Drilling Technology and Costs

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Drilling Technology and Costs ( drilling-technology-and-costs )

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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” $1,400 m / 21 6.5.4 Model input parameter sensitivities and drilling­cost breakdown Chapter 6 Table 6.2 Well­cost comparison of EGS with oil and gas. Costs shown are for completed through/perforated in­place casing. 6­23 The Wellcost Lite model was used to perform a parametric study to investigate the sensitivities of model inputs such as casing configuration, rate­of­penetration, and bit life. Well­drilling costs for oil, gas, and geothermal wells are subdivided into five elements: (i) pre­spud costs, (ii) casing and cementing costs, (iii) drilling­rotating costs, (iv) drilling­nonrotating costs, and (v) trouble costs. Pre­ spud costs include move­in and move­out costs, site preparation, and well design. Casing and cementing costs include those for materials and those for running casing and cementing it in place. Drilling­rotating costs are incurred when the bit is rotating, including all costs related to the rate­of­ penetration, such as bits and mud costs. Drilling­nonrotating costs are those costs incurred when the bit is not rotating, and include tripping, well control, waiting, directional control, supervision, and well evaluation. Unforeseen trouble costs include stuck pipe, twist­offs, fishing, lost circulation, hole­ stability problems, well­control problems, casing and cementing problems, and directional problems. Completed Well Costs (Millions of Year 2004 US$)

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