Integral heavy weight drill pipes are manufactured from AISI 4142H-4145H modified drill collar material , thick-walled pipe called integral heavy weight drill pipe was developed to provid a gradual transition from the heavy weight drill collars to the relatively light weight drill pipe. This intermediate weight pipe has a wall thickness of approximately, and it helps prevent stress concentration at the� top of the drill collars. It also allows you to drill at higher pms, reducing torque and differential pressure sticking. It is intended primarily for directional drilling. Because it bends easily, it simplifies directional control and� minimizes connection fatigue problems common to high angle or horizontal drilling. The reduced number of pipe failures and increased drill stem service also make it appropriate for some straight hole applications.
Specification OD ID connection Body Weight
mm in mm in Style OD Inner and outer thread Upset
mm in Mmd
center area Mm
� End area
Type I� (Length is 9300mm for one piece)
ZH-J66-6 5/8FH-I 168.3 6 5/8 114.3 4 1/2 6 5/8FH 209.6 8 1/4 195.70 184.2 176.21 965KG
ZH-J55-5 1/2FH-I 139.7 5 1/2 92.1 3 5/8 5 1/2FH 177.8 7 170.7 152.4 144.5 730KG
ZH-J50-NC50-I 127.0 5 76.2 3 NC50 168.3 6 5/8 154.0 139.7 130.2 700KG
ZH-J45-NC46-I 114.3 4 1/2 71.4 2 13/16 NC46 158.8 6 1/4 145.3 127.0 117.5 585KG
ZH-J35-NC38-I 88.9 3 1/2 52.39 2 1/16 NC38 120.7 4 3/4 116.3 101.6 92.1 370KG
ZH-J29-NC31-I 73.03 2 7/8 50.8 2 NC31 104.8 4 1/8 100.4 84.1 81.0 220KG
Type II� (Length is 13500mm for one piece)
ZH-J50-NC50-II 127.0 5 76.2 3 NC50 168.3 6 5/8 154.0 139.7 130.2 945
ZH-J45-NC46-II 114.3 4 1/2 71.4 2 13/16 NC46 158.8 6 1/4 145.3 127.0 117.5 790
The wall thickness of heavy weight drill pipe is between drill pipe and drill collar. Its structure is similar with drill pipe. It is made from premium alloyed steel. Its both tool joints and middle upset are welded hardbands. Technical parameters meet with API Spec7-1 standard.
Supplier: Drill collars, integral heavy weight drill pipes, stabilizers, subs
Making of aisi 4145h alloy steel, this is a kind of dill collar which add three right out of spiral groove on the outer circle of ordinary drill collar when processing. The main effect is to reduce the drill collar wall in the area of contact and friction when working, maintain uniformity with the mud through spiral mobile, keep the balance of drill string and prevent pressure sticking. The single weight of spiral dill collar is 4% lighter than the same specification of ordinary dill collar , the two ends of the thread and the general shape are the same with drill collar. According to the form of spiral it is divided into type i and type ii. It need to be discuss.
It is made of high quality low-carbon-alloy steel. The raw material undergo a rigorous analysis of the chemical composition by forging, through the testing of mechanical properties of hardness, toughness , impact value and intergranular corrosion cracking performance in order to reach the requirement of standards, at the same time owning a good low permeability and mechanical processing performance . Magnetic permeability(mps=1íß105/4íta/m) Average¦u>r1.010 Magnetic field gradient¦í˜bín0.05ª8t It need to be discussed
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 . Api and iso standed
Supplier: Drill collars, drill pipes, square kelly, hexagonal kelly, non-magnetic drill collar, integral heavy weight drill pipe, lifting sub, cross-over sub
Supplier: Common drill collars, spiral drill collars, non-magnetic drill collars, square drill collars, integral heavy weight drill pipes, stabilizers, non-magnetic stabilizers, square drill pipes, hexagonal drill pipes, adapters, short listing connection
Buyer: Common drill collars , spiral drill collars, non-magnetic drill collars, square drill collars, integral heavy weight drill pipes, stabilizers, non-magnetic stabilizers, square drill pipes, hexagonal drill pipes, adapters, short listing connection
1.Made of 4145H alloy structural steel. 2.Production complies with the provisions under the Standard SY/T 5146-1997. Connector screws comply with the provisions of the Standard API SPEC 7-1. 3.The tube section has a larger diameter at mid length to protect the heavy weight drill pipe from wear. 4.Hardbanding and Internal Coating can be provided on customer request.
Heavy weight drill pipe is a type of drill pipe whose walls are thicker and collars are longer than conventional drill pipe. Heavy weight drill pipe was developed as an intermediate weight drill string member. It was originally developed for three reasons: 1. As a transition member to be run between heavy weight drill pipe and drill collars. 2. As a flexible weight member to be run in directional drilling. 3. As a weight member on small rigs, drilling small diameter holes. More recently, with the advent of horizontal drilling, it has found a new application being used in the curved portion of the hole below the drill collars.
