SXE Emulsified Acid | HT Carbonate Acidizing | Schlumberger

SXE

Emulsified acid

Improve your matrix acidizing and acid fracturing results

SXE emulsified acid improves your matrix acidizing and acid fracturing treatments in high-temperature reservoirs. This viscous, highly retarded HCl system is designed to overcome acid penetration problems in reservoirs above 250 degF [121 degC].

Standard hydrochloric (HCl) acid reacts very rapidly in carbonate formations. The reaction is so rapid at high temperature that it is impossible for acid to penetrate, or wormhole, more than a few inches into the formation. As a result, the reservoir is not stimulated. SXE acid delivers deep, live-acid penetration by retarding the acid reaction. This oil-external emulsion is formed with a 70:30 HCl-to-oil ratio, stabilized with an emulsifier. HCl concentrations ranging from 7.5% to 28% may be used in either a batch or continuous mix system.

Slow the reaction to improve penetration and stimulation

SXE acid is significantly retarded with respect to HCl. The retardation depends on temperature, acid concentration, flow regime (laminar, transitional, or turbulent) and type of rock (dolomite or limestone). Between 250 and 350 degF [121 and 177 degC] the HCl-limestone and HCl-dolomite reactions are mass-transfer controlled.

SXE emulsified acid
Laboratory core flow test results showing branching wormhole created in a limestone core using SXE acid.
Pemex Increases Oil Production 162% More than Predicted
SXE emulsion maximizes acid penetration in Samaria well
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