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Innovative Drilling and Completion Technologies for Economic Development of Offshore Unconventional Heavy Oil Thermal Recovery

Day 2 Tue, May 07, 2024(2024)

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Abstract
Abstract Bohai Oilfield is rich in unconventional heavy oil reserves where the viscosity of formation crude oil is more than 50000 cP and mobility are poor. To produce heavy oil from formation to the surface and transport it to processing terminal is recognized as a worldwide challenge, especially for offshore oilfield for development cost. Taking the development idea of "Overall deployment, Step-by-step implementation, and Test first" for technical research, the pilot test of thermal recovery was successfully carried out in Bohai Oil fields for the first time. Facing well head elevation and annulus pressure build up problems caused by high injection temperature (350°C), the low-density cementing slurry system is developed to ensure the cementing quality; Casing material and sand control method are optimized and selected to ensure wellbore integrity and sand control effectiveness, and other down hole safety control tools have also been optimized for high pressure and temperature. The results show that after 28 days of bath at 350°C, the uni-axial compressive strength of the newly developed cement stone can basically be stabilized, which indicates that the cement stone has good high-temperature stability and well head evaluation problems have been mitigated. The proposed injection-production jet pump integration process is that the heat injection process and the production process use one set of production strings to realize the efficient connection between heat injection and production, and the operating cost is reduced. The long-term sand control technology for thermal recovery wells has been proposed, and 8 rounds of field tests have been completed with the sand content of the produced fluid is less than 0.3‰; The high-temperature down hole safety control system including high-temperature down hole safety valve, high-temperature thermal production packer and other key tools have been developed to build a safety barrier. These technologies have been successfully applied in Bohai Oilfield, helping Bohai Oilfield achieve a breakthrough in the large-scale and economic development of ultra-heavy oil.
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