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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

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CarboFLO™ creates wormholes in HPHT environment as it penetrates deeper into the reservoir than HCl acid

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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.

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Acid reaction wormholing

CarboFLO™Applications

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CARBOFLO A
GLDA (pH 3.6-4)

Dissolution and wormholing in calcite rock matrix - CaCO3 (Calcite/dolomite) and 
removal of Iron scales

CARBOFLO B
GLDA high pH (11.5)

Dissolution and removal CaSO4 scale 

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CARBOFLO C
DTPA (pH > 12)

Dissolution and removal of barite from the drilling mud BaSO4 (drilling mud cleanup) and removal of SrSO4 scale

CARBOFLO D
K4EDTA (pH >12) 

Dissolution and removal of barite BaSO4 (drilling mud),
CaCO3 (calcite/dolomite) and iron scale 
FeCO3 (and some other scales)