Dense single-layer sectional treatment method and treatment device for high-pressure under-injection well

Abstract

The invention discloses a dense single-layer sectional treatment method and a treatment device for a high-pressure under-injection well. The treatment device comprises a construction pipe column and two packers arranged at the lower end of the construction pipe column, and a ball valve is arranged at the lower end of the pipe column; in the treatment process, an oil layer is divided into a plurality of sections, and unblocking is conducted section by section from bottom to top through unblocking liquid; firstly, prepad fluid and the unblocking fluid are injected through the ball valve to unblock the oil layer section on the lowermost layer, then an annulus area of a sleeve corresponding to each oil layer section on the upper layer is repeatedly sealed through two packers, and the unblocking fluid is injected through a pressure valve to unblock the oil layer section until unblocking of each oil layer section is completed. According to the method, the unblocking liquid can be prevented from locally flowing and locally treating, it is ensured that the oil layer is sufficiently treated in the longitudinal and transverse directions, blockage can be removed effectively, the measure effect can be prolonged for a long time after treatment by the method, the water injection profile can be effectively improved, and the water flooding efficiency can be improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a segmented treatment method and a treatment device for a dense single layer of a high-pressure under-injection well. Background technique [0002] At present, in oil field production, when water injection wells are injected, the perforation degree of the perforation section of the oil layer reaches 80%, while the vertical permeability of the oil layer section is quite different, and there are cracks, micro-cracks, micro-cracks and narrow high The existence of the permeable layer causes the injection water to be injected along these local high-permeability channels at first, but as the water injection time prolongs, due to the encounter between the injection water and the formation water, scale will be generated, and the contact between the injection water and the water injection pipe will produce corrosion products, and in the oil layer The migratory particles produced by...

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Problems solved by technology

[0004] Aiming at the problem of repeated injection measures for medium and high-pressure under-injection wells in the prior art, and the effective period of the measures is short, the present invention pro

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