Publications

Pertamina Hulu Energi ONWJ is a Production Sharing Contractor with BP Migas which operates the ONWJ block located offshore North West of Java Island, Indonesia. This oil and gas field is a mature field that has been produced since 1970. As more wells are drilled to drain the oil and gas reserves, the deviation of the wellbore has become higher for the later drilled wells to reach attic position and produce un-drained area. Most of the wells are completed with single selective completion which separates oil / gas zones with the production packers and produced thru a sliding side doors (SSD).The highly deviated wells (>_60°) offer new challenges compared to vertical wells. Opening or closing SSD becomes more complicated. Slickline shifting tool is the most common method to manipulate the SSD, however it is limited to +/- 60° well inclinations because beyond that angle, the force generated by the slickline tool string will no longer sufficient to open or close the SSD. Hydraulic shifting tool combined with impact hammer run on coiled tubing is an alternative method to manipulate SSD in highly deviated wells. SSD shifting operation has been done on 6 highly deviated wells to date using this method without any significant problem being observed. Rig time can be saved significantly by running an impact hammer and shifting tool compared with running a shifting tool only. If the SSD cannot open by the shifting tool, the impact hammer can be activated to give additional force to shift the SSD.This paper will detail the planning process, tools selections, operation summary of three wells and evaluation of job success and failures, including simulation of force needed at different deviation angles. In our case, some of wells perform better after performing close/open SSD with water cut decreasing and significant oil gains. In the future, proposed jobs will be performed on horizontal wells.