微囊引发剂控制聚合凝胶体系成胶实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.005

Abstract

Abstract:

In-situ polymerization gel system is one of the important measures to alleviate reservoir heterogeneity. In order to solve the problem that the gelation time of in-situ polymerization gel system is too fast, taking polyvinyl butyral（PVB） as the wall material and the mixture of ethanol and water as solvent, the delayed gelation microcapsule initiator with ammonium persulfate as the active core has been prepared by interfacial precipitation method. Meanwhile, the performance of microcapsule regulating gelation time of in-situ polymerization gel system has been studied. By mixing 0.05 % ethanol solution of PVB with aqueous solution containing ammonium persulfate and 0.6 % compound stabilizer（OP-10 and Tween 80） at a volume ratio of 7:3, microcapsule initiator with an average particle size of 0.7~1.5 μm have been prepared, and the optimal concentration of ammonium persulfate is 0.2 % ~ 0.4 %. At 40 ~ 90 ℃, the gelation time can be longer than 30 h by adjusting the concentration of microcapsule initiator. Core test result shows that the microcapsule initiator can be successfully injected into the core with an average permeability of 50×10^-3 μm², and initiate the polymerization of in-situ polymerized gel system to produce effective plugging. The in-situ polymerization systems with initiator microcapsules can be injected into reservoirs with an average permeability of 50×10^-3 μm², and initiate the polymerization of in-situ polymerization gel system to produce effective plugging. The enhanced oil recovery（EOR） result indicates that the oil recovery increases by 20.24 % after the gelation of the in-situ polymerization gel system.

Key words: interfacial precipitation method, microcapsule initiator, profile control, gelation time, enhanced oil recovery

CLC Number:

TE39

SHAO Minglu,YUE Xiangan,HE Jie. Gelation studies of polymeric gel system based on microcapsule initiator[J].Reservoir Evaluation and Development, 2020, 10(6): 33-39.

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温度/ ℃	过硫酸铵成胶时间/h	引发剂微囊成胶时间/h	温度/ ℃	过硫酸铵成胶时间/h	引发剂微囊成胶时间/h
40	2.5	未成胶	80	<0.5	35
50	1.5	未成胶	85	<0.5	29
60	0.5	未成胶	90	<0.5	23
70	<0.5	47	95	<0.5	16
75	<0.5	42	100	<0.5	8

微囊加量/ %	成胶时间/h
微囊加量/ %	40 ℃	50 ℃	60 ℃	70 ℃	80 ℃	90 ℃	100 ℃
0.10	未成胶	未成胶	未成胶	未成胶	41/I	33/D	20/C
0.25	未成胶	未成胶	未成胶	47/I	35/I	23/D	8/C
0.50	未成胶	未成胶	32/I	21/I	8/I	7/D	2.5/C
0.75	43/I	37/I	18/I	11/I	5/I	2/D	<0.5
1.00	19/I	14/I	11/I	8/I	2/I	<0.5	<0.5

Gelation studies of polymeric gel system based on microcapsule initiator

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