Drill Collar
- Company Name:Bobo Oilfield Supply Industry Company Limited
- Membership:Free Member
- Member Since:2010. 07.13
- Country/Region:China
- City:Beijing
- Contact:Sara Niu
- Related Keywords:drilling string, drilling tools, drilling stem, drill pipe
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Bobo Oilfield Supply Industry Company Limited
[China]
Drill Collar
BOS Industry drill collars are made from AISI 4145- modified alloy steel, heat-treated to API standards with 3-1/8" to 11" ODs.
The standard drill collar length is 31'. For outside diameters larger than 4", slip or elevator recesses can be cut according to API recommended practice RP7G. Connections are cut with standard API relief features, cold rolled and kemplated.
For enhanced resistance to corrosion, BOS Industry applies a mechanical bore treatment (RSC or roller burnishing) and shot peening on outside diameters.
BOS Industry non-magnetic drill collars are usually manufactured slick. Spiraling can be added upon request. In addition, the collars can be manufactured with a scribe line and an interface for top landing.
BOS Industry also offers a non-magnetic flex collar to be used in conjunction with MWD collars in three nominal sizes (3-1/2", 5" and 6-1/8").
Machining of end connections is done on one of BOS Industry 's CNC machines with constant profile cutting tools. Thread profile, lead, depth, taper and stand-off are constantly inspected during and after machining.
Following API gauging, thread roots are cold-rolled to improve fatigue resistance of connections.
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