Vector-ratio safety factors for wellbore tubular design

A system for determining vector-ratio safety factors for wellbore tubular design, the system comprising:

• at least one processor;
• and
• a memory coupled to the processor having instructions stored therein, which when executed by the processor, cause the processor to perform functions including functions to:
• obtain pressure and temperature data for at least one load point along a tubular component of a wellbore;
• calculate an effective failure axial load expected at the load point during a downhole operation to be performed along one or more sections of the wellbore within a subsurface formation, based on the obtained pressure and temperature data;
• determine an upper boundary and a lower boundary for the effective failure axial load, based on physical properties of the tubular component at the load point;
• calculate a midpoint of the effective failure axial load based on the upper and lower boundaries;
• calculate a critical failure differential pressure corresponding to a collapse resistance of the tubular component, based on the midpoint of the effective failure axial load;
• calculate a vector-ratio safety factor for the tubular component, based on the critical failure differential pressure relative to the effective failure axial load;
• select one of a plurality of designs for the tubular component based on the vector-ratio safety factor;
• and
• perform the downhole operation using the selected design of the tubular component along the one or more sections of the wellbore.

A non-transitory computer-readable storage medium having instructions stored therein, which when executed by a computer cause the computer to perform a plurality of functions, including functions to:

• obtain pressure and temperature data for at least one load point along a tubular component of a wellbore;
• calculate an effective failure axial load expected at the load point during a downhole operation to be performed along one or more sections of the wellbore within a subsurface formation, based on the obtained pressure and temperature data;
• determine an upper boundary and a lower boundary for the effective failure axial load, based on physical properties of the tubular component at the load point;
• calculate a midpoint of the effective failure axial load based on the upper and lower boundaries;
• calculate a critical failure differential pressure corresponding to a collapse resistance of the tubular component, based on the midpoint of the effective failure axial load;
• calculate a vector-ratio safety factor for the tubular component, based on the critical failure differential pressure relative to the effective failure axial load;
• select one of a plurality of designs for the tubular component based on the vector-ratio safety factor;
• and
• perform the downhole operation using the selected design of the tubular component along the one or more sections of the wellbore.