Method for controlling lost circulation of drilling fluids with hydrocarbon absorbent polymers
US4633950A · kind A · utility
105Cited by
28References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | May 28, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/903
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention is a method for reducing lost circulation of aqueous or oil based drilling fluids wherein one or more hydrocarbon absorbent polymers are dispersed in an aqueous carrier fluid which is injected into the lost circulation zone. The aqueous carrier fluid initially prevents hydrocarbon from contacting the hydrocarbon absorbent polymer until such contact is desired. Once the aqueous polymer slug is properly placed at the lost circulation zone, a hydrocarbon is mixed with the aqueous slug so that the polymer will expand with the absorbed hydrocarbon and substantially increase in size to close off the lost circulation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.