Case 1 The Virginia Hills Beaverhill Lake field is a volumetric undersaturated

# Case 1 the virginia hills beaverhill lake field is a

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Case 1 The Virginia Hills Beaverhill Lake field is a volumetric undersaturated reservoir. Volumetric calculations indicate the reservoir contains 270.6 MMSTB of oil initially in place. The initial reservoir pressure is 3685 Calculate the initial oil in place by using MBE and compare with the volumetric estimate of psi. The following additional data are available: Step 1 Calculate the initial water and rock expansion term Ef,w from equation 11-37 N 270.6 MMSTB Bf,w 1.00313E-005 X (3685 -Average Pr) Pi 3685 psi Swi 0.24 Step 2 Construct the follwoing table : Bw 1 bbl/STB Avrg Pr, psi F, Mbbl Eo, bbl/STB Δp Ef,w Eo + Ef,w cw 3.62 3.62E-006 Eq. 11-35 Eq. 11-36 cf 4.95 4.95E-006 3685 0.00 0 0 0 0.00000 Pb 1500 psi 3680 26.84 0.0002 5 0.000050 0.00025 3676 45.54 0.0002 9 0.000090 0.00029 Field production and PVT data 3667 102.95 0.0003 18 0.000181 0.00048 3664 133.47 0.0003 21 0.000211 0.00051 Volumetric Average pressure No Of Producing wells Bo (bbl/STB Np (MSTB) Wp (MSTB) 3640 282.74 0.0007 45 0.000451 0.00115 3685 1 1.3102 0 0 3605 478.23 0.0014 80 0.000803 0.00220 3680 2 1.3104 20.481 0 3567 712.66 0.002 118 0.001184 0.00318 3676 2 1.3104 34.75 0 3515 1105.63 0.0026 170 0.001705 0.00431 3667 3 1.3105 78.557 0 3448 1674.72 0.0028 237 0.002377 0.00518 3664 4 1.3105 101.846 0 3360 2229.84 0.0048 325 0.003260 0.00806 3640 19 1.3109 215.681 0 3275 2805.73 0.0058 410 0.004113 0.00991 3605 25 1.3116 364.613 0 3188 3399.71 0.0068 497 0.004986 0.01179 3567 36 1.3122 542.985 0.159 3515 48 1.3128 841.581 0.805 Step 3 Plot the underground withdrawal term F against the expansion term (Eo + Ef,w) o 3448 59 1.313 1273.53 2.579 Ste0 4 Draw the best straight line through the points and determine the slope of the lin 3360 59 1.315 1691.887 5.008 N (slope) 286 MMSTB 3275 61 1.316 2127.077 6.5 3188 61 1.317 2575.33 8
N on a cartesian scale, as shown figure 11-18 ne and the volume of the active initial oil in place as :
The production history and the PVT data of a gas-cap-drive reservoir are given below: Solution Step 1 Calculate the cumulative produced gas oil ratio Rp Date Avrg P, psi Np, MSTB Gp, Mscf Bt, bbl/STB Bg, bbl/scf Avrg P, psi Np, MSTB Gp, Mscf Rp, scf/STB F B 1/5/1989 4415 1.6291 0.00077 4415 975 0 1.6291 1/1/1991 3875 492.5 751.3 1.6839

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• Spring '14
• water influx, cumulative water influx, initial oil, Net water influx
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