Structural Features
1.Thejoint adopts coupling connection, and connection strength reaches or exceeds tube body.
2.The improved buttress thread has high connection strength and relatively simple processing.
3.The primary seal adopts female/male buckle sphere radial seal structure, and has good sealing effect.
4.It adopts -150 reverse torque shoulder, improving bearing capacity of the joint.
5.The inner wall of tube body is level with that of coupling.
6.Surface treatment
External thread: Without surface treatment
Internal thread: Phosphating or copper plating
Service Performance
1.Connection strength—the thread adopts improved buttress thread type, and can have constant strength as tube body.
2.Sealing property—primary seal of female/male buckle sphere and auxiliary seal of torque shoulder make the joint have multiple sealing structures, and high sealing reliability, and can provide internal pressure resistance corresponding to tube body
3.Make the joint have strong compression resistance, bending resistance, and over-torsion resistance, and maintain surface pressure of shoulder surface under bending and corresponding load.
4.Inner flat design—effectively reduce turbulence of gas or liquid in pipeline, and make energy loss minimum.
5.Easy screwing—screw by position control (triangle) and torque control, facilitate oil field operation.
6.Thread gluing prevention—allow multiple screwing on and off.
7.Easy fastening—the top of oil tube is parallel to pipe axis, ensuring easy and accurate fastening.
Inspection Tool and Accessory Supply
1.Ordinary inspection items for taper, tooth height and screw pitch use API measuring tools.
2.Diameter and length of sealing surface are measured by special tools.
3.Standoff is measured by API gauge, only needing appropriate treatment. The inspection tool has accurate measurement and convenient use, and facilitates oil field inspection and acceptance; the accessories are supplied timely by factory in the most rapid way.
Application Range
LEADING special thread is applied to the following conditions:
Medium and high pressure gas well
High pressure fracture oil pipe
High pressure oil well
Deep well and ultra deep well
Thermal production well
|
O.D.
In
mm
|
Nominal
Weight
Kg/m
|
Grade
KSI
|
W.T.
mm
|
Drift
mm
|
Coupling
O.D.
mm
|
Collapse
Strength
Mpa
|
Minimum Internal
Yield strength
Mpa
|
Make up Torque
|
|
Minimum
N-m
|
Optimum
N-m
|
Maximum
N-M
|
|
2-3/8
60.3
|
6.90
|
J55
N80
C90
T95
P110
|
4.83
|
48.27
|
73.0
|
54.81
80.31
92.58
97.71
112.47
|
54.12
76.41
88.52
92.65
107.22
|
1380
1910
2170
2170
2430
|
1570
2160
2450
2450
2760
|
1730
2380
2800
2800
3030
|
|
8.60
|
N80
C90
T95
P110
|
6.45
|
45.03
|
73.0
|
103.33
115.54
127.12
146.97
|
102.15
115.24
120.48
140.15
|
2030
2410
2410
2620
|
2230
2610
2610
3210
|
2450
2900
2900
3200
|
|
2-7/8
73.0
|
9.50
|
N80
C90
T95
P110
|
5.51
|
59.61
|
88.9
|
76.01
84.35
87.1
99.98
|
74.18
85.01
88.46
99.21
|
2930
3460
3460
3890
|
3260
3840
3840
4330
|
3530
4210
4210
4730
|
|
11.50
|
N80
C90
T95
P110
|
7.01
|
56.61
|
88.9
|
94.42
106.25
111.48
132.15
|
94.21
106.12
106.55
130.81
|
3040
3510
3510
4030
|
3450
3940
3940
4520
|
3740
4300
4300
4930
|
|
12.80
|
N80
C90
T95
P110
|
7.82
|
54.99
|
88.9
|
104.52
1116.77
124.37
146.07
|
104.45
115.25
122.84
142.56
|
3470
3900
3900
4610
|
3840
4400
4400
5120
|
4180
4830
4830
5580
|