Method for calculating relative permeability of two-phase fluid in spontaneous imbibition process of tight reservoir

Abstract

The invention relates to a method for calculating the relative permeability of a two-phase fluid in a spontaneous imbibition process of a tight reservoir. The method is an effective means for evaluating the seepage dynamics of a spontaneous imbibition two-phase fluid in a tight reservoir. The method successively comprises steps of: (1) preparing a core for a spontaneous imbibition NMR experiment;(2) obtaining a sample saturated simulated formation water condition NMR T2 spectrum; (3) performing a sample NMR spontaneous imbibition experiment to obtain different spontaneous imbibition time T2 spectrums; (4) calculating the water saturation of different spontaneous imbibition time samples and a T2 spectrum logarithmic mean value; and (5) calculating the relative permeability of two-phase fluid in spontaneous imbibition process. The method, in combination with the saturated water state and the spontaneous imbibition process NMR T2 spectrum, accurately calculates the relative permeabilityof the two-phase fluid in the spontaneous imbibition process of the tight reservoir, and lays a foundation for the dynamic evaluation of the tight reservoir development.

Description

technical field [0001] The invention relates to a method for calculating the relative permeability of spontaneous imbibition two-phase fluid of reservoir, especially for the calculation of relative permeability of spontaneous imbibition two-phase fluid of tight reservoir. Mainly combined with the spontaneous imbibition nuclear magnetic resonance experiment of tight reservoir cores, it can quantitatively calculate the relative permeability of gas-water (or oil-water) two-phase seepage in the process of spontaneous imbibition of tight oil to tight reservoirs. It is an accurate and effective tight reservoir A dynamic evaluation method for spontaneous imbibition in the development process. Background technique [0002] With the sharp increase in global energy demand and the depletion of conventional oil and gas resources, the exploration and development of unconventional resources represented by tight oil and gas has been paid more and more attention. Different from conventiona...

AI Technical Summary

Problems solved by technology

In the process of spontaneous imbibition, the force of the two-phase seepage process is mainly capillary pressure and gravity, and there is no external displacement pressure, so it cannot be accurately measured. This makes the conventional relative permeability test and calculation metho

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