MATRIX TREATMENT OF DAMAGED SANDSTONE FORMATIONS USING BUFFERED HF-ACIDIZING SOLUTIONS

摘要

Sandstone formations of oil and gas and geothermal wells are effectivel y stimulated when a buffered HF-sandstone acidizing solution is employed witho ut the prior introduction of an acid containing preflush solution. By not using a preflush solution, buffered HF-sandstone acidizing solutions are highly effective in dissolving and removing siliceous material while minimizing the formation of calcium fluoride.