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The precision forged drill collar is manufactured in accordance with SY5144 and API 7 standard. The manufacturing process is that the drill collar with its encircle and bore is directly formed by precision forging by the rotary forging machine, or alternatively, that the blank for the drill collar is first forged to solid workpiece and then its encircle and bore are machined by turning and drilling operation.
The material used for the drill collar is ASTM 4145H steel produced by our works.
The drill collar won the Third Award of the Excellent Scientific and Technological Achievements of Petroleum Equipment by the State Economic Commission in 1988.
Drill Collar (Spiral Drill Collar and Non-magnetic Drill Collar) Specifications
4 1/4" to 11" OD drill collar.