Experimental evaluation method of water trap damage of dense oil reservoir

Abstract

The invention relates to an experimental evaluation method of water trap damage of a dense oil reservoir. In order to solve the problems that by the conventional water trap damage experiment method, when a dense oil reservoir core is used as an evaluation object, liquid permeability cannot be measured and cannot be accurately measured and experimental pressure conditions cannot simulate the underground production pressure and the reservoir pore pressure and the like, the invention provides an experimental method for effectively and objectively evaluating the water trap damage of the dense oil reservoir. Through exertion of a back pressure on the outlet end of the dense core, an underground production pressure condition and a reservoir pore pressure condition are simulated and the defects that the conventional flooding cannot effectively establish the pore pressure inside the core and simulate the underground production pressure are overcome. Through exertion of the back pressure on the outlet end, the movability of a movable pore throat inside the dense core can be significantly improved, the liquid seepage capability is enhanced, the precision and accuracy for measuring the liquid flow of the dense core are improved, an evaluation result can represent the underground production state of the dense oil reservoir and can objectively evaluate the water trap damage of the dense oil reservoir. The experimental evaluation method is an experiment method applied to core analysis and reservoir protection during exploration and development of petroleum and natural gas.

Description

technical field [0001] The invention relates to the field of core analysis of oil and natural gas tight reservoirs. The method simulates the pressure seepage environment at the bottom of the well during the production process of tight oil layers, and realizes the effective establishment of internal pore pressure and ultra-low water saturation of plunger rock samples in tight oil layers, ensuring that The objectivity of the evaluation of the experimental conditions realizes the accurate evaluation of the water-phase trap damage of the tight oil layer, which belongs to the experimental method of core analysis in the process of oil and gas exploration and development. Background technique [0002] Tight oil layers (tight sandstone oil layers, tight carbonate rock oil layers) are rich in reserves and have great development potential, and are playing an increasingly important role in the growth of oil and gas reserves and energy supply. Horizontal well staged fracturing technolog...

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Problems solved by technology

[0008] In order to solve the problems of inaccurate liquid flow measurement, limited evaluation scope, and overestimation of evaluation results in the existing evaluation methods for water phase trap damage when tight oil layers are evaluated, combined with tight oil layers in situ reservoir water saturation According to the seepage environment under the state of high degree and actual production state, the present invention proposes an experimental method for objectively evaluating water phase trap damage in tight oil layers indoors

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