DESCRIPTION:
GLYCOL is a completely water-soluble synthetic polymer,
which absorbs strongly at the surface of troublesome swelling shales
forming a water-repellent barrier. Excellent inhibition is observed
in the presence of potassium ions and these are recommended for
optimum performance.
APPLICATION:
GLYCOL based mud additives were developed in response
to the need for enchanced performance water based mud systems. The
use of GLYCOL enables water based mud usage in areas where oil based
mud systems were previously the only option. A large research program
identified the products as being the most technically suitable on
the basis of the following properties:-
* Environmental assessment.
* Ability to inhibit shale dispersion and reduce swelling.
* Effect on shale hardness.
* Effect on lubricity.
* Effect on fluid loss.
* Effect on whole mud performance e.g. polymer compatibility, rheology,
etc.
* Effect on formation damage potential.
CLOUD POINT OF GLYCOL BASED MUD ADDITIVIES:
Cloud point refers to the property of “inverse solubility”
of the GLYCOL based mud additives when in solution i.e. they are
water soluble at ambient temperatures but become less soluble at
elevated temperatures. A micro emulsion is formed and the benefit
is seen in enhanced mud properties such as reduced fluid loss. The
cloud point behavior is dependent on additive type and molecular
structure as well as the temperature and salinity of the drilling
fluid.
FORMATION DAMAGE POTENTIAL:
GLYCOL additives have been evaluated in formation damage
experiments. They are found to be effectively non-damaging.
PACKAGING:
Available in 210 liter drums.
HAZARDS:
GLYCOL irritation to eye and skin if contacted.
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