Multi-stage pressure-measuring water-gas alternating oil extraction experimental device and method for CT scanning

Abstract

The invention discloses a multi-stage pressure-measuring water-gas alternating oil extraction experimental device and method for CT scanning. A core sample is arranged in an inner cavity of a seepagecavity, and a seepage cavity front-plug and a seepage cavity rear-plug are separately arranged at two ends of the core sample; the core sample, the seepage cavity front-plug and the seepage cavity rear-plug are covered with rock covering sleeves, and a seepage cavity injection opening and a seepage cavity liquid discharge outlet are separately formed in two ends of the seepage cavity; a confiningpressure valve and a confining pressure drain valve are arranged on the seepage cavity, and the condensing pressure valve is connected with a liquid injection pump; a water injection system and a gasinjection system are connected with the seepage cavity injection opening, and the seepage cavity liquid discharge outlet is connected with a metering system; and a pressure data collection system comprises a plurality of pressure sensors distributed in the length direction of the core sample, and the pressure sensors are used for detecting pressure at different positions of the core sample. The multi-stage pressure-measuring water-gas alternating oil extraction experimental device and method for CT scanning can be used for evaluating the pressure transmission law of fluid in the rock and the distribution characteristics of remaining oil under the action, and provide an important experimental basis for the design of the process parameters of oil extraction in a mine.

Description

technical field [0001] The invention belongs to the field of oil recovery engineering, and in particular relates to a multi-stage pressure measurement water-gas alternate oil recovery experimental device and method for CT scanning. Background technique [0002] At present, there are still a large amount of remaining oil scattered in underground reservoirs in my country's old oil fields. Exploring the technology of tapping the potential of old oil fields is of great significance for the stable production of crude oil in my country. [0003] Compared with the single traditional water flooding development and recovery mode, the oil injection-gas alternating oil recovery is more conducive to improving the oil recovery of the reservoir. The physical experiment of water-gas alternating oil recovery using core samples is the main means to evaluate the water-gas alternating oil recovery. However, Due to the complex pore structure of core samples, the law of fluid pressure conduction...

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Problems solved by technology

[0003] Compared with the single traditional water flooding development and recovery mode, the oil injection-gas alternating oil recovery is more conducive to improving the oil recovery of the reservoir. The physical experiment of water-gas alternating oil recovery using core samples is the main means to evaluate the water-gas alternating oil recovery. However, Due to the complex pore structure of the core sample, the law of fluid pressure conduction in the rock and the distribution characteristics of the remaining oil under the action of the water-gas energy replenishment process are still unclear, resulting in a lack of fine basis for the design of the on-site water-vapor cross-injection oil recovery process

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