1、a1a2a3a4Ph)(00981.0ahMPHPa5mMPHPGahh/00981.0a6rmHP100981.00P0P0：上覆岩层压力；上覆岩层压力；MPaMPa；：无量纲的小数无量纲的小数rm:rm:岩石基质密度，岩石基质密度，g/cm3g/cm3；:地层空隙中流体密度，地层空隙中流体密度，g/cm3g/cm3；H H：井深，井深，m.m.a7pPP0PoPp a8a9HPa00981.0fahbPPPghbPPPa10HPa11a12 PDP PO海面/地面a13a14dHa15dbemDPKnV)(bDPnVd0684.0log0547.0log-1.5-1-0.500.511.5
2、024681012log(x)y00.511.522.533.5051015202530-log(0.0547V/N)da17mmNcdda18a19a20cpncnpdda21)(00NEGGHHGPpa22dcHPpHGGGHNE00)(HEHa23a24H声波时差CHett0ACHtt0lnlnH：井深，井深，m t:井深井深H处的泥岩声波时差，处的泥岩声波时差，s/ft t0:表层泥岩声波时差表层泥岩声波时差,s/ftC：正常趋势线斜率正常趋势线斜率A:正常趋势线截距正常趋势线截距a25a26a2702cos)(20rzmhHhHmrPPPpPPHPPPAPP)()(100pPPhPP
3、PBPP)()(100a28PtPFPSPPBAP)(3120a29测试方法测试方法PPf=Pstand_pipe+Pma30液压试验（泄漏试验）液压试验（泄漏试验）P泵入量：泵入量：V立立管管压压力力PAa31a32HPm/8.1011maxHPGmf100981.0a33tgCNC:岩石的粘聚力岩石的粘聚力：岩石的内摩擦角；岩石的内摩擦角；N:岩石剪切面上的法向正应力岩石剪切面上的法向正应力.a34HKKpCKphHstm22,0098.01232450ctgKa35a36a37a38a39a40井深井深当量泥浆密度当量泥浆密度GpGfa41wPSmaxmaxa42gmESmaxa43Km
4、ESmaxKnpmESHHmaxmaxa44ffmES当量泥浆密度当量泥浆密度GpGfa45a46fgwPfnrSSSmaxa47KnipfwPfnkSHHSSmaxmaxa48当量泥浆密度当量泥浆密度GpGf正常工况（起钻、下钻）正常工况（起钻、下钻）发生液流时发生液流时当量泥浆密度当量泥浆密度GpGfa50mmwpHSP)(00981.0minmaxa51WmmNpperSHPmin0098.0WmmapperSHPmin0098.0a52KninfWfnpperSHHSS,1采用迭代法，试取一个采用迭代法，试取一个Hn+1值求值求pper，如果如果pper大于该深度的实大于该深度的实际地
5、层压力梯度，且二者接近，际地层压力梯度，且二者接近，则则Hn+1就是尾管下入深度。就是尾管下入深度。GpGfHnHn+1WmmNpperSHPmin0098.01)中间套管下深中间套管下深Hn的确定的确定与与pper相对应的井深即为中相对应的井深即为中间套管下深间套管下深Hn。2)尾管下深尾管下深Hn+1的确定的确定KninfWfnpperSHHSS,1a54步骤步骤1 1、定中间套管最大下入、定中间套管最大下入深度假定点。深度假定点。当量泥浆密度当量泥浆密度GpGfa55当量泥浆密度当量泥浆密度GpGfa56当量泥浆密度当量泥浆密度GpGfa57当量泥浆密度当量泥浆密度GpGfa58a59a
6、6081/2a61破裂压力梯度f1H2H1450m3826m3H4146mp地层压力梯度a62破裂压力梯度f1H2H1450m3826m3H4146mp地层压力梯度 fDfDfgwPfnrSSSmaxa63NmHP)08.1(00981.03384)08.1776.1(00981.0Pa64NmH)08.1(00981.056.163/579.1338400981.056.16338408.100981.0cmgm破裂压力梯度f1H2H1450m3826m3H4146mp地层压力梯度a65024.0060.038264146)036.074.1(3826fEa66kfwfDSHHSS12)543.1(06.03826024.0)036.0543.1(1H060.010673826024.0)036.0543.1(1067fDa673/761.1024.0060.014503826)036.0543.1(1450cmgfD破裂压力梯度f1H2H1450m3826m3H4146mp地层压力梯度a68套管层次套管层次下入深度下入深度m表层套管表层套管中间套管中间套管中间尾管中间尾管油层套管油层套管1450382641464878破裂压力梯度f1H2H1450m3826m3H4146mp地层压力梯度a69
