Page 9 - Formulas and Calculations for Petroleum Engineering

2 Formulas and calculations for petroleum engineering

1.64 Horizontal well critical rate correlations—Joshi 1.108 Porosity determination—IES and FDC logs 47
method for gas coning 29 1.109 Produced gas-oil ratio 47
1.65 Hydrocarbon pore volume occupied by evolved 1.110 Productivity index for a gas well 48
solution gas 30 1.111 Pseudo-steady state productivity of horizontal
1.66 Hydrocarbon pore volume occupied by gas cap 30 wells—Method 1 48
1.67 Hydrocarbon pore volume occupied by remaining oil 31 1.112 Pseudo-steady state productivity of horizontal
1.68 Hydrostatic pressure 31 wells—Method 2 49
1.69 Incremental cumulative oil production in 1.113 Pseudo-steady state productivity of horizontal
undersaturated reservoirs 31 wells—Method 3 50
1.70 Ineffective porosity 32 1.114 Pseudo-steady state radial flow equation 50
1.71 Initial gas cap 32 1.115 Relative permeability—Corey exponents 51
1.72 Initial gas in place for water-drive gas reservoirs 32 1.116 Remaining gas in place in coalbed methane
1.73 Injectivity index 33 reservoirs 51
1.74 Instantaneous gas-oil ratio 33 1.117 Roach plot for abnormally pressured gas reservoirs 52
1.75 Interporosity flow coefficient 34 1.118 Rock expansion term in abnormally pressured gas
1.76 Interstitial velocity 34 reservoirs 52
1.77 Isothermal compressibility of oil—Vasquez-Beggs 1.119 Shape factor—Earlougher 52
correlation—p > pb 34 1.120 Solution gas oil ratio—Beggs-Standing
1.78 Isothermal compressibility of oil—villena-Lanzi correlation—p < pb 53
correlation—p < pb 35 1.121 Solution gas oil ratio—Standing’s correlation 53
1.79 Isothermal compressibility of water—Osif correlation 35 1.122 Solution gas water ratio 54
1.80 Kerns method for gas flow in a fracture 35 1.123 Somerton method for formation permeability in
1.81 Klinkenberg gas effect 36 coalbed methane reservoirs 54
1.82 Kozeny equation 36 1.124 Specific gravity of gas hydrate forming components 54
1.83 Kozeny-Carman relationship 36 1.125 Time to reach the semi-steady state for a gas well
1.84 Leverett J-function 37 in a circular or square drainage area 55
1.85 Line-source solution for damaged or stimulated 1.126 Time to the end of infinite-acting period for a well
wells 37 in a circular reservoir 55
1.86 Low-pressure region gas flow rate for non-circular 1.127 Torcaso and Wyllie’s correlation for relative
drainage area 38 permeability ratio prediction 55
1.87 Material balance for cumulative water 1.128 Total compressibility 56
influx—Havlena and Odeh 38 1.129 Total pore volume compressibility 56
1.88 Maximum height of oil column in cap rock 39 1.130 Transmissibility between compartments 57
1.89 Modified Cole plot 39 1.131 Transmissibility of a compartment 57
1.90 Modified Kozeny-carman relationship 39 1.132 Transmissivity 57
1.91 Normalized saturation 40 1.133 Trapped gas volume in water-invaded zones 58
1.92 Oil bubble radius of the drainage area of each well 1.134 Two-phase formation volume factor 58
represented by a circle 40 1.135 Underground fluid withdrawal—Havlena and Odeh 59
1.93 Oil density—Standing’s correlation 41 1.136 Vertical well critical rate correlations—Craft
1.94 Oil formation volume factor—Standing’s correlation 41 and Hawkins method 59
1.95 Oil formation volume factor—Beggs-standing 1.137 Vertical well critical rate correlations—Hoyland,
correlation—p < pb 41 Papatzacos, and Skjaeveland—Isotropic reservoirs 60
1.41 Oil formation volume factor—Beggs-standing 1.138 Vertical well critical rate correlations—Meyer,
correlation—p > pb 42 Gardner, and Pirson—Simultaneous gas and water
1.42 Oil in place for undersaturated oil reservoirs coning 60
without fluid injection 42 1.139 Vertical well critical rate correlations—Meyer,
1.98 Oil in place in saturated oil reservoirs 43 Gardner, and Pirson—Water coning 61
1.99 Oil lost in migration 43 1.140 Vertical well critical rate correlations—Meyer,
1.100 Oil saturation at any depletion state below the Gardner, and Pirson—Gas coning 61
bubble point pressure 44 1.141 Viscosibility 62
1.101 Original gas in place 44 1.142 Viscosity of crude oil through API 62
1.102 Payne method for intercompartmental flow in 1.143 Viscosity of dead oil—Standing’s correlation 62
tight gas reservoirs 44 1.144 Viscosity of dead-oil—Egbogah correlation—p < pb 63
1.103 Performance coefficient for shallow gas reservoirs 45 1.145 Viscosity of live oil—Beggs/Robinson correlation 63
1.104 Poisson’s ratio 45 1.146 Viscosity of oil—Vasquez/Beggs correlation—p > pb 63
1.105 Pore throat sorting 46 1.147 Viscosity of water at atmospheric pressure—McCain
1.106 Pore volume occupied by injection of gas and water 46 correlation 64
1.107 Pore volume through squared method in tight gas 1.148 Viscosity of water at reservoir pressure—McCain
reservoirs 46 correlation 64