| 摘要 |
There is provided an aqueous brine fluid having a pH of less than about 5 and containing a high salt concentration and a basic N-heterocyclic polymer or copolymer such as polyvinyl pyridine which serves to increase the viscosity of the fluid, particularly at elevated temperatures of above about 300 DEG F. These fluids are particularly useful as drilling fluids for the drilling of oil and gas wells.
|
