Well kill is not an abandonment technique. Specifically it is performed so that an intervention can be performed (wireline, coiled tubing, frac etc.). A well may be killed several times during its life depending on intervention requirements that may arrize.
We are shortly going to be injecting some cruddy bore water (20,000 bbl/day) into our oil reservoir for pressure support.
At the moment the big debate is whether to go for bag/cartridge water filters or a filtration system that has some degree of self-cleaning ability (self-flush or vibrate)...