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Ming H.,Northwest University, China | Sun W.,Northwest University, China | Zhang L.,Sinopec | Wang Q.,Exploration and Development Research Institute of Xinjiang Oil field Company
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

Nuclear magnetic resonance and constant-rate mercury intrusion experiments were carried out to analyze the influence of microscopic pore structure on physical characteristics and occurrence characteristics of movable fluid. The results show that microscopic heterogeneity of tight sandstone reservoir is mainly caused by throat heterogeneity. Reservoir percolation ability is mainly controlled by throat size, number and distribution pattern, effective porosity and throat volume. Larger pore throat radius ratio and narrower distribution range are the main reasons for poor reservoir property and low levels of movable fluid. The discretion of movable fluid saturation, which has nothing to do with the spatial location, is only related to pore and throat radius. Type of throat and distribution features of the throat radius are important factors of movable fluid saturation. © 2015, Central South University of Technology. All right reserved. Source

Gao S.-S.,China University of Geosciences | Gao S.-S.,CAS Institute of Porous Flow and Fluid Mechanics | Qian G.-B.,Exploration and Development Research Institute of Xinjiang Oil field Company | Wang B.,Exploration and Development Research Institute of Xinjiang Oil field Company | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

A double media mathematical model is established according to the feature of the Xinjiang carboniferous volcanic rock gas reservoir; the cross flow among the matrix pore-fracture-borehole is studied by means of the numerical simulation; and how the interporosity flow coefficient λ influenced on the rate maintenance capability is analyzed quantitatively. Results indicate that there are two periods in the process of cross flow: transition period and stabilization period. In the transition period, the cross flow amount is smaller than the bottom hole inflow, and the bottom hole pressure drops quickly; in the stabilization period, the cross flow amount is equivalent to the bottom hole inflow, and the bottom hole pressure flattens out. The time needed from transition period to stabilization period is depended on the interporosity flow coefficient λ; the greater the λ, the shorter the time is need. If λ > 10-7, interporosity flow has little influence on gas well production. If λ < 10-8, stable yields is greatly influenced by the interporosity flow, and it is important to fix production according to the interporosity flow coefficient λ. Finally, an example is given to verify the correctness of these results. Source

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