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D & D Company Patents |
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Assignee: D & D Company
Address: Victoria, TX
No. of patents: 1
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| RE30829 |
Casing perforation method and apparatus |
December 22, 1981 |
| Method and apparatus for effecting perforation of a well casing with a casing gun while maintaining pressure in the well bore at a lower level than the pressure in the surrounding reservoir at the point of perforation. Before production tubing is run into the well, the casing gun is |
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