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Vigor Drilling is one of pioneer Downhole Drilling Stabilizers manufacturers in Oil industry. Our Downhole Drilling Stabilizers Drill Collar/Slick Drill Collar/standard Drill collar/Spiral Drill Collar/Non magnetic Drill collar/Drill collar hollow bar, all Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit for drilling and keeps the drill sting in tension. Mill test certificate conformance to API Spec. 7-1, NS-1, DS-1 and Customer requirements. Our company is the high quality drill collars manufacturers.Slick Non magnetic Drill collar/ Non magnetic Spiral Drill collar/Flex Non magnetic Drill collar, they are function as housing for the MWD tools and provide weight for drilling string.China Vigor’s Drill Collar/Spiral Drill Collar, materials include AISI 4145H, AISI4145H modified steel and Non-magnetic. Drill collars type they are Spiral Drill collar,Slick,Flex and with Slip and /or Elevator Recess.Features and Benefits:1. API stress relief groove pin connection; API Bore back Box Connection.2. Cold Rolling Thread roots—to improve fatigue resistance of connection.3. Phosphate coated connections- to prevent corrosion and galling upon initial make-up.4. A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;Special Features:1.Spiral Grooving- to avoid differential pressures sticking in the hole.2.Stress Relief Groove
