Filtration apparatus and method

摘要

A filtration apparatus for treating a fluid prior to being injected into a subterranean hydrocarbon-bearing formation includes a filtration unit having one or more filtration membranes including either or both ultra-filtration membranes and micro-filtration membranes. In one disclosed embodiment the filtration apparatus is utilised to filter a fluid prior to being treated in a sulfate removal plant. A method of treating a fluid to be injected into a subterranean formation is also disclosed.