Shear-sensitive plugging fluid for plugging and a method for plugging a subterranean formation zone
US6815399B1 · kind B1 · utility
28Cited by
6References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 17, 2002 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Jun 17, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/5756
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A plugging fluid for plugging a subterranean formation zone surrounding a drill hole consisting of an emulsion comprising an oil phase containing an oil, an emulsifier and 2.4 to 4 kg of cement per liter of oil and an aqueous phase containing water and 12-16 g of polysaccharide per liter of water, wherein the oil to water volume ratio ranges from 20:80 to 25:75. Upon shearing, the emulsion inverts so that the rupture of the emulsion droplets releases the cement into the water phase thus providing metallic divalent ion to crosslink with the polysaccharide and forming a gel structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.