地應力反演方法及井壁穩(wěn)定性研究

1、一㈣緲一⑧天串大謦地應力反演方法及井壁穩(wěn)定性研究碩士學位論文■■■一一_______一學科專業(yè)：固體力學作者姓名：趙永富指導教師：蔡親熙教授天津大學研究生院2008年5月ABSTRACTW池theincreasingofdepthofpetroleumexplorationandtheappearanceofvariousadvanceddrillingtechnique，boreholestabilityhasattractedalo

2、tofattentionToachieveafastandsafedrillingandtoweakenthepollutiontoreservoir，thefundamentalbaseistomakeaccurateanalysisforthestabilityofboreholeTherearefourfactors，theformationstresses，thenatureofformationthegeometryofwel

3、landthedrillingmuddensitywhichhavemajorinfluenceontheboreholestabilityGettingtheexactdataofinsirestresswouldlaythefoundationforboreholestabilitySOthestudyoftheinversionofformationstressesandthestabilityofboreholeisofvita

4、lpracticalsignificanceInthispaper，basedupontheoryofelasticity，thestressesfieldofsidewallwereanalyzed1heserviceabilityofsomeclassicaltheoreticalmodelsandtworevisionmodelsforboreholestabilitywerediscussedBoththemodelsforfo

5、rmationstressescalculationwithtectonicstressandwithouttectonicstresswerecomparedByusingthemodelforformationstressescalculationwithtectonicstress，thenewmethodfortheinversionofformationstresseswerestudiedConsideringthefact

6、thatthedataofhydraulicfracturingmethodisnoteasytoobtaillweproposedtwomethodsfortheinversionofformationstresses，oneofthemisbasedoncollapsedataandanotheriscombinedcollapsedatawithhydraulicfracturingdataByusingtheformations

7、tressesobtainedfrominversion，wegiventhemethodforthecalculationofcollapsepressureandfracturepressureandfinallythemuddensitywindowsforsafedrillingBasedontheformationstressesdistributioncharacteristicsandit’Saffectedfactors

8、，byconsideringvariesfailuretheoriesandinversionmethodofformationstresses，asoftwareforthecalculationofformationstressesandmuddensitywindowsisdevelopedT【lissoftwarehastheadvantagethatitCalldealwithallthelogdataandavailable

9、resultstodetermineparametersrequiredforformationstresscalculationItCallalsogivethestressprofilealongthedepthSincedataofcollapseCanbeeasilyobtained，twonewinversionmethodsofformationstressesweproposedandtherelevantsoftware