Boost your HPHT well productivity with CarboFLO™ advanced chemistry
In matrix acidizing, the goal is to dissolve minerals in the rock to increase well productivity. This is accomplished by injecting a solution of acid into the formation at a pressure between the pore pressure and fracture pressure. A hydrochloric acid solution typically dissolves the calcite rock matrix in the form of wormholing (conductive channels). These wormholes propagate from the wellbore out into the reservoir, bypassing the damaged zone.
There are four parameters that affect performance: the concentration of calcite present, injection rate of the acid, reaction type, and heterogeneity. Reaction type greatly depends on the formation temperature. At more than 90 deg C the reaction type tends to be face dissolution instead of wormholing
CarboFLO™ creates wormholes in HPHT environment as it penetrates deeper into the reservoir than HCl acid
CarboFLO™ cost-effective formulation removes the drilling fluid damage and restores the productivity of the wells
HPHT carbonate reservoirs are penetrated using drilling fluid containing the mixture of barite and calcite as a weighting material. Main production in these tight reservoirs comes from the network of natural fractures, which are damaged by the invasion of the drilling fluid.
Barite, BaSO4, is difficult to dissolve mineral. It invades the near-wellbore area when used in the drilling fluids as a weighting material, or deposits in the pore space as a scale.
High reservoir temperature and low barite solubility are the limiting factors in using HCl-based stimulation fluids
A patented CarboFLO™ technology is based on aqueous solutions containing a chelating agents GLDA, DTPA or EDTA or their salts in concentrations from 40 to 60 wt.% by the weight of the aqueous solution.
The acidity of the solution is regulated depending on its application by adding an inorganic acid and a surfactant-based stabilizer.
CarboFLO™ is used in removal of formation and wellbore damage from drilling fluids (barite). It increases Oil and Gas production by etching wormholes in the calcite rocks in reservoirs with a temperature above 90 degrees C.
GLDA (pH 3.6-4)
Dissolution and wormholing in calcite rock matrix - CaCO3 (Calcite/dolomite) and
removal of Iron scales
GLDA high pH (11.5)
Dissolution and removal CaSO4 scale
DTPA (pH > 12)
Dissolution and removal of barite from the drilling mud BaSO4 (drilling mud cleanup) and removal of SrSO4 scale
K4EDTA (pH >12)
Dissolution and removal of barite BaSO4 (drilling mud),
CaCO3 (calcite/dolomite) and iron scale
FeCO3 (and some other scales)