Quantity | 2 - 100 |
Price | 2500 |
MOQ | 1 1 |
Port | Tianjin |
Lead Time | 35 |
Type | Drilling Collar |
Drill collar is one of the most important components of the drill string, which providing pressure on drill bits.
The production and inspection standard if API 7, API7-1 the material of the drill collar can be AISI 4145 H or Non-magnetic material.
Landrill provide you all kinds of drill collars like slick drill collars and spiral drill collars, OD sizes from 3 1/8”-11”, length from 10”-31”
Usage :
One of the most important components of the drill string is to provide drilling bit of pressure and the drill string rigid role.
Standard :
API 7, API 7-1, DS1, NS-1
Material :
AISI 4145 H or Non-magnetic material.
Types:
Slick drill collars / Spiral drill collars / Non-mag material drill collars
Size :
OD : 3 1/8”---11”, Length : 10’---31’
Connection:
API Regular, H90, PAC
1.Mechanical property of slick and spiral drill collars:
OD Range(in):3 1/8~6 3/4 7~11
Yield Strength(MPa):>758 >689
Tensile Strength(MPa):>965 >930
Elongation(%):>13 >13
Hardness(HB):285~341 285~341
Impact Test(J):>54 >54
OD Range |
Yield Strength(MPa) |
Tensile Strength(MPa) |
Elongation (%) |
Hardness (HB) |
Impact Test(J) |
|
mm |
in |
|||||
79.4~171.4 |
31/8~63/4 |
≥758 |
≥965 |
≥13 |
285~341 |
≥54 |
177.8~279.4 |
7~11 |
≥689 |
≥930 |
≥13 |
285~341 |
≥54 |
2.Mechanical property of Non-mag drill collars:
OD Range(in):3 1/8~6 3/4 7~11
Yield Strength(MPa):>758 >689
Tensile Strength(MPa):>827 >758
Elongation(%):>18 >20
OD Range |
Yield Strength(MPa) |
Tensile Strength(MPa) |
Elongation (%) |
Hardness (HB) |
Impact Test(J) |
|
mm |
in |
|||||
79.4~171.4 |
31/8~63/4 |
≥758 |
≥827 |
≥18 |
||
177.8~279.4 |
7~11 |
≥689 |
≥758 |
≥20 |
Oilfield Drill Collar Spiral Drill Collar
Product Description
Boban series 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.
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.
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
Huanjie
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
supply slick drill collars, spiral drill collars and non-magnetic
drill collars; 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.
FAQ
1) How can I
place order?
A:
You can contact us by email about your order details, or place
order on line.
2) How can I pay
you?
A:
After you confirm our PI, we will request you to pay. T/T and
Western Union are the most usual ways we are
using.
3) 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 15-25days 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.
4)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.
5)How do you
check all the goods in the production
line?
A:
We have spot inspection and finished product inspection. We check
the goods when they go into next step production
procedure.