Drill Collar

Offer Details

Offer Type:
Offer Group:	Petroleum machinery parts
Offer Post Time:	2009-12-19
Expiration Date:	2010-06-06
Details:	The drill collar functions (1) It supplies the drilling pressure on the drill bit. (2) On the compression stress conditions, it ensures the necessary strength. (3)It can reduce vibration, swinfing, and jumping of drill bit to work stably. (4)It controls well inclination. The drill collar features: Structural characteristics: Both ends of the tube directly struck screw thread, no special connections, large wall thickness(38-53 mm), weight, strong stiffness. Type: Type A(column type): Made by normal alloy steel, the cross section of inside and outside of casing are circular. Type B(spiral type): Made by normal alloy steel, the outsides of the tube have helical. Type C(non-magnetic type): Made by stainless alloy steel in low magnetic permeability, the cross section of inside and outside of casing are circular. Commonly used dimensions: 6-1/4´ , 7 ´ , 8 ´ , 9 ´ .