Oil well plugging, adjustment and washing process

Abstract

The invention relates to a plugging, adjusting and washing process of an oil well. The plugging, regulating and washing process is used for taking enhanced oil recovery measures on a high-water-cut-oil-producing well in oil recovery production and comprises the following procedures that surface active agent first enters a high-permeability part for cleaning remaining oil in the high-permeability part, and then a reverse profile control polymer is injected into the high-permeability part, since the viscosity of the reverse profile control polymer is greater than that of the surface active agent, the reverse profile control polymer drives the surface active agent to migrate to the deep part of a reservoir, and after the oil well resumes production, the reverse profile control polymer migrates along a backflow passage of the surface active agent under the displacement action of injected water to form plugging; then complex water plugging agent is injected for carrying out high-strength plugging on the high-permeability part, the liquid outlet capability of an interval is reduced, and after that cement is used for sealing a near-wellbore area for preventing injected medicament from returning to be poured into a shaft; finally a polymer solution is used for replacing a slug to play an effect on washing the shaft. The displacement efficiency is improved while the high-permeability part in the interval is effectively plugged, remaining oil in the reservoir is fully excavated, the oil ingress potential of a single well is improved, and the recovery rate is improved.

Description

technical field [0001] The invention relates to an oil well plugging, adjustment and washing process used when implementing measures to increase recovery rate of high water-cut oil wells in oil production. Background technique [0002] At present, the treatment measures for high water-cut oil wells mainly adopt composite water shutoff technology, which uses composite water shutoff agent to seal the high water-cut layer of the oil well and reduce the liquid output capacity of the layer, but this technology is only for simple plugging , although it has good plugging performance for high aquifers, it will form a "dead oil zone", and the remaining oil in the layer will still stay in the pores and cannot be displaced in the subsequent production process, so the oil recovery efficiency cannot be improved . Contents of the invention [0003] In order to improve the recovery rate of high water-cut oil wells, the invention provides an oil well plugging, adjustment and washing proc...

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Problems solved by technology

[0002] At present, the treatment measures for high water-cut oil wells mainly adopt composite water shutoff technology, which uses composite water shutoff agent to seal the high water-cut layer of the oil well and reduce the liquid output capacity of the layer, but this technology is only for simple plugging , although it has good plugging performance for high aquifers, it will form a "dead oil zone", and the remaining oil in the layer will still stay in the pores and cannot be displaced in the subsequent production process, so the oil recovery efficiency cannot be improved

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