Experimental Research on the Effect of Residual Oil Saturation on Fire Flooding Development in the Late Stage of Steam Injection

Yang, Yang; Peng, Xiaoqiang; Zhang, Jizhou; Hao, Hong-yong

doi:10.1007/978-981-16-0761-5_63

Cited by 1 publication

(2 citation statements)

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“…Additionally, due to the similarity in viscosity between nitrogen and dry steam, as shown in Figure 17 [22], this characteristic can reduce the viscous fingering effect, stabilize the displacement front, and improve oil displacement efficiency. Within the steam-swept region, the wettability of the reservoir rock changes from oilwet to water-wet, and the residual oil at the top of steam chamber after gravity drainage is mainly distributed as 'isolated droplets' in the pore space [23]. Due to the gas being non-wetting relative to oil, injected gas tends to occupy the center of the pore space, leading to the mobilization and downward movement of residual oil.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

“…Residual oil saturation formed by gravity drainage with non-condensable gas is very low, theoretically achieving 100% oil displacement efficiency [24,25]. The downward displacement of crude 30.00 58.17 Within the steam-swept region, the wettability of the reservoir rock changes from oil-wet to water-wet, and the residual oil at the top of steam chamber after gravity drainage is mainly distributed as 'isolated droplets' in the pore space [23]. Due to the gas being nonwetting relative to oil, injected gas tends to occupy the center of the pore space, leading to the mobilization and downward movement of residual oil.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

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Study on Characteristics of Steam Chamber and Factors Influencing Nitrogen-Assisted Vertical–Horizontal Steam Drainage Development

Zheng,

Yu,

Huang

et al. 2024

Processes

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With the notable achievements attained through the implementation of steam-assisted gravity drainage (SAGD), the vertical–horizontal steam drive (VHSD) emerges as a pivotal technological advancement aimed at significantly enhancing the efficiency of thin reservoir heavy oil recovery subsequent to steam cyclic stimulation. The inclusion of nitrogen assistance has proven effective in enhancing the efficacy of gravity drainage techniques in reservoir development. However, it is noteworthy that this method has only led to improvements in approximately 50% of the well groups within the observed field. The comprehensive evaluation index of VHSD was proposed, and as the objective function, it was determined that the greatest contribution to the VHSD technique lies in oil saturation, accounting for 40% of the overall evaluations. This differs from conventional SAGD operations, where reservoir thickness serves as the primary determinant. Building upon an enhanced physical simulation similarity criterion, two comparative injection scheme experiments were conducted to explore the impact of nitrogen injection on the performance of VHSD and the characteristics of the steam chamber. Nitrogen is distributed in the vicinity of the steam chamber, leading to the formation of a dual mechanism characterized by ‘top heat insulation and lateral traction’ on the steam chamber. The lateral traction accounts for approximately 25% of the team chamber volume. Additionally, the inducement of nitrogen causes a downward displacement of crude oil, resulting in its accumulation within the high-temperature region of the steam chamber. This, in turn, enhances the contact area between the high-temperature steam and the crude oil, ultimately leading to improvement in production efficiency. Further validation of the impact of nitrogen on steam lateral traction and interlayer steam drainage within the reservoir was confirmed using Xinjiang oilfield testing. The well temperature increased from 75 °C to 130 °C.

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Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%