NOMENCLATURE 



Symbol 



Description 



D 



D.R. 

 (D.R.), 

 (D.R.) 



5 

 e 

 E 



f 



FFP 



FSIP 



h 



ISIP 



J 



k 



kh 



kh/fi 



In 



N 

 n 

 P 



Pf 

 Po 

 Ps 



p,„ 



PlO 

 AP 



AP t 



total 



form 



P.I. 



(Pi), 



Q 



Va 

 Vl 

 q 2 ,q 3 , 



c h 



9n 



s 



t 



h 

 At 



constant rate of change of production rate 



distance to a linear barrier 



compressibility 



(t -\- 0) I 6 at a specific point 



damage ratio 



normal damage ratio, zero skin 



measured damage ratio 



0/t Q , a ratio 



base of natural logarithms 



error in pressure 



porosity fraction 



final flowing pressure 



final shut-in pressure 



sand thickness 



initial shut-in pressure 



a subscript number 



permeability 



capacity 



transmissibility 



logarithm base e 



logarithm base 10 



viscosity 



number of logarithmic cycles 



number of differential flow periods 



pressure 



flowing pressure 



pressure at the infinite boundary 



extrapolated formation pressure 



pressure at the wellbore 



pressure at the point where (t -\- 6) / 8 = 10 



pressure difference over one logarithmic cycle 



pressure drop across the formation proper 



total pressure across a wellbore 



productivity index 



measured productivity index 



varying production rate 



average production rate 



initial production rate 



different but constant 



production rates 



final production rate 



radial distance from the well 



wellbore radius 



skin resistance 



flowing time 



total flowing time 



differential flowing periods 



shut-in time 



arbitrary variable 



754 



