There is a very large number of wells worldwide that leak or have sustained casing pressure
(SCP). In Central Europe and the Middle East there are hundreds of wells with reports of …

The presence of borehole rippling, spiraling, and hour-glassing have been known for many
years in the drilling industry. Descriptions of these problems have become more precise with …

There are four key technical issues to be addressed when drilling directional wells with
steerable bits and bottom hole assemblies: maximizing hole quality, addressing tool face …

Directional drilling is a critical necessity in many of today's wells. Accurate prediction and
awareness of achievable build rates is vital in lowering drilling cost. The science behind …

In this study, the theory of nonlinear optimization is used to develop a well-design computer
model to determine the optimum directional parameters to minimize drilling depth and …

An experimental study of the effect of hydraulic vibrations on initiation of buckling and axial
force transfer for helically buckled pipes at simulated horizontal wellbore conditions has …

Gas reservoirs with abnormally high pressure have been encountered all over the world.
Due to unusual stress environments, a potential impact to reservoir performance is the stress …

Extended-reach drilling (ERD) technology has rapidly developed during the past two
decades and the drilling of ultraextended-reach (u-ERD) wells to extend their reach to …

Wellbore friction is one of the biggest concerns when drilling due to its relation to the total
cost. The catenary concept was introduced to reduce wellbore friction, but it requires …

A new type of rotary steering stabilizer used in a common rotary bottom hole assembly
(BHA) to control well path was developed. In order for design and use of this kind of BHA …