| 摘要 |
<p>A method for controlling the precipitation of sulphate salts from a solution by introducing a source of metal ions into the solution, the metal ions being capable of forming a salt with the sulphate ions and then controlling the reaction conditions in the solution to control the. point at which the sulphate salt precipitate is formed. The method can be applied to the recovery of hydrocarbons from a hydrocarbon reservoir; in which case, calcium ions are added to an injector fluid such as naturally occurring, sulphate containing, brine. The method of the present invention removes the need for complex and expensive injector fluid treatment designed to minimise unwanted sulphate precipitation. In addition, the location of the sulphate precipitation in the hydrocarbon reservoir can be controlled to improve hydrocarbon output.</p> |
