Effect of CO2 Pre-Pad in Volume Fracturing of Conglomerate Reservoirs in Mahu Sag, Junggar Basin

doi:10.7657/XJPG20220106

Abstract

Abstract:

The conglomerate reservoirs in the Mahu sag of Junggar basin are tight and the reservoir fluid has a poor flow capacity, resulting in rapid decline and unsteady production. Although the effect of CO₂ pre-pad fracturing is better than that of hydraulic fracturing, no systematic study has been carried out on how CO₂ affects the crude oil and reservoir rocks in Mahu sag. In this study, the displacement ability of CO₂ aqueous solution, the dissolution of core minerals and the changes in core porosity and permeability are analyzed. It is found that in the Mahu conglomerate reservoirs, the crude oil displacing rate by CO₂ aqueous solution is higher than that by pure CO₂ or water. The Mahu conglomerate reservoir has a higher carbonate content, so CO₂ aqueous solution can play a stronger dissolution role and increase the porosity and permeability of the reservoir. Experimental results show that the porosity has increased by 27% on average, and the permeability has increased by 110% on average. The injected CO₂ aqueous solution prefers dissolving calcite first, then dolomite and last chlorite. Mineral dissolution mainly occurs in the first 5 days, and then becomes less after 5 days.

Key words: Mahu sag, conglomerate reservoir, CO₂, crude oil displacement, dissolution, porosity, permeability, mineral composition

CLC Number:

TE357

YI Yonggang, HUANG Kexiang, LI Jie, MOU Shanbo, YU Huiyong, MOU Jianye, ZHANG Shicheng. Effect of CO₂ Pre-Pad in Volume Fracturing of Conglomerate Reservoirs in Mahu Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(1): 42-47.

Figures/Tables 6

Fig. 1.

Table 1

Table 2

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Fig. 2.

Fig. 3.

References 23

[1]	秦积舜, 韩海水, 刘晓蕾. 美国CO₂驱油技术应用及启示[J]. 石油勘探与开发, 2015, 42(2):209-216.
	QIN Jishun, HAN Haishui, LIU Xiaolei. Application and enlightenment of carbon dioxide flooding in the United States of America[J]. Petroleum Exploration and Development, 2015, 42(2):209-216.
[2]	李剑, 段景杰, 姚振杰, 等. 低渗透油藏水驱后注CO₂驱提高采收率影响因素分析[J]. 非常规油气, 2017, 4(6):45-52.
	LI Jian, DUAN Jingjie, YAO Zhenjie, et al. Analysis on influence factors of enhanced oil recovery in CO₂ flooding after water flooding in low permeability reservoir[J]. Unconventional Oil & Gas, 2017, 4(6):45-52.
[3]	江怀友, 沈平平, 陈立滇, 等. 北美石油工业二氧化碳提高采收率现状研究[J]. 中国能源, 2007, 29(7):30-34.
	JIANG huaiyou, SHEN Pingping, CHEN Lidian, et al. The status of EOR technology using CO₂ in North American oil industry[J]. Energy of China, 2007, 29(7):30-34.
[4]	侯冰, 宋振云, 贾建鹏, 等. 超临界二氧化碳对致密砂岩力学特性影响的实验研究[J]. 中国海上油气, 2018, 30(5):109-115.
	HOU Bing, SONG Zhenyun, JIA Jianpeng, et al. Experimental investigation on mechanical properties of tight sandstone under the effect of SC-CO₂[J]. China Offshore Oil and Gas, 2018, 30(5):109-115.
[5]	瞿建华, 张磊, 吴俊, 等. 玛湖凹陷西斜坡百口泉组砂砾岩储集层特征及物性控制因素[J]. 新疆石油地质, 2017, 38(1):1-6.
	QU Jianhua, ZHANG Lei, WU Jun, et al. Characteristics of Sandy Conglomerate reservoirs and controlling factors on physical properties of Baikouquan formation in the western slope of Mahu sag, Junggar basin[J]. Xinjiang Petroleum Geology, 2017, 38(1):1-6.
[6]	WANG Chao, LIU Pengcheng, WANG Fushun, et al. Experimental study on effects of CO₂ and improving oil recovery for CO₂ assisted SAGD in super-heavy-oil reservoirs[J]. Journal of Petroleum Science and Engineering, 2018, 165:1 073-1 080. doi: 10.1016/j.petrol.2018.02.058
[7]	李四海, 夏玉磊, 兰建平, 等. 鄂尔多斯盆地长7致密油储层二氧化碳驱油实验[J]. 科学技术与工程, 2020, 20(6):2 251-2 257.
	LI Sihai, XIA Yulei, LAN Jianping, et al. CO₂ flooding experiment in the Chang-7 tight oil reservoir of Ordos basin[J]. Science Technologyand Engineering, 2020, 20(6):2 251-2 257.
[8]	施雷庭, 户海胜, 张玉龙, 等. 致密砂砾岩矿物与超临界CO₂和地层水相互作用[J]. 油田化学, 2019, 36(4):640-645.
	SHI Leiting, HU Haisheng, ZHANG Yulong, et al. Interaction of tight glutenite minerals with supercritical CO₂ and formation water[J]. Oilfield Chemistry, 2019, 36(4):640-645.
[9]	王广华, 赵静, 张凤君, 等. 砂岩储层中CO₂-地层水-岩石的相互作用[J]. 中南大学学报(自然科学版), 2013, 44(3):1 167-1 173.
	WANG Guanghua, ZHAO Jing, ZHANG Fengjun, et al. Interactions of CO₂-brine-rock in sandstone reservoir[J]. Journal of Central South University(Science and Technology), 2013, 44(3):1 167-1 173.
[10]	杨国栋, 李义连, 马鑫, 等. 绿泥石对CO₂-水-岩石相互作用的影响[J]. 地球科学, 2014, 39(4):462-472.
	YANG Guodong, LI Yilian, MA Xin, et al. Effect of chlorite on CO₂-water-rock interaction[J]. Earth Science, 2014, 39(4):462-472.
[11]	王铁铮, 王长权, 夏玉磊, 等. CO₂与压裂地层置换规律实验研究[J]. 科学技术与工程, 2020, 20(32):13 158-13 162.
	WANG Tiezheng, WANG Changquan, XIA Yulei, et al. Experimental study on displacement law of CO₂ and fractured formation[J]. Science Technology and Engineering, 2020, 20(32):13 158-13 162.
[12]	CUI Maolei, WANG Rui, LV Chengyuan, et al. Research on microscopic oil displacement mechanism of CO₂ EOR in extra-high water cut reservoirs[J]. Journal of Petroleum Science and Engineering, 2017, 154:315-321. doi: 10.1016/j.petrol.2017.04.006
[13]	李四海, 马新仿, 张士诚, 等. CO₂-水-岩作用对致密砂岩性质与裂缝扩展的影响[J]. 新疆石油地质, 2019, 40(3):312-318.
	LI Sihai, MA Xinfang, ZHANG Shicheng, et al. Experimental investigation on the influence of CO₂-brine-rock interaction on tight sandstone properties and fracture propagation[J]. Xinjiang Petroleum Geology, 2019, 40(3):312-318.
[14]	STEVEN B, CHARLES D, JAMES A, et al. Hydrocarbon mobilization mechanisms using CO₂ in an unconventional oil play[J]. Energy Procedia, 2014, 63:7 717-7 723. doi: 10.1016/j.egypro.2014.11.805
[15]	俞天喜, 袁峰, 周培尧, 等. 玛南斜坡上乌尔禾组颗粒支撑砾岩裂缝扩展形态[J]. 新疆石油地质, 2021, 42(1):53-62.
	YU Tianxi, YUAN Feng, ZHOU Peiyao, et al. Fracture propagating shapes in gravel-supported conglomerate reservoirs of upper Wuerhe formation on Manan slope, Mahu sag[J]. Xinjiang Petroleum Geology, 2021, 42(1):53-62.
[16]	袁舟, 廖新维, 赵晓亮, 等. 砂岩油藏CO₂驱替过程中溶蚀作用对储层物性的影响[J]. 油气地质与采收率, 2020, 27(5):97-104.
	YUAN Zhou, LIAO Xinwei, ZHAO Xiaoliang, et al. Effect of dissolution on physical properties of sandstone reservoirs during CO₂ flooding[J]. Petroleum Geology and Recovery Efficiency, 2020, 27(5):97-104.
[17]	周琳淞, 杜建芬, 郭平, 等. 超临界CO₂对疏松砂岩储层物性影响的实验研究[J]. 油田化学, 2015, 32(2):217-222.
	ZHOU Linsong, DU Jianfen, GUO Ping, et al. Influence of supercritical CO₂ on the physical property of unconsolidated sandstone reservoir[J]. Oilfield Chemistry, 2015, 32(2):217-222.
[18]	彭新晶, 刘孟骐, 夏祥斌, 等. 储层砂岩-盐水-超临界CO₂体系相互作用[J]. 中国矿业大学学报, 2013, 42(2):302-307.
	PENG Xinjing, LIU Mengqi, XIA Xiangbin, et al. Interaction of rock-brine-supercritical CO₂ in sandstone reservoir[J]. Journal of China University of Mining & Technology, 2013, 42(2):302-307.
[19]	钱坤, 杨胜来, 窦洪恩, 等. 特低渗油藏不同CO₂注入方式微观驱油特征[J]. 新疆石油地质, 2020, 41(2):204-208.
	QIAN Kun, YANG Shenglai, DOU Hongen, et al. Microscopic characteristics of oil displacement with different CO₂ injection modes in extra-low permeability reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(2):204-208.
[20]	KHALID E, HOSSEIN E, MOHAMED S, et al. Improving oil recovery from shale oil reservoirs using cyclic cold carbon dioxide injection:an experimental study[J]. Fuel, 2019, 254:1-9.
[21]	张中华, 佟颖, 吴永超. 扩散作用对低渗透油藏CO₂驱相渗特征的影响[J]. 西安石油大学学报(自然科学版), 2019, 34(2):73-77.
	ZHANG Zhonghua, TONG Ying, WU Yongchao. Effects of diffusion on relative permeability curves of CO₂ flooding in low permeability reservoirs[J]. Journal of Xi’an Shiyou University (Natural Science Edition), 2019, 34(2):73-77.
[22]	冯程, 石玉江, 郝建飞, 等. 低渗透复杂润湿性储集层核磁共振特征[J]. 石油勘探与开发, 2017, 44(2):252-257.
	FENG Cheng, SHI Yujiang, HAO Jianfei, et al. Nuclear magnetic resonance features of low-permeability reservoirs with complex wettability[J]. Petroleum Exploration and Development, 2017, 44(2):252-257.
[23]	李萍, 胡学军, 许振波, 等. 华北油区岩心老化时间综合确定[J]. 油气地质与采收率, 2001, 8(3):15-17.
	LI Ping, HU Xuejun, XU Zhenbo, et al. Comprehensive determination on aging time of core in Huabei oilfield[J]. Petroleum Geology and Recovery Efficiency, 2001, 8(3):15-17.

Effect of CO₂ Pre-Pad in Volume Fracturing of Conglomerate Reservoirs in Mahu Sag, Junggar Basin

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