Composition for decreasing lost circulation during well...

Details Composition for decreasing lost circulation during well... Composition for decreasing lost circulation during well...

2008-07-29

2008-07-29

Moore, Margaret G (Department: 1796)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S269000, C166S294000

Reexamination Certificate

active

11291027

ABSTRACT:
A method is provided for reducing lost circulation when aqueous, oil, or synthetic based drilling fluid is used. The method includes injecting two fluids into the well bore and lost circulation zone. The first fluid is an aqueous liquid containing at least one polymer capable of absorbing water in an alkaline environment. The aqueous liquid has a pH that inhibits at least one polymer from absorbing water. The second fluid contains a hardening composition in a base fluid having a pH sufficient to increase the pH in situ to allow at least one polymer to absorb water and expand with the absorbed water and substantially increase in size to close off the lost circulation zone and allow the hardening composition to create a plug in the well bore and set up.

REFERENCES:
patent: 3736163 (1973-05-01), Hoopes et al.
patent: 4369844 (1983-01-01), Clear
patent: 5147852 (1992-09-01), Cowan et al.
patent: 5945182 (1999-08-01), Fowler et al.
patent: 6016879 (2000-01-01), Burts, Jr.
patent: 2002/0128158 (2002-09-01), Green

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