41results about How to "Increase formation energy" patented technology

The invention discloses a blocking remover for hypotonic inhomogeneous sandstone reservoir and a using method of the blocking remover. The blocking remover comprises an agent A, an agent B and an agent C, wherein the agent A consists of the following components in percentage by weight: 10%-25% of oxidant, 8%-12% of activator and the balance of water; the agent B consists of 10%-15% of a reducing agent, 0.3%-1.2% of a foaming agent, 0.3%-0.6% of a foam stabilizer, and the balance of water; the agent C consists of 8%-12% of HCL, 6%-10% of organic acid, 2%-5% of NH4HF2, 0.5%-1.5% of a corrosion inhibitor, 0.5%-1.5% of an iron ion stabilizer and the balance of water. The using method comprises the steps of step one, preparing the agent A, the agent B and the agent C; and step two, injecting the agent A into a ground layer by a pipeline, then injecting the agent B into the ground layer, and finally injecting the agent C into the ground layer. The blocking remover disclosed by the invention has beneficial effects that the blocking remover disclosed by the invention can be applied to decompression and augmented injection of a water injecting well and deep unblocking of an oil well; and the blocking remover has better effect while being applied to augmented injection of the water well in a reservoir non-homogeneous oil-field block.

The invention provides a technology method for comprehensive oil production and in-situ improvement of super heavy oil, oil shale, kerogen and medium and low-maturity shale oil reservoirs. The technology method is characterized in that a novel shaft electric heating in-situ cracking improvement technology is adopted, and is assisted by an air injection technology; by drilling a production well group into an oil bearing reservoir or adjusting the existing well network, a heating well, an air injection well and a production well are reasonably arranged; air is injected into the reservoir, and a heating cable in a heating well shaft is connected with an electric heating bar to heat the oil bearing reservoir, so as to realize the improvement of underground cracking of crude oil. The technology method has the advantages that by combining the advantages of shaft electric heating and air injection technologies, the problems of single heat transfer type, insufficient driving energy and the like in a single shaft electric heating mode are solved; by utilizing the heat effect of crude oil and oil oxidizing reaction, the stratum temperature is increased, the cracking temperature of the crude oil is decreased, the reaction rate of in-situ cracking is accelerated, the recovery efficient of the crude oil is improved, and the consumption of water resources and carbon emission are decreased.

The present invention discloses an acidizing plugging removal method which comprises steps of: injecting liquid gas as energy increased slug into target layer before traditional acidification process, the liquid gas is liquid nitrogen or liquid carbon dioxide, the injection rate is 1-1.5 stere each meter oil layer, optimal selection is 1.2 stere, the injection speed is 100-250L / min, optimal selection is 200L / min. The method of present invention can relieve zone blocking, improve yield of oil well, successful rate of plugging removal is above 98%, the average base increase production of single well is above 1.5ton / day.

The invention provides a steam huff and puff exploitation method. The method comprises the following steps: selecting a well network of a closed horizontal well as an injection and exploitation well network; injecting non-condensed non-hydrocarbon gas into the injection and exploitation well network, wherein the injection amount is calculated according to the following formula: Q=AV / T, wherein Q is a ground injection amount of the non-condensed non-hydrocarbon gas, the unit of Q is m<3>, V is a ground layer voidage volume, the unit of V is m<3>, A is 9669, T is a ground layer temperature, and the unit of T is K; continuously injecting high-temperature steam into the injection and exploitation well network; carrying out a huff and puff production process, and carrying out sleeve gas monitoring in the production process; when the content of injected gas is raised to 70%-100%, closing a well for 6-12 hours; after a gas-liquid interface is recovered, opening the well to produce. The steam huff and puff exploitation method provided by the invention can be used for steam huff and puff exploitation of heavy oil reservoirs, and the steam huff and puff exploitation effect of the heavy oil reservoirs can be effectively improved.

The invention provides a steam-carbon dioxide assisted gravity oil drainage oil production method, which comprises the following steps of: 1, preheating two horizontal wells in parallel distribution; 2, injecting steam into the upper part horizontal well, and maintaining the original formation pressure in the lower part horizontal well for production; 3, simultaneously injecting the steam and carbon dioxide into an oil layer through the upper part horizontal well, and maintaining the original formation pressure in the lower part horizontal well for production; and 4, stopping the carbon dioxide injection, continuously injecting the steam into the upper part horizontal well, and continuously performing production in the lower part horizontal well. The steam-carbon dioxide assisted gravity oil drainage oil production method has the advantage that through a steam assisted gravity oil discharge technology for reducing the crude oil viscosity, reducing the shaft heat loss and improving the steam enthalpy through adding the carbon dioxide, the recovery ratio of a super-heavy oil reservoir can be improved.

The invention discloses self energy generating type clean fracturing fluid which is prepared from the following raw materials in weight percentage: 1.5% to 5.5% of C12 to C22 quaternary ammonium saltcationic surface active agent, 0.25% to 0.70% of salicylic acid, 1.0% to 4.0% of chloride, 2.0% to 4.5% of carbon dioxide releasing agent and the balance of water, when the chloride is potassium chloride and / or ammonium chloride, and the carbon dioxide releasing agent is sodium carbonate or sodium bicarbonate. In addition, the invention further discloses a preparation method of the fracturing fluid. Compared with existing clean fracturing fluid, preparation cost of the self energy generating type clean fracturing fluid is remarkably reduced; the raw materials react to generate a micelle accelerant and release a lot of CO2 gas at the same time to form gel foam, and the gel foam has the performance characteristics of the foam fracturing fluid; meanwhile, stratum energy is increased, and flowback of gel breaking fluid is facilitated; the fracturing fluid has no residue and low harm and is especially suitable for fracturing increasing and production increasing of low-pressure, low-permeation and low-temperature oil gas.

The invention provides an ultralow interfacial tension self-assembly carbon dioxide foam oil displacement agent suitable for a low-permeability reservoir. The oil displacement agent is prepared from the following components in percentage by weight: 0.2-0.3% of {bis [N-methyl-N-(3-dodecyloxy-2-hydroxyl) propyl-N-(2-hydroxy-3-sodium sulfonate) propyl] ammonium chloride} ethane, 0.2-0.3% of cocamidopropyl betaine, 0.2-0.3% of sodium dodecyl benzene sulfonate and the balance of water. The cleaning agent is prepared from the following components in percentage by weight: 0.1 to 0.35 percent of dodecyl dimethyl amine oxide, 0.02 to 0.07 percent of sodium salicylate, 0.04 to 0.14 percent of chelating agent, 5 to 7 percent of inorganic salt and the balance of water. The invention also provides a preparation method and application of the self-assembled carbon dioxide foam oil-displacing agent with ultralow interfacial tension. The self-assembled carbon dioxide foam oil-displacing agent is good in salt resistance and acid resistance and high in foaming liquid viscosity, enables oil-water interfacial tension to reach 10 <-3 > mN / m order of magnitude and below, generates fine and rich foam, is good in stability, is good in injectability in a low-permeability reservoir, and can improve the oil-water mobility ratio, remarkably increase the sweep efficiency, reduce the oil-water interfacial tension and remarkably improve the oil washing efficiency; the foaming agent does not generate a salting-out phenomenon, and does not generate chemical reaction with calcium and magnesium ions to generate precipitates.

The invention relates to the technical field of fracturing fluid used in a compression fracture yield increasing process of an oil well or a natural gas well, in particular relating to super guar gum foamed fracturing fluid injected with liquid nitrogen for a low-permeability gas reservoir. The preparation method of the super guar gum foamed fracturing fluid comprises the following steps: homogeneously mixing a base solution with a crosslinking solution to obtain a semi-finished product of the super guar gum foamed fracturing fluid; and adding a viscosity breaking agent and injecting liquid nitrogen into the semi-finished product to obtain the super guar gum foamed fracturing fluid injected with liquid nitrogen for on-site construction. The super guar gum foamed fracturing fluid provided by the invention has the advantages of good swelling capacity, stable nature of foam, low content of fracturing fluid residue and good viscosity breaking performance, and can be used for reducing the damage to reservoir bed, increasing the strata energy after fracturing, and improving the flowback efficiency.

The invention provides a staged fracturing transformation process for increasing the single well yield of an ultra-low permeability reservoir horizontal well. The staged fracturing transformation process comprises the steps that according to the characteristics that natural cracks in an ultra-low permeability reservoir are not developed and artificial cracks are single cracks, the fracturing construction displacement is determined to be 3-4 m<3> / min, and then fracturing is conducted through a continuous tubing fracturing pipe string. The traditional technical idea of staged multi-cluster volume fracturing of the ultra-low permeability horizontal well is changed, meanwhile, the intra-segment double-cluster mode in the past is changed into the intra-segment single-cluster mode, the single-segment transformation scale is lowered, the operation cost is lowered, and the transformation pertinence is improved; the segment separation distance is decreased from 80-100 m under 6 m<3> / min volumefracturing in the past into 40-50 m under 4 m<3> / min fracturing, and through dense seam laying and increasing of the number of fracturing transformation segments, the contact area of the hydraulic cracks and the reservoir is greatly increased; and through the matched continuous tubing operation technology, inter-segment fracturing liquid is not sprayed, on the basis of improving the construction efficiency, the formation energy is increased, and yield decreasing is delayed.

The invention provides a composite fracturing method for liquefied petroleum gas (LPG)-carbon dioxide capacity increasing without water. The composite fracturing method comprises the following steps that LPG fracturing fluid is injected into a stratum, and injecting is stopped after a period of time; liquid carbon dioxide fracturing fluid is injected, and injecting is stopped after a period of time; the liquid carbon dioxide fracturing fluid carrying a propping agent is injected, and injecting is stopped after a period of time; and finally, the LPG fracturing fluid carrying the propping agentis injected, and injecting is stopped after a period of time. According to the composite fracturing method for LPG-carbon dioxide capacity increasing without the water, by injecting the different fracturing fluids at all injecting stages and reasonably utilizing the special properties of the different fracturing fluids, the effect of generating a fracture network is achieved, the oil-gas migrationcapacity of a fracture is improved, a vertical and horizontal 'netted fracture' system taking a main fracture as a main is formed, the well control area is increased, energy of the stratum is improved, the reservoir seepage characteristics are improved, the composite fracturing method is especially suitable for reservoirs with low permeability, compactness and high water sensitivity, the productivity after fracturing of a single well can be improved, and the problem that the low-permeability and compact reservoirs are poor in fracturing and reconstruction effect is solved.

The invention belongs to the technical field of oil and gas development, and relates to a construction tool and a method for improving the recovery rate of a horizontal well in a low-permeability oil reservoir. A construction tool and method for improving the recovery rate of a horizontal well in a low-permeability oil reservoir, comprising a pipe string, the pipe string includes an outer wall and an inner wall; a drill bit is connected to the lower end of the pipe string; The upper slider, the sliding sleeve spring and the ball seat; the upper slider and the sliding sleeve spring are located in the closed space formed by the outer wall and the inner wall; the upper part of the upper slider and the outer wall form a cavity, the middle part is provided with sliding holes, and the lower part is connected to the sliding sleeve spring; the lower contact block and the packer rubber sleeve are arranged outside the pipe string, the lower contact block is located in the cavity, the packer rubber sleeve is connected with the contact block and is located at the corresponding position outside the pipe string; Has fixed eyelets; also includes an outer lightweight ball. The invention improves the overall production degree and recovery rate of the low-permeability oil reservoir.

The invention discloses a viscosity-reducing and cleanup composition for thickened oil, and a viscosity-reducing and cleanup additive and a preparation method and application thereof, belonging to the technical field of oil exploitation. The viscosity-reducing and cleanup composition comprises, by mass, 0.1 to 2 parts of a fluorocarbon surfactant, 0.5 to 1 part of a hydrocarbon surfactant, 0.25 to 1 part of an auxiliary agent and 0.05 to 0.3 part of the cleanup additive, wherein the fluorocarbon surfactant is one or more selected from a group consisting of FC-01, FC-02, FC-04-1, FC-06, FC-08 and FC-11; the hydrocarbon surfactant is one or more selected from a group consisting of sodium alpha-olefin sulfonate, SYHSY, SDBS and YN; and the cleanup additive is one or more selected from a group consisting of F370, F633 and SH6. The viscosity-reducing and cleanup composition has low surface and interfacial tension, can effectively reduce the dynamic viscosity of thickened oil, improves surface wettability of a rock core and enhances water recovery rate.

The invention provides a gel composition and a nitrogen-foamed gel composite temporary plugging agent containing the same. The gel composition comprises the following components in percentage by mass: 1.0% of partially hydrolyzed polyacrylamide, 1.5% of formaldehyde, 0.5% of hydroquinone and the balance of water. The nitrogen-foamed gel composite temporary plugging agent comprises nitrogen and foamed gel, wherein the foamed gel is a mixture of the gel composition and a high-temperature-resistant foaming agent; and the volume ratio of the nitrogen to the foamed gel is (40-60):1. The invention also provides a coupled internal / external swirl foam generator which can be used as a facility for preparing the nitrogen-foamed gel composite temporary plugging agent. The invention also provides a method for inhibiting high-throughput-frequency well steam channeling interference of thick oil, which has the characteristics of small formation damage, strong selectivity for measures and the like and has the effect of gas energization.

The invention discloses a blocking remover for hypotonic inhomogeneous sandstone reservoir and a using method of the blocking remover. The blocking remover comprises an agent A, an agent B and an agent C, wherein the agent A consists of the following components in percentage by weight: 10%-25% of oxidant, 8%-12% of activator and the balance of water; the agent B consists of 10%-15% of a reducing agent, 0.3%-1.2% of a foaming agent, 0.3%-0.6% of a foam stabilizer, and the balance of water; the agent C consists of 8%-12% of HCL, 6%-10% of organic acid, 2%-5% of NH4HF2, 0.5%-1.5% of a corrosion inhibitor, 0.5%-1.5% of an iron ion stabilizer and the balance of water. The using method comprises the steps of step one, preparing the agent A, the agent B and the agent C; and step two, injecting the agent A into a ground layer by a pipeline, then injecting the agent B into the ground layer, and finally injecting the agent C into the ground layer. The blocking remover disclosed by the invention has beneficial effects that the blocking remover disclosed by the invention can be applied to decompression and augmented injection of a water injecting well and deep unblocking of an oil well; and the blocking remover has better effect while being applied to augmented injection of the water well in a reservoir non-homogeneous oil-field block.

The invention provides a low-corrosion self-generating energized fracturing fluid and a preparation method thereof. The fracturing fluid of the present invention is prepared by mixing an air generator solution and an initiator solution; 0.2-1 part of joint agent, 0.02-0.1 part of gel breaker, 0.05-0.2 part of bactericide, 25-43 parts of water; the initiator solution includes the following raw materials in parts by weight: 0.02-0.1 part of drag reducing agent, 3 parts of methyl formate -20 parts, 1.5-10 parts of ammonium chloride, 0.5-1.2 parts of methanol, 21-45 parts of water. The fracturing fluid of the present invention has the characteristics of self-gasification, low corrosion, no reaction or slight reaction at normal temperature, good stability, easy control of reaction, rapid response at formation temperature, full and effective use of fracturing fluid, no harmful gas generation, safety and environmental protection, And it has the advantages of little impact on the reservoir near the wellbore.

The present invention provides a high-efficiency self-generated gas foam fracturing fluid and a construction method. The foam fracturing fluid is composed of a base fluid, a gas-generating fluid and a heat-generating agent, wherein the mass ratio of the base fluid, gas-generating fluid, and heat-generating agent is 100: (30‑42): (5‑9). During construction, the base fluid and the gas-producing fluid are pumped downhole together through the suction of the sand mixing truck according to the mass ratio, and the heat generating agent is pumped into the downhole along with the proppant. The invention does not need liquid nitrogen accompanying injection, simplifies the on-site process and reduces the construction cost, and a large amount of gas generated through the chemical reaction achieves the purpose of increasing the energy of the formation, improving the flow capacity of the reservoir liquid, and increasing the output. It can quickly generate a large amount of inert and safe gas, and will not produce toxic gas of nitrogen oxides, reducing construction risks. At the same time, the alkaline environment generated by the reaction product is conducive to the formation of fracturing fluid gel and the corrosion protection of downhole pipe strings. By generating foam, the Jiamin effect is used to increase the net pressure of the formation, which can quickly flow back, generate heat in the deep formation to promote gel breaking, and reduce the damage of fracturing fluid to the reservoir.

The invention provides a self-assembled ultramicro-foam oil-displacing agent. The self-assembled ultramicro-foam oil-displacing agent contains the following components in percentage by weight: 0.2%-0.3% of 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium carboxylate)-methine]ammonium bromide, 0.2%-0.3% of N-(1-dodecyloxy ether-2-hydroxy)propane-N-dimethyl-N-(2-hydroxy)propanesulfonate, 0.1%-0.35% of an anionic surfactant, 0.02%-0.07% of triethanolamine, 0.02%-0.07% of urea, 0.04%-0.14% of a chelating agent, 5%-7% of inorganic salt and the balance of water. The invention further provides a preparation method and application of the oil-displacing agent. The self-assembled ultramicro-foam oil-displacing agent has the beneficial effects that rich and fine foams are produced, the diameter are 1-20 microns, and the half-life period of the foams is relatively long; and when CO2 is introduced for foaming, the phenomenon that CO2 generate chemical reaction with calcium ions and magnesium ions to generate white precipitated calcium carbonate or magnesium hydroxide is avoided.