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Services/Produced water, flow assurance and flowline integrity

Produced water, flow assurance and flowline integrity

On a mature field, water handling, scale and flowline condition decide how much oil you can move. We build the water balance for each disposal route, confirm scale before anyone treats it, and keep replacement, service tests and risk on one timeline for each well.

IThe question

If the oil moves, where does the water go, and will the line carry it?

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.

Where the water goes

Produced water routes on a water-flooded field. Each route has its own capacity, pressure and way to fail.

Conceptual, not for construction
WellsCPF trainsseparation, dehydrationWater treatmentoil in water, interface controlDisposal wellsinjectivity at actual pressureRe-injectionpressure supportEvaporation pondsnot disposal; oil recovery laterTransfer pumps: N+1 capacity, single-pump stability, trip fallback route.recovered oil and recycleMeasured at each boundaryRate, oil in water, pressure and pump status, with the meter accuracy known.Seven streams1. generated and separated2. treated or transferred3. injected for disposal4. re-injected5. sent to ponds6. excursions and recycles7. outages and pressure
Figure 1. Disposal and re-injection in two blues, ponds in red, as agreed with the operator. Injectivity is taken at the actual wellhead pressure, not at nameplate.
Figure 1 · ConceptualIssued 18 October 2026 · Rev 0
IIWhat we do
  • i

    Water balance and disposal headroom

    Oil, water and gas by facility. Available treatment and disposal by route. Where the shortfall is and which wells it affects.

  • ii

    Produced water system review

    Oil-in-water sampling and analysers, interface control in dehydrators and separators, transfer metering accuracy, N+1 pump capacity, and the fallback route when a pump trips or an injection well fails.

  • iii

    Scale identification and treatment

    Trend alerts, a location hypothesis (choke, flowline or both), field inspection and samples, chemistry and inhibitor history, a targeted work order, controlled treatment and a post-job review.

  • iv

    Flowline replacement programme

    Ranking by integrity risk, production value and overlap with other scope. Risk exports, service tests and replacement milestones brought into one record per well.

  • v

    Material and vendor references

    Glass-reinforced epoxy and polymer line manuals are generic references until a line-specific rating, joint detail and material approval exist.

IIIWhat you receive

Deliverables

  • Produced water balance by facility and route, with headroom
  • Water system problem register and options
  • Scale identification procedure and treatment schedule
  • Flowline programme tracker with planned and actual milestones
  • Integrity, service test and replacement timeline per well

Water balances are built from your daily summaries and test data with a stated reference date. Scale and flowline registers are refreshed weekly during a campaign.

AssosTech · Energy · Engineering

Start with the question


A technical question, a train that will not stabilise, a water balance that will not close, a data room that will not reconcile. Describe it in a paragraph and we will propose the scope.

hello@assostechltd.com · 5 South Charlotte Street, Edinburgh, EH2 4AN