![]() ![]() The minifrac analysis is available using the Minifrac button in the More tools control panel as soon as a falloff is present in the extracted data. Extract the only available falloff keeping default extraction parameters.Įcrin v4.30 - Doc v4.30.05 - KAPPA 1988-2013 Saphir Guided Session #8 SapGS08- 4/11 B01.5 Early time bottom-hole pressure and injection rate gauges We can now proceed with the analysis by extracting the falloff data. ![]() Click on the Edit Rates tab to display these gauges as well as the identified groups (injection followed by falloff), use the horizontal zoomīutton to zoom around the injection period:įig. When opening the file, the pressure and water injection rate gauges are displayed in the browser. The bottom-hole pressure gauge was loaded using Load P and the settings shown below:Įcrin v4.30 - Doc v4.30.05 - KAPPA 1988-2013 Saphir Guided Session #8 SapGS08- 3/11 If the minifrac is performed on an aquifer zone, just input the monophasic water rate. The rates were loaded using the Load Q icon in the control panel, selecting Keyboard the gas rate (or oil rate in case of oil bearing layer) was set to zero and the two steps for injection and falloff entered as follows. The initial water saturation set to 12%.įig. The reservoir pressure was set to 10000 psia and the maximum pressure for the pseudo pressure calculation set at 15014.7 psia. All other parameters (including PVT parameters) were kept to their default values.Įcrin v4.30 - Doc v4.30.05 - KAPPA 1988-2013 Saphir Guided Session #8 SapGS08- 2/11 The PVT default values were used. The Pay Zone set to 50 feet as shown in the screenshot below. The file was created as follows: Gas was selected as the reference phase (it would have been Oil in case of oil formation or Water in case of aquifer) and water was declared as additional available rate. Start by opening the SapGS08.ks3 document. In this last case the analysis would be of course monophasic. Note that the same procedure could be used if the formation was an oil bearing layer or an aquifer. The injected zone is a gas bearing layer and has a pay thickness of 50 ft and the injected fluid is considered to be pure water. B01 Opening the Saphir analysis The example under consideration here consists of a first period of water injection (with a rate of 2900 STB/D) lasting for 0.1925 hour followed by a 158 hours falloff. ![]() The new specialized plots will be used to perform first a post shut-in analysis and then an after closure analysis in order to obtain the closure parameters, to identify the various flow regimes and to assess the reservoir pressure and the far field transmissibility. The minifrac analysis workflow will be explained and analyzed throughout one illustrative example. Ecrin v4.30 - Doc v4.30.05 - KAPPA 1988-2013 Saphir Guided Session #8 SapGS08- 1/11Ī01 Introduction This Guided Session illustrates the minifrac option available for analysis of pressure data falloff. ![]()
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