77results about How to "Reduce water injection pressure" patented technology

The invention relates to a nano material-based water-based oil field injection agent and a preparation method thereof. The injection agent consists of 20 to 60 weight percent of diesel oil, 30 to 70 weight percent of surfactant, 1 to 10 weight percent of nano material and 1 to 20 weight percent of auxiliary agent, wherein the nano material is one or more of nano silicon dioxide, nano titanium oxide, nano magnesium oxide and nano aluminum oxide after surface modification. The preparation method thereof comprises the following steps that: firstly, weighing the diesel oil in proportion; secondly, adding the nano material in the diesel oil; thirdly, emulsifying and dispersing the mixture in an emulsifying machine; fourthly, adding the surfactant and the auxiliary agent into the emulsified and dispersed mixture; and finally, mechanically stirring to disperse the mixture at room temperature or in a water bath to obtain stock solution of the nano water-based injection agent. The injection agent can be mixed with water at any proportion to obtain homogeneous emulsified dispersion. After the emulsified dispersion is injected in the oil field through a specific process, the water injection pressure can be obviously reduced, the amount of water injection can be increased and the oil production efficiency can be improved so as to achieve the purpose of energy conservation and injection increase.

The present invention relates to a nano liquid for decompression and augmented injection of tight oil water-flooding, and a preparation method and application thereof. The nano liquid for decompression and augmented injection is composed of 0.1-1% of hydrophobic nano-silica, 0.3-3% of a dispersant, 0.2-1% of a dispersing aid and the balance of water. The hydrophobic nano-silica has particle size between 12-22 nm, and median diameter between 16-18 nm; and the hydrophobic nano-silica is prepared from fumed nano silica and an organic silicon compound by a wet modification method. The dispersant is octylphenyl polyoxyethylene ether, polyethylene glycol 400, polyethylene glycol 600 or glycerin. The dispersing aid is NaOH, Na2SiO3 or n-butanol. The nano liquid for decompression and augmented injection employs water base dispersion and has the advantages of environment-friendliness, simple preparation and good stability. Under the action of stratum water salt ions, the hydrophobic nano-silica is adsorbed on the surface of the rock, so that wetting conversion generates on the rock surface to produce hydrophobic slip effect and reduce flow resistance and injection pressure.

The invention belongs to the technical field of oil and gas fieldchemistry and discloses a decompression and augmented injection agent for a water injection well of a low-permeability reservoir. The decompression and augmented injection agent comprises the following components by weight percent: 30%-35% of bisoctyl dimethyl ammonium chloride, 3%-7% of a fluorocarbon surfactant, 3%-5% of a non-ionic surface active agent, 5%-10% of ethylene diamine tetra (methylene phosphonic acid) sodium, 2%-5% of dimethyl ketoxime and 38-57% of water. The invention also provides a preparation method for the decompression and augmented injection agent. The decompression and augmented injection agent takes water solution as a transmitting medium and forms an ultrathin molecular film by depositing on the rock surface; the decompression and augmented injection agent has a function of changing the core wettability and clay anti-swelling property; the decompression and augmented injection agent also has multiple effects of corrosion inhibition, scale inhibition, sterilization, and the like, can effectively prevent the influence on the formation porosity caused by injected water corrosion products, scaling, bacteria, and the like, and can greatly promote the water injection effect of the water injection well of the low permeability reservoir. Being as a novel decompression and augmented injection agent with excellent decompression and augmented injection effects, the decompression and augmented injection agent has wide market prospect.

The invention relates to an oilfield water-injection injection augmentation agent and in particular relates to a nano-solution for decompression and injection augmentation of ultra-low permeability oil reservoir water-flooding development and a preparation method of the nano-solution. The nano-solution for the decompression and injection augmentation is prepared from double-radical modified nano silicon dioxide grains and a NaOH water solution, wherein the double-radical modified nano silicon dioxide grains are commonly modified by alkyl and alkyl acid. The nano-solution for the decompression and injection augmentation is simple in preparation, uniform in dispersion and good in stability. After the nano-solution is injected into a stratum, the double-radical modified nano silicon dioxide grains are attached on surfaces of reservoir rocks; hydration films on the surfaces of the rocks are stripped to form nano adsorption layers; with the pH (Potential of Hydrogen) in a stratum water environment becomes neutral from alkaline, the surfaces of the rocks become wet, so that a lyophobic slippage effect is generated and the aims of reducing water flow resistance and injection pressure are realized.

The invention discloses a multi-hydrogen acid construction process suitable for modification of a sandstone reservoir. The multi-hydrogen acid construction process suitable for modification of the sandstone reservoir successively comprises the following steps: step one, carrying out replacing on 10-20 m<3> of a pre-treating solution or a mutual solvent under the conditions that the discharge capacity is 0.1-0.5 m<3>/min, and the pump pressure is 1-34 MPa; step two, carrying out extrusion on 10-20 m<3> of pad-acid under the conditions that the discharge capacity is 0.1-0.5 m<3>/min, and the pump pressure is 1-34 MPa; step three, carrying out extrusion on 20-50 m<3> of main body acid under the conditions that the discharge capacity is 0.1-0.5 m<3>/min, and the pump pressure is 1-34 MPa; andstep four, carrying out extrusion on 5-20 m<3> of water well displacing liquid or oil well displacing liquid under the conditions that the discharge capacity is 0.2-1 m<3>/min and the pump pressure is1-34 MPa to finish acidification modification on the sandstone reservoir under a water well or an oil well. The multi-hydrogen acid construction process suitable for modification of the sandstone reservoir is used for carrying out augmented injection on an acidized horizon, blockage of a pore throat channel of a stratum is relieved, the water injection amount is increased, water injection pressure is reduced, the oil and gas recovery efficiency is improved, and compared with a conventional acidifying process, the multi-hydrogen acid construction process suitable for modification of the sandstone reservoir is more environmentally friendly and safer, and provides a safe operation condition for human beings, equipment and environments.

The invention discloses a plug removal agent for an oil-water well of a tight oil reservoir. The plug removal agent is prepared from the following components in percentage by mass: 8.0 to 15.0 percent of organic sulfonic acid, 5.0 to 8.0 percent of organic carboxylic acid, 0.5 to 1.5 percent of hydrofluoric acid, 3.0 to 12.0 percent of fluoroboric acid, 0.5 to 1.5 percent of mutual solvent, 0.5 to 1.0 percent of wetting reversion agent, 5.0 to 10.0 percent of chelating agent, 0.5 to 1.5 percent of clay stabilizer, and the balance of water. According to the plug removal agent disclosed by the invention, the problem that the tight oil reservoir is easily plugged by primary particles and secondary particles due to high mud content, poor reservoir physical property and small pore throat radius is solved, the reservoir permeability is recovered and improved to the maximum extent, the percolation capacity of a stratum with actual control radius of the oil-water well is improved, and the aims of improving the production capacity of the oil-water well, and realizing enhanced production of an oil well and intensified injection of a water well are achieved.

The invention discloses a water injection well decompression and injection-augmentation agent containing biosurfactant, and relates to the technical field of oil exploitation auxiliaries. The water injection well decompression and injection-augmentation agent containing the biosurfactant is prepared from, by weight, 62-71 parts of lipopeptide biosurfactant, 22-31 parts of ampholytic surfactant, 3-5 parts of solubilizing assistant, 3-5 parts of clay stabilizer and 2-4 parts of scale inhibitor. According to the water injection well decompression and injection-augmentation agent containing the biosurfactant, wettability can be changed, oil-water interfacial tension is lowered to 10<-3> mN/m, in this way, starting of residual oil is facilitated, the phenomenon that the decompression and injection-augmentation agent causes emulsification to crude oil, so that water injection pressure rises can be avoided, the water injection well water injection pressure is effectively lowered, and the under injection well water injection capacity is improved; meanwhile, clay swelling can be prevented, and damage of carbonate precipitation such as calcium carbonate to stratum can be inhibited; the lipopeptide biosurfactant is adopted as the biosurfactant, and the water injection well decompression and injection-augmentation agent has the advantages of being environmentally friendly, low in dosage, good in water solubility, low in price and the like.

The invention relates to pseudomonas aeruginosa YM4 CGMCC No.5243, and a culture method and application thereof. The culture method for the pseudomonas aeruginosa YM4 comprises the following steps: inoculating the pseudomonas aeruginosa YM4 into a fermentation culture medium; and cultivating in a shaking table at the temperature of 35 or 55 DEG C and at the rotating speed of 120 or 80 rpm, wherein the formula of the fermentation culture medium comprises glucose, peptone, corn paste, sodium nitrate, disodium hydrogen phosphate, potassium dihydrogen phosphate, magnesium sulfate and calcium chloride, and the pH value of the fermentation culture medium is 6.5 to 7.4. A biological surfactant generated by the pseudomonas aeruginosa YM4 can reduce oil water interface tension in the oil field; and after the action, the rheological property of the crude oil is obviously improved, viscosity is reduced, water injection pressure can be effectively reduced, water injection efficiency and recovery ratio of the crude oil can be improved; and large application prospect is achieved in the oil displacement process of the oil field.

The present invention provides a scale remover used for long-acting pressure decrease and injection increase of a water injection well, and the scale remover comprises the following components: 10-12 parts of Tween 80; 25-30 parts of 2-Phosphonobutane-1,2,4-tricarboxylic acid; 5-8 parts of dodecylbenzene sulfonic acid; 3-6 parts of an organosilicon surfactant; 2-5 parts of ethylene glycol butyl ether; 15-18 parts of n-butanol; 13-15 parts of polyamino polyether methylene phosphate and 12-14 parts of water. The scale remover has good anti swelling and swelling shrinkage capability and low surface and interface tension, and the scale remover reduces deformation work when liquid droplets pass through a narrow hole neck, reduces capillary resistance, greatly reduces the deformation work when the liquid droplets in a pore medium are pulled to spread on the surface of a rock so as to increase the moving speed of the liquid droplets in formation pores. After being injected into formation, the scale remover reduces the interfacial tension, meanwhile can restore an original water channel, reduce water injection pressure and improve water injection amount by dissolution of calcium carbonate, calcium sulfate and other precipitates near a wellbore area so as to ensure that the original water injection system is normal.

The invention provides an oilfield water injection device. The device comprises a dosing pot, a dosing pump, and a water injection pump. The dosing pot comprises a dosing inlet and an outlet. The outlet of the dosing pot is communicated with the inlet of the dosing pump. The dosing pump is a diaphragm metering pump. The inlet of the water injection pump is communicated with the water outlet pipe of a water injection station. The outlet of the water injection pump is connected with a first outlet of the dosing pump and is communicated with the water injection pipe of a water injection well. The dosing pump also comprises a second outlet. The second outlet is communicated with the inlet of the dosing pot through a reflux pipeline. The oilfield water injection device can improve water injection pressure to achieve an objective of water injection well stimulation, and realizes to fill medicament on line to dredge reservoir blocking, and improves water absorption capacity of a water injection well. Correspondingly, after a stratum is dredged, water injection pressure is reduced, so just short-term high-pressure water injection is needed, and damages of a water injection pipeline and a stratum caused by long-term high-pressure water injection.

The invention discloses a method for reducing pressure and increasing injection through a gemini surfactant. The method comprises orderly injecting hydrochloric acid containing an additive, mud acid containing an additive and a gemini surfactant solution into the middle of an oil layer, then injecting water into the oil layer to eject the agents to the stratum after the gemini surfactant is injected, and after well completion, injecting water, wherein the mud acid use amount of each meter of the oil layer is 0.5-2 m<3>, the hydrochloric acid use amount of each meter of the oil layer is 0.8-1.2times the mud acid use amount of each meter of the oil layer, the gemini surfactant use amount of each meter of the oil layer is 4-8 m<3>, the gemini surfactant solution is an ethyldidodecylammoniumphosphate solution and has a concentration of 5.0% to 7.5%. The gemini surfactant realizes pressure reduction and injection increasing of a low-permeability reservoir water injection well and has an effective period longer than the conventional acidification measure. The method can utilizes a water injection pipe column for construction, is free of acid solution returning, orderly injects agents,has simple processes, is easy to operate, has a short construction period and has large economic effects.

The invention discloses an anti-swelling shrinking agent which comprises, by weight, 15.7-64.68 parts of tertiary amine, 6-13.3 parts of epoxy chloropropane, 5-13.5 parts of hydrochloric acid and 12-32 parts of organic solvents. The tertiary amine, the epoxy chloropropane and the hydrochloric acid react in the organic solvents to generate long-chain quaternary ammonium salt with good surface activity. By electrostatic interaction, the long-chain quaternary ammonium salt with positive charge is easily adsorbed on the surfaces of clay particles with negative charge, crystal layer repulsion of the clay particles is reduced, the clay particles can be separated from water molecules, and continued hydrous swelling of the clay particles is inhibited. Surplus positive charge continues to be adsorbed on the surfaces of the clay particles, double electric layers are compressed by electrostatic repulsion, the distance between clay layers is shortened, and the anti-swelling shrinking agent has shrinking effects. The anti-swelling shrinking agent has anti-swelling and shrinking functions and further has surface activity. The invention further provides a preparation method of the anti-swelling shrinking agent.

The invention relates to a single-well parallel crack water injection and oil extraction method of an offshore low-permeability reservoir. A single well at least consists of a main well hole, and two oil extraction branches, a water injection branch and a set of parallel manual cracks positioned in a reservoir, wherein the oil extraction branches and the water injection branch are horizontal wells, and extend along a maximum main stress direction of a stratum; the water injection branch is positioned between the two oil extraction branches; the water injection branch and the oil extraction branches are subjected to the staged fracturing operation to generate the manual cracks parallel to shafts; the water injection operation is performed by the water injection branch positioned between the two oil extraction branches; and injected water diffuses along crack surfaces and enters the stratum after entering the manual cracks. The method has prominent effects on increment of the controlled reserve, reduction of the cost and improvement of the development effect in the development of the offshore low-permeability reservoir.

The invention relates to a slow blocking remover for a deep part of an oil and water well. The slow blocking remover comprises following components by weight: 1.5-2.0% of sodium dodecyl benzene sulfonate, 5.5-7.5% of ethylene diamine tetra (methylene phosphonic acid) sodium, 20.0-25.5% of diethylenetriam inepentaacetate, 15.5-17.5% of methanesulfonic acid, 0.5-1% of sodium acetate, and the balance water. The blocking remover not only can remove scaling and blocking of near-wellbore, but also can remove scaling and blocking of the deep part of stratum, and finally reaches purposes of yield increase of the oil well and injection increase of a water injection well.

The invention provides an environment-friendly pressure-reducing injection-increasing multi-twin active agent and a preparation method thereof, wherein the environment-friendly pressure-reducing injection-increasing multi-twin active agent comprises, by mass, 0.01-0.5% of a polyoxyethylene copolymer resin, 2-45% of dimethyl diallyl ammonium chloride, 5-20% of an organic guanidine compound, 4-16% of a quaternary ammonium salt, 0.1-0.6% of a pH regulator, 0.1-0.6% of a cloud point regulator, and the balance of water. According to the invention, with the environment-friendly pressure-reducing injection-increasing multi-twin active agent, the hydrated expansive clay in stratum becomes insensitive when contacting the injected water, or the reservoir with low permeability expands reversely whilethe resistance of the injected water is substantially reduced, so that the pressure-reducing injection-increasing and plugging release of oil and gas field water injection wells is achieved.