Describe or upload your BHA and we solve it with a
stiff-string finite-element model — Euler–Bernoulli beam,
unilateral low-side wall contact, buoyed weight — the same engine that
runs on our live wells. Check one inclination or upload a
whole survey and download it corrected. No account needed.
What the model assumes — read before trusting the number
Survey taken off bottom, no weight on bit — the string
hangs at the survey station; a survey taken with WOB stacked in is
a different beam problem and this correction does not apply.
Pumps off, not rotating — a static string. Mud matters
only as buoyancy, which is why we ask the mud weight.
In-gauge hole at the assembly. Picking up a few metres off
bottom is fine — the string then sits in hole you just drilled —
but a washed-out section under a stabiliser changes the contact
and the real sag.
Enter the inclination at the D&I sensor for the
station being corrected; corrected = raw + Δ.
Sag correction
Sign convention: Δ is added to
the raw survey (corrected = raw + Δ). On our live service this runs
on every station automatically — watch the demo wells
or request access.
