Impacts of Rock Mineral Composition and Structure of Conglomerate Reservoirs on Enhanced Oil Recovery of Polymer-Surfactant Binary Flooding

doi:10.7657/XJPG20250213

Abstract

Abstract:

The complex mineral components of conglomerate reservoirs have active surface physical and chemical properties, making them liable to interact with polymers and surfactants. These interactions may result in loss and alteration of binary flooding formulations underground. By using core samples from different types of conglomerate reservoirs, the microscopic structure and mineral composition/content were investigated, specific surface area and Zeta potential were measured, and the adsorption charts of chemical agents on the cores were established. Through oil displacement experiments, the impacts of rock mineral composition and structure of conglomerate reservoirs on the recovery of polymer-surfactant binary flooding was validated. The results show that in conglomerate reservoirs, clay and zeolite minerals have large specific surface areas and high Zeta potentials, and their active physical and chemical properties affect oil displacement efficiency. The cores from Class I reservoirs with the best petrophysical properties exhibited the highest ultimate recovery factor, the cores from Class II reservoirs with the lowest content of active minerals achieved the highest chemical flooding efficiency, while the cores from Class III reservoirs showed the lowest oil displacement efficiency.

Key words: conglomerate reservoir, mineral composition, surfactant, polymer, physical and chemical property, adsorption, recovery factor

CLC Number:

TE39

ZHANG Chaoliang, LI Jun, YAN Xiaolong, LYU Jianrong, ZHANG Defu, DOU Ping. Impacts of Rock Mineral Composition and Structure of Conglomerate Reservoirs on Enhanced Oil Recovery of Polymer-Surfactant Binary Flooding[J]. Xinjiang Petroleum Geology, 2025, 46(2): 231-239.

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岩心编号	分选系数	偏态	峰态	变异系数	饱和度中值压力/ MPa	饱和度中值半径/ μm	排驱压力/ MPa	最大孔喉半径/μm	视退汞效率/%	视孔喉体积比	平均毛细管半径/μm	均质系数	非饱和孔隙体积/ %
Y1	3.46	0.31	1.77	0.46	0.17	4.30	0.01	81.75	25.50	2.92	18.58	0.18	3.47
Y2	3.31	0.07	1.65	0.30	1.63	1.16	0.02	30.30	36.79	1.72	8.20	0.16	10.59
Y3	2.30	-0.38	1.92	0.21	3.98	0.18	0.50	1.66	51.56	0.94	0.91	0.14	21.87
Y4	1.10	-2.08	6.67	0.08			1.91	0.38	29.35	2.41	0.08	0.14	53.62

储集层类型	孔隙类型	孔隙结构参数					物性参数
储集层类型	孔隙类型	变异系数	中值压力/MPa	排驱压力/MPa	孔喉半径/μm	最大连通喉道半径/μm	孔隙度/%	渗透性
Ⅰ类	原生粒间孔、粒间溶孔	>0.30	<2.2	较低	>80	<15.00	>20、>100	好—极好
Ⅱ类	原生粒间孔、粒间溶孔	0.15~0.30	2.2~4.0	0.2~0.7	<80	7.50~1.40	15~20、50~100	中等
Ⅲ类	杂基内微孔、晶间孔	0.16~0.22	4.0~6.0	0.5~1.1	偏小	1.40~0.83	10~15、30~50	差
Ⅳ类	杂基内微孔、晶间孔	<0.10	<4.0	>1.0	很小	0.38	<10、<30	很差

储集层矿物组构	样品名称	BET比表面积/ （m²·g^-1）	Langmuir比表面积/ （m²·g^-1）
岩石骨架矿物	石英	0.05	0.12
岩石骨架矿物	长石	1.47	2.89
碳酸盐矿物	方解石	3.67	5.71
碳酸盐矿物	白云石	0.84	1.67
黏土矿物	高岭石	15.70	22.67
	伊利石	20.62	21.06
	绿泥石	23.76	25.87
	蒙脱石	40.21	57.54
硅铝酸盐矿物	沸石	31.58	43.24
砾岩储集层天然岩心	Y1	3.50	4.94
	Y2	2.13	3.12
	Y3	4.40	5.45
	Y4	2.12	3.15

样品名称	Zeta电位/mV
高岭石	-8.98
蒙脱石	-21.03
伊利石	-8.18
绿泥石	-17.80
方解石	0.22
长石	-4.75
沸石	-24.47
Y1	-28.45
Y2	-18.21
Y3	-21.57
Y4	-19.41
聚合物	-3.87
KPS表面活性剂	-37.70