Test analysis method and device of shale oil reservoir CO<2>-injection imbibition oil displacement efficiency

Abstract

The invention discloses a test analysis method and device of shale oil reservoir CO<2>-injection imbibition oil displacement efficiency. The method comprises the steps that a core is packaged into a core packaging container, and the core packaging container is placed in a probe in a nuclear magnetic resonance system magnetic field; the core is heated and pressurized to set temperature and set pressure and then is maintained constant; nuclear magnetic electronic equipment is utilized to obtain a nuclear magnetic resonance spectrum T<2> in an initial state and a nuclear magnetic resonance spectrum T<2> at imbibition time t; and based on a non-overlapping region of a curve area between the nuclear magnetic resonance spectrum T<2> in the initial state and the nuclear magnetic resonance spectrum T<2> at the imbibition time t, the oil displacement efficiency of shale oil reservoir CO<2>-injection imbibition separate core oil, the oil displacement efficiency of oil which seeps out and is attached to a core wall, the total oil displacement efficiency of imbibition and seeping core oil and the distribution state of residual oil are calculated. Through the experimental device and the analysis method, the imbibition oil displacement efficiency under a formation condition can be reflected.

Description

Technical field [0001] The invention belongs to the technical field of oilfield exploration, and more specifically, relates to a shale oil reservoir CO injection 2 Test and analysis method and device for imbibition oil displacement efficiency. Background technique [0002] According to the IEA 2013 Resource Evaluation Report, the global technically recoverable shale oil resources are 345 billion barrels, an increase of 313 billion barrels from the 32 billion barrels in 2011, an increase of 10 times and accounting for 10% of the global crude oil resources. U.S. shale oil technically recoverable resources are 58 billion barrels, accounting for 26% of U.S. crude oil resources. In 2012, U.S. shale oil production reached 720,000 barrels per day. Driven and inspired by the successful development of shale oil in the United States, China has begun to attach importance to the exploration and development of shale oil in recent years. According to the IEA 2013 Resource Evaluation Report, C...

AI Technical Summary

Problems solved by technology

The experimental device of the weighing method is simple, and the measurement error is large. The volume method measures the oil displacement efficiency of the oil separated from the core, and it is difficult to calculate the oil displacement efficiency of the oil that seeps out and attaches to the core wall. Therefore, there are problems with the conventional method and the device. It is normal temperature, normal pressure, large error and cannot reflect the real imbibition process and imbibition results

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