Collapse initiated explosive pellet
AssigneeSchlumberger Technology Corporation
InventorsTimothy A. Andrzejak, Jorge E. Lopez de Cardenas, Robinson Egydio Lopes
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Abstract
A technique facilitates analysis of hydraulic fractures. A plurality of explosive pellets is constructed for delivery into fracture or fractures of a subterranean formation. Each explosive pellet comprises an explosive material combined with an initiating member working in cooperation with a friction sensitive pyrotechnic mixture. Crushing or otherwise actuating the initiating member initiates the friction sensitive pyrotechnic mixture which, in turn, ignites the explosive material to produce explosive signals. The explosive signals may be monitored to obtain data related to the fracture or fractures.
Claims17
A system for analyzing hydraulic fractures, comprising:
- an explosive pellet having:
- a casing;
- a primary explosive material disposed within the casing;
- a secondary explosive material disposed within the casing adjacent to the primary explosive material;
- an initiating member;
- wherein the initiating member comprising a set of concentric rings;
- and
- a friction sensitive pyrotechnic mixture disposed inside the initiating member, the friction sensitive pyrotechnic mixture being positioned adjacent the primary explosive material.
A method to facilitate analysis of hydraulic fractures, comprising:
- forming a plurality of explosive pellets with each explosive pellet having an explosive material within a casing and an initiating member comprising a friction sensitive pyrotechnic mixture within a plurality of fracturable rings;
- delivering the plurality of explosive pellets into at least one fracture extending into a subterranean formation;
- and
- monitoring the explosive signals provided upon detonation of the explosive material via crushing of explosive pellets of the plurality of explosive pellets.
A system, comprising:
- a liquid;
- and
- a plurality of explosive pellets disposed in the liquid, each explosive pellet having an explosive material and initiating member to ignite the explosive material upon fracture of at least a portion of the initiating member, wherein the initiating member comprises a plurality of fracturable rings.
Dependencies are inferred from the claim text.