초록 ▼

A through-tubing perforating apparatus for use in improving wellbore production. A plurality of shaped charges are interconnected by rigid links that each have eyelets to receive the suspension wire. These links, in conjunction with a guide which initially engages and slides along the suspension wir

A through-tubing perforating apparatus for use in improving wellbore production. A plurality of shaped charges are interconnected by rigid links that each have eyelets to receive the suspension wire. These links, in conjunction with a guide which initially engages and slides along the suspension wire, keep the shaped charges in a substantially uniform orientation generally perpendicular to the sides of the wellbore. Once the apparatus emerges from the production tubing, a releasable latch interconnecting an upper terminal connector to the supporting wire is actuated permitting the charges, under the influence of the rigid links, to slump under their own weight into contact with the casing walls. This provides maximum penetration into the formation upon actuation of the charges. The expended apparatus can be dropped into the bottom of the wellbore with the aid of a sinker bar.

대표청구항 ▼

Apparatus for perforating a wall of a cylindrical wellbore of a given diameter after having passed through a tubing of a smaller diameter, said apparatus comprising: (a) a plurality of shaped charges including an uppermost shaped charge and a lowermost shaped charge, each said shaped charge having a

Apparatus for perforating a wall of a cylindrical wellbore of a given diameter after having passed through a tubing of a smaller diameter, said apparatus comprising: (a) a plurality of shaped charges including an uppermost shaped charge and a lowermost shaped charge, each said shaped charge having a pair of diametrically opposed connecting means extending laterally therefrom, a line interconnecting said diametrically opposed connecting means defining a first length of said shaped charge which comprises the shortest distance between said line and a first outermost longitudinal point on said shaped charge and a second length of said shaped charge which is defined as the shortest distance from said line to a second innermost longitudinal point on said shaped charge; (b) suspension wire means extending from a point above said uppermost shaped charge to a point beneath said lowermost shaped charge; (c) separate individual linkage means extending between and pivotally attached to one of said connecting means of each of a pair of adjacent shaped charges, each said individual linkage means being substantially rigid and of a third length, the sum of twice said first length plus said third length being greater than said given wellbore diameter; (d) termination connector means connecting said uppermost and said lowermost shaped charges to said suspension wire means at first and second termination connection points, the locations of said first and second termination connection points defining a first vertically extending length of said plurality of shaped charges, said uppermost termination connector means being capable of relative sliding motion with respect to said suspension wire means; whereby, when said apparatus has passed through said smaller diametered tubing, said uppermost termination connector means can be allowed to slip down said suspension wire means to define a second lesser vertically extending length of said shaped charges and allowing said shaped charges to slump outwardly into contact with the wall of said wellbore by virtue of their own weight, said individual linkage means holding said shaped charges in direct contact with the wall of said wellbore.