ch10 - CHAPTER10 PropertiesofBlackOilsReservoir FluidStudies

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CHAPTER 10  Properties of Black Oils-Reservoir Properties of Black Oils-Reservoir     Fluid Studies Fluid Studies The five major tests and measurements normally  performed in the laboratory on black oil samples  are: Composition measurement Flash vaporization test Differential vaporization test Separator tests Oil viscosity measurement 10 - 1
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Sources of PVT Data 1.  Laboratory Measurements 2.  Correlations (Charts) 3.  Calculations using the principles of  thermodynamics, especially Equations of  State 10 - 2
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10 - 3
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Nomenclature for Flowing Well P e = pressure at external drainage  boundary P R = average reservoir pressure P sep1 = pressure of separator 1 P sep2 = pressure of separator 2 P th = tubinghead pressure P wf = flowing bottomhole pressure h = reservoir thickness k = reservoir permeability k s = permeability of damaged or  stimulated region r e = well’s drainage radius r s = radius of damaged or stimulated  region r w = wellbore radius T sep1 = temperature of separator 1 10 - 4
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T sep2 = temperature of separator 2 T R = reservoir temperature n 1 = total moles of well fluid entering  separator 1 n g1 = moles of gas from separator 1 n L1 = moles of liquid from separator 1 10 - 5
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Nomenclature for Flowing Well  (continued) n 2 = total moles of well fluid entering  separator 2 (Note that n 2  = n L1 ) n g2 = moles of gas from separator 2 n L2 = moles of liquid from separator 2 x i1 = composition of the liquid from  separator 1 x i2 = composition of the liquid from  separator 2 y i1 = composition of gas from  separator 1 y i2 = composition of gas from  separator 2 z i1 = total composition of well fluid  entering separator 1 10 - 6
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z i2 = total composition of fluid  entering separator 2 (Note  that z i2  = x i1 ) 10 - 7
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Sources of PVT Data (continued) Laboratory Measurements: Best source of PVT data. Costs money. Typically $20,000 to $30,000 per  fluid study. An example fluid study for a black oil reservoir is  presented in Chapter 10 of McCain. Special fluid studies for volatile oil and retrograde  condensate gas reservoirs are also available.  However, they are not discussed in McCain.  Sample reports are enclosed with these notes. 10 - 8
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(continued) Correlations: Not as accurate as laboratory measurements. Give approximate estimates. Should only be used  in the absence of laboratory measurements. Various correlations for estimating PVT properties  are presented in Chapter 11 of McCain. 10 -
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ch10 - CHAPTER10 PropertiesofBlackOilsReservoir FluidStudies

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