简介:本文分析了我国煤层气勘探开发现状和前景,研究了我国煤层气储层孔隙和裂隙系统特征,分析了煤层气钻井的储层伤害机理。针对煤层气钻井储层保护难点,提出了采用低固相或无固相钻井液、欠平衡钻井技术、屏蔽暂堵技术和加强固相控制等煤层气钻井储层保护技术。
简介:1.NewenergyvehicleprovidesgoodopportunitiesforthedevelopmentofNiMHpowerbatteryUnderthebackgroundofdevelopinglowcarboneconomyglobally,allcountrieshighlightthedevelopmentofnewenergyandenergy-savingautosindustry.Keyautoproducingcountrieshaveformulatedseriesofpoliciestoencouragethedevelopmentoftheindustry.Productioncapacityofnewenergyandenergy-savingvehicleswillachievethescaleof1,000,000perannumby2015,accordingtoAmerican
简介:d.Rareearthexport1).REexportvolume.Exportvolumeofrareearthsincreasedyear-on-yearfrom1986to2005inChina.But,tostabilizerareearthmarketandfacilitatetheoptimizationofrareearthindustrystructure,Chinesegovernmenthadtakenseriespoliciessince2006,includingreducingexportquota,cancelingexporttariffrebate,adjustingtariffpolicies,increasingexporttax