Shale oil development injection-production system and method

Abstract

The invention discloses a shale oil development injection-production system and method. According to the shale oil development injection-production system and method, injection wells containing fracturing fracture nets are arranged in a shale oil reservoir, supercritical water is injected into the shale oil reservoir through a supercritical water injection system, and the supercritical water has high diffusivity and can overcome large capillary resistance; the supercritical water enters pore throat channels where a conventional water drive cannot enter, thus the swept volume is enlarged, the supercritical water is used for dissolving mineral components in the reservoir and conducting mild transformation on the reservoir, so that the pore throat channels are expanded, favorable conditions are created for flowing of shale oil, and the high reaction activity of the supercritical water is utilized, so that the shale oil can be converted from an immature state or a low mature state to a mature state in a short time, and long-chain molecules can also be converted into short-chain molecules, so that the quality and the flowability of the shale oil are improved; and pollution caused by shale oil in the ground refining process can be avoided or reduced, the natural environment is protected, and carbon emission is reduced.

Description

technical field [0001] The invention belongs to the field of energy and environment, and relates to a shale oil development system, in particular to a shale oil development injection-production system and method. Background technique [0002] Today, with the rapid development of social economy, the importance of oil and gas resources as the "propellant" of social and economic development is self-evident. The United States has greatly improved its own oil and gas self-sufficiency rate through the "shale revolution", which has brought confidence and encouragement to many countries with large shale oil and gas reserves. Continental shale oil reservoirs in China have strong heterogeneity, difficulty in predicting sweet spots, low degree of thermal evolution, low availability of crude oil, and poor fluidity, making effective development very difficult. At present, relying on a single conventional horizontal well volume fracturing and conventional formation injection compatible w...

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Problems solved by technology

The fluids in the existing fluid heating in-situ upgrading technology use subcritical water or water vapor with a temperature lower than 374 degrees Celsius, as well as air, carbon dioxide, hydrocarbon gases, organic solvents, etc., which have limited effects on the pores of shale oil reservoirs.

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