System for producing high density, extra large well...

E - Fixed Constructions – 21 – B

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Details

E21B 43/11 (2006.01) E21B 43/117 (2006.01)

Patent

CA 2246363

A shaped charge (27) and liner (33) having a minimum outside diameter determined by the formula: DL = 2.625 - 0.3571 (6-DID), where DL = Liner Minimum Outside Diameter, DID = Carrier Inside Diameter. The geometry of the shaped charge (27) reduces the chances of interference between charges by controlling burn time, as does the positioning of the primer cord. The liner (33) has an open end with a minimum outside diameter determined by the formula. The shape of the case (29) and liner (33) is determined by keeping the center of the primer cord (49) a distance not greater than 0.10 (DID) from the center line of the carrier (13), ideally not greater than 0.05 (DID). This yields a large diameter, flat shaped charge that may be loaded in a tubular carrier having a charge or perforation density of at least 10 shots per foot.

Charge configurée (27) et chemisage (33) présentant un diamètre extérieur minimum déterminé par la formule: DL = 2,625 - 0,3571 (6-DID), dans laquelle DL correspond au diamètre extérieur minimum du chemisage et DID au diamètre intérieur du porteur. La géométrie de la charge configurée (27) réduit les risques d'interférence entre les charges en permettant de maîtriser le temps de combustion, comme le fait le positionnement du cordon amorce. Le chemisage (33) comporte une extrémité ouverte avec un diamètre extérieur minimum déterminé par la formule précitée. La configuration de l'enveloppe (29) et du chemisage (33) de la charge est déterminée en maintenant le centre du cordon amorce (49) à une distance non supérieure à 0,10 (DID) à partir de la ligne centrale du porteur (13), de préférence une distance non supérieure à 0,05 (DID). Ceci permet d'obtenir une charge de forme plane de grand diamètre pouvant être introduite dans un porteur tubulaire offrant une densité de charge ou de perforation d'au moins 10 tirs par pied.

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