Evaluating method of oil and gas reservoir seepage by supercritical carbon dioxide fracturing fluid and method thereof

Abstract

The invention belongs to the technical field of irregular oil gas development and production increase, and particularly relates to an evaluating method of oil and gas reservoir seepage by supercritical carbon dioxide fracturing fluid and a method thereof; a carbon dioxide pressurizing and filling system provides carbon dioxide air source and pressure, and is connected with a supercritical carbon dioxide fracturing fluid phase balance reaction system; the supercritical carbon dioxide fracturing fluid phase balance reaction system is linked with a temperature control system in parallel; a core displacement and permeability measuring system is respectively connected with the supercritical carbon dioxide fracturing fluid phase balance reaction system and a return pressure system, so that the fracturing fluid is effected on the core; the return pressure system provides necessary return pressure for experiment, so as to simulate the real formation condition. The device can adjust the experiment temperature and pressure according to different experiments, and exactly determine the damage rate of the supercritical carbon dioxide fracturing fluid core, and study influences of supercritical carbon dioxide fracturing fluid on the core damage rate under different experimental conditions.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas development and production increase, and in particular relates to a device and method for evaluating the influence of supercritical carbon dioxide fracturing fluid on seepage of oil and gas reservoirs. Background technique [0002] With the advancement of oil and gas field development technology, more and more attention has been paid to the development of low-permeability, tight and other unconventional oil and gas resources. Low permeability oil and gas resources refer to oil and gas resources with low permeability, low reserve abundance and low single well productivity. my country's low-permeability oil and gas resources are rich in reserves and widely distributed, accounting for more than 2 / 3 of the country's proven reserves, with huge development potential. As the main measure to increase the production of low-permeability oil and gas fields, fracturing technology has been ...

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Problems solved by technology

[0004] However, during the fracturing operation, the supercritical carbon dioxide fracturing fluid will also enter the porous medium of the formation under a sufficiently high pressure, affecting the physical and chemical properties of the reservoir fluid and clay minerals. On the one hand, after the carbon dioxide enters the formation It will react with formation water to generate acid, dissolve some formation minerals and impurities, and increase formation permeability; formation damage

At present, there are few research reports at home and abroad on the evaluation of reservoir physical properties of supercritical carbon dioxide fracturing fluid, especially the evaluation of reservoir seepage capacity. Therefore, there is an urgent need for an evaluation device and method that realizes the above functions

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