Leakage from drill pipe casing subject to shear deformation Online publication date: Sat, 26-Jul-2014
by Walter Gerstle; Tess McCarty-Glenn; Stephen F. Dwyer; John H. Gerstle
International Journal of Petroleum Engineering (IJPE), Vol. 1, No. 1, 2014
Abstract: The possibility of fluids leaking from a pressurised drill pipe casing subject to shear deformation caused by various events, including geological activity (such as seismic activity or deformations associated with subsidence related to excavation and construction) in the vicinity of the bore hole, is investigated. An experimental laboratory scoping investigation has been conducted to determine the potential for leakage from a pressurised drill pipe casing. The laboratory tests show that leakage from sheared casings is much more likely to occur in the neighbourhood of the threaded couplers than at locations far from couplers. With the caveat that the effects of surrounding rock and internal cement between concentric casings may not have been accurately simulated or characterised, the tests show that if a threaded coupler is located within a band of tectonic shear deformation, development of a leak at the location of the coupler is predictable.
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