Group 3/4

GullfaksVillage 2012 – Group 3 &4 IOR-challenge 1. Existing H1 model with faults and new production wells 1. Discuss geological factors that lead to the good communication Lower Brent Group of the H1 segment at Gullfaks. Make a base case simulation with the H1-model with existing wells. Additional perforations in the wells are possible. 2. The group shall make a simulation run where the transmissibility across all faults are set to zero. 3. Increase the number of wells to get an oil recovery similar to the base case. 4. Calculate the Net Present Value (NPV) of the additional wells in the case of reduced communication relative to the base case. Well cost is 200 MNOK and oil price fixed to 100 $/bbl. Use discount of 8%.

Lower Brent, segment H1 STOOIP in lower Brent is 20,3 MSm³ oil. Lower Brent in H1 has ”only” 57 % recovery factor. Potential 2 - 5 MSm³ mobile oil left. Relatively isolated segment. A lot of data is collected in this area. It was the first production area and therefore a lot of good, initial data. 2 wells in lower Brent, A-35 (injector) and A-39A (producer). 2 producers in upper Brent, B-37(partly in LB) and A-38A. Pressure communication between B-37 and lower Brent. No communication from A-35 to A-38A. 3 3

Faults in H1 segment GRID section All faults are in Include file all_faults_ksaa191_1.flt Include file consist of all faults for GF MF UB and LB choose only the faults in H1 LB area Use keyword MULTFLT to modify the transmissibility across faults in H1 Simulate prediction case one more time with closed faults Compare with previous prediction run

Well Recompletion and New wells Wells can be recompleted and added in this exercise in Layers 24-52 (LB) SCHEDULE section WELSPECS ‘NewWell’ ‘H1’ 40 77 1* ‘ OIL’ / COMPDAT completion table WCONINJE for injection wells WCONPROD for producers BHP limitation 310 bars for injection wells

Example COMPDAT -- WELL I J K1 K2 Sat. CF DIAM KH SKIN ND DIR Ro 'A-39A' 47 80 35 46 'OPEN' 1* 10.169 0.178 879.363 2* 'Y' 9.143 / 'A-39A' 47 80 47 47 'OPEN' 1* 10.169 0.178 879.363 2* 'Y' 9.143 / 'A-39A' 47 80 48 48 'OPEN' 1* 59.249 0.178 4652.653 2* 'Y' 5.971 / 'A-39A' 47 80 49 49 'OPEN' 1* 0.378 0.178 36.756 2* 'Y' 16.229 / 'A-39A' 47 79 49 49 'OPEN' 1* 0.971 0.178 94.038 2* 'Y' 15.954 / 'A-39A' 47 78 49 49 'OPEN' 1* 0.505 0.178 49.426 2* 'Y' 16.752 / 'A-39A' 48 77 48 48 'OPEN' 1* 8.392 0.178 593.183 2* 'Y' 3.923 / 'A-39A' 48 76 48 48 'OPEN' 1* 20.916 0.178 1560.038 2* 'Y' 4.835 / 'A-39A' 48 76 49 49 'OPEN' 1* 0.142 0.178 11.519 2* 'Y' 6.894 / 'A-39A' 48 75 49 49 'OPEN' 1* 0.224 0.178 21.426 2* 'Y' 15.028 / 'A-39A' 48 74 49 49 'OPEN' 1* 0.139 0.178 13.622 2* 'Y' 16.766 / 'A-39A' 48 73 47 47 'OPEN' 1* 61.283 0.178 5387.449 2* 'Y' 9.873 / 'A-39A' 48 72 47 47 'OPEN' 1* 16.859 0.178 1469.998 2* 'Y' 9.501 / 'A-39A' 48 72 48 48 'SHUT' 1* 13.356 0.178 1132.827 2* 'Y' 8.363 / 'A-39A' 48 71 48 48 'SHUT' 1* 9.434 0.178 801.444 2* 'Y' 8.424 / 'A-39A' 48 71 49 49 'SHUT' 1* 16.988 0.178 1393.035 2* 'Y' 7.193 / 'A-39A' 48 70 49 49 'OPEN' 1* 27.571 0.178 2376.110 2* 'Y' 8.999 / /

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