多重交联水凝胶体系的抗剪切性能评价研究

doi:10.3969/j.issn.2097-2806.2023.10.008

Abstract

Abstract:

The strong shear degradation in the injection process of gel profile control and flooding system has seriously hindered the effectiveness of construction application. It is very important to improve the shear resistance of gel profile control and flooding system and achieve high-efficiency deep profile control and flooding. The multi-crosslinked hydrogel systems in which hydrophobically associating polymer （DHAP） and partially hydrolyzed polyacrylamide （HPAM） were used as the main agents were studied in the aspects of shear resistance, gel forming performance, aging stability, plugging ability and the effect of profile control and flooding. The results showed that the viscosity loss of DHAP was only 4% after being sheared by a blast hole with an injection rate of 175 mL/min, and high strength of 15 Pa·s was still obtained after crosslinking and gelling, and the plugging rate in porous media could reach 91%. In the parallel core displacement experiment, effective profile control and flooding could be achieved, the sweep efficiency of low-permeability cores was expanded, and the oil recovery was improved by 10% compared with the HPAM-based system. By appropriately reducing the covalent crosslinking density, the hydrogel system of moderate covalent crosslinking+non-covalent crosslinking could exhibit good ability of profile control and flooding in porous media.

Key words: gel system, shear degradation, profile control and displacement, plugging efficiency, non-covalent crosslinking

CLC Number:

TE357

Pu Cao, Zhu Shijie, Liu Lijuan, Wang Shikai, Xu Jiangen, Liu Zhezhi. Evaluation of shear resistance of multi-crosslinked hydrogel system[J].China Surfactant Detergent & Cosmetics, 2023, 53(10): 1173-1179.

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References 19

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	主剂	交联用剂			交联助剂	调节剂
实验用剂A	部分水解聚丙烯酰胺HPAM	六亚甲基四胺	间苯二酚	无机Cr³⁺	表面活性剂P150	柠檬酸
实验用剂B	疏水缔合聚合物LSRP	六亚甲基四胺	间苯二酚	无机Cr³⁺	表面活性剂P150	柠檬酸
质量分数/%	0.25	0.1	0.1	0.5	0.01	0.1

反应过程	反应方程
六次甲基四胺加热生成甲醛
甲醛与间苯二酚反应生成多羟甲基间苯二酚
甲醛与聚合物酰胺基团交联
多羟甲基间苯二酚与聚合物酰胺基团缩聚反应
Cr³⁺与聚合物羧基产生离子交联

实验类型	聚合物类型	填砂管	渗透率/ （×10³μm²）	孔隙度/ %	饱和油量/mL	含油饱和度/%
1	未剪切的体系A	A#	251	24.6	50.8	84.1
1	未剪切的体系A	B#	84	17.4	32.1	75.2
2	剪切后的体系A	A#	243	24.4	49.9	83.4
2	剪切后的体系A	B#	78	17.3	31.6	74.5
3	未剪切的体系B	A#	265	24.8	51.8	85.1
3	未剪切的体系B	B#	90	17.6	32.2	74.6
4	剪切后的体系B	A#	256	24.3	51.4	86.2
4	剪切后的体系B	B#	91	17.6	32.0	74.2

部分水解聚丙烯酰胺HPAM				疏水缔合聚合物DHAP
编号	注入速度/ （mL/min）	成胶时间/ h	成胶强度/ （mPa·s）	编号	注入速度/ （mL/min）	成胶时间/ h	成胶强度/ （mPa·s）
1-A#	25	12~24	6 533	1-B#	25	12~24	26 533
2-A#	50	12~24	6 127	2-B#	50	12~24	26 321
3-A#	75	12~24	5 834	3-B#	75	12~24	25 347
4-A#	100	18~36	4 852	4-B#	100	18~36	24 745
5-A#	125	18~36	2 428	5-B#	125	18~36	19 323
6-A#	150	18~36	1 952	6-B#	150	18~36	16 744
7-A#	175	24~48	1 324	7-B#	175	24~48	15 234

主剂类型	剪切强度	渗透率/（×10³ μm²）		封堵率/%
主剂类型	剪切强度	注入前	注入后	封堵率/%
HPAM	0	115.7	12.1	89.5
	50 mL/min	123.6	25.8	79.1
	175 mL/min	102.3	62.2	39.2
DHAP	0	142	2.6	98.2
	50 mL/min	111.8	5.2	95.3
	175 mL/min	137.3	12.29	91.0

Evaluation of shear resistance of multi-crosslinked hydrogel system

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实验序号	聚合物类型	渗透率/ （×10³μm²）	水驱采收率/%	凝胶体系的采收率/%	后续水采收率/%	最终采收率/%	采收率提高/%
1	未剪切的HPAM	251	62.8	2.2	5.2	70.2	7.4
1	未剪切的HPAM	84	39.4	2.8	13.6	55.8	16.4
2	剪切后的HPAM	243	64.2	2.3	2.2	68.7	4.5
2	剪切后的HPAM	78	37.2	2.6	9.1	48.9	11.7
3	未剪切的DHAP	265	63.2	1.2	6.8	71.2	8
3	未剪切的DHAP	90	37.5	3.5	22.5	63.5	26
4	剪切后的DHAP	256	61.2	1.6	3.9	67.9	6.7
4	剪切后的DHAP	91	40.1	2.9	17.9	60.9	20.8

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