Wire Bristle Scratcher (S 70) |
Consists of a hinged collar radiating into bristles. Each bristle is made of hardened & tempered wire with two scratching elements. Available in the size range 4½" to 20" these scratchers improve the cement bond between the casing and porous formations while reinforcing the cement column. |
Wire Bristle Scratcher (S 70) |
Size |
Bristle O.D. |
Compressed O.D. |
in. |
mm. |
in. |
mm. |
4 ½ |
11 ¼ |
286 |
6 |
152 |
5 |
11 ¾ |
298 |
6 ⅜ |
162 |
5 ½ |
12 ¼ |
311 |
7 |
178 |
6 ⅝ |
13 ¼ |
337 |
8 |
203 |
7 |
13 ⅝ |
346 |
8 ⅜ |
213 |
7 ⅝ |
14 ⅛ |
359 |
9 |
229 |
8 ⅝ |
15 |
381 |
10 |
254 |
9 ⅝ |
18 ¼ |
464 |
11 |
279 |
10 ¾ |
19 |
483 |
12 ⅛ |
308 |
11¾ |
19 ⅝ |
498 |
13 ⅛ |
334 |
13 ⅜ |
20 ¾ |
527 |
14 ¾ |
375 |
16 |
24 |
610 |
18 ⅜ |
467 |
18 ⅝ |
26 |
660 |
20 ¾ |
527 |
20 |
26 ¾ |
679 |
21 ¾ |
552 |
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