An EC summer school by Sellwood, Astrophysical discs.

By Sellwood, Astrophysical discs.

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5. 18) The analysis methods 34 0.. F d u- At t k_ 0.. Period # 1,2 ..... 5, eq 6 ............ 10, r ql ..... q5 =0, q6 ............ 9. Multiple- rate history,. Example with 10 periods before shut-in. 10, the well is produced 60 hours and shut-in for a pressure build-up. A sealing fault is present near the well and, at 80 hours (20 hours after shutin), the infinite acting radial flow regime ends to change slowly to the hemi-radial flow geometry. During the 20 initial hours of the shut-in period (cumulative time 60 to 80 hours), both the extended drawdown and the injection periods are in radial flow regime.

2. 2. The early time unit slope straight line is matched on the "wellbore storage" asymptote but the final choice of the Cj~)e2s curve is frequently not unique. 3, all curves above Cz)e 2x =10 s provide an acceptable match (the test data, for this illustrative example used through Chapter 2, has been published by Bourdet et al. in 1983 a). Results of log-log analysis The pressure match defines the displacement between the y-axis of the two log-log plots, as the ratio P M = pD/Ap. 3: Pressure curves analysis 29 1 02 1 0 60 10 5~ 10 40 10 3o "" 10 2 0 1015 1010 /1R::::~=i~::E~~ 10 8 10 6 ~ 1 0 4 10 3 10 1 .

The curve match on pressure and derivative data give access to additional well and reservoir parameters. , 1983 a), the CDe 2s group is identified by the shape of the derivative hump, and by the pressure curve match. The double log-log match is confirmed with a match of the pressure type-curve on semilog scales to accurately adjust the skin factor and the initial pressure. A simulation of the complete test history is presented on linear scale in order to check the rates any changes in the well behavior or the average pressure.

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