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1、US008122954B2(12)UmtedStatesPatent(10)PatentNo.:US8,122,954B2Estesetal.(45)DateofPatent:Feb.28,2012(54)DOWNHOLEDEPTHCOMPUTATION‘51,373,2*1%;E3850dJal702/6,,owar,r.et...............METHODSANDRELATEDSYSTEM5,058,077A10/1991Twist5,230,387A7/1993Wttl.(75)Inventors:Rober
2、tEstes,Tomball,TX(US);Jerry5,274,552A12/1993M11183;3Cerkovnik,HighlandsRanch,CO(US);5,341,886A8/1994PattonGaryJ.CressWell,Houston,TX(US);2523;;JretalWilliamJ.Befeld,Richmond,TX(US)537323776A3/1998Tubelgt31‘5,812,068A*9/1998Wislereta1................340/855.5(73)Ass
3、ignee:BakerHughesIncorporated,Houton,5,813,480A9/1998Zaleski,Jr.TX(Us)5,896,939A4/1999Witte6,046,685A4/2000Tubel(*)Notice:Subjecttoanydisclaimer,thetermofthis(Continued)patentisextendedoradjustedunder35U_S~C_154(1))by592days'FOREIGNPATENTDOCUMENTSEP0361996Al4/1990(
4、21)Appl.No.:11/858,077(Continued)(22)FilediseP-19,2007PrimaryExaminer*WilliamPNeuder___AssistantExaminer*RobertEFuller(65)PnorPubhcatlonData(74)Attorney,Agent,orFirm*Mossman,Kumar&Tyler,Us2008/0105423A1May8,2008PCRelatedUS.ApplicationData(57)ABSTRACT(60)Provisional
5、applicationNo.60/845912?ledonSep.Amethodfordelermipingdepthinawenbqreusesinertial202006’’nav1gat1on1ncon]unct1onW1thadatabasehavingoneormore’'measuredparameterscorrelatedWithdepth.Themeasured(51)Int_CLparametermaybethelengthsofstandsformingadrillstring,E21B47/09(20
6、0601)priorsurveydatarelatingtoanaturallyoccurringfeaturesuch(52)U5Cl166/2551_166/64166/6673/15202asformationlithology,ordatarelatingtoahumanmade,'''"""",,'’’’'featuresuchascollarsinacasingstring.ThedoWnholepro(58)FleldofClassl1?6c672Tn62éa7rgl1536125525514;cessorma
7、yuseaccelerometermeasurementstocalculateaS1.t.?lf’’1t'’hh.‘t’'measureddepthofaBHAandaccessthedatabasetoretrieveeeapp10aIoneorComp6eSeam15my‘apredicteddepththatcorrespondsWithoneormoresensor(56)ReferencesCitedmeasurements(e.g.,motionindicatingtheadditionofastandtoad
8、rillstring).Thereafter,ifthedoWnholeprocessordeterminesthatthepredicteddepthisinagreementWiththecalU.S.PATENTDOCUMENTSculateddepth,theprocessorst
