水驱砂岩油藏在不同水质下的渗透率时变特征

doi:10.11743/ogg20210520

Abstract

Abstract:

Water injection may lead to a chronical reduction of reservoir permeability due to the blockage of formation pores by suspended solid particles, oil, bacteria, and other impurities in the injected water.For fields under water flooding for quite a long time, it is not wise to continue sticking to the water quality determined on originally measured formation permeability.This study investigates possible formation damage caused by water injection through laboratory experiments on sandstone cores of different permeability from wells with long water injection history according to 5 different standards of water quality(SY/T 5329-2012), and put forward a concept of water quality-sensitive permeability.And through theoretical derivation, a mathematical expression describing the attenuation law of permeability is established to describe changing sandstone reservoir permeability with time during injection of water of different qualities.The criteria for water and reservoir selection are determined for better decision making on injection water quality for high water-cut wells.It provides a theoretical basis for achieving better performance of wells with long-time water flooding through water quality adjustment.

Key words: waterflooding, water injcetion history, permeability retention, water quality-sensitivity, formation damage simulation, waterflooding, sandstone reservoirs, Gudong Oilfield

CLC Number:

TE341

Jianzhong Wang, Xiankun Song, Yingchao Fu, Lianting Sun, Jinjie Xu. Time-varying permeability of sandstone reservoirs under waterflooding of different water quality[J]. Oil & Gas Geology, 2021, 42(5): 1234-1242.

Figures/Tables 14

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序号	因素	特征
1	水敏、盐敏、速敏和应力敏感	与地层岩石不配伍引起敏感性粘土矿物膨胀、分散、微粒运移和操作不平稳引起的应力敏感伤害
2	结垢	与地层流体不配伍引起结垢堵塞地层
3	微生物和系统腐蚀产物	孔喉堵塞
4	悬浮固相	粒径和含量共同作用引起堵塞
5	含油量	油珠液锁、堵塞及降低水相渗流能力
6	微生物	直接参与或加剧腐蚀，如硫酸盐还原菌(SRB)

水质等级	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ
注入层平均空气渗透率/(10^-3 μm²)	< 10	10~50	50~500	500~1 500	>1 500
悬浮固体含量/(mg·L^-1)	≤1.0	≤2.0	≤5.0	≤10.0	≤30.0
含油量/(mg·L^-1)	≤5.0	≤6.0	≤15.0	≤30.0	≤50.0

岩心气测渗透率	(K_g)=213.91×10^-3 μm²
无因次注入量(Qi)	5	10	20	50	100	150	200
岩心渗透率保留率(K/K₀)	0.971	0.958	0.851	0.708	0.591	0.443	0.312

地层渗透率/(10^-3 μm²)	θ/10^-3
地层渗透率/(10^-3 μm²)	Ⅰ级水质	Ⅱ级水质	Ⅲ级水质	Ⅳ级水质	Ⅴ级水质
1 500~2 000	1.2~2.3	1.6~3.1	2.4~3.8	3.7~5.3	5.3~6.7
500~1 500	2.3~4.5	3.1~5.9	3.8~6.6	5.3~8.5	6.7~9.5
50~500	4.5~5.2	5.9~7.8	6.6~9.2	8.5~9.4	9.5~11.7
10~50	5.2~11.9	7.8~13.2	9.2~13.9	9.4~14.8	11.7~16.7
1~10	11.9~13.4	13.2~14.4	13.9~15.0	14.8~16.0	16.7~17.9

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Time-varying permeability of sandstone reservoirs under waterflooding of different water quality

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