a foam profile control oil displacement method. The foam system formula comprises in percentages by weight: 0.1-0.5 wt% of surfactant, 0.05-0.4 wt% of foam stabilizer, 0.08-0.4% of thickening agent, 0.05-1.2 wt% of inorganic salt and the balance of water. In the foam profile control oil displacement method, a ratio of gas to liquid of the foam system is as follows: the volume ratio of gas to liquid is 0.4: 1-1: 1 under an injection pressure. The foam system, provided by the invention, has super strong foam performance and ultra-low interface tension. The foam profile control effect is remarkable after polymer flooding, the yield is improved for more than 20%, and the economic benefit is remarkable.

The invention discloses a low-tension viscosity-reducing oil displacement agent, which is used for common heavy oil reservoirs, has a good viscosity-reducing effect, has good compatibility with formation water, can form ultra-low interfacial tension with crude oil, and is prepared from the following components by weight: 30-50% of an alkyl alcohol polyoxyethylene ether sulfate salt, 15-25% of a nonionic surfactant, 15-25% of an anionic surfactant, 2-5% of an organic solvent, 0.1-3% of sodium chloride, and 5-25% of water. According to the present invention, during the use, the low-tension viscosity-reducing oil displacement agent and the polyacrylamide polymer form the composite oil displacement system, wherein the polyacrylamide polymer can provide effects of water phase viscosity increasing, water-oil mobility ratio reducing, conformance expanding and profile control expanding, and the low-tension viscosity-reducing oil displacement agent can provide effects of oil-water interface tension reducing, oil displacement efficiency improving and crude oil viscosity reducing so as to further improve the water-oil mobility ratio, such that the extraction rate of the common heavy oil reservoir can be substantially improved through the synergetic effect of the polyacrylamide polymer and the low-tension viscosity-reducing oil displacement agent.

The invention discloses a polyamide and amine hybridized nanosilicon dioxide hyperbranched polymer and a preparation method thereof. The preparation method of the polymer comprises the following steps of firstly, modifying the surface of nanosilicon dioxide by using a coupling agent; then, carrying out Michael addition reaction and amidation reaction on the modified nanosilicon dioxide by using ethylenediamine and methyl acrylate; finally, carrying out functional modification by using allyl glycidyl ether to obtain a functional polyamide and amine hybridized nanosilicon dioxide monomer, and initiating polymerization reaction on the functional polyamide and amine hybridized nanosilicon dioxide monomer, acrylamide, acrylic acid and a heat-resistant and salt-tolerant monomer by using a redox initiator or azobis(isobutylamidine) initiator. The hyperbranched polymer has a network structure with a polyamide and amine hybridized nanosilicon dioxide unit as a center, has excellent shear resistance, strong thickening property, heat resistance and salt tolerance, and is wide in adaptability and capable of being used as an oil displacement agent for increasing the recovery rate of raw oil in an oil field environment with a high mineralization degree and a wide temperature range; the preparation method of the polyamide and amine hybridized nanosilicon dioxide hyperbranched polymer is reliable in principle, simple and convenient to operate and wide in application prospect.

The invention relates to cross-linked polymer microsphere for oil displacement of an oilfield and a preparation method for the cross-linked polymer microsphere. The cross-linked polymer microsphere is obtained by polymerization and cross-linking of the components including acrylamide monomers, dendritic functional monomers, cross-linking agent, emulsifier, dispersion media, initiator, deionized water and selectable initiator solvent. The microsphere has good heat stability and injectivity, can be applied to surfactant flooding of an oil reservoir at the temperature as high as 150 DEG C, and is applicable to the zone permeability range from 0.05 to 5000mD. The microsphere can be directly and quickly dispersed after entering a stratum and functions in intelligent blockage. The action mechanism includes that the cross-linked polymer microsphere absorbs water to swell in a water flow passage of a water zone to form a swelling cross-linked polymer aggregate with the grain size ranging from 0.1 to 10 micrometers, and single aggregate or multiple aggregates bridge to block a pore throat of the porous media water flow passage; but in an oil layer, the cross-linked polymer microsphere cannot swell and is difficult to block a flow passage, thereby having an intelligent function of blocking water but not blocking oil.

The invention relates to a core-shell polymer microsphere profile control and oil displacement agent for oil reservoir profile control and displacement and increase of water drive recovery factor and a preparation method of the core-shell polymer microsphere profile control and oil displacement agent, which can solve the technical problems of difficulty in injection and poor temperature resistance and salt resistance. The invention adopts a technical scheme as follows: the profile control and oil displacement agent is made from the following raw materials in parts: 15 to 20 of a hydrophobic monomer (such as styrene or a styrene derivative or an acrylate ester), 2 to 10 of a hydrophilic monomer (such as acrylic acid or an acrylate salt or acrylamide), 60 to 85 of deionized water, divinylbenzene as core-phase cross-linking agent, N,N'-methylene-bis-acrylamide as shell-phase cross-linking agent, and a sulfate salt as initiator. The method comprises the following steps of: adding the shell-phase cross-linking agent and acrylic acid into a three-necked flask with water, adding the core-phase cross-linking agent and styrene after dissolving completely, introducing nitrogen gas (30 DEG Cto 75 DEG C), adding the initiator, and allowing reactions to take place for 6 to 8 hours under stirring, to obtain the polymer microsphere profile control and oil displacement agent. The polymer microsphere profile control and oil displacement agent is suitable for middle/low-permeability oil reservoirs, can be applied to high-permeability oil reservoirs in combination with other profile controlagents, and can greatly increase the crude oil recovery ratio.

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.