Mechanical Behavior and Failure Mechanism of Solid Expandable Tubular Crossing Active Strike-Slip Fault.

Fault slip will directly affect the technical performance of solid expandable tubular (SET). However, there are few researches on the mechanical behavior of shear failure when SET crosses the slip fault. In response to the above problems, this paper builds a three-dimensional dynamic tube-rock system numerical model that considers nonlinear frictional contact and fault slip based on the SET material constitutive model, Coulomb friction, and shale layer rock. The purpose is to reveal the influence of fault slip on the mechanical behavior of SET and to analyze the risk point of SET failure. The results of the study show that as the amount of fault slip increases, the maximum value of the Mises stress of SET appears in the direction perpendicular to the amount of fault slip (90°). With the increase in the number of faults, the shear stress distribution on the cross section hardly changes, and the shear stress distribution on the fault plane presents a "8" shape. When the included angle is 60°, the shear stress on the shear plane is the largest and the shear distribution is the most uneven. The research results of this paper provide a theoretical basis for the slip shear of SET. [ABSTRACT FROM AUTHOR]