Well Leak and Annular Flow Analysis for a Gas-Well, A Workover Operation in South of Iran

The workover jobs may conduct in a well during or after of completion operation for various reasons. One of the most common problems in the south of Iran is gas leakage and annular pressure increasing in the well. In this paper, the annular flow condition and energy and casing/liner leakage have been investigated by different new technologies such as Well Leak Detector (WLD), Well Annular Flow (WAF) and Ultrasonic Image Tool (USIT) in a well in one of the Iranian southern gas fields. The WLD logs showed no turbulent flow behind of casing. On the other hand, the USIT tests illustrated that laminar flow is not the result of large holes’ existence on the body of completion strings. Two different methods were conducted for better analyzing the WAF tests: Shut-in pass and Bleeding-off pass. All of the WAF sensors have been displayed the same trend for both scenarios in different time periods. The results have demonstrated the precise location of a shale layer and a gas pocket and determined that the leakage is via the liner-casing joint. Finally, casing/liner punching, squeeze cementing and tying back the liner was suggested and applied in the well as an optimum workover operation.