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LockJar®
In a typical open hole logging string, the multi-conductor jar is placed immediately above the logging or formation testing tools, where it is mated with an enhancer to augment the force used when the weight is thrown up hole after the jar is activated. The multi-conductor LockJar assembly from the top down consists of a cable head, the enhancer, cable mode and telemetry subassemblies, and lastly the jar, creating as large a mass as possible to help the jar loosen stuck logging tools. Both the enhancer and jar store energy in Belleville springs, which propel a hammer into an anvil upon activation to generate the impact and impulse. It has been demonstrated in the lab that the multi-conductor LockJar's impulse is more than twice as powerful with up to five times more duration when the enhancer is added to the jar. Unlike the previous mechanical jars, learning to use the multi-conductor LockJar is quick and easy. Logging crews can be trained to use the tool in minutes, so a jar service technician is not required on location. The jar and enhancer arrive at the well site ready to run, and the lock setting can be adjusted at the well site to accomodate tool string weights from 1,700 lbs. to 4,000 lbs. Both the Multi-Conductor Electric Wireline Jar and the Enhancer are designed for maximum flexibility when it comes to tool string compatibility. Each service company has unique wiring and connectivity specifications that must be met in order for logging data to pass through the tool properly. Evans Engineering provides tool configurations that meet the specifications for Baker Atlas, Schlumberger and Halliburton, allowing a seamless integration of our Jar and Enhancer into your tool string. |
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