Abstract

In the present paper, numerous stuck pipe events were carefully studied in wells drilled in the Kingdom of Saudi Arabia between 2013 and 2014. Stuck pipe events were analyzed per different hole sections (from 34 in. to 5 7/8 in.) and it was noted that overall the number of stuck pipe events were less for the top hole sections. Therefore, the focus of the study was to evaluate the utilization and effectiveness of Drilling Jars in the top hole sections 34″, 28″ and 22″ during stuck pipe events.

The data was collected from Saudi Aramco Stuck Pipe database and limited to new wells, a total of 42 fields and 1026 wells were reviewed. After that, each stuck pipe event was classified according to field name and to the respective hole size where the incidents occurred. A detailed and comprehensive study was conducted for each stuck pipe incident independently, reviewed daily drilling reports and determined the utilization of the Drilling Jars as well as the effectiveness to free the drill string during the stuck pipe incidents.

Classifying the stuck pipe events and analyzing the results, showed that the effectiveness of Drilling Jars in the top hole sections was uncertain. For the 34″ and 28″ hole sections, the effectiveness of Drilling Jars was minimal. For the 22″ hole sections, it showed higher number of utilization and effectiveness. The study concluded that the use of Drilling Jars in the 34″ and 28″ hole sections were ineffective, therefore it was recommended to eliminate the use of Drilling Jars for the respective hole sections across drilling operations in KSA. This decision will result in significant savings, and help to free up service provider resources for use in other hole sizes.

The research became a useful reference in defining the utilization and effectiveness of Drilling Jars across Saudi Aramco Operations. Drilling Engineers are encouraged to optimize the use of drilling equipment in the bottom-hole assembly, to improve efficiency and reduce drilling costs.

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