Closed-Loop Auto-Driller · Stick-Slip Mitigation

Real WITSML telemetry from Equinor's Volve open dataset (Well 15/9-F-9 A, 2009). Play through the drilling session, tune detection and controller parameters, and watch the simulation respond in real time.

Drill Section

12.25 in

424 – 1206 m Measured Depth

Peak Downhole Oscillation

381 rpm

Measured at MWD tool — bit-rock interface

Events Detected

8 events

1 severe · 3 moderate

Detection Accuracy

r = 0.758

vs. MWD ground truth · n = 973

Torsional Period

18.3 s

0.0546 Hz · FFT of torque signal

Surface RPM variation during MWD-confirmed stick-slip events was ±1 rpm while downhole PKtoPK oscillation reached 381 rpm — a 380× attenuation by the drill string acting as a torsional spring. This demonstrates why downhole MWD data is essential for reliable stick-slip detection in this well.

0s / 160h 25m
0events detected

Live Severity

STABLE
0.000STABLEComposite Severity Score00.51

Composite Severity Score

Smoothed display · raw CSS 0.000

Live Readings

Depth
424 m
RPM
90→ SP 110
WOB
8.67 kkgf→ SP 6.76
Torque
— kNm
MWD
—
NORMALGround-truth downhole oscillation from BHA sensor — only available 9.9% of the time.

State Machine

Normal

Hold nominal WOB & RPM

active

Detecting

Monitoring CSS threshold…

Mitigating

WOB↓ RPM↑ active now

Recovering

CSS cleared — ramping WOB back

WOB setpoint

6.76kkgf

RPM setpoint

110rpm

Events so far

None yet — scrub forward