ROD COUPLING

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PRODUCT DETAILS

Grade T and Grade SM sucker-rod couplings are manufactured to strict quality-control standards from high-strength alloy steel. They conform to API Specification 11B. The threads of these couplings are cold formed and produced by displacement of material rather than by removal of material, as in the cut thread. Cold forming the thread results in a compressive stress at the root of the thread, giving maximum strength to the traditional weak point of cut-thread couplings.
The sprayed-metal couplings have a corrosion-resistant surface with a low coefficient of friction to reduce wear on the tubing and the coupling. These couplings are recommended for deviated wells.
Couplings are available in slim hole, full size, and oversized configurations in sizes of 5/8 through 1-1/8 in.

Mechanical Property

　Item Material Yield Strength (PSI) Hardness (HRA) Application
High Strength 00Cr12 115,000 min 58~65 PCP/ Reciprocating Lift
Stainless Steel
AISI 4135(35CrMo) 105,000 min 58~62
API Class T AISI 5140(40Cr) 80,000 min 56~62 Reciprocating Lift
AISI 8630

Dimensions, Outside Diameter

Class T, SM & High Strength Couplings
　
 5/8” 3/4” 7/8” 1” 1-1/8”
(15.88mm) (19.05mm) (22.23mm) (25.4mm) (28.58mm)
Slim Hole 1-1/4” 1-1/2” 1-5/8” 2” 2-1/4”
(31.75mm) (38.1mm) (41.28mm) (50.8mm) (57.15mm)
Full Size 1-1/2” 1-5/8” 1-13/16” 2-3/16” 2-3/8”
(38.1mm) (41.28mm) (46.04mm) (55.56mm) (60.33mm)
Oversize 　
 1-13/16” 2” 2-3/8” 　
(46.04mm) (50.8mm) (60.33mm)

Case Study & Application

Case Study I:Shengli Oilfield Binnan Well #A

Item Well Mineralization CL- H2S Start End Date Effective days Appearance Result
No. PPM PPM PPM Date
00Cr12 PR Binnan Well #A 30000 50000 150 11/18/18 Still running 760+ days No corrosion found Still Running
PR SM Binnan Well #A 30000 50000 150 2005/2/18 11/18/18 200 Multiple local corrosions found Failed
days

Case Study II:Shengli Oilfield Gudao Well #B

Item Well Mineralization CL- H2S Start End Date Effective days Appearance Result
No. PPM PPM PPM Date
00Cr12 PR Gudao Well #B 65000 30000 Slanted 11/18/18 Still running 760+ days No corrosion found Still Running
PR SM Gudao Well #B 65000 30000 Slanted 2007/6/17 11/18/18 500 Multiple local corrosions found Failed
days

Round thread casing coupling size quality and tolerance

Code Specificationgs Diameter
W mm		 Minimum Boring diameter
φ b mm		 Width of
bearing surface
b mm		 Weigth
kg
Diameter
D mm		 Short coupling
NL		 Coupling length
NL
Short coupling Coupling length
4-1/2 144.30 127.00 158.75 177.80 116.68 3.97 3.62 4.15
5 127.00 141.30 165.10 196.85 129.38 4.76 4.66 5.75
5-1/2 139.70 153.67 171.45 203.20 142.08 3.18 5.23 6.42
6-5/8 168.26 187.71 184.15 222.25 170.66 6.35 9.12 11.34
7 177.80 194.46 184.15 228.60 180.18 4.76 8.39 10.83
7-5/8 193.70 215.90 190.50 234.95 197.64 5.56 12.30 15.63
8-5/8 219.08 244.48 196.85 254.00 223.04 6.35 16.23 21.67
9-5/8 244.48 269.88 196.85 266.70 248.44 6.35 18.03 25.45
10-3/4 273.05 298.45 203.20 – 277.02 6.35 20.78 –
11-3/4 298.45 323.85 203.20 – 302.42 6.35 22.64 –
13-3/8 399.72 365.12 203.20 – 343.69 5.56 25.66 –

Non-thickening oil coupling weigth and tolerance

Code Specificationgs Diameter
W mm		 Minimum length
NL mm		 Boring diameter
φ mm		 Width of
bearing surface
b mm		 Special chamfer plane carrying
the largest diameter
Bf mm		 Weigth
kg
Diameter
D mm
1.050 26.67 33.35 80.96 28.27 1.59 30.00 0.23
1.315 33.40 42.16 82.55 35.00 2.38 37.80 0.38
1.660 42.16 52.17 88.90 43.76 3.18 47.17 0.59
1.900 48.26 55.88 95.25 49.86 1.59 52.07 0.56
2-3/8 60.32 73.02 107.95 61.93 4.76 66.68 1.28
2-7/8 73.02 88.90 130.18 74.63 4.76 80.98 2.34
3-1/2 88.90 107.95 142.88 90.50 4.76 98.42 3.71
4 101.60 120.65 146.05 103.20 4.76 111.12 4.35
4-1/2 114.30 132.08 1555.58 115.90 4.76 123.19 4.89

Outside the oil thickening coupling weight and tolerance

Code Specificationgs Diameter Minimum length
NL mm		 Boring diameter
φ mm		 Width of
bearing surface
mm		 The largest diameter of bearing surface Bf Weight
kg
Diameter
D mm		 Standard and special bevel Coupling
W mm		 Special Clearance Coupling
WC mm
Special Bevel Coupling
mm		 Special clearance Coupling
mm		 standard
oupling		 special clearance coupling
1.050 26.67 42.16 – 82.55 35.00 2.38 37.80 – 0.38 –
1.315 33.40 48.26 – 88.90 38.89 2.38 42.77 – 0.57 –
1.660 42.16 55.88 – 95.25 47.63 3.18 50.95 – 0.68 –
1.900 48.26 63.50 – 98.42 54.76 3.18 58.34 – 0.84 –
2-3/8 60.32 77.80 73.91 123.82 67.46 3.97 71.83 69.90 1.55 1.07
2-7/8 73.02 93.17 87.88 133.35 80.16 5.56 85.88 83.24 2.40 1.55
3-1/2 88.90 114.30 106.17 146.05 96.85 6.35 104.78 100.71 4.10 2.38
4 101.60 127.00 – 152.40 109.55 6.35 117.48 – 4.82 –
4-1/2 114.30 141.30 – 158.75 122.25 6.35 130.96 – 6.05 –

API buttress thread casing coupling-Dimensions,tolerances and masses

Code Specificationgs Diameter Minimum length
NL mm		 Diameter of counterbore
φ mm		 Width of
bearing surface
b mm		 Weight
kg
Diameter
D mm		 Regular
W mm		 Special clearance
W mm
Regular Special clearance
1 2 3 4 5 6 7 8 9.00
4-1/2 114.30 127.00 123.82 225.42 117.86 3.18 4.55 3.48
5 127.00 141.30 136.52 231.78 130.56 3.97 5.85 4.00
5-1/2 139.70 153.67 149.22 234.95 143.26 3.97 6.36 4.47
6-5/8 168.28 187.71 177.80 244.48 171.83 6.35 11.01 5.65
7 177.80 194.46 187.32 254.00 181.36 5.56 10.54 6.28
7-5/8 193.68 215.90 206.38 263.52 197.23 7.94 15.82 9.29
8-5/8 219.08 244.48 231.78 269.88 222.63 9.52 20.86 10.80
9-5/8 244.48 269.88 257.18 269.88 248.03 9.52 23.16 12.02
10-3/4 273.05 298.45 285.75 269.88 276.61 9.52 25.74 13.39
11-3/4 298.45 323.85 – 269.88 302.01 9.52 28.03 –
13-3/8 399.72 365.12 – 269.88 343.28 9.52 31.77 –
16 406.40 431.80 – 269.88 410.31 9.52 40.28 –
18-5/8 473.08 508.00 – 269.88 476.99 9.52 62.68 –
20 508.00 533.40 – 269.88 511.91 9.52 50.10 –