Page 212 - Petrophysics 2E

PERMEABILlTY-POROSITY RELATIONSHIPS I85

TABLE 3.14
PRESSURE DRAWDOWN TEST
Time, hr Pd, psia AP, psi t*AP’, psi

0 2733 0 0.00
0.1 2703 30 31.05
0.2 2672 61 58.95
0.3 2644 89 84.14
0.4 2616 117 106.30
0.65 2553 180 129.70
1 2500 233 125.69
2 2398 335 144.39
3 2353 380 102.10
4 2329 404 81.44
5 2312 42 1 65.42
7 2293 440 34.47
9.6 2291 442 5.62
12 2290 443 6.32
16.8 2287 446 7.63
33.6 2282 45 1 7.99
50 2279 454 7.94
72 2276 457 10.50
85 2274 459 12.18
100 2272 461 13.36

Using Equation 3.132

qwo (250)( 1.2)( 1.229)
k = 162.6- = 162.6 = 202 mD
mh (18.5)( 16)

From Figure 3.58, the value of (t*p’)R = 8 psi is obtained by
extrapolating the horizontal line portion of the pressure derivative
curve to the vertical axis. This line corresponds to the radial flow
regime. Using Equation 3.133 we obtain:

70.6qyB0 (250)(1.2)( 1.229)
k= = 70.6 = 203 mD
h(t*Ap’)R (16)(8)

STATISTICAL ZONATION TECHNIQUE

Reservoir description may be approached in a number of ways.
Hutchison et al. developed a method for statistically predicting the