Methods of displacing liquids through pipes
US5346011A · kind A · utility
23Cited by
13References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Apr 1, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/4643
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved methods of displacing a first liquid through a pipe with a second liquid while preventing the first and second liquids from mixing are provided. In accordance with the methods, a plug is formed in-situ in the pipe between the first and second liquids by injecting a self-thickening liquid therein and permitting the liquid to thicken. The formed plug and the first liquid are then displaced through the pipe with the second liquid. The methods are particularly suitable for carrying out subterranean well bore cementing operations wherein cement slurries are displaced through pipes disposed in well bores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.