Foaming agents for use in coal seam reservoirs
US6720290B2 · kind B2 · utility
111Cited by
33References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Apr 3, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/703
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam that comprises a gas such as nitrogen or air. Preferably, the surfactant has the formulaR—NH2—(CH2)n—C(O)OXwherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.