Difference between revisions of "Oil Material Balance"
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== Discussion == | == Discussion == | ||
| − | {{Quote| text = ... most powerful tool for investigating reservoirs and understanding their performance ... | source = Dake <ref name=DakeP />}} | + | {{Quote| text = ... most powerful tool for investigating reservoirs and understanding their performance ... | source = L.P. Dake <ref name=DakeP />}} |
== See also == | == See also == | ||
Revision as of 12:43, 28 March 2018
Brief
The general form of the Oil Material Balance equation was first published by Schilthuis in 1941[1].
Math & Physics
Equating all underground withdrawals to the sum of the volume changes[1]:
For use in the code to find Pres:
Pres = Pi - (Np * Bo + Np * (Rp - Rs) * Bg + (Wp * Bw - Wi * Bw - Ggi * Bgi - We * Bw) - (N * (Bo - Boi) + N * (Rsi - Rs) * Bg + m * N * Boi * (Bg / Bgi - 1))) * (1 - Swc) / (N * (1 + m) * Boi * (cw * Swc + cf))
For use in the code to find Np:
Np = (N * (Bo - Boi) + N * (Rsi - Rs) * Bg + m * N * Boi * (Bg / Bgi - 1) + N * (1 + m) * Boi * (Pi - Pres) * (cw * Swc + cf) / (1 - Swc) - (Wp * Bw - Wi * Bw - Ggi * Bgi - We * Bw)) / (Bo + (Rp - Rs) * Bg)
Discussion
... most powerful tool for investigating reservoirs and understanding their performance ...— L.P. Dake [2]
See also
Nomenclature
= gas formation volume factor, ft3/scf
= initial gas formation volume factor, ft3/scf
= gas initially in place, scf
= cumulative gas produced, scf
References
- ↑ 1.0 1.1 Dake, L.P. (1978). Fundamentals of Reservoir Engineering. Amsterdam, Hetherlands: Elsevier Science. ISBN 0-444-41830-X.
- ↑ Dake, L.P. (1994). The Practice of Reservoir Engineering. Amsterdam, Hetherlands: Elsevier Science. ISBN 0-444-88538-2.
