An extensive study of the weather conditions affecting the performance of a tightly controlled set of perforating charges has shown that a large amount of the variance of performance of charges is caused by the storage conditions of both the charges and the detonating cord. The tests were run on a single lot of commercially available perforating charges that were made under extremely rigid quality control methods especially for the test. After initial testing of 15 of the charges to establish a level of variance, the charges were separated into lots and stored at conditions simulating desert, sea coast, mountains, and arctic environments. Charges were stored in both unsealed and moisture resistant, packaging. Charges were removed and fired at regular intervals to establish performance.

Sections of detonating cord were also stored at the weather conditions in unsealed and moisture resistant packaging. The detonating cord was tested after one year in storage. X-ray inspection was evaluated to determine if it could be used to Bpot potential problems in perforator performance.

Long-term exposure to humidity and high temperature storage were proven to be detrimental to charge performance. Cyclic temperature storage was a factor in the degradation of detonating cord.

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