Method for improving recovery ratio of shale oil

Abstract

The invention discloses a method for improving the recovery ratio of shale oil, and the method exploits the shale oil based on modified fracturing fluid in combination with a hydraulic fracturing technology and a microwave irradiation technology. According to the method, firstly, a water-soluble organic compound is doped into fracturing fluid by utilizing the water solubility of the water-solubleorganic compound; secondly, the light shale oil is directly exploited by utilizing the hydraulic fracturing technology and the microwave irradiation exploitation technology; and finally, by utilizingthe extraction performance of the water-soluble organic compound and the advantages of microwave-assisted extraction, the heavy shale oil difficult to extract is extracted into the fracturing fluid, and the shale oil is indirectly exploited. The method provided by the invention not only provides a clean and efficient method for exploiting the shale oil, but also provides a utilization way of the organic compound and microwaves.

Description

technical field [0001] The invention relates to a method for increasing the recovery rate of shale oil, which belongs to the emerging technical field of unconventional oil and gas exploitation. Background technique [0002] With the rapid development of the global economy, the world's demand for energy continues to rise; in 2019, the total global primary energy consumption has reached 583.9 EJ. Among them, the consumption of crude oil is 191.45 EJ, accounting for about 33.06% of the total primary energy consumption, and it occupies a dominant position in energy consumption. In recent years, the rapid development of China's economy has greatly increased the demand for oil and gas, but the growth of China's oil and gas production has been weak. In 2019, China's oil consumption was as high as 1.92×10 6 t / d, while the output is only 5.22×10 5 t / d. The huge contradiction between supply and demand makes my country's oil resources more dependent on foreign countries. Therefor...

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Problems solved by technology

[0004] The Chinese invention with the patent number CN201610567394.8 proposes a horizontal well fracturing device based on hydraulic fracturing, a horizontal well fracturing system and its operating method. Although this method can realize the effective exploitation of shale oil, there are shale Incomplete oil extraction, large consumption of water resources, high cost and poor stability of proppants for fracturing; the Chinese invention with the patent number CN201910485947.9 proposes a CO-based 2 A shale oil recovery method and device for fluid fracturing. This invention has the advantages of saving water resources, environmental protection, and high oil displacement efficiency. However, CO 2 It is difficult to manufacture gas sources, which leads to high cost of shale oil extraction; the Chinese invention with the patent number CN201910952701.8 proposes a method for in-situ upgrading and exploitation of shale oil by using an electric field to heat shale oil reservoirs. Heating Shale Oil Reservoirs to Extract Shale Oil in Situ

However, the shale matrix has limited microwave absorption capacity, so the utilization efficiency of microwave energy is low, resulting in high shale oil production costs

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