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General
The centralizes are designed and
manufactured in accordance with API
spec.10D.
The welded construction provide for
superior strength with destructive
tensional force up to 7 times higher
than non-weld centralizer. The
centralizer are suitable to the sucker
rod, tubing,
the surface casing and the technical
casing in well. They include 4 sorts of
form which are the
Insert, half-loop, hinge and spiral
flow.
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Non-Welded Bow
Type Centralizer
Standard Bow centralizer is nasr
mobtakeran long standing conventional
Line of non-weld centralizers. The
non-weld construction Provide for
Superior strength with destructive
tensional force up to 4 timers higher
Than non-weld centralizer products
designed to be installed over
Stop collar or casing coupling the type.
Is available in a wide range
Of casing and hole size, the type ….is
also made in grave pack and
Drill pipe centralizer styles. |
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“NM 10” Type
Centralizer Dimension and Performance
Data
|
Size |
Bow
Type |
Maximum OD |
Minimum Compressed Od |
Size |
Bow
Type |
Maximum OD |
Minimum Compressed Od |
|
4
1/2 |
NM1
NM2
NM3
NM4 |
7 1/4
7 5/8
9 3/8
10 5/8 |
184
193
238
270 |
5 1/2
5 3/4
5 3/4
5 3/4 |
140
146
146
146 |
9 5/8 |
NM1
NM2
NM3
NM4 |
12 1/2
12 3/4
14 1/2
15 3/4 |
318
324
365
400 |
10 3/4
10 7/8
10 7/8
10 7/8 |
273
276
276
276 |
|
5 |
NM1
NM2
NM3
NM4 |
7 3/4
8 1/8
9 7/8
11 1/8 |
197
206
251
283 |
6
6 1/4
6 1/4
6 1/4 |
152
159
159
159 |
10 3/4 |
NM1
NM2
NM3
NM4 |
13 5/8
13 7/8
15 5/8
16 7/8 |
346
353
397
429 |
11 7/8
12
12
12 |
302
305
305
305 |
|
5
1/2 |
NM1
NM2
NM3
NM4 |
8 1/4
9 5/8
10 3/8
11 5/8 |
210
219
264
295 |
6 1/2
6 3/4
6 3/4
6 3/4 |
165
171
171
171 |
11 3/4 |
NM1
NM2
NM3
NM4 |
14 5/8
14 7/8
16 5/8
18 |
372
378
422
457 |
12 7/8
13
13
13 |
327
330
330
330 |
|
6
5/8 |
NM1
NM2
NM3
NM4 |
9 3/8
9 3/4
11 1/2
12 3/4 |
238
248
292
324 |
7 5/8
7 7/8
7 7/8
7 7/8 |
194
200
200
200 |
13 3/8 |
NM1
NM2
NM3
NM4 |
16 1/4
16 1/2
18 3/8
19 5/8 |
413
419
467
499 |
14 1/2
14 5/8
14 5/8
14 5/8 |
368
372
372
372 |
|
7 |
NM1
NM2
NM3
NM4 |
9 3/4
10 1/8
11 7/8
13 1/8 |
248
257
302
333 |
8
8 1/4
8 1/4
8 1/4 |
203
210
210
210 |
16 |
NM1
NM2
NM3
NM4 |
18 7/8
19 1/4
21
22 1/4 |
479
489
533
565 |
17 1/8
17 1/4
17 1/4
17 1/4 |
435
438
438
438 |
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7
5/8 |
NM1
NM2
NM3
NM4 |
10 3/8
10 3/4
12 1/2
13 3/4 |
264
273
318
249 |
8 3/4
8 7/8
8 7/8
8 7/8 |
222
226
226
226 |
16 5/8 |
NM1
NM2
NM3
NM4 |
21 1/2
21 7/8
21 5/8
24 7/8 |
546
556
600
632 |
19 7/8
20
20
20 |
505
508
508
508 |
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8
5/8 |
NM1
NM2
NM3
NM4 |
11 3/8
11 3/4
13 1/2
14 3/4 |
269
295
346
375 |
9 3/4
9 7/8
9 7/8
9 7/8 |
248
251
251
251 |
20 |
NM1
NM2
NM3
NM4 |
22 7/8
23 1/4
25
25 1/4 |
581
591
635
667 |
21 1/4
21 3/8
21 3/8
21 3/8 |
540
543
543
543 |
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Non-Weld Spiral
Centralizer
Nasr Mobtakeran non-weld spiral
centralizer incorporate
All the advantage of the non-weld
straight centralizer plug
several special features:
• The helical bow form helps bridge
keyseats and other
hole irregularities for optimum
centering of the casing.
• The spiral bows create a self-cleaning
action
• While ruing in the hole, the
centralizer removes excessive
Wall cake
• The swirling action created by the
spiral bows improves
Cement distribution.
Nasr mobtakeran recommends the
installation of alternating right and
left-hand spiral centralizer to
eliminate the tendency of the casing to
rotate while running when ordering,
please specify right or left-hand
spiral. |
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“NM” Type
Spiral Centralizer Dimension and
Performance Data
|
Size(Inch) |
BOW TYPE |
Maximum
Bow OD |
Minimum
Compressed Bow OD (in.
mm) |
|
4 1/2 |
SPO |
6 7/8
175 |
5 1/2
140 |
|
5 |
SPO |
7 3/8
187
|
6
152 |
|
7 |
SP1
SP11 |
9 3/8
238
12 1/8 308 |
8
203
8 1/4
210 |
|
8 -5/8 |
SP1
SP11 |
11
280
13 3/4
349 |
9-3/4
248
9-7/8
251 |
|
9-5/8 |
SP1
SP11 |
12
305
14 3/4
375 |
10 3/4
273
10 7/8
276 |
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Non-Weld
Positive Centralizer
Nasr mobtakeran non-weld
positive centralizers are available for
both tubing and casing applications.
They significantly reduce frictional
drag when used in deviated holes, and
can provide nearly 100 percent standoff
(concentricity) when run inside a cased
hole.
Concentric casing strings facilitate
liner and packer positioning, stage
cementing, surface cementing, slip and
packoff installation, and well-
abandonment. Nasr mobtakeran non- weld
positive centralizers offer the
following features: |
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“NM” Type Positive
Dimension and Performance Data
|
Bow Type/Maximium OD (in.mm) |
|
Size(in) |
PO 1 |
PO 2 |
PO 3 |
PO 4 |
PO 5 |
PO 6 |
PO 7 |
PO 8 |
PO 9 |
PO 10 |
PO 11 |
|
4
4 1/2 |
5 1/8 130
5 5/8 143 |
5 1/2 140
6 152 |
5 7/8 149
5 3/8 162 |
6 1/8 156
5 5/8 168 |
6 1/2 165
7 178 |
6 7/8 175
7 3/4 187 |
7 1/4 184
7 3/4 197 |
7 5/8 194
8 1/8 206 |
8 7/8 225
9 3/8 238 |
10 3/8 264
10 7/8 246 |
5 7/8 149
6 3/8 162 |
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5
5 1/2 |
6 1/8 156
6 5/8 168 |
6 1/2 165
7 178 |
6 1/8 175
7 3/8 187 |
7 1/8 181
7 5/8 194 |
7 1/2 191
8 203 |
7 7/8 200
8 3/4 213 |
8 1/4 210
8 3/4 222 |
5 5/8 219
9 1/8 232 |
9 7/8 251
10 3/8 264 |
11 3/8 289
11 7/8 302 |
6 7/8 175
7 3/8 187 |
|
6 5/8
7 |
7 3/4 197
8 1/8 206 |
8 1/8 206
8 1/2 216 |
8 1/2 216
8 7/8 225 |
8 3/4 222
9 1/8 232 |
9 1/8 232
9 1/2 241 |
9 1/2 241
9 7/8 251 |
9 7/8 251
10 1/4 260 |
10 1/4 260
10 5/8 270 |
11 1/2 292
11 2/8 302 |
13 330
13 3/8 340 |
8 1/2 216
8 1/8 225 |
|
7 5/8
8 5/8 |
8 3/4 222
9 3/4 248 |
9 1/8 232
10 1/8 257 |
9 1/2 241
10 1/2 267 |
9 3/4 248
10 3/4 273 |
10 1/8 257
11 1/8 283 |
10 10/2 267
11 1/2 292 |
10 7/8 276
11 7/8 302 |
11 1/4 286
12 1/4 311 |
12 1/2 318
13 1/2 343 |
14 356
15 381 |
9 1/2 241
10 1/2 267 |
|
9 5/8
10 3/4 |
10 3/4 273
11 3/4 298 |
11 1/8 283
12 1/8 308 |
11 1/2 292
12 1/2 318 |
11 3/4 298
12 3/4 324 |
12 1/8 308
13 1/8 333 |
12 1/2 318
13 5/8 346 |
12 7/8 327
14 356 |
13 1/4 337
14 3/4 365 |
14 1/2 368
15 1/2 394 |
16 406
17 1/8 435 |
11 1/2 292
12 1/2 318 |
|
11 3/4
13 3/8 |
12 3/4 324
14 3/4 365 |
13 1/8 333
14 3/4 375 |
13 1/2 343
15 1/8 384 |
13 3/4 349
15 3/8 391 |
14 1/8 359
15 3/4 400 |
14 5/8 371
16 1/4 413 |
15 381
16 5/8 422 |
15 2/8 391
17 432 |
16 1/2 419
18 1/8 460 |
18 1/8 460
19 3/4 502 |
13 1/2 343
15 1/8 384 |
|
16
18 5/8 |
17 432
19 5/8 498 |
17 3/4 441
20 508 |
17 3/4 451
20 3/8 518 |
18 457
20 5/8 524 |
18 3/8 467
21 533 |
18 7/8 479
21 1/2 546 |
19 1/4 489
21 7/8 556 |
19 5/8 498
22 1/4 565 |
20 3/4 527
23 3/8 594 |
22 3/8 568
25 635 |
17 3/4 451
20 3/4 518 |
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20 |
21 533 |
21 3/8 543 |
21 3/4 552 |
22 559 |
22 3/8 568 |
22 7/8 581 |
23 1/4 591 |
23 5/8 600 |
24 3/4 629 |
26 3/8 670 |
21 3/4 552 |
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Special
application centralizer;
For application such as gravel packing
or cementing
In under-reamed wellbore, washed out
areas, and storage
Wells, the ballon-type centralizer is
recommended because
Of its increased bow diameter easily
assemble in standard
Non-weld collars, the bows have a
reduced starting force
To allow passage through previously set
pipe, but will expand
To centralizer in abnormal open hole
conditions. They are available
Only in straight bow type |
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“NM” Type Ballon
Dimension and Performance Data
|
Size(in) |
Bow type |
Maximum
Bow OD (in. mm) |
|
4 – 1/2 |
ST V
ST V11 |
16
-3/4
426
28-1/8
715 |
|
5 |
ST V
ST V11 |
17
-1/4
438
28-5/8
727 |
|
7 |
ST V
ST V11 |
19-3/8
492
30-5/8
778 |
|
9-5/8 |
ST V
ST V11 |
22
559
33-1/4
845 |
|
10 3/4 |
ST V
ST V11 |
23-1/8
588
34-1/2
876 |
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13 -3/8 |
ST V
ST V11 |
25-3/4
654
37-1/8
943 |
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18-5/8 |
ST V
ST V11 |
31-1/8
791
42-3/8
1076 |
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20 |
ST V
ST V11 |
32-1/2
826
43-7/8
1115 |
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Hinged Spiral Nail
Stop Collar.
Available in the size range 3½" to 20",
this device can be
Used in both upset and non-upset casing
to provide
Maximum clearance during rotation. It
has a groove in the
Middle into which a spiral nail can be
driven for improved
Grip on the casing. The broader band
firmly grips the collar
Into position around the casing. |
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“NM” Type Stop
collar Dimension and Performance Data
|
Size(in.) |
Maximum OD |
|
3-1/2 |
4-1/8 |
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4-1/2
|
5-7/8
143
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5 |
6-1/8
156 |
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7
|
8-1/4
209
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5-5/8
|
9-7/8
251 |
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9-5/8 |
10
7/8
276 |
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10-3/4
|
12
305
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13-3/8 |
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