Optimization of well pad design and drilling - well clustering

ABRAMOV Aleksandr

Table 1 Technical and economic parameters of the model.

Classifi- cation Technical and economic parameter Value Landfill design and construction parameters Distance between wells 5 m Distance between groups of wells 15 m Distance from the first and the last wells of a pad to the landfill border 80 m Landfill width 75 m Landfill height 2 m Landfill construction speed 600 m3/d Drilling rig mobilization time 30 d Landfill specific cost 167 USD/m3 Fixed cost of pad construction 1.7×106 USD Drilling and completion parameters *Well drilling time 30 d *Well completion time 20 d *Well drilling cost 0.83×106 USD *Well completion cost 0.5×106 USD Drilling rig short shift duration 1 d Drilling rig long shift duration 2 d Drilling rig demobilization time 10 d Drilling rig short shift cost 28333 USD Drilling rig long shift cost 43333 USD Drilling rig demobilization cost 166667 USD Technological parameters of wells *Initial oil flow rate 20, 50, 90 t/d *Oil production decline rate 25%, 40%, 45%, 50%, 60%, 70% *Initial water cut 1% *Liquid production increment 0.3% * Water cut at well shut-in 90% *Oil density 850 kg/m3 *Water density 1010 kg/m3 Economic parameters Price of oil 200 USD/t Specific operational expenditures (liquid based) 16.7 USD/m3 Discount rate 10%, 15%, 20% Time step 1 d Modeling period 20 a