Case Studies

  • Broken Brass Rod

    Broken Brass Rod

    Possible Scenario:

    After the BHA has been pumped down and the plug has been set, it is possible to lose communication with the tool string below the BRT. If adjustments are made with no improvement, the BHA should be pulled out of hole to be inspected.

    Analysis:

    After pulling the BHA, and disarming the guns, it should be inspected to find the cause of the issue. The BRT should be checked with the surface verifier. If the BRT passes verification, it should be removed and the tool string should be checked with the verifier. In this case, the BRT would be verified, but nothing past it would be readable until it was removed. Once the BRT is removed, the tool string would become readable. After disassembling and inspecting the BRT, it is found that the brass rod that connects to the charge tube, which allows communication to the guns below the BRT, had been broken into two pieces. Over time, when redressing the BRT, it is possible for the brass rod to develop a weak point from repeated use and over tightening. The force of the setting tool can cause the brass rod to shear, thus causing an open circuit and failure to read the guns below the BRT.

    Resolution:

    After the cause of the error is identified, the entire crew should be made aware of the issue. After each job the brass rod should be replaced. Additionally, all crew members should understand when rebuilding the BRT, the brass rod is not to be over tightened when reassembling.

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