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	Thread as per GOST R 50864 (spec. 7)	Helice spacing S, mm (helice hand - right)	Fillet radius r, mm	Helice cutting depth S, mm
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.