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String adapter
Key words:
String adapter
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String adapter
String adapter is made of AISI4145H Cr-Mo steel in accordance with API Specifications. Same-dimensional adapters, reducing adapters and left-handed rotation adapters can be produced. Threads can be processed with cold rolling, coppering or phosphating.
● Adapter type
|
Sort |
Name |
Top Connectio |
Bottom Connection |
Type |
|
1 |
Kelly saver sub |
Kelly |
Drill pipe |
A or B |
|
2 |
Tool joint |
Drill pipe |
Drill pipe |
A or B |
|
3 |
Crossover sub |
Drill pipe |
Drill collar |
A or B |
|
4 |
Drill collar sub |
Drill collar |
Drill collar |
A or B |
|
5 |
Bit sub |
Drill collar |
Bit |
A or B |
|
6 |
Swivel sub |
Swivel bottom sub |
Kelly |
C |
|
7 |
Junk sub |
Kelly |
Drll pipe |
C |
|
Drill pipe |
Fishing tool |
C |
Note: when the diameter difference of the drill tool connected by adapters is greater than 15 mm (except water adapter and fishing adapter), and the well depth is smaller than or equal to 2000 m, type A or B adapter can be used; when the well depth is greater than 2000 m, type B adapter can be used.
● Mechanical properties of adapter
|
Outer diameter mm(in) |
σb Mpa Tensile strength |
σ0.2 Mpa Yield strength |
84 Elongation |
AKV J Impact |
HB Brinell Hardnes |
|
79.4-175(31/8-67/8) |
≥965 |
≥760 |
≥13 |
≥54 |
≥285 |
|
178-254(7-10) |
≥930 |
≥690 |
≥277 |
Dimensions of adapter for connecting drill pipe
|
Drill pipe |
Outer diameter OD (DL，DM，DU) |
Chamfer diameter Df |
Inner diameter ID |
Drill pipe joint code |
Torsional strength ratio of external thread joint and pipe body |
||||
|
Nominal dimensions |
Steel grade |
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
||
|
60.3 |
E |
85.7 |
±0.8 |
83.0 |
±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(23/81F-G) |
0.79 |
|||||||
|
73.0 |
E |
104.8 |
100.4 |
54.0 |
NC31-E(27/8IF-E) |
1.03 |
|||
|
X |
50.8 |
NC31-X(27/8IF-X) |
0.90 |
||||||
|
G |
NC31-G(27/8IF-G) |
0.82 |
|||||||
|
S |
111.1 |
41.3 |
NC31-S(27/BIF-5) |
0.82 |
|||||
|
88.9 |
E |
120.7 |
116.3 |
68.3 |
NC38-E(31/81F-E) |
0.98 |
|||
|
X |
127.0 |
65.1 |
NC38-X(31/8IF-X) |
0.87 |
|||||
|
G |
61.9 |
NC38-G(31/8IF-G) |
0.86 |
||||||
|
S |
54.0 |
NC3B-S(31/BIF-S) |
0.80 |
||||||
|
E |
65.1 |
NC38-E(31/8IF-E) |
0.97 |
||||||
|
X |
61.9 |
NC38-X(31/81F-X) |
0.83 |
||||||
|
G |
54.0 |
NC38-G(31/8IF-G) |
0.90 |
||||||
|
5135 |
139.7 |
127.4 |
57.2 |
NC40-G(4FH-G) |
0.87 |
||||
|
101.6 |
E |
152.4 |
±0.8 |
145.0 |
±0.4 |
82.6 |
+0.4
-0.8 |
NC46-E(4IF-E) |
1.23 |
|
X |
NC46-X(41F-X) |
0.97 |
|||||||
|
G |
NC46-G(4IF-G) |
0.88 |
|||||||
|
5 |
76.2 |
NC46-S(4IF-S) |
0.81 |
||||||
|
114.3 |
E |
168.3 |
154.0 |
95.3 |
NC50-E(41/2IF-E) |
1.23 |
|||
|
X |
NC50-X(41/2IF-X) |
0.97 |
|||||||
|
G |
NC50-G(41/2IF-G) |
0.88 |
|||||||
|
S |
88.9 |
NC50-S(41/2IF-S) |
0.81 |
||||||
|
E |
92.1 |
NC50-E(41/2IF-E) |
1.02 |
||||||
|
X |
88.9 |
NC50-X(41/2IF-X) |
0.96 |
||||||
|
G |
NC50-G(41/2IF-G) |
0.86 |
|||||||
|
S |
76.2 |
NC50-5(41/2IF-S) |
0.87 |
||||||
|
127.0 |
E |
168.3 |
±0.8 |
154.0 |
±0.4 |
95.3 |
+0.4
-0.8 |
NC50-E(41/2IF-E) |
0.92 |
|
X |
880 |
NC50-X(41/2IF-X) |
086 |
||||||
|
G |
82.6 |
NC50-G(41/2IF-G) |
0.89 |
||||||
|
S |
69.9 |
NC50-5(41/2IF-S) |
0.86 |
||||||
|
E |
88.9 |
NC50-E(41/21F-E) |
0.86 |
||||||
|
X |
76.2 |
NC50-X(41/2IF-X) |
0.86 |
||||||
|
G |
69.9 |
NC50-G(41/2IF-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 |
||||||
Dimensions of adapter for connecting drill collar
|
Outer diameter OD(DL，DM) |
Chamfer diameter DF |
Inner diameter ID |
Drill collar code |
Bending strength ratio |
|||
|
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
||
|
79.4 |
+1.2 0 |
76.2 |
±0.4 |
31.8 |
+1.6 0 |
ZTNC23-31 |
2.57:1 |
|
88.9 |
82.9 |
38.1 |
ZTNC26-35(23/8IF) |
2.42:1 |
|||
|
104.8 |
+1.6 0 |
100.4 |
50.8 |
ZTNC31-41(27/8IF) |
2.43:1 |
||
|
120.7 |
+2.0 0 |
114.7 |
ZTNC35-47 |
2.58:1 |
|||
|
127.0 |
121.0 |
57.2 |
ZTNC38-50(31/21F) |
2.38:1 |
|||
|
152.4 |
+3.2 0 |
144.5 |
ZTNC44-60 |
2.49:1 |
|||
|
71.4 |
|||||||
|
158.8 |
149.2 |
57.2 |
ZTNC44-62 |
2.84:1 |
|||
|
150.0 |
71.4 |
ZTNC46-65(4IF) |
2.91:1 |
||||
|
165.1 |
154.8 |
57.2 |
ZTNC46-65(4IF) |
2.63:1 |
|||
|
71.4 |
|||||||
|
171.4 |
+4.0 0 |
159.5 |
57.2 |
ZTNC46-67(4IF) |
2.76:1 |
||
|
177.3 |
164.7 |
ZTNC50-67(41/2IF) |
3.05:1 |
||||
|
71.4 |
|||||||
|
184.2 |
169.5 |
ZTNC50-72(41/2IF) |
3.18:1 |
||||
|
196.9 |
185.3 |
ZTNC56-77 |
2.70:1 |
||||
|
203.2 |
190.1 |
ZTNC56-80 |
3.02:1 |
||||
|
209.4 |
195.7 |
ZT65/8REG-82 |
2.93:1 |
||||
|
228.6 |
+4.8 0 |
212.7 |
ZTNC61-90 |
3.17:1 |
|||
|
241.3 |
223.8 |
76.2 |
ZT75/8REG-95 |
2.81:1 |
|||
|
247.6 |
+6.4 0 |
232.6 |
ZTNC70-97 |
2.57:1 |
|||
|
254.0 |
237.3 |
ZTNC70-100 |
2.81:1 |
||||
|
279.4 |
266.7 |
ZTNC77-110 |
2.84:1 |
||||
Note: the drill collar code is subject to provisions of SY/T5144.
Dimensions of water adapter for connecting Kelly bar
|
Outer diameter DU |
Chamfer diameter DF |
Thread code |
|||||
|
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
Standard |
Optional |
||
|
Standard |
Optional |
Standard |
Optional |
||||
|
196.8 |
146.0 |
±0.8 |
186.1 |
134.5 |
±0.4 |
6 5/8 REG |
4 1/2 REG |
|
196.8 |
146.0 |
±0.8 |
186.1 |
134.5 |
±0.4 |
6 5/8 REG |
4 1/2 REG |
|
Lower end of Kelly bar |
Inner diameter ID |
Kelly bar type |
Kelly bar specification |
|||||
|
Outer diameter DLR |
Chamfer diameter DF |
Thread code |
||||||
|
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
Basic dimensions |
Extreme deviation |
|||
|
85.7 |
±0.8 |
82.9 |
±0.4 |
NC26(2 3/8IF) |
31.8 |
+1.60 |
Square kelly |
2 1/3 |
|
104.8 |
100.4 |
NC31(2 7/8IF) |
4.4 |
3 |
||||
|
120.6 |
116.3 |
NC38(3 1/2IF) |
57.2 |
3 1/2 |
||||
|
158.8 |
145.3 |
NC46(4IF) |
71.4 |
4 1/2 |
||||
|
161.9 |
150.4 |
Nc50(4 1/2IF) |
||||||
|
177.8 |
170.7 |
5 1/2FH) |
82.6 |
5 1/2 |
||||
|
171.0 |
NC56 |
|||||||
|
85.7 |
±0.8 |
82.9 |
±0.4 |
NC26(2 3/8IF) |
38.1 |
+1.60 |
Hexagonal kelly |
3 |
|
104.8 |
100.4 |
NC31(2 7/8IF) |
44.4 |
3 1/2 |
||||
|
120.6 |
116.3 |
NC38(3 1/2IF) |
57.2 |
4 1/2 |
||||
|
158.8 |
145.3 |
NC46(4IF) |
76.2 |
5 1/2 |
||||
|
161.9 |
150.4 |
NC50(4 1/2IF) |
82.6 |
|||||
|
177.8 |
170.7 |
5 1/2FH) |
88.9 |
6 |
||||
|
171.0 |
NC56 |
|||||||
Chamfer diameter of adapter for connecting drill bit
|
Chamfer diameter DF |
Adapter thread code |
|
|
Basic dimensions |
Extreme deviation |
|
|
77.4 |
±0.4 |
2 3/8REG |
|
91.7 |
2 7/8REG |
|
|
104.4 |
3 1/2REG |
|
|
135.3 |
4 1/2REG |
|
|
165.1 |
5 1/2REG |
|
|
186.9 |
6 5/8REG |
|
|
215.1 |
7 5/8REG |
|
|
242.5 |
8 5/8REG |
|
Surface roughness
|
External thread shoulder side |
Internal thread shoulder side |
Thread working side |
Thread crest side |
|
Ra≤3.2 |
Ra≤3.2 |
Ra≤6.3 |
Ra≤12.5 |
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