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20 18 16 14 12 10 Habanero-2 Drilling Technology and Costs Wellcost Lite Predictions – Base Case Well Costs Wellcost Lite Predictions – Actual Well Real Life Trouble Free Well Costs – Actual Wells Cooper Basin 8642 Rosemanowes Soultz GPK4 0 0 2000 4000 6000 8000 10000 Depth (meters) Figure 6.8 EGS wellcost predictions from the Wellcost Lite model and historical geothermal well costs, at various depths. Well type Depth Production casing size Final bit diameter Cost/days of drilling EGS 2,500 m (8,200 ft) 11 3/4” 10 5/8” $3,400 m / 43 Oil / Gas average 2,500 m (8,200 ft) 8 5/8” 6 3/4” $1,800 m / 29 Oil / Gas Slim Hole 2,500 m (8,200 ft) 5 1/2” 6 3/4” $1,400 m / 21 6.5.4 Model input parameter sensitivities and drillingcost breakdown Chapter 6 Table 6.2 Wellcost comparison of EGS with oil and gas. Costs shown are for completed through/perforated inplace casing. 623 The Wellcost Lite model was used to perform a parametric study to investigate the sensitivities of model inputs such as casing configuration, rateofpenetration, and bit life. Welldrilling costs for oil, gas, and geothermal wells are subdivided into five elements: (i) prespud costs, (ii) casing and cementing costs, (iii) drillingrotating costs, (iv) drillingnonrotating costs, and (v) trouble costs. Pre spud costs include movein and moveout costs, site preparation, and well design. Casing and cementing costs include those for materials and those for running casing and cementing it in place. Drillingrotating costs are incurred when the bit is rotating, including all costs related to the rateof penetration, such as bits and mud costs. Drillingnonrotating costs are those costs incurred when the bit is not rotating, and include tripping, well control, waiting, directional control, supervision, and well evaluation. Unforeseen trouble costs include stuck pipe, twistoffs, fishing, lost circulation, hole stability problems, wellcontrol problems, casing and cementing problems, and directional problems. Completed Well Costs (Millions of Year 2004 US$)PDF Image | Drilling Technology and Costs
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