AInputs → design
Start at the reservoir
From depth, pressure and fluid to a casing design
- Know the target: reservoir depth, pressure, temperature and fluid type.
- Map the hazards: unstable shales, freshwater aquifers, loss zones and sour gas.
- Set the outputs: trajectory, total depth, and how many casing strings it takes to get there safely.
↑ The schematic shows the rock column and the pay zone at the bottom — the hole is still empty.
⇄ Switch Environment to Subsea at any point — the tree moves to the seabed and the well ties back through a jumper, manifold, flowline and riser to a host.
BCasing programme
Telescoping steel to the pay
Each string set deeper and narrower than the last
- Conductor — supports the wellhead, stops shallow washout. Tap to inspect →
- Surface — isolates and protects freshwater aquifers.
- Intermediate — seals off unstable or high-pressure formations.
- Production — confines reservoir fluids to the flow path.
↑ Tap any string to read its size, setting depth and job.
CConstruct
Drill, case, cement — repeat
Bonded to the rock, section by section, top-down
- Drill a section: the bit cuts while mud cools it, lifts cuttings and holds back formation pressure.
- Case & cement: run the string and pump cement into the annulus to bond steel to rock.
- Install the BOP, then drill the next, narrower section and repeat to total depth.
Detail worth seeing
Surface cement runs all the way up; the intermediate cement top is lapped above the previous shoe, not carried to surface — watch where the sage annuli start on the schematic.
↑ At surface, the derrick and BOP stack sit over the well while it's drilled and cased — they come off once the tree goes on.
DWell integrity
Two barriers, always
Nothing reaches the environment without passing two independent seals
- Primary envelope: production tubing, packer, downhole safety valve, and the production casing & cement below the packer.
- Secondary envelope: casing & cement above the packer, the wellhead, tubing hanger and christmas tree.
- Both are tested at installation and monitored for the life of the well.
Try it
Hit Primary then Secondary in the controls. Note the downhole safety valve lights up with the primary envelope — it isolates the tubing, the primary conduit.
EComplete
Connect the reservoir
Open or cased — two ways to let the rock flow
- Cased & perforated: casing run and cemented across the pay, then perforated. Best for layered or weak formations needing selective control.
- Open hole: reservoir left uncased, fluids enter directly. Fast and cheap in competent rock and horizontal wells — but little control over what flows.
Cased hole
- Selective, zone-by-zone control
- Works in weak, layered rock
- More time, cost & kit
Open hole
- Low cost, fast
- Great in competent / horizontal rock
- Less control over water & zones
↑ Toggle Cased & perforated / Open hole to swap the reservoir connection.
FSmart completion
Control the well without a rig
Split the reservoir and manage each zone from surface
- Zonal isolation: packers divide the reservoir into separate compartments.
- Flow-control valves (ICVs): each zone is opened, choked or shut from surface.
- Sensors & control lines: pressure, temperature and flow measured in real time over hydraulic and fibre-optic lines.
Try it
Switch Downhole control to Smart, then open, choke or shut each zone — the inflow arrows respond. You manage water or gas breakthrough with no rig visit; the trade-off is higher cost and downhole complexity.
GService through life
Wells are never left alone
Measure, maintain, improve — through a live well
- Wireline — a thin cable carrying tools and data: logging, perforating, setting plugs, valve changes. Fast, but light tools only.
- Coiled tubing — continuous pipe pushed in by an injector head. It brings force and can pump fluid while it moves: cleanouts, milling, acid washes.
- Stimulation — matrix acidising below frac pressure to dissolve damage, or hydraulic fracturing above it with proppant to crack the rock open.
↑ Run each intervention with the Service the well controls — the spread swaps too: wireline unit, injector head & reel, or pump trucks on a surface tree; an LWI vessel & workover riser onto the XT in subsea.
HPlug & abandon
Give it back, permanently
Two verified barriers restore the seal — for good
- Primary barrier plug across the reservoir — cement placed rock-to-rock so nothing can leave the pay zone.
- Secondary barrier plug higher up: an independent backup that reseals the full cross-section.
- Surface plug as a shallow environmental barrier, then the casing is cut and the wellhead or tree recovered.
Try it
Switch End of life to Plug & abandon. The completion is pulled and cement plugs take over — the same two-barrier logic as production, only now permanent. It's the last, and least reversible, decision in the well's life.
↓ Works in both environments — subsea wells are cut below the mudline and the seabed is cleared.