1.Polish rod is a kind of special sucker rod connected with sucker rod and beam hanger. It is at the top of sucker rod, need to bear the most strength,so with bigger diameter and higher steel grade than sucker rod, and the surface is very smooth.
2.Main function:
Combined with packing set in packing box to seal wellhead and prevent oil、gas、water disclosure.
Interim connector between sucker rod and mule head hanger
Finishing indicator diagram test.
Complete various wellhead operation, such as pump striking, regulating pump setting.
|
Nominal value |
Rod body diameter D |
Length Lmm士 50mm （Lft 士 2in) |
Thread nominal diameter mm（in） |
mm (in） Outer thread shoulder outer diameter |
Suitable sucker rod size mm (in) |
|
29 |
28. 6 (11/8） |
2438, 3353, 4877, 6707, 7315, 7925 |
24 （15/16） PR |
一 |
16 (5/8) |
|
27 （1 1/16） PR |
一 |
19 (3/4) |
|||
|
29 |
28. 6 （11/8）rod-upset on one end |
2438, 3353, 4877, 6707 , 7315, 7925 (8. 11, 16. 22 , 24 , 26) |
24 (15/16 ) SR |
31.8+0.127-0.254 (1.250+0.005-0.010) |
16 (5/8) |
|
27 (1 1/16 ) SR |
38.1+0.127-0.254 (1.500+0.005-0.010) |
19 (3/4) |
|||
|
32 |
31.8（1 1/4） |
3353, 4877， ,6707，7315, 7925 , 9144, 10973 |
30 (1 3/16 ) PR |
一 |
22(7/8) |
|
32 |
31.8（1 1/4）rod-upset on one end |
3353, 4877， ,6707，7315, 7925 , 9144, 10973 |
30 (1 3/16 ) SR |
41.3+0.127-0.254 (1.625+0.005-0.010) |
22(7/8) |
|
38 |
38. 1 (1 1/2） |
4877, 6707，7315, 7925. 9144. 10973 |
35（1 3/8）PR |
一 |
25(1) |
|
38 |
38. 1 (1 1/2）rod-upset on one end |
4877, 6707，7315, 7925. 9144. 10973 |
40（1 9/16）SR |
57.2+0.381-0.381 (2.250+0.015-0.015) |
29(1 1/8) |
● Mechanical Property OF Steel Polished Rod
|
GRADE |
Minimum Yield Strength(0.2% Residual Deformation） |
Minimum Tensile Strength |
Maximum Tensile Strength |
Elongation200mm% |
Reduction of Area Z% |
HRC |
HB |
Fatigue Life |
|||
|
|
psi |
MPa |
psi |
MPa |
psi |
MPa |
≥13 |
≥50 |
/ |
/ |
≥1.0X106 |
|
C |
60000 |
414 |
90000 |
621 |
115000 |
793 |
≥13 |
≥50 |
/ |
/ |
/ |
|
D |
85000 |
586 |
115000 |
793 |
140000 |
965 |
≥13 |
≥50 |
/ |
/ |
/ |
|
KD |
85000 |
590 |
115000 |
795 |
140000 |
965 |
≥13 |
≥50 |
/ |
/ |
/ |
|
H |
115000 |
795 |
140000 |
965 |
173339 |
1195 |
≥13 |
≥45 |
/ |
/ |
/ |
|
EHL |
/ |
/ |
188500 |
1300 |
217500 |
1500 |
/ |
/ |
≥50 |
≥320 |
≥2.5X106 |
|
Note: When the minimum yield strength cannot be measured, it should be considered to be processed into standard sample and install extensometer to measure. |
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A It is generally made of high quality carbon steel, which can reach the mechanical properties of the table |
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● Chemical Composition OF Commonly Used Sucker Rod
|
AISI |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
V |
Cu |
Al |
|
4130 |
0.26-0.33 |
0.17-0.37 |
0.4-0.7 |
≤0.025 |
≤0.025 |
0.8-1.1 |
≤0.3 |
0.15-0.25 |
/ |
≤0.2 |
/ |
|
4140 |
0.38-0.45 |
0.17-0.37 |
0.5-0.8 |
≤0.025 |
≤0.025 |
0.9-1.2 |
≤0.3 |
0.15-0.25 |
0.04-0.09 |
≤0.2 |
/ |
|
4142 |
0.38-0.45 |
0.17-0.37 |
0.5-0.8 |
≤0.025 |
≤0.025 |
0.9-1.2 |
≤0.3 |
0.15-0.25 |
0.04-0.09 |
≤0.2 |
/ |
|
4330 |
0.3-0.35 |
0.15-0.35 |
0.8-1.1 |
≤0.025 |
≤0.025 |
0.8-1.1 |
1.65-2.0 |
0.2-0.3 |
0.05-0.10 |
≤0.2 |
/ |
|
4720 |
0.19-0.23 |
0.15-0.35 |
0.85-1.05 |
≤0.025 |
≤0.025 |
0.8-1.05 |
0.9-1.2 |
0.22-0.30 |
0.02-0.05 |
0.40-0.60 |
/ |