E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/117 (2006.01) F24B 1/00 (2006.01)
Patent
CA 2541923
A non-linear shaped charge perforator (10) for use in perforating an oil and gas formation into which a wellbore has been drilled comprises a monolithic, axisymmetric metal case (12) in which is disposed a main explosive charge between the front of the case, which is closed with a concave metal liner (24), and the closed back end (14) of the case. The main explosive charge contains multiple initiation points (30), preferably two initiation points located about 180~ apart on the outside surface of the charge, so that when the perforator is detonated the main charge is initiated such that the metal liner is collapsed into a non-circular jet, preferably a fan-shaped jet, that pierces the casing of the wellbore and forms non-circular perforations, preferably slot-shaped perforations, in the surrounding formation.
L'invention porte sur un perforateur de charge de forme non linéaire (10) destiné à être utilisé pour perforer une formation pétrolifère et gazéifère dans laquelle on a percé un puits de forage. Ce perforateur comprend un boîtier métallique monolithique, axisymétrique (12) dans lequel est placée une charge principale explosive entre l'avant du boîtier qui est fermé par un revêtement métallique concave (24), et l'extrémité arrière fermée (14) du boîtier. La charge explosive principale contient plusieurs points de déclenchement (30), de préférence deux points de déclenchement situés à 180· à l'écart de la surface extérieure de la charge de sorte que, lorsque le perforateur a détoné, la charge principale soit déclenchée de sorte que le revêtement linéaire se plie sous forme d'un jet non circulaire, de préférence un jet en forme de ventilateur, qui perce le cuvelage du puits de forage et forme des perforations non circulaires, de préférence des perforations en forme de fentes, dans la formation souterraine.
Baker Ernest L.
Burba John L. III
Daniel David C.
Daniels Arthur S.
Davis Robert E.
Marks & Clerk
Molycorp Inc.
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