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$9,000 Pre-spud Expenses Casing and Cementing Drilling-Rotating Drilling-Non-rotating Trouble Drilling Technology and Costs $8,000 $7,000 $6,000 $5,000 $4,000 $3,000 $2,000 $1,000 $0 Chapter 6 0 2000 4000 6000 8000 10000 12000 Number of Casing Strings. A greater number of casing strings results in higher predicted drilling costs. It is not just the direct cost of additional strings that has an effect; there are also costs that occur because of welldiameter constraints. For example, to maintain a 9 5/8” completion diameter – which may be required to achieve flow rates suitable for electric power production – the surface casing in a 10,000 mdeep EGS well must have a diameter of 42”. The ability to handle this large casing size requires more expensive rigs, tools, pumps, compressors, and wellhead control equipment. The relationship between the number of casing strings and completed well costs is shown in Figure 6.10. Increasing the number of casing strings from four to five in the 5,000 mdeep well results in an 18.5% increase in the total predicted well cost. An increase in the number of casing strings from five to six in the 6,000 mdeep well results in a 24% increase in total cost. As the number of casing strings increases, the rate at which drilling costs increase with depth also increases. Depth (meters) Figure 6.9 Breakdown of drilling cost elements as a function of depth from Wellcost Lite model results. 625 Cost per Well (Thousands of US$)PDF Image | Drilling Technology and Costs
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