Impression Block 2
Impression Block 2 :
A block with lead or another relatively soft material on the bottom. The block may be made up on drill pipe, tubing, or wireline at the surface, run into a well, and allowed to rest on a tool or other object that has been lost in the well. On retrieval to the surface, an idea of the size, shape and position of the "fish" is obtained from an examination of the impression left in the lead. This helps in selecting the appropriate fishing tools. (WLOP)
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