Specification :

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 and SY/T standards.
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’
Mechanical Property:
Slick and Spiral drill collars
OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation
(%) Hardness
(HB) Impact Test(J)
mm in
79.4^171.4 31/8^63/4 e758 e965 e13 285^341 e54
177.8^279.4 7^11 e689 e930 e13 285^341 e54

Non-mag Drill Collars:

OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness
(HB) Impact Test(J)
mm in
79.4^171.4 31/8^63/4 e758 e827 e18
177.8^279.4 7^11 e689 e758 e20

Monoblock Heavy Weight Drill Pipe (HWDP)

Size: 2 7/8�, 3 1/2�, 4 1/2�, 5�, 5 1/2�

Landrill integral HWDP is the transition zone between drill collar and drill pipe. It can not only reduce stress-formation in the connection of drill collar and drill pipe, but also reduce the wear on OD.

Products description:

Landrill integral HWDP is made from one piece of AISI 4145H solid bar, fully heat treated, all physical properties conform to API Spec 7 latest edition.
Landrill integral HWDP can easily solve problems arising in vertical holes in soft formation by replacing part of the drill collars. The advantages include:
1. Reduced torque in high-rpm, deep drilling.
2. Less trip time as compared to handling a long string of drill collars.
3. Fewer tool-joint connection failures.
4. Easy in handling and transporting to and from locations
5. Help for keeping direction of directional well.
HWDP's wear resistance hardbanding is standard on tool joints connections and central upset. Hardbanding is made by an automatic machine after preheating the pipe and is followed by stress relieving.
Standard Bands:
One 4" wear band on both pin and box end, plus one 1" band on 18°shoulder of box.
Two 3" wear bands on central upsets
The hardbanding is completely flush on both tool joints and 1/8" oversize on the central upset (fully flush on request).
The types of Hardbanding include Iron-Matrix powder alloy, Tungsten Carbide particle, and Arnco 100XT.
SFMC HWDP could be coated internally with DPC (equivalent to TK 34) as customer's request that are able to prevent corrosion and extend using time.
Mechanical Properties: Yield Strength MPa Tensile Strength MPa Elongation% Hardness BrinellHB Impact AKVJ
e758 e964 e13 285^341 Average value e54
Minimum value e47