中国煤层气钻井技术现状及发展趋势.docx

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中国煤层气钻井技术现状及发展趋势

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摘要：对我国煤层气钻井完井技术现状进行了归纳和总结，结果认为：煤储层地质基础薄弱、井壁易失稳、煤层损害严重以及完井效果差等难题严重制约了我国煤层气高效勘探开发；已开展的多分支水平井技术、U型井技术及其配套的连通和裸眼造洞穴等技术取得了长足进展，一定程度上缓解了以上技术难题的制约。生产实践表明，由清水钻井引起的钻井安全与煤层保护的矛盾仍然突出，国内煤层气产量依然偏低。进而建议，加强对煤层专用钻井液、煤层损害解除方法的研究，尽快制定煤层气钻井相关室内实验评价方法和矿场评价方法的行业及国家标准，探索矿权制度改革，开展煤层气与常规气、致密气合呆关键技术研究，积极开展煤层气多层钻完井、复杂结构井增产措施配套技术研究。

关键词：中国?煤层气?钻井?多分支水平井?U型井?井壁稳定?煤层保护?研究方向

State-of-the-artanddevelopingtrendofCBMdrillingtechnologiesinChina

Abstract：Manybottleneckingtechnicaldifficultiesincludingweakgeologicalfoundation，poorwellborestability，seriousdamagetocoalseamsduringdrillin9，etc．areseriouslyhamperingthecoalbedmethane(CBM)explorationanddevelopmentinChina．However，someprogressmadeinnmhilateralhorizontalwelltechnology，U-shapewelltechnologyandtheirsupportingtechniquesinconnectionandbare-holecavewellcompletion，hasalleviatedtheaboveproblemstoacertaindegree．TheproductionpracticesshowthattheconflictbetweendrillingsafetyandcoalprotectionresultedfromwaterdrillingisstillprominentandCBMproductionisstilllow．InordertoeffectivelyimprovetheexplorationanddevelopmentbenefitofCBM，wepresentedsomesuggestionsasfollows．(1)Specificdrillingfluidsforcoalseamsandson!ereliefmethodsfordamagetocoalseamsshouldberesearchedanddeveloped．(2)TheunifiedindustrialcodesandnationalstandardsshouldbesoonformulatedforCBMdrillingrelatedexperimentalandfieldevaluarionmethods．(3)Theminingrightsystemreformshouldbeexploredanddeepened．(4)FurtherstudiesshouldbeconductedoftechnologiesinthecombinedproductionofCBM，conventionalgas，andtightgas，andsomeCBMenhancedtechnologieslikemuhilayerdrillingandcompletion，complexstructufewellstimulationtechniques，andsoon．

Keywords：China，CBM，drilling，muhibranchhorizontalwell，U-shapewell，wellborestability，coalseamdamagecontrol

中国煤层气资源量为30×1012～35×1012m3，其中埋深为300～150