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Drilling Technology and Costs 6.1 ScopeandApproach __________________________________63 6.2 ReviewofGeothermalDrillingTechnology ____________________64 6.2.1 Early geothermal/EGS drilling development _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _64 6.2.2 Current EGS drilling technology _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _65 ix 6.3 HistoricalWellCostData _______________________________68 6.3.1 General trends in oil and gas wellcompletion costs _ _ _ _ _ _ _ _ _ _ _ _ _ _69 6.3.2 MIT Depth Dependent (MITDD) drillingcost index _ _ _ _ _ _ _ _ _ _ _ _ _ _ _612 6.3.3 Updated geothermal well costs _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _617 6.4 Predicting Geothermal Well Costs with the Wellcost Lite Model _ _ _ _ _ _618 6.4.1 History of the Wellcost Lite model _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _618 6.4.2 Wellcost Lite model description _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _619 6.5 DrillingCostModelValidation ___________________________619 6.5.1 Basecase geothermal wells _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _619 6.5.2 Comparison with geothermal wells _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _622 6.5.3 Comparison with oil and gas wells _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _622 6.5.4 Model input parameter sensitivities and drillingcost breakdown _ _ _ _ _ _ _623 6.6 EmergingDrillingTechnologies __________________________627 6.6.1 Current oil and gas drilling technologies adaptable to EGS _ _ _ _ _ _ _ _ _ _627 6.6.2 Revolutionary drilling technologies _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _628 6.7 Conclusions _______________________________________629 References ___________________________________________631 CHAPTER 6 Appendices _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _633 A.6.1 WellCost Data _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _633 A.6.2 Wellcost Lite Model _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _637 A.6.2.1 Background and brief history of the development of Wellcost Lite _ _ _ _ _ _637 A.6.2.2 Wellcost Lite – How does the cost model work? _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _637 A.6.3 Model Results for Specific Areas and Depths _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _649 A.6.4 Model Results for Reworked Wells _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _651 A.6.4.1 Rig on drilling/deepening 460 m (1,500 ft)/rig still on the well _ _ _ _ _ _ _ _651 A.6.4.2 Rig on drilling/sidetracked lateral/as a planned part of the well design _ _ _651 A.6.4.3 Reworks/rig has to be mobilized/add a lateral for production maintenance/a workover _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _651 A.6.4.4 Redrills to enhance production/a workover/rig to be mobilized _ _ _ _ _ _ _651PDF Image | The Future of Geothermal Energy
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