Full-Diameter Physical Simulation of Oxygen-Reducing Air Assisted Gravity Drainage: A Case Study of Gasikule E13 Reservoir in Qinghai Oilfield

doi:10.7657/XJPG20210508

Abstract

Abstract:

Compared with conventional gas injection methods, the gas-injection assisted gravity drainage has the advantages of restraining gas channeling and expanding swept volume. In this study, a static low-temperature oxidation experiment was conducted to investigate the adaptability of the oxygen-reducing air-assisted gravity drainage in the Gasikule E¹₃ reservoir. Oxygen-reducing air-assisted gravity drainage experiment was carried out with the help of natural full-diameter long core, so as to study the influences of oxygen volume fraction, gas injection rate and core inclination angle on the oxygen-reducing air-assisted gravity drainage. The results show that the oxygen-reducing air with low oxygen volume fraction (5%) plays a significant role in low-temperature oxidation in the Gasikule E¹₃ reservoir, and the oxygen consumption rate can reach 2.19 mol/(h·mL). For the oxygen-reducing air-assisted gravity drainage, under the conditions of the Gasikule E¹₃ reservoir, the ultimate recovery increases with an increased oxygen volume fraction of the injected air. The incremental recovery factor of the core experiment ranges from 1.2% to 6.9%. From the perspective of recovery ratio and safety, oxygen-reducing air with the oxygen volume fraction slightly lower than 10% can be applied as the displacement medium. Viscous fingering may occur when the gas injection rate is more than 1.0 mL/min, while capillary retention may occur when the oxygen injection rate is less than 0.1 mL/min, resulting in relatively low recovery factor. When the gas injection rate is 0.3 mL/min, it is a stable oil and gas flooding with a higher recovery factor. The process of the oxygen-reducing air-assisted gravity drainage is relatively sensitive to gravity. For the reservoirs with small inclination angles, the oxygen-reducing air-assisted gravity drainage is still feasible to some extent. The factors that affect the oxygen-reducing air-assisted gravity drainage in the Gasikule E¹₃ reservoir are gas injection rate, core inclination angle and oxygen volume fraction in sequence according to their sensitivities.

Key words: Qinghai oilfield, Gasikule, oxygen-reducing air-assisted gravity drainage, full-diameter core, physical simulation, low-temperature oxidation, gas injection rate, oxygen volume fraction

CLC Number:

TE357.46

LONG Anlin, QI Qingshan, CHEN Xiaolong, LI Yiqiang, LU Shanshan, ZHANG Pei, LI Xin. Full-Diameter Physical Simulation of Oxygen-Reducing Air Assisted Gravity Drainage: A Case Study of Gasikule E¹₃ Reservoir in Qinghai Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(5): 565-571.

Figures/Tables 9

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References 22

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Full-Diameter Physical Simulation of Oxygen-Reducing Air Assisted Gravity Drainage: A Case Study of Gasikule E¹₃ Reservoir in Qinghai Oilfield

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实验因素	实验编号	氧气体积分数/%	注气速度/ （mL·min^-1）	倾角/ （°）
氧气体积分数	1	0	0.1	87
	2	5
	3	10
	4	15
注气速度	5	10	0.1	87
	6		0.3
	7		1.0
倾角	8	10	0.3	0
	9			10
	10			20
	11			45
	12			90

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