Authigenic carbon dioxide oil displacement recovery ratio technology in oil layer

Abstract

The invention relates to authigenic carbon dioxide oil displacement recovery ratio technology in an oil layer in the technology of performing carbon dioxide composite multi-drive in oil reservoir layer and other ultra-low permeability oil layers and in low permeability oil layers constructed by oil blockage layer cracks and subjected to oil formation improvement technology of oil extraction carbon dioxide composite multi-drive by using the fireflood principle in the oil field extraction work. The technology has two technical schemes that: the first technical scheme is to perform 50 percent of oxygen-enriched injection in segmentation in an air injection well in the oil fields subjected to in-situ combustion to achieve the effect of miscible drive, namely the recovery ratio of the oil layer is improved; and the second technical scheme is that: after an electric heater is arranged under an injection well, air is injected, as the air is continuously heated and injected, the temperature under the well continuously rises, and when strong oxidation is generated under the well, 30 percent of CO2 can be produced, so the final recovery ratio can be improved. The authigenic carbon dioxide oil displacement recovery ratio technology has significant economic benefits.

Description

Technical field: [0001] The present invention relates to: in the oil recovery operation of the oil field: oil reservoirs and other ultra-low permeability oil layers of the oil field, use the fractured multi-fracture oil layer to plug the cracks to form the low permeability oil layer, and carry out the oil layer crack plugging technology of the oil layer transformation technology of carbon dioxide compound multi-flooding for oil recovery Create low-permeability oil layers, fire flooding principle to carry out carbon dioxide compound polyflooding technology: self-generated carbon dioxide flooding oil recovery technology in oil layers. Background technique [0002] At present: oil reservoirs and other ultra-low permeability oil layers in oilfields have very low oil production rate by conventional oil recovery and are of no value in production. In the early stage, fracturing technology was used for fracturing. After fracturing, some results have been obtained, but the recovery ra...

AI Technical Summary

Problems solved by technology

[0002] At present: oil reservoirs and other ultra-low permeability oil layers in oilfields have very low oil production rate by conventional oil recovery and are of no value in production. In the early stage, fracturing technology was used for fracturing. After fracturing, some results have been obtained, but the recovery rate is very low. Until production stopped; in order to improve the oil recovery effect, I designed the oil recovery principle of fire flooding and enriched oxygen technology. I have studied the oil recovery technology of self-generated carbon dioxide flooding in the oil layer; this technology is different from: the current oil field development enters the middle and later stages of oil recovery, in order to increase the recoverable reserves, the water injection, gas injection, and CO injection 2 and other chemical injections; among them: middle and later experiments prove that CO injection 2 Mixed direction flooding works best, but CO2 is injected on the ground 2 Difficulties are relatively large in terms of technical requirements: First, CO 2 Ground manufacturing is required and the injection pressure is relatively high. According to the ground test to achieve mixed direction oil displacement, the injection pressure must exceed 26 MPa atmospheric pressure; these conditions are generally not met by the geological conditions of the reservoir