Well Intervention Outside of Short String Experiences in Java Sea - Indonesia

Abstract Performing coiled tubing and wireline well interventions outside of the short string in dual completions has become an acceptable part of well intervention activities in the Offshore West Java field over the last 2 years. Previously, most well intervention activities below the end of the short string tubing were avoided due to the perceived high risk of problems such as getting stuck by wrapping tools around the long string or wedged between the long string and the casing wall. West Java is a mature field with almost all the wells penetrating multi-layer reservoirs. Reservoir management issues have resulted in a large number of dual completions. In order for wells to maintain production at their potential rates and for the shut-in wells to be reactivated, well intervention activities need to be performed regularly in both strings. To date, 14 coiled tubing interventions outside of short string have been completed. Coiled tubing intervention consists of 8 fill clean outs, 2 cementing jobs, 1 fishing job, 1 polymer water shut-off and 2 stimulation jobs. Perforation jobs were done after performing coiled tubing cementing and water shut off jobs. All these jobs have been done with a high degree of success under a varity of well conditions (high angle, etc). This paper will explain several problems that were encountered while working outside of short string, especially during coiled tubing interventions. Several ideas have been applied and lessons learned to overcome these problems. If we look back at the results in the Offshore West Java field over the last two years, working outside of short string has become a common practice in sustaining or even increasing production and in re-activating shut in wells.