Wells – Processes – Freeing stuck object – grappling or fishing in well
Patent
1992-07-14
1993-09-28
Suchfield, George A.
Wells
Processes
Freeing stuck object, grappling or fishing in well
252 8551, E21B 3100, E21B 3103
Patent
active
052479927
ABSTRACT:
This invention discloses a method which utilizes an improved spotting fluid composition to release a stuck drill string in the bore hole of an underground formation employing an aqueous drilling fluid, the improved composition used in contacting the mud cake which has been deposited on the well bore face against which the drill string has become stuck, the improved spotting fluid composition comprising of one or more carboxylic acids with specific chemical and physical properties. The acid or acids of choice must be used in the acid form and must have a pKa value maximum of 6.5, ambiant temperature water solubility minimum of 0.5 moles per liter and must generate a maximum pH of 4.0 in water at ambiant temperature.
REFERENCES:
patent: 2900026 (1959-08-01), Trusheim et al.
patent: 3099624 (1963-07-01), Wilson
patent: 3126970 (1964-03-01), Rygg
patent: 3217802 (1965-11-01), Reddie et al.
patent: 4427564 (1984-11-01), Brownawell et al.
patent: 4464269 (1984-08-01), Walker et al.
patent: 4614235 (1986-09-01), Keener et al.
patent: 4964615 (1990-10-01), Mueller et al.
patent: 5127475 (1992-07-01), Hayes et al.
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