8/2/2019 ROP Suddenly Dropped While Drilling

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ROP suddenly dropped while drillingI am drilling 17-1/2" section at depth of 5000 ft..........ROP was 20 ft/hr which suddenly dropped to 3.5 ft/hr...........Ihave changed bit and also treated mud to a great extent but no improvement so far......can any one suggest a solutionto this problem.

Lithology we are drilling is interbedded sand and clay (clay is sticky)

Drilling parameters Before afterRPM 105-115 105-130WOB 8-14 klb 15-28 klbGPM 850-900 900-930

Mud parameters

Depth/TVD (ft) 4536/4536 5024/5024Mud Weight /Temp (lb/gal) 11.0@80 11.0 @ 80Funnel Viscosity (s/qt) 43 44R600/R300 59/38 64/43R200/R100 28/18 29/20R6/R3 4/3 5/4PV (cP) 21 21YP (lb/100ft) 17 2210s/10m/30m Gel (lb/100ft) 4/20/34 5/19/29API Fluid Loss (cc/30min) 9 6.8Cake API/HTHP (1/32") 1 1Retort Solids (%Vol) 17 17Oil/Water (%Vol) 0/83.0 1.0/82.0MBT (lb/bbl) 20 9pH / Temp 10.0@80 10.0@80Alkal Mud (Pm) 0.15 0.2Pf/Mf 0.1/0.5 0.2/0.7Chlorides (mg/L) 27000 25500Hardness (Ca++) 120 120KCl (%) 3 3K+ ions (mg/l) 16000 158004 days ago

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HYTHAM HYTHAM A. you have to change the drilling parameter and decrease WOB , also what the kind of BITalso when you check the the BIT did you find any Bit balling and what about the BIt condition in general4 days ago

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8/2/2019 ROP Suddenly Dropped While Drilling

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abdulla

abdulla E.

i agree with fatah,,,,check the bit condition and what type of bit(tooth)4 days ago

Hanjo Hanjo L. any variation in pressure before and after the decrease in rop ???4 days ago

John John A. The first thing I would check is what is the HSI? If possible increase the pump rate. If it is bit ballingthere are a number of things to try before pulling the bit, in the first instance I would try a nut plug pill, if no goodtry a seawater or freshwater pill, if everyone is brave you can also try a caustic pill but some have reported that thiscan destabilise your wellbore.....good luck.4 days ago

MUHAMMAD MUHAMMAD A. At first, i was using five bladed 19mm cutter size PDC bit, with 8 X 13/32 nozzles (HSI = 1.4-1.9 at different flow rates) it was giving me 20 ft/hr.....suddenly ROP dropped when beds of sticky claystarted......before pulling the bit, I 'd pumped a detergent pill which didn't work. than I Pumped a saturatedKCl/water pill and started adding crude oil in mud. when I saw there was no improvement, decided to POOH andcheck the bit.On POOH, string stabs were 80% balled up (had 3 stabs in strng NB, 30ft, 60 ft) and NB s tab and bit were 30%balled up, bit had errosion around its teeth and due to this I didn't dare to run it again. I didn't had any five bladedbit, so ran six bladed 19 mm bit with which all the story was repeated once again.

Again bit was pulled out and was only 10% balled up. then I RIH tricone bit (IADC 135)...now this bit is performingbetter than previous bits... in sand it is drilling @ 8-10 ft/hr and in clay @ 3-4ft/hr.3 days ago

Saravana

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Saravana K. For 17 1/2 section hole YP is looking to be very low and your PV is greater than Yp this shows yourmud system have more solids and solid percentage is also looking quite high . so try 2 reduce the PV which in turnwill give u good wall formation and increase your Yp too.....3 days ago

MUHAMMAD MUHAMMAD A. Thanks saravana,Can you suggest a value.....how much i should increase the yp...... .as you can see yp has been increased from 17 to22.......althoug with 17 yp, everything was going fine before the problem occured........Solids %age is due tobarite....as MBT has been reduced to 7.5 (Mud is in transition between Gell mud and KCl polymer).2 days ago

Saravana Saravana K. Dear Mohammed I can give you the graph which contains optimum PV and Yp values. I think yourhike in Pv is not only of baryte because your W/L values are also looking quite high2 days ago

MUHAMMAD MUHAMMAD A. thanks Saravana.........kindly send me the graph at abdulrehman302@yahoo.com2 days ago

Oddgeir Oddgeir H. 25 kg/m3 Cl- gives 53 kg/m3 KCl. 16 mk/m3 K+ gives 30 kg/m3 KCl.You are experiencing ionic exchange with Na+ in formation (clay). From a very low KCl concentration.pH of 10 sounds high for a reactive clay.

Nut plug pills may provide some effect, as may soaking the bit in neat brine for a while. Be careful, you don`t want

to get stuck in swelling clay (stabs balled up).

You could try to vary WOB and RPM, but with above properties I`d belive you would need to decrease pH andincrease KCl.

Oddgeir1 day ago

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Oddgeir

Oddgeir H.

Could "mod" please inform me as to why "Your comment has been submitted for review"?Muhammad needs realtime solutions. Not next week!

Oddgeir1 day ago

Saravana Saravana K. Dear Muhammad Graph forwarded to your mail1 day ago

MUHAMMAD MUHAMMAD A. thanks a lot saravana, I 'll check it out and will work accordingly

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