This research aims to decrease the cost of last production stages
through decreasing the cost of potential casing repair by avoiding the
problems that casing string may be exposed to. Such problems are
caused by the temperature effect of salt dril
ling fluids as well as other
fluids normally existed in the annular behind casing at the nonecemented
intervals.
In this research, we focus on the swelling properties of clay, the cation
exchange capacity and the efficacy content of clay in mud, to deal
ideally the drilling problems attached to clay formations in Syrian oil
and gas fields.
"Korashina Anhdrite" formation in the Syrian Central Region's wells
considered as covering for "Korashina Dolimite" formation which is
a gas bearing reservoir, and consists of a succession of salt, clay,
and Shale. Much of the problems faced durin
g drilling this strata
like (High over pull/drag values, high pumps pressure, drill string
stuck), which led in some cases to stop the drilling operation, and
thus an increase in the drilling time, resulting in high final cost for
the completion of the well, salt saturated water based drilling mud
used to drill this formation but it did not completely solve the
problems.
This research aims to find out drilling mud treated with some kinds
of polymers and salts to be used to drill this formation with the
least problems.
