Method for improving recovery efficiency of complex fault block high-saturation sandstone reservoir

Abstract

The invention provides a method for improving the recovery efficiency of a complex fault block high-saturation sandstone reservoir, and belongs to the field of oil and gas reservoir development. The method comprises the steps that a plurality of high-saturation sandstone reservoirs are selected from the complex fault block sandstone reservoir; one high-saturation sandstone reservoir is screened out from the multiple high-saturation sandstone reservoirs through a weighted value matrix method; a gas injection well is screened out from the screened high-saturation sandstone reservoir to serve as an operation well; and oxygen injection and reduction air drive is conducted on the operation well. According to the method, the complex fault block oil recovery speed can be obviously increased, the recoverable reserve is increased, the recovery efficiency is improved, and the development effect of the complex fault block high-saturation sandstone reservoir is effectively improved.

Description

technical field [0001] The disclosure relates to the field of oil and gas reservoir development, in particular to a method for improving the recovery rate of complex fault block highly saturated sandstone reservoirs. Background technique [0002] There are various types of oil and gas reservoirs in my country. Compared with foreign countries, the faults are more fragmented, the scale of oil reservoirs is small, and the proportion of low-permeability oil reservoirs is large. Especially in North China, faults are developed, oil and gas reservoirs are of various types, and there are geological reserves and recovery. The "three lows" problems of low oil production rate, low oil recovery rate and low ultimate recovery factor. [0003] Currently, waterflooding is usually used to enhance oil recovery. However, for fault blocks with a lot of dissolved gas and high saturation pressure, although water flooding has a certain natural production capacity at the initial stage, as the pres...

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Problems solved by technology

However, for fault blocks with a lot of dissolved gas and high saturation pressure, although water flooding has a certain natural production capacity at the initial stage, as the pressure drops, the recovery effect will become worse and worse, and water channeling or inefficiency often occurs. Therefore, the potential of highly saturated sandstone reservoirs in fault blocks cannot be fully utilized

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