Lubricant additives are added to drilling fluids to lower the drag and torque between the drill
strings and rock formation. They impart lubricating properties into two moving surfaces …

Understanding the failure analysis of drillstring and its components ie, drill collar and drilling
bit is one of the essential issues in the oil and gas industry for the high cost of oil well drilling …

A new model depicting the full phase of tubular string buckling in vertical wellbores is
proposed. The buckling modes of the tubular string are divided into: no buckling, 2D lateral …

We develop a comprehensive geometrically-exact theory for an end-loaded elastic rod
constrained to deform on a cylindrical surface. By viewing the rod-cylinder system as a …

We develop a comprehensive, geometrically-exact theory for an end-loaded heavy rod
constrained to deform on a cylindrical surface. The cylinder can have arbitrary orientation …

This study presents a novel approach for optimizing well paths in extended reach drilling
(ERD) wells. Different trajectories can be used for ERD wells, each with its pros and cons …

The post-buckling behavior of a beam subjected to lateral constraints is of practical
importance in a variety of applications, such as stent procedures, filopodia growth in living …

The extended reach limit of coiled tubing (CT) in horizontal wellbores is an important factor
restricting the downhole engineering operations of unconventional oil and gas wells. This …

A new concept is proposed in the local tubular mechanical model, which provides a more-
sophisticated description of tubular mechanical behaviors from a local perspective. The …

In this paper, a set of partial differential equations considering the dynamic effects of the
coiled tubing (CT) is established based on the bending theory of slender beams considering …