Use of degradable ball sealers to seal casing perforations in well treatment fluid diversion
US4716964A · kind A · utility
274Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Dec 10, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Plugging perforations in casing in a wellbore penetrating a subterranean formation using degradale ball sealers. The ball sealer used is composed of a polyester polymer which is substantially insoluble in the wellbore fluid. The polymer degrades in the presence of water at an elevated temperature to form small molecules which are soluble in a fluid in the subterranean formation. After the polymer degrades, the flow through the perforation returns to substantially its initial value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.