Drill Collars - Gulf Engineering Services Ltd | Trinidad & Tobago
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Drill Collars

Gulf Engineering Services Ltd’s Drill Collars are integral heavy-wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties, then trepanned, drifted and threaded. Drill collars are furnished as slick or spiralled in 30 or 31 foot lengths.

Slick drill collars are supplied with the mill as-rolled surface finish. Spiralled drill collars have grooves machined in the outside surface. The spiral grooves promote even flow of drilling fluid around the collar diameter, equalizing pressure and reducing the occurrence of differential sticking.

Drill Collar Spec Sheets
PDF Spec Sheet OD
(in)		 Connection ID
(in)		 Type Nominal
(lb/ft)		 MUT
(ft-lbs)
Spec Sheet 4-1/8 NC 31 2.000 Slick 34.35 6 900 – 7 500
Spec Sheet 5 NC 38 2.250 Spiral 49.36 10 000 – 12 000
Spec Sheet 6-3/4 NC 50 2.813 Spiral 99.35 28 400 – 34 100
Spec Sheet 8-1/4 6-5/8 FH 2.813 Spiral 158.73 43 400 – 52 100
Spec Sheet 9-1/2 7-5/8 Reg 3.000 Spiral 214.41 81 200 – 97 400