3 1/8" Spiral Drill Collars Specifications 1.standard:API7-1 2.OD:79.4mm-279.4mm 3.factory directly delivery
3 1/8" Spiral Drill Collars
Drill collars is one of the most important product of hexin oil drillings which mainly used to provide bit weight to drill so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. HEXIN brand drill collars are manufactured strictly from API Spec7-1 standard. HEXIN own the leading heat treatment equipment which import for United States. The product quality and stability, the customers satisfaction is 100%.
For more than 40 years, we've been exploring and developing upon producing various oil drilling tools including Drill Pipe, Drill Collar, Heavy Weight Drill Pipe, Kelly,Pup Joint and so on. Our API drill pipes are of high physical property, for their strictly controlled processing of sulphur and phosphorus.To ensure the materials to meet even surpass the requirements of API Specification, heat treatment is on the basis of the actual chemical analysis of each heat of steel.Strict full-length inspection especially on the weld-neck region ensures the drill pipes are of no defects.
All threads are machined by CNC Lathes and inspected with API Spec standard thread gauges. To improve the galling-resistance during initial break-in and drilling operation, all threads are also phosphated or coppered, and all the roots are cold rolled. The products shall be equipped with pressed steel or plastic steel thread protectors on the connections.
Drill pipes of our company are produced in accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001, OHSAS 18001, Arnco Hardbanding Certificates and so on.
3 1/8" Spiral Drill Collars
