Well intervention in long lateral-reach wells, ie, wells with laterals 10,000-ft or longer, is
predicted to become more common within the current low price oil environment. During …

Prediction of drill strings buckling load has been a challenge to the drilling industry. This
work attempts to review most of the research performed in the previous years. First …

Motor Steerable (MS) assemblies are used globally in the majority of directional drilling
applications. However, the limitations of MS systems are often highlighted as well paths …

Hydraulic oscillator tool (HOT) is an effective means to solve the problem of over-high drag
that encountered in the complex-structure well during sliding drilling. However, when the …

Axial force transfer is an issue in deviated wells where friction and buckling phenomenon
take place. The general perception of the industry is that once drill pipe exceeds …

The main purpose of this work was to experimentally test the impact of modification to the
tangential contact stiffness of the friction pair, caused by changing the kind of material …

There are some problems in coiled tubing drilling in deep horizontal sections, such as large
buckling friction and difficult extension drilling. To solve this problem, the double vortex …

Axial excitation tools (AETs) have the ability to improve slide-drilling efficiency by reducing
the friction between the drillstring and the wellbore wall. However, drag-reduction effects are …

The work examines the effects of frequencies of vibrations at different amplitudes on friction
force, axial force transfer, and lock-up force of buckled rod constrained in a horizontal …

Activating drill string vibration is an effective means to mitigate the excessive drag
encountered during drilling complex‐structure wells. However, the Coulomb model cannot …