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Industry Article: Organic Clay Acid System Sustains Post-Treatment Production Increases

A comparative evaluation of matrix acid systems was conducted in a high-clay reservoir for Petrobras

Organic Clay Acid System Sustains Post-Treatment Production Increases
Publication: World Oil
Publication Date: 07/01/2010

Many sandstone reservoirs are composed of more than 40% clay and feldspar. Common problems in these reservoirs include fines migration and poor response to conventional, hydrofluoric acid-based fluids that use organic and inorganic acids. A comparative evaluation of matrix acid treatments was done in a high-clay reservoir. Results from conventional systems showed initial production increase and sharp production decline shortly after. Customized organic clay acid, however, showed good initial post-treatment production rates that were sustained for 6 months.




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