Impression block is a common tool for detecting state of fish top in downhole and
shape of casing inner diameter.
Specification of Impression Block
|
Type
|
Connection
|
Waterhole of Impression Block
|
(mm)Length
|
Total Length
|
|
|
OD
|
(in)Connection Type
|
||||
|
270
|
203
|
6 5/8REG
|
40
|
150
|
450
|
|
225
|
165
|
4 1/2IF
|
40
|
130
|
400
|
|
195
|
159
|
4 IF
|
30
|
120
|
350
|
|
170
|
121
|
3 1/2IF
|
30
|
120
|
300
|
|
120
|
108
|
2 7/8IF
|
20
|
100
|
300
|
|
100
|
89
|
2 1/2ZG
|
20
|
100
|
250
|