초록 ▼

Acidic compositions comprising mixtures of hydrochloric, phosphoric, oxalic and citric acids, optionally additionally containing oleic, hydrofluoric or sulfuric acid and methods of preparing the acidic mixtures. Uses for certain mixtures of the acids include treating crude oil, in oil recovery proce

Acidic compositions comprising mixtures of hydrochloric, phosphoric, oxalic and citric acids, optionally additionally containing oleic, hydrofluoric or sulfuric acid and methods of preparing the acidic mixtures. Uses for certain mixtures of the acids include treating crude oil, in oil recovery processes, for well acidizing, cleaning glass, in batteries, removing corrosion from metals, removing oil residues from oil handling equipment and reactivating wells clogged with asphaltene.

대표청구항 ▼

A method for acidizing wells surrounded by clay or silicate formations, said method comprising the steps of: (a) mixing water and hydrochloric acid with relatively smaller amounts of phosphoric, oxalic and citric acids and urotropine to form a first solution, said hydrochloric acid present in said f

A method for acidizing wells surrounded by clay or silicate formations, said method comprising the steps of: (a) mixing water and hydrochloric acid with relatively smaller amounts of phosphoric, oxalic and citric acids and urotropine to form a first solution, said hydrochloric acid present in said first solution having a concentration of 1-60 percent by weight of said first solution, said phosphoric acid present in said first solution having a concentration of 0.2 percent by weight of said first solution, said oxalic acid present in said first solution having a concentration of 0.1-10 percent by weight of said first solution and said citric acid present in said first solution having a concentration of 0.1-25 percent by weight of said first solution; (b) forming a second solution by mixing a portion of said first solution with additional hydrochloric acid; (c) forming a third solution by mixing the remaining portion of said first solution with hydroflouric acid; (d) forming a fourth solution by mixing said second and third solutions; and (e) introducing said fourth solution into the well and into contact with the clay or silicate formations.