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US 5,344,817 AGranted
Downhole drilling spotting fluid composition and method
AssigneeTurbo-Chem International, Inc.
InventorsJames R. Hayes, Gale J. Campbell
Life of this patent
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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.
Claims9
A method for lubricating a downhole well drilling operation comprising the steps of:
- (a) mixing a spotting fluid concentrate composition comprising water soluble glycerophosphoric acid ester prepared as the reaction product of glycerin and phosphoric acid, an optional viscosifying agent and an optional sealing agent with drilling mud;
- and
- (b) circulating said mud mixture through the well.
Dependencies are inferred from the claim text.