Method of using water-in-oil emulsion to remove oil base or synthetic oil base filter cake
US7481273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2007 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Jun 18, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/929
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Fluid producing or injecting wells may be treated with a water-in-oil emulsion for the removal or inhibition of unwanted particulates, including pipe dope, asphaltenes and paraffins. In addition, such emulsions are effective in the displacement of oil base drilling muds and/or residues from such muds from wells. The emulsion may also be used to break the interfacial and/or rheological properties of oil base mud and synthetic oil base mud filter cakes, and act as a demulsifier to break the water-in-oil emulsion present in such oil base and synthetic oil base muds. The water-in-oil emulsions may optionally contain a dispersing agent as well as a surfactant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.