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 AISI 4145H modified
steel, and are supplied in the "as rolled" surface
finish condition. Alternative surface finishes are
available.
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
FAQ
How can I place
order?
A: You can contact us by email about your order
details, or place order on line.
How can I pay you?
A: After you
confirm our PI, we will request you to pay. T/T (HSBC
bank), L/C, D/P, Western Union are the most usual
ways we are using. If you want to use other way,
please tell me, we can discuss.
What’s the order procedure?
A: First we discuss order details, production details
by email or TM. Then we issue you an PI for your
confirmation. You will be requested to do pr-epaid
full payment or deposit before we go into production.
After we get the deposit, we start to process the
order. We usually need 7-15days if we don’t have the
items in stock. Before production has been finished,
we will contact you for shipment details, and the
balance payment. After payment has been settled, we
start to prepare the shipment for you.
How do you take care
when your clients received defective
products?
A: replacement. If there are some defective items, we
usually credit to our customer or replace in next
shipment.
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