Systems and methods for torque and drag analysis of downhole systems

A system, comprising:

• at least one processor:
• memory in electronic communication with the at least one processor;
• and
• instructions stored thereon in the memory, the instructions being executable by the at least one processor to:
• receive wellbore data including a trajectory of a wellbore at a range of measurement depths of interest;
• receive drill string data for a drill string, the drill string data identifying components that make up the drill string, the components including a liner string and an inner string positioned inside of the liner string, the drill string data further identifying geometry and material properties of the components;
• solve a first single-layer finite element analysis (FEA) model for the inner string without the liner string, comprising:
• generate a virtual wellbore associated with the inner string based on an inner diameter of the liner string and based on the trajectory of the wellbore;
• constrain the virtual wellbore to be rigid and fixed along the trajectory of the wellbore;
• apply one or more inner boundary conditions for the inner string including constraining an uphole end of the inner string to be fixed with respect to the virtual wellbore;
• determine an inner axial force for the inner string based on a weight of the inner string;
• and
• determine, based on the trajectory of the virtual wellbore, a set of inner contact forces on the inner string at one or more locations where the inner string contacts the virtual wellbore;
• and
• solve a second single-layer FEA model for the liner string without the inner string, comprising:
• apply one or more liner boundary conditions to the liner string, including fixing the liner string at a top of the wellbore;
• apply a set of applied forces to the liner string, the set of applied forces including the inner axial force and a set of reaction forces corresponding to the set of inner contact forces on the inner string;
• and
• identify, based on the set of applied forces, a set of normal forces between the drill string and the wellbore;
• simulate a movement of the drill string in the wellbore to determine, using the set of normal forces, one or more axial frictional forces and one or more torsional frictional forces acting on the drill string during the movement of the drill string, the movement representing a wellbore operation including at least one of pulling the drill string out of the wellbore, advancing the drill string into the wellbore, or rotating the drill string within the wellbore;
• simulate axial tension of the drill string based on the one or more axial frictional forces;
• simulate torque of the drill string based on the one or more torsional frictional forces;
• identify, based on the drill string data, one or more working limits for one or more components of the components that make up the drill string;
• and
• predict whether the wellbore operation will cause the one or more working limits to be met or exceeded for the one or more components based on the axial tension and the torque.

A computer-readable storage medium including instructions that, when executed by at least one processor, cause the processor to:

• receive wellbore data including a trajectory of a wellbore at a range of measurement depths of interest;
• receive drill string data for a drill string, the drill string data identifying components that make up the drill string, the components including a liner string and an inner string positioned inside of the liner string, the drill string data further identifying geometry and material properties of the components;
• solve a first single-layer finite element analysis (FEA) model for the inner string without the liner string, comprising:
• generate a virtual wellbore associated with the inner string based on an inner diameter of the liner string and based on the trajectory of the wellbore;
• constrain the virtual wellbore to be rigid and fixed along the trajectory of the wellbore;
• apply one or more inner boundary conditions for the inner string including constraining an uphole end of the inner string to be fixed with respect to the virtual wellbore;
• determine an inner axial force for the inner string based on a weight of the inner string;
• and
• determine, based on the trajectory of the virtual wellbore, a set of inner contact forces on the inner string at one or more locations where the inner string contacts the virtual wellbore;
• and
• solve a second single-layer FEA model for the liner string without the inner string, comprising:
• apply one or more liner boundary conditions to the liner string, including fixing the liner string at a top of the wellbore;
• apply a set of applied forces to the liner string, the set of applied forces including the inner axial force and a set of reaction forces corresponding to the set of inner contact forces on the inner string;
• and
• identify, based on the set of applied forces, a set of normal forces between the drill string and the wellbore;
• wherein solving the first and second single-layer FEA models includes solving the first and second single-layer FEA models without solving a multilayer FEA model of the inner string and the liner string;
• simulate a movement of the drill string in the wellbore to determine, using the set of normal forces, one or more axial frictional forces and one or more torsional frictional forces acting on the drill string during the movement of the drill string, the movement representing a wellbore operation including at least one of pulling the drill string out of the wellbore, advancing the drill string into the wellbore, or rotating the drill string within the wellbore;
• simulate axial tension of the drill string based on the one or more axial frictional forces;
• simulate torque of the drill string based on the one or more torsional frictional forces;
• identify, based on the drill string data, one or more working limits for one or more components of the components that make up the drill string;
• and
• predict whether the wellbore operation will cause the one or more working limits to be met or exceeded for the one or more components based on the axial tension and the torque.