An Effective Well Development Method for Deep Screen Completed Wells

Abstract

In Lund, Sweden productivity problems were encountered during flow testing of a 1927 m deep gravel packed screen completed well and it became apparent that well development was needed to increase productivity. A hydro-jetting system using coiled tubing in combination with simultaneous pumping was developed and tested and found to be successful. To verify whether the well development improved the well, the results of a pumping test conducted before and after the jetting operation were compared. In addition flowmeter logging during the jetting operation was also used to verify the improvements. Hydro-jetting in combination with simultaneous pumping proved to be an effective cleaning method. After 100 minutes of pumping, there was approximately 110 m less drawdown and 15 l/s higher average flow rate compared to the values before the jetting operation. Influence of wellbore storage was significant during the flow tests carried out before the well development, but was negligible thereafter.