Flow Profiling Analysis of a Refractured Tight Oil Well Using Distributed Temperature Sensing

This study presents an in-depth analysis of a refractured tight oil well, focusing on both the initial and subsequent refracturing operations. After refracturing, daily oil production surged from 0.8 to 15.0 tons. The well sustained natural flow for 100 days before transitioning to pump-assisted production, resulting in an additional cumulative oil production of 1412 tons. Leveraging distributed temperature sensing (DTS), high-resolution temperature monitoring was performed, revealing key insights into the behavior of both newly created and existing fractures. Older perforation stages outperformed newer ones, with average daily oil production of 4.66 m3 for older stages and 3.49 m3 for newer stages under a 2 mm choke size. Moreover, CO2 pre-fracturing significantly enhanced oil production, with the stages receiving CO2 injection achieving a median daily oil output of 4.04 m3, compared to 3.55 m3 for non-CO2 stages. These results demonstrate the effectiveness of integrating advanced monitoring techniques and innovative fracturing methods to optimize refracturing strategies, ultimately enhancing hydrocarbon recovery in tight oil reservoirs.