Matrix treatment of damaged sandstone formations using buffered HF-acidizing solutions
AssigneeBJ Services Company
InventorsPhilip James Rae, Gino Di Lullo Arias, Atikah Jamilah Ahmad
Life of this patent
Estimating the term…
Abstract
Sandstone formations of oil and gas and geothermal wells are effectively stimulated when a buffered HF-sandstone acidizing solution is employed without 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.
Claims20
A method for dissolving acid-soluble siliceous material in a sandstone formation of an oil or gas or geothermal well which comprises introducing into the well, in the absence of a preflush solution, a buffered HF-sandstone acidizing solution.
In a method of well remediation in which a wellbore fluid is employed, the improvement comprising using a wellbore fluid comprising a buffered HF-sandstone acidizing solution.
A method of stimulating or remediating a sandstone formation consisting essentially of introducing into the formation a buffered HF-acidizing solution.
A process for dissolving acid-soluble siliceous material in a sandstone formation of an oil or gas or geothermal well consisting essentially of introducing into the well a buffered HF-acidizing solution.
Dependencies are inferred from the claim text.