- A unique drilling, completion and workover fluid additive
- Used in preparation of Thixsal-Ultra
Systems
DESCRIPTION
Thixsal-Ultra is an additive for
aqueous fluids which, when combined with soluble, sized bridging
particles of sodium chloride, calcium carbonate, or oil soluble
resin, generates a non-damaging fluid system which exhibits
enhanced rheological properties and superior filtration control.
Thixsal-Ultra is a blend of xanthan gum
biopolymer with a specially processed, stabilized non-ionic starch
ether. This unique polymer combination is synergistic and yields
improved static suspension and provides a highly shear-thinning
viscosity under dynamic conditions. Thixsal-Ultra is packaged in 50 lb or 25 kg
sacks.
BASE FLUIDS
Thixsal-Ultra may be used in sea water,
potassium chloride, sodium chloride, and sodium bromide solutions.
Suitable composition may also be formulated in calcium chloride
with brine densities up to 10.8 lb/gal.
APPLICATIONS
Thixsal-Ultra is designed for
application in drilling, completion, and workover operations to
provide a low fluid viscosity at high rates of shear, an elevated
solution viscosity under static conditions and superior filtration
control. Thixsal-Ultra, when used in
association with specially sized bridging/weighting particles will
reduce whole fluid and filtrate invasion into the productive zone
and thereby minimize internal formation damage. Fluid compositions
mixed with Thixsal-Ultra may be utilized
for the following specific applications:
- Drilling into payzone
- Milling
- Underreaming
- Washing sand
FEATURES
- Effective well control; when properly formulated, forms a thin,
ultra-low permeability, readily removable filter cake allowing
hydrostatic pressure overbalance with minimal invasion of solids
and fluid into producing formations
- Polymer synergism provides thermally stable fluid rheological
properties with improved suspension at downhole temperatures up to
275oF with the addition of pH
Buffer
- Formulations containing
Thermasal™-A,
Thermasal-B, and Polytex AHT
provide thermal stability up to a bottom hole temperature of
325°F