Study on Experiment Conditions of Seepage Law of Marine Shale Gas
Received date: 2014-12-02
Revised date: 2015-03-09
Online published: 2015-06-10
Two methods to hold the experiment pressure were adopted to select the best condition for testing the gas seepage law of the marine shale gas core in south China,which are constant confining pressure mode and constant net confining pressure mode.The influence of different confining pressure mode on the experiment results was analyzed.And the best mode was selected under the actual formation condition.The conclusions show that gas flow rate increases with the injection pressure,whatever by the way of constant confining pressure or constant net confining pressure.The gas seepage law curve of the marine shale gas core in south China is nonlinear.The curve is divided into two regions including segment curve and pseudo linear curve,and the inflection points are 1MPa and 1.3MPa,respectively.The values of average permeability damage rate are 52.41% and 40.56%,respectively.The slip effect was affected by the confining pressure control mode.The change of injection pressure caused stress sensitivity,and the stress sensitivity effect was more obvious in the actual formation under the constant confining pressure.The influence of the slip effect on seepage law of marine shale gas is more than the stress sensitivity under the condition of low effective stress.A complete seepage law curve can be obtained,and a period of the seepage situation in the formation can be simulated under the constant net confining pressure.The results provide meaningful guidance for the gas field.The net confining pressure mode was also affected by the confining pressure,and the flow rate would decrease with the increase of the confining pressure.Above all,the net confining pressure is the best way to test the seepage law of the marine shale gas core in south China.
ZHU Wei-yao,TIAN Wei,GAO Ying,DENG Jia,ZHANG Xue-ling,QI Qian,MA Qian . Study on Experiment Conditions of Seepage Law of Marine Shale Gas[J]. Natural Gas Geoscience, 2015 , 26(6) : 1106 -1112 . DOI: 10.11764/j.issn.1672-1926.2015.06.1106
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