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Casing and tubing costs are significant factors in the well cost that must be properly estimated in the [[Authority for expenditures (AFE)|authority for expenditure]] (AFE). In some cases, they may account for 50 to 60% of the total expenditures. The costs are dependent on well depth, size, grade requirements, and couplings. | Casing and tubing costs are significant factors in the well cost that must be properly estimated in the [[Authority for expenditures (AFE)|authority for expenditure]] (AFE). In some cases, they may account for 50 to 60% of the total expenditures. The costs are dependent on well depth, size, grade requirements, and couplings. <math>{\partial^2\over\partial x_1\partial x_2}y</math> | ||
==Pipe costs== | ==Pipe costs== | ||
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Pipe costs are influenced heavily by several factors. Pipe size is a major consideration. '''Fig. 1''' illustrates cost variations according to pipe size for N-80 grade long-thread and coupling (LTC) pipe that exceeds a burst rating of 5,000 psi in several sizes. Although engineering considerations should have the major impact on the pipe size selection, cost considerations should have some influence. | Pipe costs are influenced heavily by several factors. Pipe size is a major consideration. '''Fig. 1''' illustrates cost variations according to pipe size for N-80 grade long-thread and coupling (LTC) pipe that exceeds a burst rating of 5,000 psi in several sizes. Although engineering considerations should have the major impact on the pipe size selection, cost considerations should have some influence. | ||
<gallery widths=300px heights=200px> | <gallery widths="300px" heights="200px"> | ||
File:Devol2 1102final Page 515 Image 0001.png|'''Fig. 1—Pipe size vs. cost.''' | File:Devol2 1102final Page 515 Image 0001.png|'''Fig. 1—Pipe size vs. cost.''' | ||
</gallery> | </gallery> | ||
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Costs increase with higher pipe grades. '''Table 1''' shows costs for 40.0-lbm/ft., 9.625-in. pipe with LTC couplings. As in the case of the pipe sizes, however, pipe-grade selection is an engineering decision. Couplings are seldom selected as a result of costs. However, higher-price premium couplings may allow the use of smaller pipe sizes, which will reduce the overall well costs ('''Table 2'''). | Costs increase with higher pipe grades. '''Table 1''' shows costs for 40.0-lbm/ft., 9.625-in. pipe with LTC couplings. As in the case of the pipe sizes, however, pipe-grade selection is an engineering decision. Couplings are seldom selected as a result of costs. However, higher-price premium couplings may allow the use of smaller pipe sizes, which will reduce the overall well costs ('''Table 2'''). | ||
<gallery widths=300px heights=200px> | <gallery widths="300px" heights="200px"> | ||
File:Devol2 1102final Page 515 Image 0002.png|'''Table 1-Casing Cost Comparisons By Pipe Grade*''' | File:Devol2 1102final Page 515 Image 0002.png|'''Table 1-Casing Cost Comparisons By Pipe Grade*''' | ||
File:Devol2 1102final Page 516 Image 0001.png|'''Table 2-Coupling Cost Comparison*''' | File:Devol2 1102final Page 516 Image 0001.png|'''Table 2-Coupling Cost Comparison*''' | ||
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Casing (or cementing) accessory equipment is used to accomplish an effective primary cement job. Although the equipment does not have a major impact on well costs, it should be considered. '''Table 3''' shows a typical suite of equipment requirements for running and cementing casing. This equipment would cost approximately U.S. $3,500 for a 7⅝-in. casing string and U.S. $25,000 for a 7⅝-in. liner. | Casing (or cementing) accessory equipment is used to accomplish an effective primary cement job. Although the equipment does not have a major impact on well costs, it should be considered. '''Table 3''' shows a typical suite of equipment requirements for running and cementing casing. This equipment would cost approximately U.S. $3,500 for a 7⅝-in. casing string and U.S. $25,000 for a 7⅝-in. liner. | ||
<gallery widths=300px heights=200px> | <gallery widths="300px" heights="200px"> | ||
File:Devol2 1102final Page 516 Image 0002.png|'''Table 3-Equipment Requirements For Running And Cementing Casing''' | File:Devol2 1102final Page 516 Image 0002.png|'''Table 3-Equipment Requirements For Running And Cementing Casing''' | ||
</gallery> | </gallery> | ||
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Drive-pipe costs must be calculated for wells that utilize the pipe. The charges vary for pipe sizes and wall thickness. A drive-shoe cost must be included. Typical drive-pipe size and costs are given in '''Table 4'''. | Drive-pipe costs must be calculated for wells that utilize the pipe. The charges vary for pipe sizes and wall thickness. A drive-shoe cost must be included. Typical drive-pipe size and costs are given in '''Table 4'''. | ||
<gallery widths=300px heights=200px> | <gallery widths="300px" heights="200px"> | ||
File:Devol2 1102final Page 516 Image 0003.png|'''Table 4-Typical Drive-Pipe Size And Costs''' | File:Devol2 1102final Page 516 Image 0003.png|'''Table 4-Typical Drive-Pipe Size And Costs''' | ||
</gallery> | </gallery> | ||
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== External links == | == External links == | ||
[[Category:1.1.2 Authority for expenditures (AFE)]] [[Category:NR]] | [[Category:1.1.2 Authority for expenditures (AFE)]] | ||
[[Category:NR]] | |||
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