耐高温栲胶堵剂的研制及油藏适应性评价

doi:10.13809/j.cnki.cn32-1825/te.2021.03.022

Abstract

Abstract:

There are several problems in the high temperature resistant plugging agent used in steam flooding of heavy oil reservoirs to control steam channeling, such as low strength and poor long-term stability. So, it is urgent to develop a new type of high temperature resistant plugging agent to promote on-site application. In order to solve the technical problems caused by strong inter-layer heterogeneity of the heavy oil reservoirs in District 9-6 of Qigu Formation in Xinjiang Oilfield, including severe steam channeling and poor foam flooding effects, a plugging agent system suitable for high temperature reservoirs and composed of sulfonated tannin extract, cross-linking agent and accelerant has been developed. By the static evaluation experiment, it is found that the optimized formula of the plugging agent is as follows: 0.6 % sulfonated tannin extract + （2.0 % ~ 2.5 %） aldehyde cross-linking agent Ⅰ +（1.0 % ~ 2.0 %） phenol cross-linking agent Ⅱ +（0.05 % ~ 0.06 %） accelerant. The evaluation of reservoir adaptability shows that the strength of the plugging agent remains above level H after 30 days of aging at the reservoir temperature, and the plugging efficiency is above 94 %. It has laid a foundation for the field application of steam channeling control technologies in the heavy oil reservoirs of District 9-6 of Qigu Formation in Karamay Oilfield.

Key words: heavy oil reservoir, steam channeling, high temperature resistant plugging agent, sulfonated tannin extract, reservoir adaptability evaluation

CLC Number:

TE39

LIU Gang,WANG Junheng,WANG Danling,YAN Yonghe,JIANG Xuefeng,WANG Qian. Development and reservoir adaptability evaluation of a high temperature resistant plugging agent: tannin extract[J].Petroleum Reservoir Evaluation and Development, 2021, 11(3): 452-458.

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等级	状态描述	分类
A	凝胶黏度与初始聚合物溶液黏度相同, 目测未形成凝胶	无法成胶
B	凝胶黏度比初始聚合物黏度稍有增加	弱凝胶
C	倒置有明显的流动	弱凝胶
D	有少量凝胶不能快速流动	弱凝胶
E	凝胶不易流动	中等凝胶
F	凝胶只能在顶部小范围内流动	中等凝胶
G	凝胶流动大约下降一半	中等凝胶
H	倒置仅凝胶表面可轻微变形	强凝胶
I	倒置凝胶表面不变形	强凝胶

栲胶质量分数（%）	成胶时间（h）	成胶强度	栲胶质量分数（%）	成胶时间（h）	成胶强度
0.1			0.6	11.8	H
0.2			0.7	9.4	H
0.3	18.2	E	0.8	8.5	I
0.4	16.3	G	0.9	7.6	I
0.5	13.6	G	1.0	7.7	I

交联剂体积分数（%）	成胶时间（h）	成胶强度
0.5	17.9	F
1.0	15.6	G
1.5	12.4	G
2.0	11.5	H
2.5	9.5	I
3.0	7.9	I
3.5	7.3	F
4.0	6.5	D

交联剂体积分数（%）	成胶时间（h）	成胶强度
0	18.6	F
0.5	14.1	G
1.0	12.0	H
1.5	10.6	I
2.0	9.7	I
2.5	8.4	F
3.0	7.2	D

促进剂质量分数（%）	成胶时间（h）	成胶强度
0.01	17.9	F
0.02	15.6	F
0.03	13.3	G
0.04	12.5	G
0.05	11.7	H
0.06	9.8	H
0.07	9.2	H
0.08	8.4	I
0.09	7.6	I
0.10	7.1	I

Development and reservoir adaptability evaluation of a high temperature resistant plugging agent: tannin extract

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温度（℃）	成胶时间（h）	成胶强度	老化30 d后
25	未成胶	未成胶	未成胶
50	24.3	G	稳定
100	15.5	H	稳定
150	10.7	H	微量脱水

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pH值	成胶时间（h）	成胶强度
5	17.6	G
6	13.8	H
7	12.6	H
8	11.7	H
9	11.0	H
10	10.2	I
11	6.9	F

岩心编号	长度（cm）	直径（cm）	孔隙体积（cm³）	孔隙度（%）	水测渗透率（10^-3 μm²）
1#	50	2.54	81.8	32.3	1 726.1
2#	50	2.54	74.8	29.6	1 688.3

岩心编号	注入堵剂（PV）	封堵后水测渗透率（10^-3 μm²）	突破压力（MPa）	突破压力梯度（MPa/m）	封堵率（%）
1#	0.5	101.8	1.98	3.46	94.1
2#	0.5	87.8	1.73	3.96	94.8