DOI: 10.5593/sgem2012/s05.v2006


Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 471 - 480 pp


In general a horizontal well is drilled parallel to the reservoir bedding plane. Strictly
speaking, a vertical well is a well which intersects the reservoir bedding plane at 90. In
other words, a vertical well is drilled perpendicular to the bedding plane. If the reservoir
bedding plane is vertical, then a conventional vertical well will be drilled parallel to the
bedding plane and in the theoretical sense it would be a horizontal well. Horizontal
drilling which started less than ten years ago in the Middle East is becoming a major
factor in reserve improvement and recovery acceleration. In fact, drilling horizontal
wells is now more of a default option than an unconventional way of developing oil
fields. As stated in a recent study, major operating companies will ultimately utilize
horizontal and multilateral technology.
The drilling and production of horizontal well have been recognized as one of the most
important technical achievement in the oil and gas industry in the last twenty years.
Such technology was considered at the beginning an exotic way of drilling, the
economical applicability of which was contemplated with some skepticism by reservoir
and production engineers. A major breakthrough in horizontal drilling was made with
the introduction of the down-hole turbo drill/bent sub combination for direction drilling.
Rapid advancement in directional guidance technology such as the development of
steering tools, new tools e.g. resistivity at bit and non directional tools involved in
measurement while drilling, led to a recent surge in the usage of horizontal drilling
within the industry.

Keywords: horizontal well, vertical well, reservoir, oil fields, technology.