While jar technology has been used in the oil industry for the better part of the last century, the basic function and capability has not taken many leaps forward. Increasingly complex well geometry and deeper target depths continue to push drillers into tighter, higher risk well conditions that raise the probability of stuck pipe events. As demand for hydrocarbons has forced our drilling capabilities to evolve, the increased risk associated with these wells has forced the evolution of jarring technology to drastically evolve. By assessing the critical needs of the industry, a jar has been designed to operate in the harshest environments, with superior reliability, and the highest firing loads available to increase the levels of success in freeing a drill string during a stuck pipe event. Every pound of impact force delivered is critical to improve the chances of retrieving the drill string safely to surface and this new technology has raised the standard force by as much as 20%. While the operation of this innovative technology remains consistent with industry standards, the performance in regards to torsional strength, damage resistance, and impact capabilities far exceed that of previously existing jar technology. An optional performance component offers operators a safeguard against pulling the jar beyond its mechanical and hydraulic limits which can render it useless down hole. In addition to safeguarding the tool from damage, this module also allows the tool to be pulled to its maximum rating, every time, insuring the hardest possible impact every pull. This paper will detail how the use of this innovative tool has provided flawless performance in the North Sea and offers a true step change in jar technology to the drilling industry. Case studies and field data provided will support and demonstrate increased performance unmatched in the industry today.

With the discovery of shale plays around the world, there has been an increase in the prevalence of highly deviated wells and extended reach drilling. Both highly deviated wells and extended reach drilling present drilling challenges; modeling is required at various stages of the well and several considerations must be taken into account. In addition, detailed torque and drag analysis along with a comprehensive analysis of hydraulics programs must be performed to ensure the down hole equipment used for the application meets the challenging requirements. One of the most important considerations that should be taken into account is jar placement. The intricacies of jar placement are typically misunderstood and often over-looked. Good, sound technical recommendations on jar placement are generally hard to come by. Yet, legitimate technical advice on jar placement can ultimately ensure the use of optimal operational guidelines when drilling in highly deviated wells and using extended reach drilling. In these instances, conventional jar placement knowledge does not always apply. Highly deviated wells and extended reach drilling present unique drilling challenges such as the possibility of getting stuck in two different sections of the well bore. Computer modeling is currently used to predict any down hole loads that would hinder the operation of a drilling jar used in such an instance. This paper provides an analysis of jar placement in highly deviated wells and promotes the use of two drilling jars in the drill string. In addition, consideration is given to jar placement calculations which are further discussed in order to provide optimal impact and impulse result recommendations. A set of operational guidelines also has been included, ensuring that optimal results are obtained when using two jars in the drill string.