Page 180 - Formulas and Calculations for Petroleum Engineering

Chapter 3

Well test analysis formulas and calculations

Chapter Outline
3.1 Analysis of a flow test with smoothly varying rates 174 3.27 Dimensionless rate (radial flow/constant pressure
3.2 Analysis of a post-fracture—Constant-rate flow test production) 187
with boundary effects 174 3.28 Dimensionless shut-in time for MDH method 188
3.3 Analysis of a post-fracture pressure buildup test with 3.29 Dimensionless storage constant for gases 188
wellbore-storage distortion 175 3.30 Dimensionless storage constant for liquids 188
3.4 Analysis of a well from a PI test 176 3.31 Dimensionless time (linear flow/constant rate
3.5 Analysis of DST flow data with Ramey type curves 177 production/general case) 189
3.6 Average fracture permeability (pseudo-steady state 3.32 Dimensionless time (linear flow/constant rate
case for pressure build-up test) 178 production/hydraulically fractured wells) 189
3.7 Bottomhole flowing pressure during infinite-acting 3.33 Dimensionless time (radial flow/constant
pseudoradial flow 178 rate production) 190
3.8 Calculation of pressure beyond the wellbore 3.34 Dimensionless time function (transient heat
(line-source solution) 179 transfer to the formation) 190
3.9 Conventional DST design without a water cushion 3.35 Dimensionless wellbore storage coefficient
(collapse pressure calculation) 179 (compressible fluids for pressure build-up test) 191
3.10 Diffusion depth in a geothermal well 180 3.36 Flow period duration (hydraulically fractured wells) 191
3.11 Dimensionless buildup pressure for field calculations 180 3.37 Fracture conductivity (bilinear-flow regime in
3.12 Dimensionless buildup pressure for liquid flow 180 gas wells) 191
3.13 Dimensionless buildup pressure for steam or gas flow 181 3.38 Fracture conductivity during bilinear flow 192
3.14 Dimensionless buildup time 181 3.39 Inflow performance relationship (IPR) for horizontal
3.15 Dimensionless cumulative production (radial flow wells in solution gas-drive reservoirs (Fetkovich) 192
constant-pressure production) 182 3.40 Inflow performance relationship (IPR) for horizontal
3.16 Dimensionless drawdown correlating parameter wells in solution gas-drive reservoirs (Vogel) 193
by carter 182 3.41 Interporosity flow coefficient in pressure build-up test 193
3.17 Dimensionless length (linear flow constant rate 3.42 Minimum shut-in time to reach pseudo-steady state
production/hydraulically fractured wells) 183 for tight gas reservoirs being hydraulically fractured 194
3.18 Dimensionless length (linear flow/constant-rate 3.43 Permeability and reservoir pressure from buildup tests 194
production/general case) 183 3.44 Permeability and skin factor from a constant-rate
3.19 Dimensionless pressure (linear flow/constant rate flow test 195
production/general case) 183 3.45 Pressure buildup equation (Horner equation) 196
3.20 Dimensionless pressure (linear flow/constant rate 3.46 Radius of investigation 196
production/hydraulically fractured wells) 184 3.47 Radius of investigation (flow time) 196
3.21 Dimensionless pressure (radial-flow/constant 3.48 Radius of investigation (shut-in time) 197
pressure production) 184 3.49 Raymer hunt transform (porosity/transit time
3.22 Dimensionless pressure (radial-flow/constant rate relationship) 197
production) 185 3.50 Reservoir permeability 198
3.23 Dimensionless pressure drop across a skin at the 3.51 Shut-in time for pressure build-up test
well face 185 (Dietz method) 198
3.24 Dimensionless pressure drop during pseudo-steady 3.52 Skin during infinite-acting pseudoradial flow for
state flow for a fractured vertical well in a square vertical wells 199
drainage area 186 3.53 Skin estimation type-1 (pressure buildup test) 199
3.25 Dimensionless pressure drop during pseudo-steady 3.54 Slope of Horner plot in pressure buildup test 200
state flow for a horizontal well in a bounded reservoir 186 3.55 Slope of pseudo-steady state flow in pressure
3.26 Dimensionless production time 187 buildup test 200

Formulas and Calculations for Petroleum Engineering. https://doi.org/10.1016/B978-0-12-816508-9.00003-2
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