Products

Drill collars

Are intended to create a thrust load on the rock destruction tool, increase rigidity and stability of the bottom of the drill string while well-drilling.

All pipes are made of alloyed structural steel, which passes a full bake cycle and control on mechanical properties and ultrasonic check.

Design types:

  • bare without grooves;
  • with elevator grooves;
  • with elevator grooves and power slips;
  • bare with riffling (flats);
  • with elevator grooves and riffling (flats);
  • with elevator and power slips grooves; with riffling (flats);
  • with elevator and power slips grooves; with one central swell.

Drill collars sizes

Diameter, mm Thread as per GOST R
50864 (spec. 7)
Helice spacing S, mm
(helice hand - right)
Fillet
radius r, mm
Helice cutting
depth S, mm
Outer, D
Openings, d
Elevator
grooves, De
Power slips
grooves, Dk
105 51 89 102 З-86 (NC31) 890 3,2 4
108 57 89 102 З-86 (NC31) 915 3,2 5
121 51 102 114 З-102 (NC38) 965 3,2 6
127 57 102 114 З-102 (NC38) 965 3,2 6
133 57 114 114 З-102 (NC38) 1065 3,2 6
146 57 130 140 З-122 (NC46) 1065 3,2 6
146 75 130 140 З-122 (NC46) 1065 3,2 6
152 57 130 140 З-122 (NC46) 1065 3,2 7
152 71 130 140 З-122 (NC46) 1065 3,2 7
165 57 146 152 З-122 (NC46) 1165 3,2 8
171 57 152 159 З-122 (NC46) 1165 4,8 8
171 71 152 159 З-133 (NC50) 1165 4,8 8
178 57 159 168 З-133 (NC50) 1600 4,8 9
178 71 159 168 З-133 (NC50) 1600 4,8 9
203 71 178 194 З-147 (5 1/2 FH) 1700 4,8 10
203 80 178 194 З-163 (NC61) 1700 4,8 10
203 100 178 194 3-171 (6 5/8 FH) 1700 4,8 10

To avoid pipe sticking in the well, riffling (type C) can be made on the surface of the drill collar. In this case, the contact area of the surface of the drill collar with the walls of the well decreases.

The supply of products with other sizes can be agreed with the customer.