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11108 Corrosion Fatigue Performance of High Strength Drill Pipe in Sour Environments

Product Number: 51300-11108-SG
ISBN: 11108 2011 CP
Author: T. Ramgopal, Feng Gui, Jeff Hawk, Margaret Ziomek-Moroz
Publication Date: 2011
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$20.00
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Increasing demand for oil and gas has lead to exploration and drilling conditions getting harsher and there is a greater demand for high strength materials to increase the strength to weight ratio, there have been developments in the area of low alloy steels with strengths as high as 165ksi. The combination of fatigue stresses in the presence of sour conditions clearly has an important effect on the design and operating regimes of the drill pipes. This paper discusses the impact of pH, H2S concentration and temperature on the fatigue crack growth behavior of a high strength steel used for drill pipes. The fatigue crack growth measured at a constant stress intensity factor (DK) and at varying frequencies from 1Hz to 1mHz is presented. The role of corrosion products in creating crack closure effects in environments containing high H2S concentrations is discussed.
Increasing demand for oil and gas has lead to exploration and drilling conditions getting harsher and there is a greater demand for high strength materials to increase the strength to weight ratio, there have been developments in the area of low alloy steels with strengths as high as 165ksi. The combination of fatigue stresses in the presence of sour conditions clearly has an important effect on the design and operating regimes of the drill pipes. This paper discusses the impact of pH, H2S concentration and temperature on the fatigue crack growth behavior of a high strength steel used for drill pipes. The fatigue crack growth measured at a constant stress intensity factor (DK) and at varying frequencies from 1Hz to 1mHz is presented. The role of corrosion products in creating crack closure effects in environments containing high H2S concentrations is discussed.
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