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煤炭科学技术 2015
不同煤储层渗透率下煤层气直井极限产气量的确定, PP. 72-75 Keywords: coalbed,methane,permeability,limit,production,value,start,pressure,gradient Abstract: Inordertofindoutthelimitproductionvalueofacoalbedmethanewellundertheconditionofdifferentcoalreservoirpermeabilityandtoensurethesustainablestablehighproductionofcoalbedmethane,accordingtothecoalreservoirgeometricmodel,therelationshipbetweenthestartpressuregradientandpermeabilityandthegaswelltest,seepagetheoryandincombinationwiththelabmeasuringandtest,alimitproductionvaluemathematicmodelofthecoalbedmethaneverticalwellundertheconditionofdifferentcoalreservoirpermeabilitywasestablished.TheverifiedresultsofShizhuangBlockexplorationdevelopmentinformationshowedthatwhenthelimitproductionvaluewasclosetotheaverageproductionvalueoftheproductionpeak,withtherationalcontrolofthegasproduction,thestableproductionperiodcouldbekeptinsustainableandhighproduction.Whenotherconditionswerethesame,thelimitproductionvaluewouldbeincreasedinpowerwiththepermeabilityincreasedandwouldbeincreasedinindexwiththewaterproductiontimeofthesinglephasewaterflowstageexpanded.Whenthecoalreservoirpermeabilitywasrelativelylow,topossiblyexpandthewaterdrainagetimeatthesinglephasewaterflowstagewouldbeakeymeasuretoimprovethegasproductionvalueofthecoalbedmethanewell.
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