Comprehensive Limits of the Movable Reserves in Fractured-Porous Sandstone

doi:10.11885/j.issn.1674-5086.2015.06.23.03

Abstract

Abstract:

The identification of limits in the movable reserves of a reservoir is the basis for the determination of its movable and immovable reserves. Through the simulation of fractured gas reservoirs using equivalent medium models, and evaluations based on the economic limits of single wells, we have identified the comprehensive limits of movable reserves in reservoirs with varying levels of fracture development in the XU-2 fractured porous sandstone gas reservoir of Pingluoba in Western Sichuan. The results of this study have shown that the properties of the matrix have the most significant impact on the cumulative gas production of a single well, whereas the fracture angle only has a very small effect. The influence of fracture density on the cumulative gas production of a single well was found to increase with decreases in matrix permeability. The comprehensive limits of the movable reserves also appear to decrease as natural fractures develop further. In reservoirs without developed fractures, the comprehensive limits of its movable reserves are as follows:its lower limit of permeability under overburden pressure is 0.008 mD, while its upper limit of water saturation is 42%, and its lower limit of porosity is 6.4%.

Key words: fractured porous sandstone gas reservoirs, movable reserves, equivalent medium, fracture density, comprehensive limits

CLC Number:

TE371

FANG Jianlong, PENG Xian, LIU Linqing, YE Liyou. Comprehensive Limits of the Movable Reserves in Fractured-Porous Sandstone[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 93-98.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.06.23.03

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