The lower limit of the flowing pore throat radius in the extra-low permeability reservoir

3rd International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Xiang, Junhui^1 ; Yin, Daiyin^1

School of Petroleum Engineering, Northeast Petroleum University, Daqing , Heilongjiang

163318, China^1

关键词: Capillary pressure curves;    Constant speed;    Extra low-permeability;    Horizontal axis;    Mercury injection;    Nuclear Magnetic Resonance (NMR);    Oil reservoirs;    Pore throat radius;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/113/1/012040/pdf
DOI  :  10.1088/1755-1315/113/1/012040

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this paper, a method for determining the lower limit of flowing pore throat radius of the extra low permeability reservoir in the periphery of Changyuan Oil Fields is given. The capillary pressure curve is divided into linear type and concave type. The nuclear magnetic resonance (NMR) T2 spectrum is divided into 3 types: the left peak is greater than the right peak, the left peak is equal to the right one, and the left peak is smaller than the right one. The method for determining the lower limit of flowing pore throat radius is, first, converting the nuclear magnetic resonance T2 spectrum to the capillary pressure curve calculated, then fitting the capillary pressure curves measured by the constant speed mercury injection experiment and the capillary pressure curve calculated. After finding the relevant parameters, converting the horizontal axis of the NMR T2 spectra from relaxation time to pore throat radius, and the pore throat radius corresponding to the T2 cutoff value is the lower limit of the flowing pore throat radius. The lower limit of the flowing pore throat radius of the extra low permeability Fuyang Oil Reservoir in the periphery of Changyuan Oil Fields is about 0.68μm.