methods for managing a smallest dynamic unbalance condition resulting from firing a cannon at a borehole location below and for providing a cannon assembly for use during a wellbore cannoning operation; borehole for use during a cannoning operation in a borehole.

摘要

A cannon assembly for use in a wellbore includes a carrier body and a load retainer disposed within the carrier body. one or more directed jet explosive charges are supported by the carrier body and are operably coupled to a detonator to ignite a high explosive material within each of the directed jet explosive charges. at least one solid propellant tablet is also disposed within the carrier body and is operably coupled to the detonator to ignite and burn immediately upon detonation of the directed jet explosive charges. The solid propellant tablet burns or is consumed to effectively mitigate or control the smallest dynamic imbalance created by the free volume within the carrier body. burning of the solid propellant tablet may increase the pressure within the carrier body to a level lower than hydrostatic pressure around the carrier body in the wellbore, so that a smaller dynamic imbalance is maintained.