Technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 (carbon dioxide) excessively into oil well

Abstract

The invention relates to a technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 (carbon dioxide) excessively into an oil well. According to the technology, a high-pressure air pump, an injection well, an oil producing well, a blocking area, a crack seam, a break seam and a CO2 dispersionarea are adopted. The technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 excessively into the oil well is characterized in that the high-pressure air pump injects CO2 into a waste oil filed or an oil layer in an oil area under the supercritical pressure via the injection well, and thick, sticky and dispersed residual oil is displaced to be discharged out of the oil producing well by the aid of ultrastrong permeability, diffusivity and cleaning capability of CO2 liquid. Blocking materials are repeatedly injected into the injection well at intervals to block a smooth channel between the injection well and the oil producing well, the CO2 liquid is forced to disperse and pressurize to crack oil layer partitions and penetrate oil area partitions on the same oil layer, and thus the CO2 liquid is dispersed to all partitions, dead angles and blind areas. Compared with the prior art, the technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 excessively into the oil well has the advantages of thorough residual oil displacement, large capacity of solid-buried CO2, stable sealed storage, less air pollution, freedom of underground pollution, and environment-protection and emission reduction under the support of creating new benefits, so that the technology has great popularization and application values.

Description

technical field [0001] The invention relates to a comprehensive technology for carbon sequestration and emission reduction and oil recovery, in particular to an oil well supercritical excessive injection of CO 2 Realize the technology of maximizing embedding and residual oil displacement. Background technique [0002] CO produced by modern human activities 2 , has far exceeded the storage and utilization mechanism of the normal cycle metabolism in nature, so that CO 2 A large amount of accumulation in the atmosphere has significantly affected the meteorological laws of the earth, climate change and the structure of the surface of the earth's crust, deteriorating the living conditions and environment of human beings. What is even more tragic is that although this negative change has been recognized and prevented by people, the reality is still developing and deteriorating at an accelerated rate within its breadth and depth, making human beings deeply entangled in the contra...

AI Technical Summary

Problems solved by technology

CO 2 After injection into the oil layer, it is very easy to clean the viscous oil along the low-resistance area by cleaning, and it is easy to form the shortest smooth channel between the injection well and the oil outlet well, which limits the CO 2 The liquid diffuses to the surrounding area, dead angle and dead space

2. Due to the above reasons, the residual oil displacement area is narrow, the area is small, the oil output of the oil well is low, the oil content is low, the benefit is poor, and the cost is high

3. Due to the above reasons, the embedded CO 2 Small quantity, unstable embedding environment, CO 2 It is easy to leak out and repeat, and the short-term and long-term effects are poor

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