Main feature:
A. The drill rods comply with theprovisions ofAPI SPEC 5D & API SPEC7.
B. The grade of steel are determinedaccording to the requirements of Group 1 & Group 3 of API SPEC5D.
C. Drill pipe joints at the samelevel comply with the provisions under the Standard API SPEC7.
Drill PipeFeature:
A. High precision in size andshape
B. Good low temperaturetoughness
C. Excellent comprehensive mechanicalproperties
D. High connection strength andsealability
E. Large inside diameter of tooljoint
F. Hightorqueresistance
G. High fatigue strength and longfatigue life
Internal CoatingFeature:
A.High abrasion resistance and lowfriction factor
B. Good adhesion andflexility
C. High application temperature andpressure
D. High hardness and impactresistance
E. Good corrosionresistance
Detail Mechanical Property of theDrill Pipe:
Group | Grade | YieldStrength | TensileStrength |
Minimum | Maximum | Minimum |
psi | Mpa | psi | Mpa | psi | Mpa |
1 | E-75 | 75000 | 517 | 105000 | 724 | 100000 | 689 |
3 | X-95 | 95000 | 655 | 125000 | 862 | 105000 | 724 |
G-105 | 105000 | 724 | 135000 | 931 | 115000 | 793 |
S-135 | 135000 | 931 | 165000 | 1138 | 145000 | 1000 |
HardbandingFeature:
A. Good balance between antiwear andfriction-reduction
B. The wear rate is less than 6% ofthat of bare tool joint, which can prolong 3 times of the
tool joint servicelife
C. Good property offriction-reduction, which can reduce the casing wear to the least, and its
wear to casing is less than 11%of that of bare tool joint
D. Reduce the torque of drillingstring
E. Good weldablity with little splashand good rewelding preformance
F. Friendly toenvironment