(10)--10-Type Curve Analysis气藏工程气藏工程.ppt

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1、5.9 Type Curve Analysis-15.9 Type Curve Analysis-1Gas-well test analysis using type curvesGas-well test analysis using type curvesType curves:plots of theoretical solutions to flow equations,presented in dimensionless variables.Identify the appropriate reservoir modelIdentify the appropriate flow re

2、gimes for analysis Estimate reservoir propertiesDevelopment of type curvesGas-well test analysis using type curvesGas-well test analysis with derivative type curvesMain content:1、Development of Type CurvesAs a matter of convenience,type curves usually are presented in terms of dimensionless,rather t

3、han real variables.At the wellbore,Line source solution for slightly compressible liquidsRemay and Gringarten type curvesRadical diffusivity equation Initial condition is uniform pressureOuter boundary condition is an infinite acting or unbounded reservoirInner boundary condition is constant rate fl

4、ow with wellbore storage and skin factorRamey Type Curvesis dimensionless wellbore-storage coefficientGringarten Type CurvesRameyGringarten2、procedure of using Type CurvesThe theory underlying type-curve matching is that the type curve and test data plots differ only by displacement of both coordina

5、tes by constants.The horizontal axes of the type curve and test data plots are displaced by the constantThe vertical axes are displaced by the constant(1)Plot for a drawdown test or for a buildup test.Make the plot on either tracing paper or loglog paper the same size as the gringarten et al.type cu

6、rve.(2)If a unite slope line is present,calculate CDSteps:(3)Record the values of the parameter corresponding to the matched type curve(4)Record the values of(5)Calculate permeability(6)Calculate CD(7)Calculate suOne inherent problem in type curve analysis is the difficulty in finding a unique match of the data.uThe data can be matched on more than one curve,so more than one solution is possible.uType curve should not be the primary analysis technique but should be used to complement to semilog analysis.Gas-well test analysis using type curvesGas-well test analysis using type curves(End)(End)