Downhole pressure attenuation apparatus
This patent describes a process for preventing damage to tool strings and other downhole equipment in a well caused by pressures produced during detonation of one or more downhole explosive devices. It comprises adding to a tool string at least one pressure attenuating apparatus for attenuating the peak pressure wave and quasi-static pressure pulse produced by the explosive devices, the pressure attenuating apparatus including an initially closed relief vent including tubing means supporting a plurality of charge port assemblies each including an explosive filled shaped charge and a prestressed disc, the shaped charges interconnected by a detonating cord, the amount of explosive in each shaped charge being sufficient to rupture its associated disc without damaging surrounding tubular bodies in the well, and a vent chamber defined by the tubing means and providing a liquid free volume, and opening the relief vent substantially contemporaneously with downhole explosive device detonation by detonating the shaped charges to rupture the discs of the charge port assemblies.
- Assignee:
- Dresser Industries, Inc., Dallas, TX (United States)
- Patent Number(s):
- US 5088557; A
- Application Number:
- PPN: US 7-494096
- OSTI ID:
- 5356969
- Resource Relation:
- Patent File Date: 15 Mar 1990
- Country of Publication:
- United States
- Language:
- English
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