Blockage remover for decompression and steam injection in high clay content sandstone oil reservoir

Abstract

The invention relates to a blockage remover for decompression and steam injection in a high clay content sandstone oil reservoir. The blockage remover consists of organic blockage remover and subject inorganic blockage corrosion agent. By adopting the blockage remover provided by the invention, blockage removal in deep sandstone reservoir stratum with high clay content, loosen cementation and low penetration can be realized, the penetration rate in an acidification band is improved to the maximum degree, the pressure of steam injection is reduced, and the quality of steam injection is improved.

Description

technical field [0001] The invention relates to a plug-removing agent for steam injection in sandstone reservoirs with high clay content and belongs to the field of petroleum exploitation. Background technique [0002] At present, heavy oil blocks in some oilfields are sandstone reservoirs with high clay content, and the development method is steam stimulation. Affected by factors such as poor reservoir physical properties, high clay content, and loose cementation of the reservoir, the steam injection pressure is as high as 20MPa during steam huff and puff, and the steam dryness at the wellhead is 0, making steam injection difficult; due to poor steam injection quality, formation crude oil cannot be obtained Effective heating to reduce viscosity, oil wells have poor liquid supply capacity and weak recovery capacity after switching from injection to pumping. However, when conventional acidizing technology is applied to sandstone reservoirs with high clay content and loose cem...

AI Technical Summary

Problems solved by technology

Affected by factors such as poor reservoir physical properties, high clay content, and loose cementation of the reservoir, the steam injection pressure is as high as 20MPa during steam huff and puff, and the steam dryness at the wellhead is 0, making steam injection difficult; due to poor steam injection quality, formation crude oil cannot be obtained Effective heating and viscosity reduction, poor liquid supply ability and weak recovery ability after injection and pumping, while conventional acidizing technology is not effective when applied to sandstone reservoirs with high clay content and loose cementation

[0003] Constrained by the above problems, the oil wells in the block have problems such as low production capacity, resulting in some low-yield wells being shut down or changed to oil production, and the development effect of the block is poor

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