Question 4) Over a period of 10 months, a dry gas reservoir experienced a pressure decrease...

 

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Question 4) Over a period of 10 months, a dry gas reservoir experienced a pressure decrease from 3000 to 2050 psia under an active water drive. Notably, no appreciable water production was observed by the end of this period. The Production data are provided below. Assume Z = 0.8 within the range of reservoir pressures and T = 140F. t [month] 0 Average reservoir pressure [psia] Gp [MMSCF] 3000 0 2.5 2750 97.6 5 7.5 10 2500 218.9 2250 355.4 2050 500.0 A) Calculate the original hydrocarbon gas in the reservoir (SCF). Hint: Consider using an appropriate graphical technique. B) How much water has encroached into the reservoir after the end of the 10-month period in bbl? C) The production records indicate that, at the end of the eleventh month of production (t=11 months), the cumulative gas production from the reservoir is 576.03 MMSCF, accompanied by 17811 STB of water production. Assuming a production pattern similar to the previous ten months and no alteration in the production mechanisms, what is the average reservoir pressure at the end of t=11 months? (Bw = 1.0 bbl/STB; Z = 0.8) D) How much more water has encroached into the reservoir at the end of month 11 compared to month 10? Question 4) Over a period of 10 months, a dry gas reservoir experienced a pressure decrease from 3000 to 2050 psia under an active water drive. Notably, no appreciable water production was observed by the end of this period. The Production data are provided below. Assume Z = 0.8 within the range of reservoir pressures and T = 140F. t [month] 0 Average reservoir pressure [psia] Gp [MMSCF] 3000 0 2.5 2750 97.6 5 7.5 10 2500 218.9 2250 355.4 2050 500.0 A) Calculate the original hydrocarbon gas in the reservoir (SCF). Hint: Consider using an appropriate graphical technique. B) How much water has encroached into the reservoir after the end of the 10-month period in bbl? C) The production records indicate that, at the end of the eleventh month of production (t=11 months), the cumulative gas production from the reservoir is 576.03 MMSCF, accompanied by 17811 STB of water production. Assuming a production pattern similar to the previous ten months and no alteration in the production mechanisms, what is the average reservoir pressure at the end of t=11 months? (Bw = 1.0 bbl/STB; Z = 0.8) D) How much more water has encroached into the reservoir at the end of month 11 compared to month 10?