Formation permeability evaluation and productivity prediction based on mobility from pressure measurement while drilling

SHI Xinlei,CUI Yunjiang,XU Wankun,ZHANG Jiansheng,GUAN Yeqin

Table 4 The comparison between productivities predicted by the new model and adjacent oilfield model with actual production data.

Well number Oil layer thickness/m Pressure difference/ MPa Viscosity of oil/ (mPa•s) Adjacent Oilfield Model New Model Production Data Average permeability (thickness weighted)/ 10-3 μm2 Specific productivity index/ (m3•MPa-1• d-1•m-1) Oil production/ (m3•d-1) Average permeability (thickness weighted)/ 10-3 μm2 Specific productivity index/ (m3•MPa-• d-1•m-1) Oil pro- duction/ (m3•d-1) Specific productivity index/ (m3•MPa-1• d-1•m-1) Pressure difference/ MPa Oil pro- duction/ (m3•d-1) A31 33.7 4 50 1 306 1.08 145.2 485 0.67 90.7 0.54 5.1 92.9 A40 26.0 4 53 927 0.84 87.4 476 0.64 66.6 0.61 4.4 70.0 A39 70.3 4 82 1 710 0.95 267.1 1 063 0.81 227.8 0.63 5.4 239.2 A30 45.0 4 42 854 0.93 167.4 852 1.13 203.4 1.17 4.1 215.9