Case Study 1 - Solutions - CASE 1 In this case study a well...

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1 CASE 1 In this case study a well is producing at a constant rate of 1500 stb/d for a period of 100 hrs. This represents a drawdown well test, with the following general data provided: The pressure recordings are shown in the table below: A plot of flowing well pressure versus time is shown below (lin-lin). Note the first point is omitted for the purpose of clarity. A second plot of flowing pressure versus log of time is shown below(log-lin):
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2 From adding a line to the straight line region in the semi log plot we can see the pressure starts to veer from linear behavior (on a log scale) at time equal to 4.25 hrs. Therefore from the data we can say that the infinitely acting stage occurs from 1 hr (our first known point) to 4.25 hours, since infinitely acting behavior will appear as a straight line on a semi-log plot. From adding a line to the straight line region in the normal Cartesian plot we can see the pressure starts to veer from linear behavior at time equal to 30 hrs. Therefore from the data we can say that semi-steady state flow occurs from 30 hrs to 100 hours (our last data point), since semi-steady state behavior will act linearly on a lin-lin plot. 2300 2400 2500 2600 2700 2800 2900 3000 1 10 100 Pressure (psia) Log time Case Study 1
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3 Note that in between 4.25 hrs and 30 hours we have a transition from infinitely acting flow to semi-steady state flow. The slope in the transient region of the semi-log plot can be used to determine the reservoir permeability, as follows:
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