Annulus
Product · Gain

Influx rate. With an interval.

Influx and loss rate from pump strokes, standpipe pressure, flow-out, pit and trip tank, with an interval.

The demoThe numbers
1

Influx and loss rate, with an interval

2

Ranked against its look-alikes

3

An advisory, never a shut-in

Hands on

Three steps.

2

Watch the surface channels

Now showingA sudden kick Pore pressure above the mud's. Mud 1261 kg/m³.
Simulated well
0 m1,000 m2,000 m3,000 mshoeDRILLING
Active pit403.8 bbl
Flow out (paddle)83.2 %
Standpipe pressure229.7 bar
What explains it
Influx
2%
Loss
2%
Ballooning
2%
Pit transfer
2%
Sensor fault
2%
Unexplained
2%
Annulus says

Nothing to explain

The channels match the model.

How it turned out
3

One clear advisory

Advisory

No advisory. Mud 1261 kg/m³; nothing the model cannot explain.

Advisory onlyNever issues a shut-inA person decides

What it needs

  • Real-time surface channels for one well
  • Well geometry and mud properties
  • Connection and flow-check history

What it is not

  • Never issues a shut-in
  • Not a managed-pressure drilling system
  • The rate interval covers 5 %, not 90 %

Proven, in simulation

  • Raises an alarm 1.5 minutes sooner than flow-back fingerprinting at the same false-flow-check rate (90 % interval 0.9–2.1 min; simulation, t001)
  • Pit transfers read as influx in 1 % of runs; pit-gain threshold 15 %, flow-back fingerprinting 8 %, lumped observer 7 %
  • Ballooning never seen in training read as influx in 1 % of held-out runs

Not proven

  • Against the bar: 5.9 bbl more gained at alarm than flow-back fingerprinting and 10.4 bbl more than the lumped observer, both beyond the interval
  • The lumped observer gains least before its alarm: 14 bbl against 25 bbl
  • The influx-rate interval covers 5 % of true rates, not 90 %
  • At three times the channel noise it catches 66 % of influxes; the baselines 97–99 %
  • Sensor faults read as influx in 9 % of runs; pit-gain threshold 0 %
  • No labelled public field kick exists; no gas kick, no oil-based mud, no managed-pressure drilling
Works with

Balloon

Kick or ballooning.

Open →

Limit

Smallest influx it can see.

Open →

Check

Flow checks that were worth it.

Open →

Mode

Which rig state we are in.

Open →
Gain — Influx rate. With an interval. · Annulus