Calibration of drillstring weight with drag for friction factor estimation

One or more non-transitory machine-readable media comprising program code for drillstring weight calibration, the program code to:

• determine a value of at least one oppositional force for a drillstring at multiple depths in a wellbore, wherein the at least one oppositional force includes a centralizer friction force based on the presence of one or more centralizers positioned within the wellbore;
• determine a value of hook load for the drillstring at the multiple depths in the wellbore based at least in part on the value of the at least one oppositional force;
• determine a calibrated drillstring weight based on a change of the value of hook load for the drillstring over the multiple depths in the wellbore;
• determine a friction factor based on the calibrated drillstring weight;
• and
• control one or more drilling operations performed on the wellbore based at least in part on the friction factor.

An apparatus comprising:

• a processor;
• and
• a non-transitory machine-readable medium having program code executable by the processor to cause the apparatus to,
• determine a first value of at least one oppositional force for a drillstring at a first depth in a wellbore, wherein the at least one oppositional force includes a centralizer friction force based on the presence of one or more centralizers positioned within the wellbore at the first depth;
• determine a first value of hook load for the drillstring at the first depth in the wellbore based on the first value of the at least one oppositional force at the first depth
• determine a second value of the at least one oppositional force for the drillstring at a second depth in the wellbore, wherein the at least one oppositional force includes a centralizer friction force based on the presence of one or more centralizers positioned within the wellbore at the second depth;
• determine a second value of hook load for the drillstring at the second depth in the wellbore based on the second value of the at least one oppositional force at the second depth;
• determine a first calibrated drillstring weight based on a difference between the first value of hook load and the second value of hook load;
• determine a friction factor based on the first calibrated drillstring weight;
• and
• control one or more drilling operations performed on the wellbore based at least in part on the friction factor.