API Drill Collar Spiral Drill Collar and non magnetic drill 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

.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

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.

Product Application
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 smaller, the weight of per unit length is greater than the size of drill pipe almost 4- 5 times .The majority of drill collar is thread processing directly on the pipe body , but some of them also use the replaced joint.

Features

(1)Eccentric-weight drill collar is an effective anti-deviation drilling tool,with high drill pressure used in oblique areas,rectifying oblique as well.

(2)When drilling directional wells eccentric-weight drill collar is an effective tool to reduce oblique or straighten the well hole using high drilling pressure.

(3)Eccentric-weight drill collar has the advantages of simple structure,convenient use,connected directly to common drill collar without centralizers,greatly convenient for sinking in,fishing and milling operations.

(4)Eccentric-weight drill collar runs downhole safely,danger of leakage or bit freezing hard to appear.

(5)Pay much attention to avoid mud balling and prevent effect of anti-deviation .

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.