Stratum stress sensitive experiment testing method and device

Abstract

The invention provides a stratum stress sensitive experiment testing method and device. The method comprises the following steps: (1) obtaining actual geological data; (2) selecting a formula for calculating a reservoir stratum pressure arch ratio according to a shape of a reservoir stratum and dynamic property difference of the reservoir stratum and surrounding rock; (3) determining initial reservoir stratum pressure and initial overburden pressure of reservoir stratum rock; (4) determining a change relation of confining pressure and driving pressure along return pressure; (5) recovering a rock core with undeveloped natural fractures to an original confined water saturation degree; (6) carrying out ageing treatment on the rock core; (7) recovering original stress and fluid pressure of the rock core; (8) simulating stress sensibility of the reservoir stratum in an exploitation process; (9) processing and analyzing data. According to the stratum stress sensitive experiment testing method and device, a quantitative change relation of the overburden pressure of the reservoir stratum along pore pressure in an oil-gas reservoir development process can be obtained according to the actual geological data of oil-gas reservoirs.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a test method and device for stratum stress sensitivity experiments. Background technique [0002] The reserves of low-permeability and ultra-low-permeability oil and gas fields account for a relatively large proportion of my country's undeveloped petroleum geological reserves, and they are the resource base for my country's petroleum industry to increase reserves and production. Their reasonable and effective development plays a vital role in the development of my country's petroleum industry . To rationally develop low-permeability reservoirs, it is an important prerequisite to understand the particularity of low-permeability reservoirs in development. [0003] For deeply buried oil and gas reservoirs, the reservoir rocks are simultaneously affected by the overlying strata pressure, surrounding lateral pressure, and pore fluid pressure. Before the oil and gas reservoirs are deve...

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Problems solved by technology

The designed experimental device can realize the function of simulating the mining process, changing the confining pressure and internal pressure synchronously, and can solve the problem of poor stability of displacement pressure difference in the experiment

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