Drill-stem subs is a necessary part in oil, natural gas, coal drilling. It is an important
component in drill column. It plays the function of connection and transition in drilling
tools of different specifications.
The company can manufacture different kinds of Drill-stem subs with different
specifications and lengths that connect with drill collars, drill pipes, kellies, and water
taps. Also can provide polished blanks of joints. The drill column transition joints are
made of quality alloy steel through special heat treatment. Have the features of strong
strength, good toughness, and long usage life. Surface of screw is copper-plated or
phosphated. Good adhension-prevention. Mechanical feature meets the requirements
in SY/T5200 and in API Spec7.
1. Material
36CrNiMo4, 37CrMnMo4H1, 40CrMnMo, 40CrNiMo
2. Manufacture standards of drill column transition joints
The production process is strictly carried out according to related standards and
customers' requirements.
1. SY/T5200 Drill-stem subs
2. API Spec7 revolve drill column component's norm
3. Special demands by customers
3. Material pipe joint's mechanical feature
Size of external diameter mm(in) |
σbMPa |
σ0.2MPa |
δ4% |
AkvJ |
HB |
79.4~174.6
(3 1/8 - 6 7/8) |
≥965 |
≥758 |
≥13 |
≥54 |
≥285 |
177.8 ~279.4
(7-11) |
≥931 |
≥689 |
≥13 |
≥54 |
≥285 |
4. Material pipe jointspecification and model
1. Kinds of transition joints
Kinds |
Names |
Upper Connection Piece |
Lower Connection Piece |
Models |
1 |
Kelly Transition ( Protection) Joint |
Kelly |
Drill Pipe |
A-Model or B-Model |
2 |
Drill Pipe Transition Joint |
Drill Pipe |
Drill Pipe |
A-Model or B-Model |
3 |
Over-Transition Joint |
Drill Pipe |
Drill Collar |
A-Model or B-Model |
4 |
Drill Collar Transition Joint |
Drill Collar |
Drill Collar |
A-Model or B-Model |
5 |
Drill Bit Transition Joint |
Drill Collar |
Drill Bit |
A-Model or B-Model |
6 |
Water Tap Transition Joint |
Water's Tap lower joint |
Kelly |
C-Model |
7 |
Salvage-Purpose Transition Joint |
Kelly |
Drill Pipe |
C-Model |
Drill Pipe |
Salvage tool |
C-Model |
Note: Drilling tools which are connected with transition joints can be A-Model or B-Model if their diameter differences are larger than 15mm ( except for water tap transition joints and salvage-purpose transition joints), and when the well's depth is lower than or equal to 2000m. When the well's depth is larger than 2000m, adopts B-Model transition joints. |
2. Drill-stem subs's dimension and specification
Drill Pipe |
O.D.( D1,Dm , Du) |
Chamfer angle diameter Df |
I.Dd |
Drill Pipe Joint's Code |
Torsional strength ratio between joint with outer screw and pipe
|
Basic Dimension |
钢级 |
Basic Dimension |
Limiting Deviation |
Basic Dimension |
Limiting Deviation |
Basic Dimension |
Limiting Deviation |
60.3
|
E |
85.7
|
+0.8
-0.8 |
83.0
|
+0.4
-0.4 |
44.5 |
+0.4
-0.8 |
NC26-E (2³/8IF-E) |
1.10 |
X |
NC26-X
(2³ /8IF-X) |
0.87 |
G |
NC26-G (2³/8IF-G) |
0.79 |
73.0
|
E |
104.8 |
100.4 |
54.0 |
NC31-E (2³/8IF-E) |
1.03
|
X |
50.8 |
NC31-X (2³/8IF-X) |
0.90 |
G |
NC31-G (2³/8IF-G) |
0.82 |
S |
111.1 |
41.3 |
NC38-S (2³/8IF-S) |
0.82 |
88.9 |
E |
127.0 |
116.3 |
68.3 |
NC38E
(2³/8IF-E) |
0.98 |
X |
65.1 |
NC38X
(2³/8IF-X) |
0.87 |
G |
61.9 |
NC38G
(2³/8IF-G) |
0.86 |
S |
54.0 |
NC38-S (2³/8IF-S) |
0.80 |
E |
65.1 |
NC38E
(2³/8IF-E) |
0.97 |
X |
61.9 |
NC38X
(2³/8IF-X) |
0.83 |
G |
54.0 |
NC38G
(2³/8IF-G) |
0.90 |
139.7 |
139.7 |
127.4 |
57.2 |
NC40G
(2³/8IF-G) |
0.87 |
101.6 |
E |
152.4 |
145.0 |
82.6 |
NC46-E (4IF-E) |
1.23 |
X |
NC46-X (4IF-X) |
0.97 |
G |
NC46-G (4IF-G) |
0.88 |
S |
76.2 |
NC46-S (4IF-S) |
0.81 |
114.3
|
E |
168.3 |
154.0 |
95.3 |
NC50-E
(4IF-E) |
1.23 |
X |
NC50-X
(4IF-X) |
0.97 |
G |
NC50-G
(4IF-G) |
0.88 |
S |
88.9 |
NC50-S
(4IF-S) |
0.81 |
E |
92.1 |
NC50-E
(4IF-E) |
1.02 |
X |
88.9 |
NC50-X
(4IF-X) |
0.96 |
G |
NC50-G
(4IF-G) |
0.86 |
S |
76.2 |
NC50-S
(4IF-S) |
0.87 |
127.0 |
E |
168.3 |
+0.8
-0.8 |
154.0 |
+0.4
-0.4 |
95.3 |
+0.4
-0.8 |
NC50-E
(4IF-E) |
0.92 |
X |
88.9 |
NC50-X
(4IF-X) |
0.86 |
G |
82.6 |
NC50-G
(4IF-G) |
0.89 |
S |
69.9 |
NC50-S
(4IF-S) |
0.86 |
E |
88.9 |
NC50-E
(4IF-E) |
0.86 |
X |
76.2 |
NC50-X
(4IF-X) |
0.86 |
G |
69.9 |
NC50-G
(4IF-G) |
0.87 |
139.7
|
E |
177.8 |
170.7 |
95.3 |
5¹/2FH-E |
1.53 |
X |
5¹/2FH-X |
1.21 |
G |
5¹/2FH-G |
1.09 |
S |
184.2 |
88.9 |
5¹/2FH-S |
0.98 |
E |
177.8 |
5¹/2FH-E |
1.21 |
X |
5¹/2FH-X |
0.95 |
G |
184.2 |
5¹/2FH-G |
0.99 |
S |
82.6 |
5¹/2FH-S |
0.83 |
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