Produced water is usually the first limit a brownfield project hits and the last one anyone models. Move wells or raise liquid throughput and the bottleneck shifts to a treatment skid, a disposal pump, an injection well or an evaporation pond. We track seven streams separately: water generated and separated by train; water treated or transferred; water injected for disposal; water re-injected for pressure support; water sent to ponds; oil-in-water excursions and recycles; and outages, pump availability and disposal pressure. Injectivity is taken at the actual wellhead pressure, never at nameplate.
Scale work starts with the trends and ends with a post-job review. A rising differential pressure across a choke or a flowline is a hypothesis. Rate, temperature, choke position, reservoir change, emulsion, sand and instrument health all have to be ruled out before a flush or a workover is approved.
Flowline integrity is run as a programme, not a list. For each line we hold the condition and risk from the integrity system, the service test history, the replacement scope and priority, and the survey, construction, completion, test and handover dates, planned against actual, joined to the well it serves.