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1、第32卷第4期石油鉆采工藝Vo1.32No.42010年7月OILDRILLING&PR0DUCT10NTECHNOLOGYJuly2010文章編號:1000~7393f2010)04—009105煤層氣U型井鉆井采氣技術(shù)研究鮮保安'夏柏如張義鮑清英王海軍劉建偉(1.中國地質(zhì)大學(xué),北京100083;2.中國石油勘探開發(fā)研究院廊坊分院,河北廊坊065007:3華北油田公司采油工藝研究院,河北任丘062552)摘要:國內(nèi)高陡構(gòu)造煤層氣資源豐富、分布較廣,開發(fā)潛力巨大。針對高陡構(gòu)造煤儲層特點(diǎn),提出了一種
2、適合開發(fā)高陡構(gòu)造煤層氣的U型井鉆完井技術(shù),并結(jié)合霍林河盆地低煤階煤層氣地質(zhì)特征,給出了配套的U型井鉆完井技術(shù)、欠平衡鉆井工藝及地面采氣技術(shù)。結(jié)果表明:u型井鉆采技術(shù)充分利用了直井和定向井的技術(shù)優(yōu)勢,可結(jié)合煤儲層地質(zhì)特性,利用流體勢能原理實(shí)現(xiàn)煤層的排水降壓采氣;采用充氣欠平衡鉆井技術(shù),通過合理優(yōu)化注氣排量、注氣壓力和鉆井液排量等,可有效保護(hù)煤儲層,減少儲層污染;采用組合u型井鉆采技術(shù),可實(shí)現(xiàn)多口U型井共用一口直井進(jìn)行排采,從而節(jié)約地面資源,發(fā)揮一井多用的作用。關(guān)鍵詞:煤層氣;U型井;欠平衡鉆井;鉆采
3、技術(shù)中圖分類號:TE242.9文獻(xiàn)標(biāo)識號:AStudyondrillingandextractiontechnologiesforU—shapeCBMwellsXIANBa0an,XIABairu,ZHANGYi,BAOQingying,WANGHaijun,LIUJianwei(1ChinaUniversityofGeosciences,Beijing100083,China;2ResearchInstituteofPetroleumExplorationandDevelopment-Langf
4、ang,PetroChina,Langfang065007,China;3.ResearchInstituteofOilProductionTechnology,HuabeiOilfieldCompany,Renqiu062550,China)Abstract:Thehighsteepstructurecoal—bedmethane(CBM)resourcesareabundantandwidelydistributedinhighsteepstruc—turesinChina,SOthereis
5、greatpotentialfordevelopment.Accordingtothecharacteristicsofcoalseamsinhighsteepstrucmres,anewtechnology,namelyU—shapewelldrillingandcompletiontechnology,isproposed,anditissuitablefordevelopingtheCBMinhighsteepstructure.Basedonthegeologicfeaturesoflow
6、—rankCBMinHuolinheBasin,theU·shapewelldrillingandcompletiontech—nology,theunder-balanceddrillingtechnology,andthesurfaceacquisitiontechnology,etc.,arealsointroducedindetails.ItcomestoconclusionthattheU—shapedrillingandextractiontechnologyhastheadvanta
7、gesofbothverticalwellsanddirectionalwells,itcouldimplementthedewateringandgasproducingwiththegeologicfeaturesandtheenergyofposition,anditcouldalsopreventthecoalseamsfrompollutionwiththeunder—balanceddrillingtechnology.ByusingthecombinedU—shapedrilling
8、technology,gascouldbeproducedfromthecommonverticalwellforseveralU—shapewells,itcouldsavealotofsurfacefacilities.Keywords:CBM;U—shapewell;under-balanceddrilling;drillingandextractiontechnology國內(nèi)煤層氣儲層地質(zhì)構(gòu)造相對復(fù)雜,與之相適單斜或向斜、背斜相對陡峭的翼部煤層,其煤層傾角應(yīng)的鉆完井技術(shù)與油