An evaluation method of water lock release ability based on coupled detection of saturation and permeability

Abstract

The invention discloses a water-blocking release capability evaluation method for saturation and permeability coupling detection. The evaluation method comprises the following steps: packaging an insulating on a core to be evaluated, and arranging a plurality of pairs of exciting electrodes and detection electrodes at intervals on the surface of the insulating layer; applying confining pressure tothe core and injecting an air source, measuring to obtain the pressure differences between two ends of upper and lower streams of the core and the gas flow of the outflow core, namely obtaining the permeability of the core; stopping injecting the air source, using a signal generating and processing system to obtain the conductivity distribution of the core; simultaneously, carrying out the following two steps to realize water-blocking release capability evaluation for the core: (1) enabling saturated liquid or partially saturated liquid of the core to obtain the conductivity distribution of the core by using the signal generating and processing process, and then obtaining the change of the saturation distribution of the core; and (2) applying confining pressure to the core and injecting the air source, measuring to obtain the pressure differences between two ends of upper and lower streams of the core and the gas flow of the outflow core, namely obtaining the permeability of the core.

Description

technical field [0001] The invention relates to a water lock release ability evaluation method for coupled detection of saturation and permeability, and belongs to the fields of oil and gas field development engineering and porous medium seepage mechanism research. Background technique [0002] With the adjustment of energy structure and the continuous development of unconventional energy, the experience of unconventional resource development is also maturing. Hydraulic fracturing has played a huge role in the development of unconventional reservoirs. Conventional reservoirs represented by sandstone have high permeability, large porosity, relatively simple pore-throat structure, and high silica content in the rock matrix. When fracturing fluid enters such rocks, it will block the gas flow channels and form water lock damage. Therefore, for conventional sandstone reservoirs, enhancing flowback is one of the key points of research. However, in unconventional reservoirs, espe...

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Problems solved by technology

At present, there is no method to quantitatively evaluate the water lock release ability of the core

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