STUDY ON TEMPORAL SCALES OF MASS TRANSFER PROCESSES IN DEVELOPING TIGHT SANDSTONE GAS RESERVOIRS
Received date: 2006-09-04
Revised date: 2006-12-14
Online published: 2008-06-20
Tight sandstone gas reservoirs are characterized by strong Spatial Scales, including matrix pore and throat scale, natural fracture scale, hydraulic fracture scale, and macro gas well scale. The distribution and flow of fluids are controlled by this multi-scale structure in the gas reservoirs. Mass transfer processes in the tight sandstone gas reservoirs consist of desorption, diffusion and percolation in the matrix pore and throat scale, and percolation in the natural fracture and hydraulic fracture scales. Gas flow in different scales has time scale effect and is easily influenced by circumstance changes. Gas percolation is faster in fractures and slower in pores and throats, and gas diffusion in matrix is the slowest. Based on the gas mass transfer processes in four spatial scales in tight sandstone gas reservoirs, formulae for calculating the characteristic time of the different modes of gas transfer in different scales are derived, and the ranges of spatial and temporal scales are specified. Results show that the time scales of matrix gas diffusion and percolation are 101~1010 seconds and 100~106 seconds, and the time scale of natural fracture and hydraulic fracture scales is 10-2~101 seconds. Such time effects result in lack of gas supply from tight matrix to natural fractures. Therefore, employing both damage control and stimulation should be emphasized, and using special wells, multilayercommingled production and infilling wells will promote the economic exploitation of tight sand gas reservoirs.
LI Qian-gui,KANG Yi-li,YANG Jian,ZHANGHao,YOU Li-jun . STUDY ON TEMPORAL SCALES OF MASS TRANSFER PROCESSES IN DEVELOPING TIGHT SANDSTONE GAS RESERVOIRS[J]. Natural Gas Geoscience, 2007 , 18(1) : 149 -153 . DOI: 10.11764/j.issn.1672-1926.2007.01.149
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