Multiple-opening circulation sub

Circulation sub is a multiple-opening circulation sub used to protect the downstream BHA components during pumping of drilling fluids. It switches drilling fluid flow path from the ID of the string to the annulus.

Possible applications of the sub: pumping lost-circulation material for lost circulation; spotting acid; replacement of fluid during workover/completion operations without complicated and expensive POOH.

Technical specification

Parameter/ Size KC54-S KC75-S KC89-S KC105-S KC120-S KC172-S KC178-S KC210-S KC240-S
OD, mm 54 75 89 105 121 172 178 210 240
ID, mm 8 16 25,5 31 32 32,5 32,5 38 38
Overall length, mm 1 270 1676 1826 1864 2532 3014 3027 3127 3133
Body length, mm 1 220 1600 1750 1775 2430 2900 2900 3000 3000
Pin connection NC-16 NC-23 NC-26 З-86
(NC 31)
З-102
(NC 38)
З-133
(NC 50)
З-147
(5 1/2 FH)
3-152 (6 5/8 Reg)
3-171 (6 5/8 FH)
7 5/8 Reg
Box connection NC-16 NC-23 NC-26 З-86
(NC 31)
З-102
(NC 38)
З-133
(NC 50)
З-147
(5 1/2 FH)
3-152 (6 5/8 Reg)
3-171 (6 5/8 FH)
7 5/8 Reg
Activation ball,
Diameter, mm (inch)
15,9
(5/8”)
21 31,8
(1 1/4”)
31,8
(1 1/4”)
38,1
(1 1/2”)
50,8
(2”)
50,8
(2”)
63,5
(2 1/2”)
63,5
(2 1/2”)
Deactivation ball,
Diameter, mm (inch)
11,1
(7/16”)
19,05
(3/4”)
28,575
(1 1/8”)
28,575
(1 1/8”)
35,719
(1 13/32”)
34,9
(1 3/8”)
34,9
(1 3/8”)
44,4
(1 3/4”)
44,4
(1 3/4”)
Deactivation
pressure, kgf/cm²
155 155 147,6 147,6 147,6 147,6 147,6 155±20 155
Number of ports 3 2 2 2 2 2 2 2 2
Dia of ports, mm 9,1 16 17,3 17,3 27,9 27,9 27,9 34 34
Max. flow rate
of drilling fluid, l/s
4 5 12 12 20 38 38 56 70
Drilling fluid density,
kg/m3, max.
1 600 1600 1600 1600 1600 1600 1600 1600 1600
Drilling fluid sand
content, %, max.
1 1 1 1 1 1 1 1 1
Number of cycles 5 5 5 45 45 45 45 45 5
Max. tensile
load, kgf
52 300 70 000 100 000 4 4 5 5 5 730 000
Weight, kg 17,6 48,8 97 100000 125000 250000 300000 450000 (З-171)
325000 (З-152)
892

Features & Benefits

  • Original design allows pumping of aggressive fillers and increasing circulation.
  • Effective during horizontal and extended-reach drilling
  • Enables multiple pumping of all types of lost-circulation and plugging materials in areas of lost circulation.
  • Improved hole cleaning.
  • Compatible with salt-saturated muds.
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