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

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 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 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.