Study on Start-Up Process of SAGD by Solvent: Experiment Research and Process Design
- Jun Sun (CNOOC EnerTech-Drilling&Production Co.) | Wenchao Zhou (CNOOC EnerTech-Drilling&Production Co.) | Yanping Sun (CNOOC EnerTech-Drilling&Production Co.) | Chengsheng Wang (CNOOC EnerTech-Drilling&Production Co.) | Yunchuan Fu (CNOOC EnerTech-Drilling&Production Co.) | Hui Lin (CNOOC EnerTech-Drilling&Production Co.)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 18-21 March, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 5.3.9 Steam Assisted Gravity Drainage, 5 Reservoir Desciption & Dynamics, 5.4.10 Microbial Methods, 1.6 Drilling Operations, 5.5.2 Core Analysis, 5.4 Improved and Enhanced Recovery, 4.3.4 Scale, 5.4.6 Thermal Methods, 5.5 Reservoir Simulation
- Start-up process, Experiment research, Process design, Solvent assisted
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- 26 since 2007
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Steam-assisted gravity drainage (SAGD) has been used to develop the "super heavy" oil reservoirs in Canada. The viscosity can reach more than 30,000 cp at 50°C. Moreover, owing to their continental deposit origin, the reservoirs have a low porosity and permeability. Because of these challenging, the conventional steam circulation startup process takes 6 to 12 months before the well pair can be switched to production. Solvent has been used to start-up SAGD with success. But now, low price of oil and high cost of solvent make solvent assisted start-up process limited.
This paper applies experimental schemes such as viscosity reduction rate evaluation, core flooding and 3D physical simulation, test solvent performance, optimize process parameters, and design process solutions. Applies numerical simulation to test solvent assisted SAGD start-up effect, and calculate the cost.
This paper researches a unique low-cost solvent compare with xylene, The basic properties and core flood experiment show, the two solvents are similar with viscosity reduction rate, asphalt dissolution rate and injection pressure, the price of solvent is 18% lower. The 3-D model experiment show, the average start-up time is reduced by 15%, steam injection volume is reduced by 21.4%. The numerical simulation results show, Without solvent, it will take 180d for start-up process, with solvent, the time has reduced by 50% and takes 90 days. Cost calculation results show, the cost will reduce 18% by solvent compared to xylene. Moreover, the production rate has been improved in production stage.
This paper applies a 3-D physical model to simulate the solvent assisted SAGD start-up process. Research conclusions show, the start-up mechanism of solvent and the process of temperature change of steam chamber.
|File Size||1 MB||Number of Pages||9|