Production description:

1) Standard: API Spec 7-1

2) Size: 3 1/2", 4 1/2", 5", 5 1/2"

3) Material : AISI 4145H, AISI 4340, AISI4145H Mod

The heavy Weight Drill Pipe (HWDP) was developed to provide a gradual transition from the drill collars to the drill pipe.

This HWDP helps to prevent stress concentration at the top of the drill collar. It also allow drilling at higher rpms, reducing torque and differential pressure sticking. The HWDP is intended primarily for directional drilling. As 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 HWDP appropriate for some straight-hole applications. Various combinations of HWDP, drill collars, and standard drill string can be created to meet the challenge of severe drilling conditions.

We can supply integral HWDP from 2-7/8" to 6-5/8". Also we can supply friction welded HWDP, which is assembled with AISI 1340 steel pipe and AISI 4145H or 4137H tool joints.

Mechanical properties of HWDP 

Heavy Weight Drill Pipe Specification

Quality control or assurance:
In order to keeping competition and developing, the basic is to improve any possible aspects such as company quality, we place an emphasis on elements includes controls, job management, defined and well managed processes, performance and integrity criteria and identification of records, on competence includes knowledge, skills, experience and qualifications, on soft elements includes personnel integrity, confidence, organizational culture, motivation, team spirit and quality relationship.