Fatigue Damage Analysis of Drill Pipes Using FEM and Cox Regression Model

Khalil Farhangdoost; Mehran Siahpoosh

doi:10.4028/www.scientific.net/KEM.326-328.1169

Paper Titles

Modeling of Filtration for a Metal Foam Diesel Particulate Filter
p.1153

The Effect of Temperature and Sizes on Deformation of Cantilever Rectangular Plate with Double Layer
p.1157

Experimental Study on the Film Cooling Performance at the Leading Edge of Turbine Blade Using Infrared Thermography
p.1161

Investigation of Local Failure Criteria of Wall-Thinned Area by Simulated Specimen Tests
p.1165

Fatigue Damage Analysis of Drill Pipes Using FEM and Cox Regression Model
p.1169

Evaluation of Thermal Fatigue Properties of Surface Treated AISI H13 Steel for Aluminum Die-Casting
p.1173

Microstructure and Damage Evolution of Ceramic Matrix Composite
p.1177

Effect of Surface Treatment on the Life of AISI H13 Steel Core Pin for Die-Casting
p.1181

Experimental Investigation on Friction and Wear of Coated Vane under the Environments of Lubricants and CO₂ as a Refrigerant
p.1185

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Fatigue Damage Analysis of Drill Pipes Using FEM and Cox Regression Model

Abstract:

Drill pipe fatigue damage occurs under cyclic loading conditions due to, for instance, rotation in a dogleg region. This paper presents two approaches to evaluate damage in drillpipes; First, Finite Element Method is used to evaluate cumulative effects of fatigue damage with respect to the actual drilling conditions and the fatigue damage curves for smooth and die-marked drill pipes are obtained. Second, as a case study, the Cox Regression Model, a broadly applicable method of survival analysis is used to analyze the failure data of the southern oilfields of Iran. The resultant cumulative survival and hazard functions can reliably predict the time of failure.