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rubm1998

Cable tool drilling jars with serial number: Why they are essential for drilling operations



This paper discusses a new, innovative tool, namely a hydraulic jar with a mechanical lock developed to run on wireline cable. The discussion addresses (1) the role and value of wireline jars in electric line operations, (2) technical features of the new wireline jar system with comments on its operation, and (3) a brief review of several of the many successful field applications.


A multi-conductor jar, called the LockJar, has been in use for more than four years. The jarring system utilizes a proprietary-design LockJar and Enhancer, both of which remain passive until such time as they are needed. The LockJar can be pulled, without triggering, as hard as desired for durations shorter than the tool's time delay. Slacking off the string resets the LockJar so that it can be pulled again. Experience with this new technology has also led to discovery of valuable best practices for handling stuck tools, which has increased the number of freed tool strings. Among these best practices is the use of properly placed standoffs, particularly in inclined sections of wellbores.




cable tool drilling jars with serial number


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