A high-pressure under-injection well dense single-layer segmentation treatment method and treatment device

Abstract

The invention discloses a high-pressure under-injection well dense single-layer segmentation treatment method and treatment device, including a construction pipe string, and two packers arranged at the lower end of the pipe string, and a ball valve is arranged at the lower end of the pipe string. In the process, the oil layer is divided into several sections, and the blockage removal fluid is used to remove the blockage step by step from bottom to top. Firstly, the front fluid and the plugging solution are injected through the ball valve to remove the plugging of the lowermost oil layer, and then through the two packers. Repeat the sealing of the annulus area of ​​the sleeve corresponding to each oil layer section in the upper layer, and inject the unblocking fluid through the pressure valve to unblock the oil section until the unblocking of each oil section is completed. This method can prevent the unplugging fluid from Flow, local treatment, to ensure that the oil layer is fully treated vertically and horizontally, and blockage can be effectively removed. After treatment by this method, the effect of the measure can be extended for a long time, and at the same time, the water injection profile can be effectively improved, and the water flooding efficiency can be improved.

Description

Technical field [0001] The present invention relates to the field of oil and gas exploitation, specifically a high-pressure under-injection well tight single-layer segmented treatment method and treatment device. Background [0002] At present, in the oilfield production work, when the injection well is betting, the perforation degree of the perforation section of the oil layer reaches 80%, and the permeability of the oil layer section in the longitudinal direction is large, and there are cracks, micro-fractures, micro-fractures and narrow hyper-permeability compartments in the local area, resulting in the injection of water first injected along these local high permeability channels, but with the extension of the water injection time, due to the encounter between the injected water and the formation water will produce scale, the injection water and the water injection pipe contact will produce corrosion products, coupled with the transport particles produced by clay minerals and...

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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 provides a high-pressure under-injection well dense single-layer segmental treatment method and treatment device, which can effectively relieve blockage and prolong solution to the maximum extent. Block time

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