Chemical Additives and Foam to Enhance SAGD Performance

Li, Ran; Etminan, S. Reza; Chen, Zhangxin

doi:10.2118/174489-ms

Cited by 10 publications

(4 citation statements)

References 67 publications

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“…加拿大Athabasca地区在1988年也曾经进行蒸汽泡沫驱现场试验, 试验中表面活性剂的注入速度为500~1400 L/d, 最终产油上升30% [69] . Fried-mann等人 [70] 图 2 剩余油饱和度分布图 [73] . (a) 常规SAGD; (b) SAGD-化学泡沫复合驱…”

Section: 黏度在50℃下为2×10unclassified

Review on the effective recovery of SAGD production for extra and super heavy oil reservoirs

Chen

et al. 2020

Sci. Sin.-Tech.

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Section: 黏度在50℃下为2×10unclassified

Review on the effective recovery of SAGD production for extra and super heavy oil reservoirs

Chen

et al. 2020

Sci. Sin.-Tech.

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“…In addition, interlayer can also have an impact on SAGD production, Dou and Li carried out a thermal recovery physical simulation experiment to study the influence of interlayer on steam cham-ber, and the result showed that the steam chamber was forced to develop laterally along the interlayer [33]. Meanwhile, in order to enhance SAGD recovery, multiple media-assisted SAGD technologies such as expanding solvent-SAGD, noncondensate gas-assisted SAGD (CO 2 , N 2 , flue gas, and natural gas), and foam-assisted SAGD have been proposed [34][35][36][37]. These techniques decreased the steam consumption and steam heat loss; the development of steam chamber is promoted.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Well Placement Optimization for Steam-Assisted Gravity Drainage to Enhance Recovery of Thin Layer Oil Sand Reservoirs

et al. 2021

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SAGD (steam-assisted gravity drainage) technique is one of the most efficient thermal recovery technologies for exploiting Mackay River thin layer oil sand reservoirs. However, when making use of the traditional SAGD technique (the production and injection well are located on the same axis with the horizontal well spacing of 0 m), the steam chamber development is usually insufficient because of the high longitudinal sweep rate of steam, which seriously influences the SAGD performance for developing thin layer oil sand reservoirs especially. It is extremely important to find an economical and practicable method to promote the steam chamber development in thin oil sand reservoirs in the process of SAGD production; optimizing well placement is a reliable method. In this paper, an improved well placement method is proposed to enhance production performance of traditional SAGD, which is changing the horizontal well spacing to place the production well below of the side of the injection well (two wells are not located on the same axis). Three groups of 2D visualization experiments with different horizontal distances between two wells (0 cm, 10 cm, and 20 cm) were carried out, respectively, to observe the development and change of the steam chamber development, and to explore the EOR mechanisms. On the 2D experiment basis, optimal horizontal distance was selected to perform 3D physical simulation experiment to study and verity the production mechanism systematically. The results of 2D visualization experiment showed that the final oil recoveries of experimental groups with 10 cm and 20 cm horizontal distances were 7.6% and 2.3% higher than those of traditional SGAD (horizontal distance was 0 cm), respectively. Combined with 3D experimental results, the change in the horizontal relative position of two wells makes the steam first spread laterally between injecting and producing wells; thus, the lateral development of the steam chamber was promoted, and changes of temperature field also display that the lateral sweep area of steam was increased obviously and the form of steam chamber is changed. Meanwhile, the generation of appropriate horizontal well spacing can combine the effect of steam displacement and gravity drainage better and improve the sweep efficiency of steam. Nevertheless, the overlarge horizontal well spacing will also hinder the steam chamber development because the strength of steam overlap is weakened. Furthermore, the findings of this study help for better understanding that changing the horizontal well spacing can promote the lateral development of steam chamber, which can be used to enhance the oil recovery of thin layer oil sand reservoirs especially.

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“…Accordingly, foam generation causes some portion of the injected gas to be transferred to the reservoir areas that is not swept previously. This improves the sweep efficiency in the reservoir. ,,, Also, the efficiency of steam-assisted gravity drainage (SAGD) method can be improved with contribution of foam. , …”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Immiscible Foam Propagation in Porous Media in the Presence of Oil Using an Implicit-Texture Foam Model

et al. 2021

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Gas injection is one of the established methods in enhanced oil recovery. Nevertheless, poor sweep efficiency and viscous instabilities result in early gas breakthrough. Lowering injected gas mobility through foaming is a potential solution to solve the forenamed challenges. Although foaming of the injected gas has been proposed in various stages of oil production, comparatively few studies are carried out about foam injection modeling in the presence of oil. In this study, we aimed to numerically investigate the immiscible foam propagation in a thick, heterogeneous, water-flooded sandstone reservoir with a primary goal to control the surge of the produced gas–oil ratio (GOR) and also the possible incremental oil production by foam. To this end, the implicit-texture local-equilibrium foam model was used to address that how a stable foam front could affect fluid saturation and their mobility in the presence of waterflood residual oil. We treated the reservoir model by considering a pair of horizontal injection/production well through the upper and lower parts of the reservoir to mimic the foam-assisted gravity drainage scheme. Foam generation was considered through alternating (SAG) and simultaneous injection of gas and surfactant solution, and its performance was compared with continuous gas injection and water alternating gas injection. Results showed that gas-phase mobility was reduced in the presence of foam, leading to delaying of gas breakthrough and thereby improvement of gas sweep efficiency. The latter caused a significant reduction in produced gas–oil ratio, enhanced the control of the front movement, and resulted in better oil sweeping. In comparison to the SAG method, occurrence of fingering phenomena in foam co-injection was less likely. In addition, foam front in co-injection method exhibited relatively slower movement compared to the SAG method. Also, with ignoring the prescribed pressure constraint in injection well, the stability and uniformity of the generated foam front decreased, leading to more occurrences of fingering and thus reduction in oil recovery.

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Chemical Additives and Foam to Enhance SAGD Performance

Cited by 10 publications

References 67 publications

Review on the effective recovery of SAGD production for extra and super heavy oil reservoirs

Review on the effective recovery of SAGD production for extra and super heavy oil reservoirs

Experimental Study on Well Placement Optimization for Steam-Assisted Gravity Drainage to Enhance Recovery of Thin Layer Oil Sand Reservoirs

Numerical Study of Immiscible Foam Propagation in Porous Media in the Presence of Oil Using an Implicit-Texture Foam Model

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