Any pointers will be greatly appreciated.
Issue: Surface rotary torque maxes @ 30,000 ft-lbs once landed & 2000´ in lateral
Hole size: 8 /2” DP: 5” #19.5 S-135
Profile: surf nudge to 6 deg & bck to vertical”¦KOP ~ 10,000, 10/100 DLS, land 94 deg ~ 11,000, 2-D well, dropping to 92 deg by TD ~ 18000'
Curve & lateral bha: 5 bladed PDC, Motor (2deg fxd bend), MWD, DP---OBM
Torque in vertical: ~16K ft-lbs”¦once we land out torque goes up to ~24K & to ~30K around 2000´ into lateral. Off -btm torque~22K
Can we eliminate hole cleaning as torque goes back up when on btm?...could it buckling?...is it the agressive plan??..any ideas or pointers to check where this excess torque could be coming from?
Luke: Thanks...The torque limiter is set to 30K..so we keep backing off params when we hit the limit...good pointers there on considering raising the limit or including some HWs if buckling ..will look into that.
Ian: Thanks for the pointers...BHA: we did not have any DC or HWDP in bha..however running lightened DP might be an option to think...Geometry change: seriously looking into this one...plan to be less aggressive on the curve..should have some dh vibration data soon to look into..
We deal with high torque on our ERD wells and where our planning and modelling predicts an issue we work up contingencies. From the very limited info, here's some thoughts:
1. Immediate fixes (you've likely tried these, but I've added for completeness - start simple)
1A.Mud Lubricity: limited gains in OBM, but may get you below, increase oil water ratio or use additive.
1B. WOB, accept a lower WOB if it drillsahead
2. Fixes on the rig
2B. Reduce BHA weight (I don't see any collars, so might not be possible). Use less HWDP?
2C. Switch to tri-cone bit, lower reactive torque
2D. Use lighted DP in HZ section
3. Other investigation areas
I have assumed that Tq is being generated by geometry, friction and weight of drilling string components. It is not uncommon to see a step change in Tq due to vibration. Is there anything to suggest this; previous wells OK, erratic Tq, polished DP?
If vibration is suspected, then it's the usual vary parameters, change contact points, assess stiffness. You may not be able to solve this on the rig, or even this well. It may require some extra design engineering.
There is a little innovative Drilling Tools company in New Zealand, TD Tech, that have some mould on stabilisers for DP that have reduced Tq in their trails. Geoff Murray is behind it and as many of you will know, Geoff designed the Lo-TAD centralisers which became step change enablers reducing drag in ERD wells and (Austoil, bought by Weatherford).
Please confirm where Tq is originating, before jumping to a tool solution. I'd also have a look at you DLS and see if you can reduce sideforce, which is likely adding to parasitic drag.
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