AnalysisofFormationFracturingfortheMaxiHDDQinRiverCrossingProjectinChina

AnalysisofFormationFracturingfortheMaxiHDDQinRiverCrossingProjectinChina.pdf
AnewirrigationpipelinewasinstalledusingtheHorizontalDirectionalDrilling(HDD)methodinordertoalleviatethewatershortagesituationinJiaozuoCity,HenanProvince,China.ThispipeinstallationprojectincludedtwoparallelHDDcrossings,withapipediameterof1016mmandadrivenlengthof1750mforbothofthem.Basedonthepreliminarydetailedgeologicalsurveyreportoftheriverbed,hydro-fracturingcontrolunderhighslurrypressurewouldbeabigchallengeforthisproject.Thispapersummarizesthepredictionmethodsforthemaximumallowablemudpressureintheboreholebasedondifferentmechanismsofformationfracturing.Basedonthegeologicaldataofthiscrossingproject,theDelftequationandanotherpredictionmethodbasedontensilefailure(termedheretheXiamethod)wereusedtocalculatethemaximumallowableannularpressure.Therealpumpingpressureofthisprojectwasrecordedbythecontractor.Bycomparingthetheoreticalpredictionsofallowablepressurewiththeactualpressuresforthehorizontalsectionoftheborehole,itindicatedthattheXiamethodisconservativeandthelimitsoftheDelftequationcouldnotbeverifiedinthisproject.Asasolutiondealingwithpotentialhydro-fracturing,finiteelementmodelingshownthatincreasingthegroundsurfaceloadwouldrisetheboreholeallowablepressureatwhichfracturingwouldoccur.Thissolutionwasusedtodealwithablow-outintheentrysectionofonepilotholeonthisproject.Undertheguidanceofthetheoreticalandnumericalsimulationresults,theQinRivercrossingprojectwassuccessfullycompleted.
作者：XuefengYanBaosongMaCongZengYongLiu
作者单位：FacultyofEngineering,ChinaUniversityofGeosciences,Wuhan430074,China
母体文献：第九届管道工程与非开挖技术国际研讨会论文集
会议名称：第九届管道工程与非开挖技术国际研讨会  
会议时间：2018年10月24日
会议地点：武汉
主办单位：中国地质大学
语种：chi
分类号：
关键词：HDD  riverbedcrossing  hydro-fracture  Delftequation  numericalsimulation
在线出版日期：2021年12月15日
基金项目：
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AnalysisofFormationFracturingfortheMaxiHDDQinRiverCrossingProjectinChina.pdf

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