Downhole drilling spotting fluid composition and method

Details Downhole drilling spotting fluid composition and method Downhole drilling spotting fluid composition and method

1991-02-19

1992-07-07

Suchfield, George A.

Wells

Processes

Freeing stuck object, grappling or fishing in well

175 65, 252 8551, E21B 3100, E21B 3103

Patent

active

051274752

ABSTRACT:
An aqueous-based composition comprising a glycerophosphoric acid ester and a diacetyltartaric acid ester of mono and/or diglycerides when combined with viscosifier, sealant and weighting agent is suitable for use as a spotting fluid for downhole drilling operations for releasing stuck drill string. The present invention also enhances drill fluid lubricity, is nontoxic to marine life, non-polluting and may be safely disposed of in off-shore waters.

REFERENCES:
patent: 2345388 (1944-03-01), Ericks et al.
patent: 2357497 (1944-09-01), Bond
patent: 2661334 (1953-12-01), Lummus
patent: 4323124 (1982-04-01), Swan
patent: 4737295 (1988-04-01), Cowan et al.
patent: 4843048 (1989-06-01), House et al.
patent: 4964615 (1990-10-01), Hayes

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