drill collar, API 7 drill collar, drilling tool

Product Description

Standard: API Spec 7 Material: AISI ***5H Alloy Steel or Non-magnetic material Specification: OD: 3 1/8”**1” Length: *0’**2’ Usage: The Drill Collar is used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill. For more information of Drill Collar, please refer to Technical Support. Description: Slick Drill Collars Drill collars are made of AISI ***5 H or ***5 H modified alloy steel, which are trepanned and drifted to API Spec. 7. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec. 7 requirements. A hardness range of ******1 Brinell Hardness and Charpy “V” notch minimum impact strength of *0ft-lb at *0F are guaranteed one inch below the surface. Spiral Drill Collars We manufactures not only slick Drill Collars, but also spiral Drill Collars with Slip, Elevator recesses and hardbanding. Our drill collars are available in lengths from *0 to *2 feet and outside diameter from **1/8" to *1". Spiral drill collars are complete product line. Spiral grooves let mud circulate freely around the drill collar to equalize pressure and prevent a seal from forming. The reduces the occurrence of differential sticking without spiral. Spiral collars are wide used because of their maintenance features. The special grooves decrease the volume of the contact between the well side and the pipe, it leads to the decrease of the “tack” of the pipe and to turning of the drill pipe string. The weight of round drill collars will be reduced approximately **6% by spiral conversion. Non-magnetic Drill Collars Materials of the Non-magnetic drill collars are from chrome manganese, low carbon alloy obtained by combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.