煤层气井钻井液技术分析

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1、density,cationexchangecapacity,waterabsorbabilityofcoal，coaldispensability,stresssensitivityandspeedsensitivityofCBMreservoirarestudied．Wesystematicallyanalysistheimpactofcoalchemicalpropertiesonreservoirprotection．Theresultsshowedthatthecoalstudiedhaslowerrankandstrongwat

2、erabsorbentability．TheHi曲lydevelopedfracturesincoalareoftenfilledwithclayminerals．Whenthedrillingfluidfiltrateinvadethereservoir,itwillleadtothedissolutionofthecementandexpansionofthefractures．Thehydrationswellingoftheclaymineralsinfracturescallleadtothedeclineinpermeabili

3、tyofreservoir．Weshouldavoidtheadverseeffectscausedbythechemicalpropertiesofcoal．Accordingtotheoptimizationexperimentoffoamdrillingfluid,twodrillingfluidformulaswhichalesuitableforCBMdrillinghavebeenobtained．Thedensityoftwodrillingfluidformulasisbetween0．7g／em3andO．85edern3

4、．Twodrillingfluidformulashavelongseparationtimeandhalflife．Viscosityandshearforceismoderate．filterlossislow．Twodrillingfluidformulashavegoodabilityofanti-NaCl，anti-oil，anti-kerosene，anti—pulverizedcoal．Theyhavegoodperformanceofinhibitorypropertyandlubricity．Itisconduciveto

5、protectthereservoirs．Keywords：Coalbedgas，Formationdamage，Foam，Drillingfluid◆■■l●l卜一目录第一章前言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．1第二章煤层气井钻井液研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．22．1中国煤岩和煤层气储层的特点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．22．1．1煤层气储层渗透率较低⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯22．1．2含气饱和度低⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

6、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯22．1．3我国煤层气储层属于低压储层⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯22．1．4裂缝割离和微小孔隙高度发育⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯22．1．5煤岩表面带有电荷⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯32．2煤层气井钻井液所应具备的性能⋯⋯⋯：⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．32．2．1钻井液要有较好的封堵性能⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．32．2．2煤层气井钻井液密度大小应当合理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯42．2．3煤层气井钻井液抑制性能要好⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52．2．4钻井液中应当加入表面活性剂⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52．2．5煤层气井钻井液要有合适pH⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．52．3国内煤层气井钻井液研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52．3．1优质膨润土钻井液⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52．3．2空气钻井⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62．3．3清水钻井⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62-3．4空心玻璃漂珠钻井液⋯⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62．3．5泡沫钻井液体系⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62．4国外煤层气井钻井液研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯