Use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid
US10336931B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2018 |
| Grant date | Jul 2, 2019 |
| Priority date | — |
| Expiry date | Jan 18, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/602
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the well drilling field in petrochemical industry, in particular to use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid. The dual-cation fluorocarbon surfactant is a dual-cation fluorocarbon surfactant of which the cation part is represented by the following formula (1). The dual-cation fluorocarbon surfactant of the present invention can serve as wettability reversal agent when it is used for oil-gas drilling to enable rock amphiphobic, and is an amphiphobic wettability reversal agent which can cause rock surface to be non-hydrophilic and non-lipophilic. Using of dual-cation fluorocarbon surfactant, especially when drilling highly hydrous mud shale, can avoid permeation of water and oil into the rock effectively and thereby a capillary phenomenon can be prevented, and an effect of stabilizing the well wall and protecting the reservoir is attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.