连续循环钻井技术的发展与研究

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1、第33卷第l期石油钻采工艺V01．33No．12011年1月OILDRILLlNG&PR0DUCT10NTECHNOLOGYJan．2011文章编号：1000—7393(2011)01000106连续循环钻井技术的发展与研究胡志坚马青芳邵强柳丙善(中国石油集团钻井工程技术研究院，北京100195)摘要：连续循环钻井技术主要采用连续循环系统和连续循环阀两种方式。与常规钻井方法相比，连续循环钻井具有显著的技术优势，在窄密度窗口井、海洋深水钻井、大位移井、水平井、欠平衡井、高温高压井以及天然气水合物开采等方面均有重要应用价值。另外，根据连续

2、循环钻井技术现状、特点以及发展趋势，从技术水平和操作安全性考虑，提出应以发展连续循环系统作为今后的主要研究目标，重点解决诸如钻杆本体保护、接头螺纹保护、高压动密封和钻井液分流控制等关健技术难点。关键词：连续循环钻井技术；连续循环系统；连续循环阀；技术优势；关键技术中图分类号：TE928文献标识码：ADevelopmentandinvestigationofcontinuouscirculationdrillingHUZhijian，MAQingfang，SHA0Qiang，LIUBingshan(CNPCDrillingResearc

3、hInstitute，Beijing100195，China)Abstract：Continuouscirculationdrilling(CCD)canmaintainthecontinuouscirculationofdrillingfluidwhenmakingorbreak—ingthestandsofdrillpipe，whichwillbuildupthesteadyequivalentcirculatingdensity(ECD)andguaranteetheuninterruptedblowingoutofthedeb

4、ris．Currently,therearemainlytwowaystorealizecontinuouscirculationdrilling，namelycontinuouscirculationsystem(CCS)andcontinuouscirculationvalve(CCV)．Theanalysisshowthatcomparedwiththeconventionaldrillingmethod，continuouscirculationdrillinghavesignificanttechnicaladvantage

5、s，sinceitcaneliminatebadeffect，suchassurge&swab，cuttingsettlementandgasaccumulation，andimprovetheECDcontrolability,whichwillefectivelyreduceincidentandstrengthendrillingsafety．Soithasmuchimportantpracticalvalueinmanyfields，suchasthewellwithlittlepore／fracturepressuregra

6、dientdifference，deepwaterwell，extendedreachwell，horizontalwell，underbalancedwell，highpressureandhightemperaturewell，andgashydrateexplorationwel1．Inaddition，accordingtothestatus，characteristicsandtrendsofCCDtechnology,andconsideringthetechnologicallevelandoperationalsafe

7、ty,itwasproposedthatthemainresearchobjectiveinfutureshouldbetodevelopcontinuouscirculationsystemandtosolvetheproblemsofsomekeytechnologiessuchasdrillpipeprotection，jointthreadprotection，dynamicsealinhighpressure，andmuddivertingcontro1．Keywords：continuouscirculationdrill

8、ing；continuouscirculationsystem；continuouscirculationvalve；technicaladvantage；keytechnology连续循环钻井(ContinuousCi