Stuck drill pipe additive and method
AssigneeContact Marketing Solutions, LLS
InventorDavid H. Creasey
Life of this patent
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Abstract
An aqueous mixture of a non-toxic, low pH, antimicrobial, acidic composition having a pH between approximately 0.5 and approximately 3.5 is used in a drilling fluid and a stuck pipe additive. One embodiment of the stuck pipe additive composition includes an alkali metal halide salt in a range of approximately 10-35 weight %; a sequenching agent in a range between 2-8 weight %, a low pH, non-toxic acid composition in a range of 0.5-20 weight percent and water in a range of 7-88.5 weight %. As a drilling fluid, it maintains well control and removes drill cuttings from holes drilled into the earth. As a spotting fluid, it frees a stuck drill stem in the annulus of a bore hole in minutes.
Claims16
A spotting fluid for releasing stuck drill pipe, comprising (a) an aqueous based continuous phase that has the characteristics of brine;
- and (b) a non-toxic, low pH acidic composition with antimicrobial properties prepared by the process of combining a high purity inorganic acid with water and a metallic sulfate compound, heating the mixture to approximately 140° F. to form mixture (I), placing mixture (I) in a pressurized vessel and heating the mixture, under pressure, to temperatures in a range between approximately 200° F. and 400° F., cooling the mixture, and adding a stabilizing amount of the starting mixture (I) to the cooled mixture, wherein the pH of the spotting fluid is less than 6.5.
A method for releasing a stuck drill pipe comprising contacting an interval of a borehole in which a drill string has become stuck with a spotting fluid comprising (a) an aqueous based continuous phase and (b) a low pH acidic composition prepared by the process of combining a high purity inorganic acid with water and an ammonium compound, heating the mixture to approximately 140° F. to form mixture (I), placing mixture (I) in a pressurized vessel and heating the mixture, under pressure, to temperatures in a range between approximately 200° F. and 400° F., then cooling the mixture, after the mixture is cooled adding a stabilizing amount of the starting mixture (I), wherein the pH of the spotting fluid is less than 6.5.
Dependencies are inferred from the claim text.