Henan Shenlong Petroleum Drilling Tools Co.,Ltd is a reliable manufacturer of drill collar and heavy weight drill pipe.
We have technology consultants from MIT, they are experts of metal materials and machinery manufacturing.They give us many technology supports.
Our technicians are most from an important and famous special steel group in China. They are very professional. And the workers are very good too, most of them have long experience working in this industry and we value them very much. Without them, we can not manufacture high quality products.
We only make drill collar, heavy weight drill pipe and stabilizer which can assure the stability of final products and gain us efficiency. We can currently produce at least 5000 drill collar and heavy weight drill pipe each year. And we plan to produce even more product from next year.
We are ISO9001 Certificate Holder and We produce according to API. We manage our factory according to ISO9001:2001, from material purchasing, producing, inspecting, selling, every process we do our best to assure superior quality.
Based on the above advantage, our price is the most competitive. If you are interested in any item of our products, you can send us email or call us any time, we will be always happy to hear from you.
Materials:
Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the" as rolled" surface finish condition. Alternative surface finishes can be provided.
Trepanning and Heat treatment :
Drill collars are trepanned and drifted to API Spec 7. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements.
Traceability:
Drill collar material and process traceability are maintained from receipt of mill's certified raw material to completion of all the manufacturing. Serial numbers are die stamped on bar bodies.
Rigid Inspection Procedures:
We inspect all our drill collars to comply with API standards . These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.
Cold Rolling:
Drill collar thread roots, as well as elevator recess upper radius, are cold-rolled. Cold rolling creates a compressive recess upper radius stress condition that increases fatigue life by minimizing crack initiation.
Phosphate-coated or copper plating:
All connections are phosphate-coated to improve resistance to corrosion. We can also do copper plating according to clients' requirement.
Slip groove. elevator groove and size:
Our company offers optional slip and elevator recesses to improve handling efficiency and safety. Unless otherwise specified, slip and elevator recesses are machined in compliance with API RP 7G guidelines.
Thread protectors:
Our company offers steel and cast steel and plastic thread protectors for all drill stem products.