Page 49 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2
P. 49
Basic Principles, Definitions, and Data 37
Table 5-6
Permeabllltv Conversion Factors
1 darcy = 1,000 rnillidarcies; 1 rnillidarcy = 0.001 darcy
= 0.9869233 pm2 (1 rnd G 109 pn2)
1 darcy = ( =/s=)( CP)
(cd) (atrn)/crn
= 9.869 x l04cd
= 1.062 x 1O-”ff
From Reference 19.
gradient of one atmosphere per centimeter. For liquid flow in a linear porous
system, the flow rate q in barrels per day is [20]:
(5-39)
where k is in darcies, A is in ft2, p is in cp, L is in ft, and pressures are in psia,
For laminar gas flow in a linear system [20]:
where q is in Mscf/D, T is in OR(’, + 460), z is the dimensionless compressibility
factor, and the other terms are in units consistent with Equation 5-39.
Radial Flow. Production from or injection into a reservoir can be viewed as
flow for a cylindrical region around the wellbore. For the steady-state radial flow
of an incompressible fluid [19]:
