초록 ▼

An apparatus and method for retaining shaped charges. A foam core having charge carrying recesses can be constructed from a single piece or from multiple sections. Shaped charges are insertable within the foam core recesses so that the shaped charges are proximate to a detonator cord positioned insi

An apparatus and method for retaining shaped charges. A foam core having charge carrying recesses can be constructed from a single piece or from multiple sections. Shaped charges are insertable within the foam core recesses so that the shaped charges are proximate to a detonator cord positioned inside or outside of the foam core. The foam core assembly holding the detonator cord and shaped charges is inserted into a housing such as a cylindrical tubing to construct the perforating gun. A seal isolates the shaped charges from pressurized well fluids. The housing can be attached to a firing head and lowered to the desired depth in a well casing. Additional foam sections can be added to modify the number and orientation of the shaped charges. The invention is particulaly useful with thin housing material and substantially reduces the manufacturing cost of perforating guns.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for retaining a shaped charge, ignitable by a detonator cord, within a housing which can be lowered into a well, comprising:a foam core insertable within the housing;a recess within said foam core for retaining the shaped charge in a selected position within

[ What is claimed is:] [1.] An apparatus for retaining a shaped charge, ignitable by a detonator cord, within a housing which can be lowered into a well, comprising:a foam core insertable within the housing;a recess within said foam core for retaining the shaped charge in a selected position within the housing; anda hole in said foam core for permitting engagement between the detonator cord and the shaped charge.