Oil Rig Rate of Trip In - ROTI

There is an oil rig that has set large steel casing yesterday and today 11883 feet into the earth. And now they are tripping back in at at rate, that I'm trying to determine. Let's just call it Rate of Trip In "ROTI"
It's currently 9:50pm
I have been recording the depth they are tripping it at thus far:
2700 feet at 7:45pm
5190 feet at 8:51pm
6500 feet at 9:47pm
6700 feet at 9:51pm

at this rate, what is the estimated ROTI?
and at what time should I expect them to reach the bottom at 11883 feet?

ChatGPT 5.2 said:
Using your points (depth increasing as they trip in):

Data

• 2700 ft @ 7:45 pm
• 5190 ft @ 8:51 pm
• 6500 ft @ 9:47 pm
• 6700 ft @ 9:51 pm

Estimated ROTI (Rate Of Trip In)

Segment rates

• 7:45 → 8:51 (66 min): 5190−2700 = 2490 ft
  ROTI ≈ 2490/66 = 37.7 ft/min (≈ 2260 ft/hr)
• 8:51 → 9:47 (56 min): 6500−5190 = 1310 ft
  ROTI ≈ 1310/56 = 23.4 ft/min (≈ 1400 ft/hr)
• 9:47 → 9:51 (4 min): 6700−6500 = 200 ft
  ROTI ≈ 200/4 = 50 ft/min (≈ 3000 ft/hr) (very short window; can be noisy)

Best single estimate (overall average so far)

From 7:45 → 9:51 (126 min): 6700−2700 = 4000 ft
ROTI ≈ 4000/126 = 31.75 ft/min (≈ 1905 ft/hr)

So, a solid estimate is ~32 ft/min, with recent behavior bouncing roughly ~23–50 ft/min.

ETA to bottom (11883 ft)

At 6700 ft @ 9:51 pm, remaining depth = 11883 − 6700 = 5183 ft.

• Using the overall average (~31.75 ft/min):
  Time remaining ≈ 5183 / 31.75 = 163.3 min ≈ 2 hr 43 min
  ETA ≈ 12:34 am (Feb 19)

If it tracks closer to the last ~hour average (8:51→9:51 is ~25.17 ft/min), then:

• Time remaining ≈ 5183 / 25.17 = 205.9 min ≈ 3 hr 26 min
  ETA ≈ 1:17 am (Feb 19)

Practical expectation: ~12:34 am if the overall pace holds, or ~1:15 am if they stay on the slower recent pace.

You said:
make a cool looking infographic with a big oil rig and interesting landscape with rig workers around working fast tripping the pipe back down in the hole and indicate the estimated "Rate of Trip In" with those words somewhere in the info-graphic.

You said:
so, then basically it's around 2000 feet per hour. I'll keep you updated when they actually reach the bottom.

ChatGPT said:
Yep — based on what you logged, ~1,900–2,000 ft/hr is a clean “working” ROTI number to think with (about ~32 ft/min).

When you get the bottom time + depth (or a couple more points on the way down), send them and I’ll:

• recompute the true average ROTI for the whole trip-in, and
• tell you whether they sped up or slowed down in the last stretch.

You said:
It's currently 11:11pm CT
here are my recent logs. Give me an updated rate and estimated touchdown:
7300 feet at 10:05pm
8191 feet at 10:35pm
9046 feet at 10:56pm
9425 feet at 11:08pm
9520 feet at 11:10pm

ChatGPT said:
Here’s the updated ROTI from your new logs (all times CT).

Segment ROTI (between points)

• 10:05 → 10:35 (30 min): 7300 → 8191 = +891 ft
  ROTI ≈ 29.7 ft/min ≈ 1,782 ft/hr
• 10:35 → 10:56 (21 min): 8191 → 9046 = +855 ft
  ROTI ≈ 40.7 ft/min ≈ 2,443 ft/hr
• 10:56 → 11:08 (12 min): 9046 → 9425 = +379 ft
  ROTI ≈ 31.6 ft/min ≈ 1,895 ft/hr
• 11:08 → 11:10 (2 min): 9425 → 9520 = +95 ft
  ROTI ≈ 47.5 ft/min ≈ 2,850 ft/hr (tiny window, can be “bursty”)

Best updated “working” ROTI

Using the longer recent window 10:05 → 11:10 (65 min):
9520 − 7300 = 2,220 ft over 65 min
✅ ROTI ≈ 34.15 ft/min ≈ 2,049 ft/hr (call it ~2,050 ft/hr, ~2,000)

Estimated touchdown time at 11,883 ft

Latest depth: 9,520 ft @ 11:10 pm
Remaining: 11,883 − 9,520 = 2,363 ft

• Using the recent average (~2,049 ft/hr):
  Time left ≈ 2,363 / 2,049 hr = 1.153 hr ≈ 69.2 min
  ETA ≈ 12:19 am CT

If they keep the faster pace from 10:35 → 11:10 (~2,278 ft/hr):
Time left ≈ 62.2 min → ETA ≈ 12:12 am CT

Updated touchdown expectation: ~12:12–12:21 am CT (most likely around ~12:19 am if the last hour holds).

Keep the next couple points coming — once you hit bottom I can give you the true overall ROTI for the entire trip-in.

You said:
It's currently 12:19am
from around 12:05am up until now, they paused Tripping in at 11410 feet.
and I hear loud banging and whooshing sounds and whipping sounds with a weird echo and cracking sounds. do you have any idea of what they are doing at this stage?

ChatGPT said:
Yeah — that kind of pause + loud mechanical “banging/echo” + whooshing + whipping is very common when they’re running back in hole and doing one of a few routine things.

You said they stopped around 11,410 ft (about 473 ft off bottom if bottom is 11,883). Here are the most likely “what’s happening” scenarios at that stage:

Most likely: they’re making a connection / handling pipe

When tripping in, they have to stop periodically to add another stand (or handle slips/elevators).

Sounds you’d hear

• Banging / cracking / echo: iron roughneck / tongs, stabbing the pipe, slips setting, elevators latching, pipe contacting the rotary table/rig floor
• Whipping sounds: spinning chain / torque lines snapping tight, hose/lines flexing as the top drive moves, pipe movement/vibration

A 10–15 minute pause can be totally normal if they’re:

• fighting alignment to stab in,
• swapping tools (elevator/slip type),
• or doing a slower connection because they’re deeper and being careful.

Very plausible near bottom: pumping / circulating / “breaking circulation”

As they approach TD/shoe, they’ll often:

• pump to fill the pipe,
• circulate/condition mud, or
• check pressures/flow before going the last few hundred feet.

Sounds you’d hear

• Whooshing: pumps and fluid moving through lines, standpipe/kelly hose noise, pressure changes
• Weird echo: rig structure amplifies it; the whole floor can resonate when pumps are on

Also possible: they hit a tight spot and are “working the pipe”

If the hole is a little tight, they may stop and:

• work it gently up/down,
• rotate/ream/wash,
• or circulate while easing through.

Sounds you’d hear

• more intermittent banging (pipe bumping), plus pumps/flow noise if they’re washing/reaming.

If they’re very close to shoe/float: preparing to tag/drill out

After casing is set, a common next step is running in with a BHA to tag the shoe/float equipment and drill out cement/float gear. They’ll often slow down and do checks before they “touch” anything.

Updated touchdown estimate (if they resume right after 12:19 am CT)

Remaining: 11,883 − 11,410 = 473 ft.

If they’re running around your recent ~2,050 ft/hr (~34 ft/min), that’s about 14 minutes of travel time once moving again.

So if they start moving again right after 12:19 am CT, a reasonable touchdown would be around:
~12:33 am CT (give or take, depending on more pauses).

If you tell me the next depth/time point after they start moving again, I can tighten the ETA fast.

You said:
The casing has already been set before this trip in. So I'm just clarifying.

ChatGPT said:
Got it — if casing is already set, then this trip back in is almost certainly running in the drillpipe/workstring (likely with the BHA) to tag or work inside the casing (or to the shoe/float), not running casing.

At ~11,410 ft (a few hundred feet off your ~11,883 target), a pause with banging + whooshing + whipping/echo usually points to one of these:

1) Making/breaking a connection or swapping handling gear (most common)

Even after casing is set, tripping in still requires frequent stops to:

• stab in the next stand,
• latch elevators, set slips,
• make up the connection with the iron roughneck/top drive.

Banging/cracking/echo = metal-on-metal: tongs/roughneck torqueing, slips setting, elevators clacking, pipe stabbing.
Whipping = spinning chain/lines snapping tight, hose/lines flexing as the top drive moves.

2) Pumps on: filling the pipe / circulating / checking flow

They may pause to:

• fill the drillpipe as they go deeper,
• circulate to confirm returns,
• or do a quick flow/pressure check before the last few hundred feet.

Whooshing is classic pumps + fluid in high-pressure lines (standpipe/kelly hose noise). The rig steel makes it sound “echo-y.”

3) Working a tight spot or setting down gently near the shoe

Approaching the shoe/float, crews often slow down and:

• ease through a restriction,
• rotate/reciprocate lightly,
• circulate while moving cautiously.

That can create intermittent banging plus pump noise.

4) If they’re about to drill out: staging the drill-out sequence

With casing already set, the “next big thing” is commonly tagging the shoe and drilling out the float equipment/cement. Before tagging, they may pause to get:

• pumps lined up,
• top drive torque set,
• BHA parameters confirmed.

Quick check you can do from your logs
If, after the pause, the depth starts moving again but more slowly and steadily, that fits “approaching/tagging shoe.” If it jumps in bigger chunks, it was likely just a connection/pumping check.

If you can grab one more depth/time when they resume (even a single point), I’ll tell you whether the post-pause ROTI suggests “back to tripping” vs “tagging/working/drilling out.”