Method for reducing permeability restriction near wellbore
US6945327B2 · kind B2 · utility
27Cited by
12References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 11, 2003 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jan 8, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/575
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Method is provided for increasing the productivity of gas wells producing from reservoirs where retrograde condensation occurs around the wells. An oil-wetting surfactant is injected in a solvent to oil wet the formation for a selected distance around a well or a hydraulic fracture intersecting the well. A pre-flush liquid, such as carbon dioxide, alcohol or similar products and mixtures thereof, may be used to reduce water saturation before injection of the surfactant. The method may also be applied to increase the productivity of oil wells producing from reservoirs where breakout of solution gas occurs near the well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.