适用于双河油田聚驱后油藏的非均相复合驱油体系研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.012

Abstract

Abstract:

For the reservoirs after polymer flooding, the heterogeneity is stronger and the remaining oil distribution is more dispersed, conventional chemical flooding in consequence is difficult to further improve oil recovery effectively. Therefore, a heterogeneous combination flooding system consisting of polymer, preformed particle gel（PPG） and highly effective surfactant has been designed according to the features of medium-high permeability sandstone reservoir in Ⅱx layers of Shuanghe Oil Filed after polymer flooding. Thereafter, the selection of flooding agent, evaluation of thermal stability and Optimization of injection mode have been studied. The experimental results showed that the obtained P/PPG/S system has excellent high viscoelasticity, ultra-low interfacial tension, and thermal stability, which can effectively improve reservoir heterogeneity, expand sweep volume and enhance oil displacement efficiency. Core displacement experiments showed that the oil recovery could further enhance by 27.8 % after the combination flooding of P/PPG system and P/PPG/S system under simulated reservoir conditions. Thus it provides a technical method for effectively enhancing oil recovery after polymer flooding in Shuanghe oilfield.

Key words: reservoir after polymer flooding, heterogeneous combination flooding system, preformed particle gel（PPG）, surfactant, enhanced oil recovery（EOR）

CLC Number:

TE357

WANG Zhengxin,ZHANG Lianfeng,YANG Lu,LIU Yanhua,LU Jun,ZHANG Zhuo. Heterogeneous combination flooding system for reservoir after polymer flooding in Shuanghe Oil Filed[J].Reservoir Evaluation and Development, 2020, 10(6): 78-84.

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References 21

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样品编号	弹性模量/ Pa	黏性模量/ Pa	复数模量/ Pa	复数黏度/ （Pa·s）	粒径/ μm
B	21.5	7.540	22.770	3.624	100~200
C	0.149	0.113	0.186	0.029 7	50~150
D	0.780	0.531	0.950	0.151	50~150
E	0.910	0.740	1.180	0.188	50~150
F	12.3	2.42	12.6	2.0	150~200

注入体系配方	黏度/（mPa·s）	渗透率/ 10^-3μm²	阻力系数	残余阻力系数
1 200 mg/L P	27.7	645	32.3	2.7
1 200 mg/L P+600 mg/L B	68.3	662	373.0	312.5
1 200 mg/L P+600 mg/L C	38.6	653	88.9	8.1
1 200 mg/L P+600 mg/L D	67.2	691	381.8	60.5
1 200 mg/L P+600 mg/L E	63.9	687	390.2	50.8
1 200 mg/L P+600 mg/L F	55.5	630	211.5	31.3

样品浓度/ mg/L	吸附量/ mg/g	洗油能力/ %	界面张力/（ mN·m^-1）
样品浓度/ mg/L	吸附量/ mg/g	洗油能力/ %	初始	老化180 d
2 000	1.71	74	1.02×10^-4	3.72×10^-4

驱油体系	黏度/（mPa·s）	弹性模量G’ / Pa	黏性模量G” / Pa	复合模量G*/ Pa	界面张力/ （mN·m^-1）
1 200 mg/L P	27.7	0.142	0.185	0.233
1 200 mg/L P +2 000 mg/L S	29.9	0.177	0.206	0.294	1.56×10^-3
1 200 mg/LP +600 mg/L PPG	56.3	0.334	0.298	0.448
1 200 mg/L P +600 mg/L PPG+2 000 mg/L S	60.8	0.396	0.334	0.518	3.02×10^-3

化学驱油体系	水驱采收率/ %	一次聚驱采收率/%	最终采收率/%	二次化学驱提高采收率/%
0.5PV P/S二元体系	22.3	42.6	64.4	21.8
0.1PV高浓度聚合物 + 0.35PV P/S二元体系+0.05PV 高浓度聚合物	24.3	41.4	62.5	21.1
0.1PV P/PPG非均相体系+0.35PV P/S二元体系+0.05PV P/PPG非均相体系	23.2	41.9	67.6	25.7
0.1PV P/PPG非均相体系+0.35PV P/PPG/S非均相体系+0.05PV P/PPG非均相体系	23.5	45.9	73.7	27.8

Heterogeneous combination flooding system for reservoir after polymer flooding in Shuanghe Oil Filed

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