Influences of Low-Temperature Oxidation on Oil Recovery During Oxygen-Reduced Air Flooding in Guo-8 Block of Yuguo Oilfield

doi:10.7657/XJPG20240310

Abstract

Abstract:

Oxygen-reduced air injection is an effective technique for developing low-permeability oil reservoirs. Under reservoir conditions, oxygen-reduced air can undergo low-temperature oxidation reaction with crude oil, thereby enhancing oil recovery. Regarding the inadequate understanding of the mechanism underlying the oxygen-reduced air flooding for enhanced oil recovery (EOR) in the Guo-8 block of the Yuguo oilfield, isothermal oxidation experiments and long-core displacement experiments were conducted to investigate the influences of oil oxidation process and generated substances on EOR. The results of the isothermal oxidation experiments indicate that sedimentary substances are generated during the low-temperature oxidation process of light oil. With the increase of temperature, the degree of oxidation significantly increases, with the sedimentation of heavy components reaching 1.25×10^-3 g/g at 89°C, 3.43×10^-3 g/g at 100°C, and 5.02×10^-3 g/g at 120 ℃. The results of the long-core displacement experiments demonstrate that the sedimentation of heavy components at different oxidation temperatures affects EOR. With temperature increasing, the timing of gas channeling delays, the sweeping effect improves, and the final recovery increases to 52.77%, 58.89%, and 65.23% at temperatures of 89°C, 100°C, and 120°C, respectively.

Key words: Yuguo oilfield, Guo-8 block, oxygen-reduced air flooding, low-temperature oxidation, light oil, EOR, gas chromatography, long-core displacement experiment, component analysis

CLC Number:

TE348

XIAO Zhipeng, ZHANG Yanbin, LI Qihang, LI Yiqiang, HAN Jifan, YAN Qian, WU Yong’en. Influences of Low-Temperature Oxidation on Oil Recovery During Oxygen-Reduced Air Flooding in Guo-8 Block of Yuguo Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(3): 334-339.

Figures/Tables 9

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References 22

[1]	郭小哲, 赵健, 高旺来, 等. 稠油油藏多轮次减氧空气吞吐后复合注气增油机理[J]. 新疆石油地质, 2022, 43(4):450-455.
	GUO Xiaozhe, ZHAO Jian, GAO Wanglai, et al. EOR mechanism of compound gas injection after multiple cycles of oxygen-reduced air huff and puff in heavy oil reservoirs[J]. Xinjiang Petroleum Geology, 2022, 43(4):450-455.
[2]	夏正春, 赵健, 刘锋, 等. 吐哈探区稠油油藏注气吞吐适应性评价[J]. 新疆石油地质, 2023, 44(3):341-346.
	XIA Zhengchun, ZHAO Jian, LIU Feng, et al. Adaptability evaluation of gas huff-n-puff in heavy oil reservoirs in Tuha exploration area[J]. Xinjiang Petroleum Geology, 2023, 44(3):341-346.
[3]	丁冠阳, 黄世军, 张雪娇. 低渗透油藏油井递减后产量递减不确定性评价方法[J]. 大庆石油地质与开发, 2017, 36(4):47-51.
	DING Guanyang, HUANG Shijun, ZHANG Xuejiao. Evaluating method of the production decline uncertainty for low permeability oil reservoirs[J]. Petroleum Geology & Oilfield Development in Daqing, 2017, 36(4):47-51.
[4]	袁士义, 王强, 李军诗, 等. 注气提高采收率技术进展及前景展望[J]. 石油学报, 2020, 41(12):1623-1632. doi: 10.7623/syxb202012014
	YUAN Shiyi, WANG Qiang, LI Junshi, et al. Technology progress and prospects of enhanced oil recovery by gas injection[J]. Acta Petrolei Sinica, 2020, 41(12):1623-1632. doi: 10.7623/syxb202012014
[5]	FASSIHI M R, YANIMARAS D V, WESTFALL E E, et al. Economics of light oil air injection projects[C]. Tulsa: SPE/DOE Tenth Symposium on Improved Oil Recovery, 1996.
[6]	PARRISH D R, POLLOCK C B, NESS N L, et al. A tertiary COFCAW pilot test in the Sloss field,Nebraska[J]. Society of Petroleum Engineers, 1974, 26(6):667-675.
[7]	王正茂, 廖广志, 蒲万芬, 等. 注空气开发中地层原油氧化反应特征[J]. 石油学报, 2018, 39(3):314-319. doi: 10.7623/syxb201803006
	WANG Zhengmao, LIAO Guangzhi, PU Wanfen, et al. Oxidation reaction features of formation crude oil in air injection development[J]. Acta Petrolei Sinica, 2018, 39(3):314-319. doi: 10.7623/syxb201803006
[8]	廖广志, 王红庄, 王正茂, 等. 注空气全温度域原油氧化反应特征及开发方式[J]. 石油勘探与开发, 2020, 47(2):334-340. doi: 10.11698/PED.2020.02.11
	LIAO Guangzhi, WANG Hongzhuang, WANG Zhengmao, et al. Oil oxidation in the whole temperature regions during oil reservoir air injection and development methods[J]. Petroleum Exploration and Development, 2020, 47(2):334-340.
[9]	林伟民, 邓瑞健, 刘勇, 等. 中原油田轻质油藏注空气低温氧化反应机理研究[J]. 油田化学, 2013, 30(4):534-538.
	LIN Weimin, DENG Ruijian, LIU Yong, et al. The mechanism of low temperature oxidation by air injection process in Zhongyuan light oil reservoir[J]. Oilfield Chemistry, 2013, 30(4):534-538.
[10]	王杰祥, 王腾飞, 杨长华, 等. 轻质原油低温氧化催化技术[J]. 石油学报, 2015, 36(10):1260-1266. doi: 10.7623/syxb201510008
	WANG Jiexiang, WANG Tengfei, YANG Changhua, et al. Low-temperature oxidation catalytic technology of light crude oil[J]. Acta Petrolei Sinica, 2015, 36(10):1260-1266. doi: 10.7623/syxb201510008
[11]	席长丰, 王伯军, 赵芳, 等. 轻质油藏高压注空气氧化特征与热混相驱技术[J]. 石油勘探与开发, 2022, 49(4):760-769. doi: 10.11698/PED.20210767
	XI Changfeng, WANG Bojun, ZHAO Fang, et al. Oxidization characteristics and thermal miscible flooding of high pressure air injection in light oil reservoirs[J]. Petroleum Exploration and Development, 2022, 49(4):760-769.
[12]	FASSIHI M R, YANNIMARAS D V, KUMARV K. Estimation of recovery factor in light-oil air-injection projects[J]. SPE, 1997, 12(3):173-178.
[13]	JIA Hu, ZHAO Jinzhou, PU Wanfen, et al. Laboratory investigation on the feasibility of light-oil autoignition for application of the high-pressure air injection (HPAI) process[J]. Energy & Fuels, 2012, 26(9):5638-5645.
[14]	蒋有伟, 张义堂, 刘尚奇, 等. 低渗透油藏注空气开发驱油机理[J]. 石油勘探与开发, 2010, 37(4):471-476.
	JIANG Youwei, ZHANG Yitang, LIU Shangqi, et al. Displacement mechanisms of air injection in low permeability reservoirs[J]. Petroleum Exploration and Development, 2010, 37(4):471-476.
[15]	WANG Liangliang, WANG Tengfei, BAI Zongxian, et al. Thermo-oxidative behavior and kinetics analysis of light and heavy oils based on TG,DSC,and FTIR[J]. Geoenergy Science and Engineering, 2023, 223:211525.
[16]	于洪敏, 任韶然, 杨宝泉, 等. 低渗油藏注空气低温氧化数值模拟研究[J]. 西南石油大学学报(自然科学报), 2008, 30(6):117-120.
	YU Hongmin, REN Shaoran, YANG Baoquan, et al. Numerical simulation of air injection low temperature oxidation in low permeability reservors[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2008, 30(6):117-120.
[17]	TURTA A T, SINGHAL A K. Reservoir engineering aspects of oil recovery from low permeability reservoirs by air injection[C]. Beiing: SPE Intemational Conference and Exhibition, 1998.
[18]	GUTIÉRREZ D, TALORA R, KUMAR V K, et al. Recovery factors in high-pressure air injection projects revisited[J]. SPE Reservoir Evaluation & Engineering, 2008, 11(6):1097-1106.
[19]	王腾飞, 王亮亮, 王杰祥, 等. 催化空气驱技术低温氧化催化机理及油藏适应性[J]. 石油学报, 2023, 44(7):1118-1128. doi: 10.7623/syxb202307008
	WANG Tengfei, WANG Liangliang, WANG Jiexiang, et al. Low-temperature oxidation catalysis mechanism and oil reservoir adaptability of catalytic air flooding technique[J]. Acta Petrolei Sinica, 2023, 44(7):1118-1128. doi: 10.7623/syxb202307008
[20]	JIA Hu, SHENG J J. Numerical modeling on air injection in a light oil reservoir:Recovery mechanism and scheme optimization[J]. Fuel, 2016, 172:70-80.
[21]	GUTIERREZ D, MOORE R G, MEHTA S A, et al. The challenge of predicting field performance of air injection projects based on laboratory and numerical modelling[J]. Journal of Canadian Petroleum Technology, 2009, 48(4):23-34.
[22]	齐桓, 李宜强, 陈小龙, 等. 轻质原油减氧空气驱低温氧化特征[J]. 石油勘探与开发, 2021, 48(6):1210-1217. doi: 10.11698/PED.2021.06.12
	QI Huan, LI Yiqiang, CHEN Xiaolong, et al. Low-temperature oxidation of light crude oil in oxygen-reduced air flooding[J]. Petroleum Exploration and Development, 2021, 48(6):1210-1217.

岩心编号	长度/ mm	直径/ mm	气测渗透率/ mD	液测渗透率/ mD	孔隙度/ %	含油饱和度/ %
1	300.81	24.20	8.28	3.24	15.94	65.08
2	300.82	24.48	8.34	3.21	14.66	65.40
3	298.08	24.20	8.24	3.17	15.43	66.38