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Volume 4 Issue 4
Dec.  2016
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ZHANG Pei-feng. 2016: Thermal stresses analysis of casing string used in enhanced geothermal systems wells. Journal of Groundwater Science and Engineering, 4(4): 293-300.
Citation: ZHANG Pei-feng. 2016: Thermal stresses analysis of casing string used in enhanced geothermal systems wells. Journal of Groundwater Science and Engineering, 4(4): 293-300.

Thermal stresses analysis of casing string used in enhanced geothermal systems wells

  • Publish Date: 2016-12-28
  • In the enhanced geothermal systems wells, casing temperature variation produces casing thermal stresses, resulting in casing uplift or bucking. When the induced thermal stresses exceed casing material’s yield strength, the casing deforms and collapses. The traditional casing design standard only considers the influence of temperature variation on casing material’s yield strength. Actually, for commonly used grades of steel pipe, casing’s material properties-such as yield strength, coefficient of thermal expansion, and modulus of elasticity change with temperature variation. In this paper, the modified thermal stress equation is given. Examples show that the allowable temperature of the material grade N80’s casing is only 164 ℃, which is much lower than that of the traditional design standard. The effective method to improve the casing pipe’s allowable temperature is pre-stressed cementing technology. Pre-stressed cementing includes pre-tension stress cementing and pre-pressure stress cementing. This paper focuses on the design method of full casing pre-tension stress cementing and the ground anchor full casing string pre-tension cementing construction process.
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