Air injection-assisted super heavy oil underground cracking improvement technology based on shaft heating modes

Abstract

The invention provides a technology method for comprehensive oil production and in-situ improvement of super heavy oil, oil shale, kerogen and medium and low-maturity shale oil reservoirs. The technology method is characterized in that a novel shaft electric heating in-situ cracking improvement technology is adopted, and is assisted by an air injection technology; by drilling a production well group into an oil bearing reservoir or adjusting the existing well network, a heating well, an air injection well and a production well are reasonably arranged; air is injected into the reservoir, and a heating cable in a heating well shaft is connected with an electric heating bar to heat the oil bearing reservoir, so as to realize the improvement of underground cracking of crude oil. The technology method has the advantages that by combining the advantages of shaft electric heating and air injection technologies, the problems of single heat transfer type, insufficient driving energy and the like in a single shaft electric heating mode are solved; by utilizing the heat effect of crude oil and oil oxidizing reaction, the stratum temperature is increased, the cracking temperature of the crude oil is decreased, the reaction rate of in-situ cracking is accelerated, the recovery efficient of the crude oil is improved, and the consumption of water resources and carbon emission are decreased.

Description

technical field [0001] The present invention relates to the high-efficiency exploitation of heavy oil reservoirs, oil shale, kerogen reservoirs and shale oil reservoirs with medium and low maturity, and in particular to a method of in-situ cracking of heavy oil and kerogen by using air injection to assist wellbore electric heating Modified process method. Background technique [0002] With the continuous decline of conventional oil and gas reserves, heavy oil resources have become an important alternative energy source. The key to the exploitation of heavy oil reservoirs lies in two points: one is to effectively reduce the viscosity of heavy oil and improve its flow capacity under reservoir conditions; the other is that the reservoir has sufficient driving energy to effectively displace crude oil to production wells, and then extracted to the surface. The thermal recovery technology based on steam injection is currently the most widely used heavy oil development method, co...

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Problems solved by technology

However, due to the development based on the natural energy of the reservoir, there is still the problem of insufficient reservoir energy, that is, part of the modified crude oil cannot be effectively displaced to the production well, and the wellbore electric heating mode mainly uses heat conduction for heat transfer, heating The range is relatively small, and the heating time is too long, which still has certain limitations

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