Selective water plugging method for high-water-content oil well of bottom water reservoir
A bottom water reservoir, selective technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of difficult water shutoff and poor water shutoff effect in edge and bottom water reservoirs, and achieve Effects of increasing stability and strength, increasing oil resistance, and strengthening the effect of pressing the cone
Active Publication Date: 2021-10-01
SOUTHWEST PETROLEUM UNIV
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The invention discloses a selective water plugging method for a high-water-content oil well of a bottom water reservoir. The selective water plugging method comprises the following steps of injecting a nitrogen pressure cone into a shaft, injecting a mixed solution of a foaming agent, a polymer solution, a foam stabilizer and a cross-linking agent, and forming gel foam in a stratum. then removing foam in a high-permeability layer through flowback, so that the purposes of temporary plugging of low permeability and enabling a subsequent water plugging agent to directionally enter the high-permeability layer are achieved; then injecting the water plugging agent, and enabling the water plugging agent to build an artificial partition plate at the proper position in a water producing layer, so that bottom water is prevented from moving upwards, and bottom water coning is restrained; and finally, enabling the water plugging agent to be displaced out of a certain position of a near wellbore zone through over-displacement of a polymer solution, so that a certain liquid production capacity after plugging is ensured, the injection pressure of the water injection well is prevented from being too high, and the validity period of the water plugging agent is prolonged. Under the combined action of the steps, directional water plugging is achieved, and the problems that water breakthrough of the oil well is too early, and the yield is sharply reduced after water breakthrough are solved.
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