Estimating Errors When Analyzing Two-Rate Flow Tests
- R. C. Earlougher Jr. (Scientific Software Corp.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 1973
- Document Type
- Journal Paper
- 545 - 547
- 1973. Society of Petroleum Engineers
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- 4 since 2007
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Pinson1 recently described a technique for simplifying the analysis of two-rate transient flow tests. For rigorous analysis, one should plot Pwf vs (equation).
This graph will have a straight-line section with slope m, which is related to the system transmissibility (kh/µ). Pinson suggests plotting Pwf vs log Δt when the first flow rate, q1 , acts over a long time. This plot should have a straight-line portion whose slope, m', is related to system transmissibility.
Pinson does not indicate how long the initial flow period must be before the simplified analysis method provides valid results. This note presents a method for estimating the error obtained in transmissibility and skin factor when the simplified analysis technique is used for a two-rate flow test. This error can be used to decide which analysis technique to use.
By combining the complete flow equations1,2 we obtain the error in calculated transmissibility when the simplified analysis technique is used.
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