Method and device for determining stress sensitivity of reservoirs

Abstract

The invention provides a method and a device for determining the stress sensitivity of reservoirs. The method includes determining body effective stress borne by rock frameworks of the to-be-detected reservoirs according to overburden pressures, porosity parameters and formation pore fluid pressures of the to-be-detected reservoirs; determining the types of the to-be-detected reservoirs according to physical property analysis results of the to-be-detected reservoirs; selecting corresponding stress sensitivity models according to the types of the to-be-detected reservoirs; combining the body effective stress and the selected stress sensitivity models with one another and determining the stress sensitivity of the to-be-detected reservoirs. The method and the device in an embodiment of the invention have the advantages that the stress sensitivity degrees of the reservoirs are determined by means of comprehensively utilizing processes for changing the formation pore fluid pressures and changing the overburden pressures, accordingly, the shortcomings due to the fact that the stress sensitivity degrees of existing reservoirs are determined by means of only changing existing formation pore fluid pressures or only changing existing overburden pressures can be overcome, the ultimately determined stress sensitivity degrees of the reservoirs are high in precision, and the method and the device have guiding significance in efficient development of oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for determining stress sensitivity of reservoirs. Background technique [0002] At present, it is of great significance to carry out reservoir stress sensitivity experiments and establish a stress sensitivity dynamic model in line with production practice to accelerate the development of oil and gas reservoirs. Reservoir stress sensitivity can refer to the phenomenon of reservoir permeability changes caused by changes in effective stress during drilling, completion and development. The research on the physical parameters of oil and gas reservoirs shows that under different stress and strain states, the porosity and permeability of reservoir rocks are not a constant, but are related to the stress state. Compared with medium and high permeability reservoirs, low permeability reservoirs are more sensitive to stress. Ultra-deep high-pressure low-p...

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Problems solved by technology

[0005] The present invention provides a method and device for determining reservoir stress sensitivity to solve the problem of the measured reservoir stress in the prior art when only changing formation pore fluid pressure or only changing overlying strata pressure to measure reservoir stress sensitivity Sensitivity is poorly consistent with actual oilfield development

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