The factors contributing to casing wear by the action

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Unformatted text preview: unning time for a 40 feet joint of casing is 15 seconds. Substituting gives (Eq.28) Fspeak=2(1.04×103)WN(40/15) & Fs peak=5,547WN Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 106 Casing Wear Casing wear occurs when energy in the drill string is transferred by motion to the casing. The factors contributing to casing wear by the action of the drill string are: 1. The relative hardness of the drill string component to the casing. 2. The bearing load exerted by the drill string on the casing. 3. The relative rate of motion between the drill string and casing. 4. The relative roughness and abrasiveness of the drill string component in contact with the casing. 5. The area of contact between the drill string component and the casing. 213 Drillstring and Casing Hardness Comparison If the drillstring component exhibits a hardness greater than the casing, casing wear will result from any direct energy transfer. The design requirements for both the drillstring and casing dictate the characteristics, incl...
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