The gascap reservoir shown in Fig. 3.6 is estimated, from volumetric calculations, to have had an initial oil volume N of 115 x 106 stb. The cumulative oil production NP and cumulative GOR Rp are listed in Table 3.1, as functions of the average reservoir pressure, over the first few years of production. (Also listed are the relevant PVT data, again taken from Table 2.4, under the assumption that, for this particular application, pi= pb = 3330 psia). 1). The size of the gascap is uncertain with the best estimate, based on geological information, giving the value of m=0.4. Is this figure confirmed by the production and pressure history? If not, what is the correct value of m? 2). If there is uncertainty in both the value of N and m, what will be the corrected values for them? 3). Once N and m are determined in Question #2, what will be the correct value for We? 5.615 F 1 Pressure B = R = R7 B, CD CD1 5.615 E (psia) (rb/stb) (rb/scf) 4000 (p;) 1.2417 (Boir) 510 (R) 3500 1.2480 510 3330 (P) 1.2511 (Bob Co 1, S 510 .00087 3000 1.2222 450 .00096 2700 1.2022 401 .00107 2400 1.1822 352 .00119 2100 1.1633 304 .00137 1800 1.1450 257 .00161 1500 1.1287 214 .00196 1200 1.1115 167 .00249 900 1.0940 122 .00339 600 1.0763 78 .00519 300 1.0583 35 .01066 TABLE 2.4 Field PVT parameters adjusted for single stage, surface separation at 150 psia and 80F; Cby-7993 (Data for pressures above 3330 psi are taken from the flash experiment, table 2.1). Pressure Rs Bg Np Rp MMstb scf/stb psia rb/stb scf/stb rb/scf 3330 1.2511 510 0.00087 3200 2.426 1047 1.2397 486 0.00091 3000 5.903 1060 1.2222 450 0.00096 2800 9.380 1073 1.2047 414 0.00101 2600 13.441 1253 1.1955 383 0.00111 2400 17.730 1300 1.1822 352 0.00120 2200 22.019 1347 1.1689 321 0.00129 Table 3.1 (scf/stb)