Hilong Petroleum Pipe Co., LLC
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Hilong - Drill Collars
The Drill Collar is a thick-walled drilling tool that applies bit pressure to enhance drilling.
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- Size (OD): 3-1/8" to 11"
- Type: Slick drill collar, spiral drill collar, non-magnetic drill collar
- Drill collar speci?cation: API Spec 7-1, API Spec 7-2, API RP 7G, NS-1, DS-1
- Other proprietary products of Hilong that applicable to deep well and harsh environment drilling