Page 8 - Formulas and Calculations for Petroleum Engineering

Chapter 1

Reservoir engineering formulas

and calculations

Chapter Outline
1.1 API gravity 3 1.31 Effective wellbore radius of a horizontal well—van
1.2 Average permeability for linear flow—Layered beds 3 der Vlis et al. method 16
1.3 Average permeability for linear flow—Series beds 4 1.32 Effective wellbore radius of a well in presence of
1.4 Average permeability for parallel-layered systems 4 uniform-flux fractures 16
1.5 Average permeability in radial systems 4 1.33 Effective wellbore radius to calculate slant well
1.6 Average temperature of a gas column 5 productivity—van der Vlis et al. 16
1.7 Calculation of fractional flow curve 5 1.34 Estimation of average reservoir pressure—MDH
1.8 Capillary number 6 method 17
1.9 Capillary pressure 6 1.35 Formation temperature for a given gradient 17
1.10 Characteristic time for linear diffusion in reservoirs 6 1.36 Fraction of the total solution gas retained in the
1.11 Cole plot 7 reservoir as free gas 17
1.12 Communication between compartments in tight gas 1.37 Fractional gas recovery below the critical
reservoirs 7 desorption pressure in coal bed methane reservoirs 18
1.13 Communication factor in a compartment in tight gas 1.38 Free gas in place 18
reservoirs 7 1.39 Gas adsorbed in coal bed methane reservoirs 19
1.14 Compressibility drive in gas reservoirs 8 1.40 Gas bubble radius 19
1.15 Correction factor—Hammerlindl 8 1.41 Gas cap ratio 19
1.16 Critical rate for horizontal wells in edge-water drive 1.42 Gas cap shrinkage 20
reservoirs 8 1.43 Gas drive index in gas reservoirs 20
1.17 Crossflow index 9 1.44 Gas expansion factor 20
1.18 Cumulative effective compressibility—Fetkovich 10 1.45 Gas expansion term in gas reservoirs 21
1.19 Cumulative gas production—Tarner’s method 10 1.46 Gas flow rate into the wellbore 21
1.20 Cumulative oil production—Undersaturated oil 1.47 Gas flow under laminar viscous conditions 22
reservoirs 11 1.48 Gas formation volume factor 22
1.21 Deliverability equation for shallow gas reservoirs 11 1.49 Gas hydrate dissociation pressure 22
1.22 Dimensionless pressure—Kamal and Brigham 11 1.50 Gas material balance equation 23
1.23 Dimensionless radius of radial flow—Constant-rate 1.51 Gas produced by gas expansion 23
production 12 1.52 Gas saturation—Water-drive gas reservoirs 24
1.24 Dimensionless time—Myhill and Stegemeier’s method 12 1.53 Gas solubility in coalbed methane reservoirs 24
1.25 Dimensionless time for interference testing in 1.54 Geertsma’s model for porosity/transit-time
homogeneous reservoirs—Earlougher 13 relationship 25
1.26 Dimensionless vertical well critical rate 1.55 Geothermal gradient 25
correlations—Hoyland, Papatzacos, 1.56 Hagen Poiseuille equation 26
and Skjaeveland 13 1.57 Hagoort and Hoogstra gas flow in tight reservoirs 26
1.27 Dimensionless wellbore storage coefficient of 1.58 Hammerlindl method for gas in place 26
radial flow—Constant-rate production 13 1.59 High-pressure region gas flow rate 27
1.28 Effective compressibility in undersaturated oil 1.60 Horizontal well breakthrough time—With gas cap
reservoirs—Hawkins 14 or bottom water 27
1.29 Effective wellbore radius of a horizontal 1.61 Horizontal well critical rate correlation—Chaperon 28
well—Method 1—Anisotropic reservoirs 14 1.62 Horizontal well critical rate correlations—Efros 28
1.30 Effective wellbore radius of a horizontal 1.63 Horizontal well critical rate correlations—Giger
well—Method 1—Isotropic reservoirs 15 and Karcher 29

Formulas and Calculations for Petroleum Engineering. https://doi.org/10.1016/B978-0-12-816508-9.00001-9
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