Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir

Abstract

The invention discloses a blocking system and a blocking method for channeling inhibition in carbon dioxide non-miscible flooding of a low permeability reservoir. The system is mainly prepared from the following raw materials in percentage by weight: 1%-2% of fine mineral particles, 0.2%-0.3% of polymer, 0.01%-0.02% of compound crosslinking agent, 0.04%-0.1% of retarder, 0.01% of deoxidant, 0.1%-0.5% of surfactant and the balance of water. By virtue of monitoring the steam injection pressure of a wellhead in real time and adjusting the system, graded control of high-pressure steam injection, 'gas channeling' and 'escape channeling' processes in the carbon dioxide non-miscible flooding is realized and the development effect of the carbon dioxide non-miscible flooding of the low permeability reservoir is improved.

Description

technical field

[0001] The invention specifically relates to a carbon dioxide immiscible flooding suppression and plugging system and a plugging method for low-permeability oil reservoirs. Background technique

[0002] With the continuous development of conventional oil and gas resources, the replacement of complex oil and gas resources is an important supplement to the world's oil and gas resources, and the development of low permeability reservoirs in the development of complex oil and gas resources is an important part of it. Carbon dioxide immiscible gas flooding is an effective and widely used development technology for enhancing oil recovery in low permeability oilfields. However, due to the large differences in the pore-throat structure characteristics of low-permeability reservoirs, mainly fine pores and thin throats, and large specific surface area, the surface action, microcapillary action, and electrochemical action on the solid-liquid interface are enhanced, show...

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