Method for adjusting well group after lot of oil-displacing fluid is injected into thin oil reservoir water injection well of sandstone reservoir

Abstract

The invention relates to a method for adjusting a well group after a lot of oil-displacing fluid is injected into a thin oil reservoir water injection well of a sandstone reservoir. The problem is mainly solved that an existing conventional fracturing well group adjusting method is not suitable for adjusting a measure well group by using the technology that a lot of oil-displacing fluid is injected into the water injection well. The method is characterized by comprising the steps that (1), water-injection profiles of measure wells obtained after a lot of oil-displacing fluid is injected are well monitored periodically, the production profiles of connected oil wells of the measure wells are well monitored periodically, and the measure wells are subjected to subdivision and water lifting; (2), the future production status of the connected oil wells is subjected to numerical simulation tracking and scheme prediction; a normally-closed oil well is subjected to well opening control; a high-flowing-pressure connected oil well is subjected to adjustment of large parameters and changing of a high-capacity pump; a non-measure water injection well is subjected to scheme adjustment; breakthrough layers of the connected oil wells and the connected wells with the breakthrough layers displayed by monitoring data are subjected to water plugging; the connected oil well with the low-permeability oil layer displayed by the monitoring data is subjected to fracturing response. By means of the adjusting method, the oil production speed and the recovery percent of the thin oil reservoir well group are increased.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a well group adjustment method after a large dose of oil displacement fluid is injected into a water injection well in a sandstone oil reservoir with a thin poor oil layer. Background technique [0002] At present, the similar technology is the well group adjustment method of conventional fracturing. Since the fracturing radius of this conventional fracturing measure is small, it is mainly aimed at enhancing communication and removing oil layer pollution after thick oil layer measures. The new technology of injecting large doses of oil displacement fluid through water injection wells has a large fracturing radius, far exceeding that of ordinary fracturing. It can establish effective connectivity in thin and poor oil layers, improve the injection capacity of water injection wells, and have better oil displacement effects. Moreover, compared with conventional fracturi...

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Problems solved by technology

[0003] The present invention aims to overcome the problem that the existing conventional fracturing well group adjustment method in the background technology is not suitable for the well group adjustment of the technology of injecting large doses of oil displacement fluid into the water injection well, and provides a thin poor oil layer injection method for sandstone reservoirs. Adjustment Method of Well Group After Injecting Large Dose of Displacing Fluid into Water Well

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