Production Features of Flue Gas Assisted SAGD Technology

2012 ◽  
Vol 524-527 ◽  
pp. 1196-1202
Author(s):  
Teng Lu ◽  
Zhao Min Li ◽  
Xiao Na Sun ◽  
Bin Fei Li ◽  
Yong Rong Gao
Keyword(s):  
Heavy Oil ◽  
Flue Gas ◽  
Linear Increase ◽  
Viscosity Reduction ◽  
Steam Chamber ◽  
Heat Efficiency ◽  
Water Breakthrough ◽  
Reduce Heat Loss ◽  
Test Zone ◽  
Cap Rock

The SAGD test zone in the Guantao reservoir of the Du84 Block in the Liaohe Oilfield belongs to a massive reservoir with top water, which may have the challenge of top water breakthrough along with the propagation of steam chamber. Flue gas assisted SAGD technique is proposed to slow down water break through. Laboratory experiments have been conducted to study the dissolubility of flue gas in Liaohe dehydrated super-heavy oil. The result of the experiments indicates that the viscosity of oil/gas mixture reduces drastically, and the rate of viscosity reduction almost shows linear increase after flue gas dissolved in super-heavy oil. The steam chamber extension feature and development characteristics of SAGD and flue gas assisted SAGD were compared by numerical simulation. The results show that flue gas exits in the top of reservoir because of gravitational differentiation, which can inhibit steam overlay, reduce heat loss to cap rock, and increase heat efficiency.

Application of Time Lapse 3D/4D Seismic in the Monitoring of Steam Conformance and Cap Rock Integrity of Heavy Oil Thermal Production Project in North Kuwait

2021 ◽  
Author(s):  
Zu Biao Ren ◽  
Abdullah Akarim Al-Rabah ◽  
Antonio Pico ◽  
Michael Freeman
Keyword(s):  
Temperature Change ◽  
Heavy Oil ◽  
Acoustic Impedance ◽  
Physical Modeling ◽  
Steam Injection ◽  
Steam Pressure ◽  
Steam Chamber ◽  
Seismic Image ◽  
Cap Rock ◽  
Chamber Size

Abstract The challenge of Heavy oil thermal production Kuwait includes how to monitor steam flood effectiveness and cap rock integrity. Due to shallow & heterogeneous reservoirs and thin cap rock, pressurized and heated steam could diffuse in all directions and breach the cap rock. KOC acquired a baseline & time-lapsed surface seismic and 3D VSP for purposes of monitoring CSS production. This paper presents a technical application of seismic inversion to steam chamber size & cap rock integrity interpretation. The seismic image area includes 13 CSS wells, at varying CSS stages of steam injection, soaking and production. The data acquisition consisted of a base and a time-lapsed monitor seismic; each acquisition period lasting for around a week and separated by 40 day intervals. The simultaneous acquisition of surface seismic and the 3D VSP enabled complimentary data exchange and results validation. Well data of sonic and PHIT are used for building a low frequency inversion model. Rock physical modeling is also required to understand the effect of steam and production changes on acoustic and elastic properties. Various geophysical inversion methods are performed on AI inversion of post & pre stack seismic and Poisson's ratio inversion. To estimate reservoir temperature changes due to steam injection, the calibrated rock-physics model was utilized to relate the AI response to temperature change. The steam injection is expected to decrease acoustic impedance. The AI difference exhibits much wider impedance anomalies revealing steam chamber size and the production zone around the wells at various stages of the CSS cycle. Average temperature maps in reservoirs derived from rock-physical modeling also show temperature change around the wells. Inverted seismic attributes of acoustic impedance and temperature were used for study of cap rock integrity. Interpretation results of the steam size through AI and temperature analysis at reservoir and cap rock enable optimization of our CSS and SF completion strategies include steam pressure and volume, soaking period and thermal production control. The result of cap rock integrity monitoring also indicate no serious damage of cap rock under existing conditions of CSS operation (WHT: 420 °F & WHP: 320 PSI), which defines the limits of strategies to increase steam pressure and volume to increase EOR efficiency.

Mathematical Modeling of Steam Assisted Gravity Drainage

2005 ◽  
Vol 8 (05) ◽  
pp. 372-376 ◽  
Author(s):  
Serhat Akin
Keyword(s):  
Mathematical Model ◽  
Heavy Oil ◽  
Steam Injection ◽  
Viscosity Reduction ◽  
Gravity Drainage ◽  
Heavy Oils ◽  
Production Well ◽  
Steam Chamber ◽  
Steam Assisted Gravity Drainage ◽  
Wide Range

Summary A mathematical model for gravity drainage in heavy-oil reservoirs and tar sands during steam injection in linear geometry is proposed. The mathematical model is based on the experimental observations that the steam-zone shape is an inverted triangle with the vertex fixed at the bottom production well. Both temperature and asphaltene content dependence on the viscosity of the drained heavy oil are considered. The developed model has been validated with experimental data presented in the literature. The heavy-oil production rate conforms well to previously published data covering a wide range of heavy oils and sands for gravity drainage. Introduction Gravity drainage of heavy oils is of considerable interest to the oil industry. Because heavy oils are very viscous and, thus, almost immobile, a recovery mechanism is required that lowers the viscosity of the material to the point at which it can flow easily to a production well. Conventional thermal processes, such as cyclic steam injection and steam-assisted gravity drainage(SAGD), are based on thermal viscosity reduction. Cyclic steam injection incorporates a drive enhancement from thermal expansion. On the other hand, SAGD is based on horizontal wells and maximizing the use of gravity forces. In the ideal SAGD process, a growing steam chamber forms around the horizontal injector, and steam flows continuously to the perimeter of the chamber, where it condenses and heats the surrounding oil. Effective initial heating of the cold oil is important for the formation of the steam chamber in gravity-drainage processes. Heat is transferred by conduction, by convection, and by the latent heat of steam. The heated oil drains to a horizontal production well located at the base of the reservoir just below the injection well. Based on the aforementioned concepts, Butler et al. derived Eq. 1 assuming that the steam pressure is constant in the steam chamber, that only steam flows in the steam chamber, that oil saturation is residual, and that heat transfer ahead of the steam chamber to cold oil is only by conduction. One physical analogy of this process is that of a reservoir in which an electric heating element is placed horizontally above a parallel horizontal producing well.

Review of Research on Interlayer SAGD in Domestic and Foreign

2014 ◽  
Vol 644-650 ◽  
pp. 5142-5145 ◽  
Author(s):  
Peng Luo
Keyword(s):  
Heavy Oil ◽  
Development Process ◽  
Basic Research ◽  
Technical Support ◽  
Oil Field ◽  
Oil Reservoir ◽  
Steam Chamber ◽  
Heavy Oil Reservoir

China is rich in resources of heavy oil.But some oilfield heavy oil reservoir in the development process will encounter interlining, affecting the development effect. In the process of SAGD to carry out the basic research of reservoir interlayer is helpful to identify the basic attributes of reservoir in the interlayer. The interlayer of SAGD development process is helpful to find the study focus and direction of development. Steam chamber breakthrough research achievements of interlining research abroad, summarizes the steam chamber breakthrough interlining, provide technical support for the oil field SAGD breakthrough interlining, it is of great significance for promoting SAGD efficient development.

Viscosity Reduction of Heavy Oil during Slurry-Phase Hydrocracking

2018 ◽  
Vol 42 (1) ◽  
pp. 148-155 ◽  
Author(s):  
Alexander Quitian ◽  
Yatzirih Fernández ◽  
Jorge Ancheyta
Keyword(s):  
Heavy Oil ◽  
Viscosity Reduction ◽  
Slurry Phase
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