Shaped-charge liner with precursor liner

Details Shaped-charge liner with precursor liner Shaped-charge liner with precursor liner

E - Fixed Constructions

21

B

E21B 43/117 (2006.01) F42B 1/028 (2006.01)

Patent

CA 2421671

The present disclosure suggests a method to remove well bore fluid from the path of a shaped-charge jet in order to reduce the effect it has on the jet tip. This most preferred embodiment uses a precursor liner and a primary liner both pressed in the same housing. In the most preferred embodiment, the primary liner is similar or equivalent to a standard big hole shaped charge liner. The precursor liner is pressed into the apex end of the primary liner and upon detonation is intended to form an initial very fast moving precursor jet to open a path through the fluid of the well bore annulus for the following primary jet. In the preferred embodiment the precursor liner is made from different material, preferably a less dense material and/or a material having a higher sound speed, than the material forming the primary liner.

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