Materials:
The non-magnetic products of Dongying Lake is made from high-class low carbon stainless steel, and completely meets the requirement of API Spec 7-1 and SY/T5144 Standard. It has good low magnetic permeability, high mechanical property and perfect enduring intergranular corrosion cracking performance. It is mainly used for the inspection in the process of petroleum drilling, and the structure is the same with the ordinary drill collar.
Trepanning and Heat Treatment:
Drill collars are trepanned and drifted to API Spec 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7-1 requirements. A hardness range of 285-341, Brinell hardness and Charpy "V" notch minimum impact strength of 40 ft-lb at 70 F are guaranteed one inch below the surface.
Traceability:
Drill collar material and process traceability are maintained from receipt of the mill's certified raw material to completion of manufacturing. Serial numbers are die stamped on bar bodies.
Rigid Inspection Procedures:
We inspect all our drill collars to ensure compliance with API SPEC 7-1 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 or copper plated to improve resistance to corrosion.
Slip Groove, Elevator Groove and Size:
Lake 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 spec 7-1 guidelines.
Thread Protectors:
Our company offers steel, cast steel and plastic steel thread protectors for its drill stem products.
We supplyslick drill collars,spiral drill collarsandnon-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers\' request. Materials: Trepanning and Heat Treatment: ...
There are different kinds of drill collars,including round drill collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.Ordinary drill collar is the circular cross section, the center has a water hole,the wall thickness is larger,the nozzle is ...
We supply slick drill collars, spiral drill collars and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers\' request. Materials: Drill collars are manufactured from ...
Non magnetic drill collar Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,in order to make the dill head to keep right trace . If ...
Non-Magnetic Drill Collar Titanium alloy Non -magnetic drill collars 1.Material: GR5 Ti-6Al-4V, TC4, TC11 2.Standard: API 3.Property Non -magnetic drill collars mainly uesed in the field of petroleum . It has an excellent physical mechanical properties. For example: high ...
Non magnetic drill collar Made of AISI4145H alloy steel, drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure and weighting to dill head ,in order to make the dill head to keep right trace . If ...
Grade:low carbon stainless steel Technique:Seamless non-magnetic drill collars 1.standardAPI Spec 7 and SY/T5114 2.competitive price 3.delivery promptly 4.high quality service ...
285 20 110,000 100,000 285 18 120,000 110,000 Brinell Hardness Elongation, Minimum, With Gauge Length Four Times Diameter percent Drill Collar OD Range,inchees Minimum Yield Strength psi Minimum Tensile Strength psi Mechanical Properties and Tests Standard Non-magnetic Drill ...
Usage:drilling Technique:forging Alloy Or Not:Is Alloy Place of Origin:Shandong China (Mainland) Outer Diameter:80-300mm It is used between the drill pipe and the bit in the drill stem. ...