低渗透油藏驱油用缔合聚合物的合成及其油藏适应性研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.004

油气藏评价与开发 ›› 2020, Vol. 10 ›› Issue (6): 24-32.doi: 10.13809/j.cnki.cn32-1825/te.2020.06.004

低渗透油藏驱油用缔合聚合物的合成及其油藏适应性研究

李华兵¹(),李建霆²,李文宏³,胡俊¹,袁国伟³,梁严^4,⁵,张新民^1,⁴,郭拥军^1,^4,⁵()

1.四川光亚聚合物化工有限公司,四川南充 637900
2.中国石油长庆油田分公司第二采油厂,甘肃庆城 745100
3.长庆油田分公司勘探开发研究院,陕西西安 710018
4.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500
5.西南石油大学化学化工学院,四川成都 610500

收稿日期:2020-11-03 出版日期:2020-12-26 发布日期:2021-01-07
通讯作者: 郭拥军 E-mail:gyfzlhb@126.com;gyfzgyj@126.com
作者简介:李华兵（1984—）,男,本科,工程师,从事油田功能化学剂研发及化学驱提高采收率技术研究工作。地址：四川省南充市嘉陵区南充创业小镇B座,邮政编码：637900。E-mail: gyfzlhb@126.com
基金资助:
中国石油天然气股份有限公司重大科技专项“长庆油田5 000万吨持续高效稳产关键技术研究与应用”(2016E-05)

Synthesis of associative polymer for flooding in low permeability reservoir and its reservoir adaptability

LI Huabing¹(),LI Jianting²,LI Wenhong³,HU Jun¹,YUAN Guowei³,LIANG Yan^4,⁵,ZHANG Xinmin^1,⁴,GUO Yongjun^1,^4,⁵()

1.Sichuan Guangya Polymer Chemical Co., Ltd., Nanchong, Sichuan 637900, China
2.No.2 Oil Production Plant, PCOC, Qingcheng, Gansu 745100, China
3.Exploration and Development Research Institute, Changqing Oilfield Branch Company, PetroChina, Xi’an, Shaanxi 710018, China
4.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
5.College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2020-11-03 Online:2020-12-26 Published:2021-01-07
Contact: GUO Yongjun E-mail:gyfzlhb@126.com;gyfzgyj@126.com

摘要/Abstract

摘要：

针对长庆油田某区块中温高矿化度低渗透的油藏条件,设计合成了不同十二烷基烯丙基二溴化四甲基乙二铵（TDAD）含量的耐温抗盐型低相对分子质量（720.42×10⁴ ~ 982.55×10⁴）疏水缔合聚合物（HAWSP系列）,通过红外光谱确认了聚合物分子结构,在该区块条件下考察了HAWSP系列的溶液性能和应用性能适应性,并在该区块现场开展矿场验证试验。结果表明,与抗盐部分水解聚丙烯酰胺HPAM相比,HAWSP系列具有更优的增黏性和相当的老化稳定性（60 d老化黏度保留率大于85 %）;在气测渗透率为50×10^-3 μm²的油藏条件下,缔合聚合物HAWSP-850在兼具良好注入性和传导性时,还能在4倍渗透率极差（低渗为25×10^-3 μm²）的非均质岩心中有更强的波及能力,可多提高采收率3.29个百分点。矿场试验表明,耐温抗盐低相对分子质量缔合聚合物的现场适应性较好,相比常规聚丙烯酰胺驱油体系,具有明显的降压增注提高采收率效果,在低渗油藏化学驱中具有重要的推广意义。

关键词: 低渗透, 低相对分子质量, 缔合聚合物, 油藏适应性, 矿场试验

Abstract:

In view of the reservoir conditions in a block of Changqing Oilfield with medium temperature, high salinity and low permeability, different temperature-salt resistant associative polymers（HAWSP series） with low relative molecular weight（720.42×10⁴ ~ 982.55×10⁴） and different contents of dodecylallyl tetramethyl ethylene diammonium bromide（TDAD） have been designed and synthesized. Then the molecular structure of the polymer has been confirmed by infrared spectroscopy. Under the conditions of this block, the reservoir adaptability of HAWSP series involving solution properties and application performance have been studied, and the field test has been carried out in this block. The results show that, compared with the salt-resistant partially hydrolyzed polyacrylamide（HPAM）, HAWSP series has better thickening capacity and similar aging stability（viscosity retention rate is greater than 85 % after aging for 60 days）. When the gas permeability is of 50×10^-3 μm², the associative polymer HAWSP-850 not only exhibits good injectability and conductivity, but also could present stronger sweeping ability in heterogeneous core with a permeability contrast of 4 times（low permeability is of 25×10^-3 μm²）, which can enhance the oil recovery by another 3.29 percentage points. Field tests show that the temperature-salt resistant associative polymer has better field adaptability. Compared with the conventional HPAM flooding system, it has a significant effect of reducing pressure and improving injection capacity and oil recovery. Associative polymer has important promotion significance of chemical flooding in low permeability reservoirs.

Key words: low permeability, low molecular weight, associative polymer, reservoir adaptability, field test

中图分类号:

TE357

李华兵,李建霆,李文宏,胡俊,袁国伟,梁严,张新民,郭拥军. 低渗透油藏驱油用缔合聚合物的合成及其油藏适应性研究[J]. 油气藏评价与开发, 2020, 10(6): 24-32.

LI Huabing,LI Jianting,LI Wenhong,HU Jun,YUAN Guowei,LIANG Yan,ZHANG Xinmin,GUO Yongjun. Synthesis of associative polymer for flooding in low permeability reservoir and its reservoir adaptability[J]. Reservoir Evaluation and Development, 2020, 10(6): 24-32.

图/表 15

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聚合物	疏水单体质量分数/%	相对分子质量/10⁴	水解度/ %	FR_{3 μm}
HAWSP-950	0.6	982.55	23.48	1.08
HAWSP-850	0.9	852.65	23.52	1.05
HAWSP-750	1.2	720.42	23.76	1.03
HPAM-1500	0	1 485.34	24.85	1.03

聚合物	气测渗透率/10^-3 μm²	水测渗透率/10^-3 μm²	孔隙度/ %	初始黏度/ （mPa·s）	黏度保留率/ %	压力平稳时注聚量（PV）	阻力系数	残余阻力系数
HAWSP-950	50	10.9	11.3	37.3	60.2	10.6	84.0	34.0
HAWSP-850	50	11.3	11.9	33.4	84.2	4.8	41.8	12.8
HAWSP-750	50	11.8	12.5	31.3	88.5	2.6	17.9	1.4
HPAM-1500	50	10.2	12.1	29.3	73.9	4.2	30.3	4.3

聚合物	黏度/（mPa·s）	孔隙度/ %	含油饱和度/ %	水测渗透率/10^-3 μm²	前水驱采收率/ %	采收率提高百分点
HAWSP-850	33.4	15.8	64.3	13.2	27.4	13.59
HPAM-1500	29.3	16.3	65.1	13.9	26.9	10.30

序号	井号	注缔合聚合物前			注缔合聚合物后			变化
序号	井号	时间	油压/MPa	日注水量/m³	时间	油压/MPa	日注水量/ m³	油压/MPa	日注水量/ m³
1	M-H4-1	201906	18.2	25.7	202004	18.0	26	-0.2	0.3
2	M-H4-2	201906	18.4	21.4	202004	18.5	31	0.1	9.6
3	M-H4-3	201906	18.8	18.3	202004	18.2	25	-0.6	6.7
4	M-H6-1	201906	17.0	23.2	202004	15.6	30	-1.4	6.8
5	M-H6-2	201906	16.4	29.3	202004	16.5	32	0.1	2.7
6	M-H6-3	201906	17.8	21.8	202004	16.6	25	-1.2	3.2
7	M-H8-2	201906	19.8	26.5	202004	18.6	25	-1.2	-1.5
8	MJ-15-10	201906	19.1	20.3	202004	17.4	22	-1.7	1.7

井号	注缔合聚合物前			注缔合聚合物后			2019年6月增油量/t	2020年4月增油量/t
井号	产液量/（m³·d^-1）	产油量/（t·d^-1）	含水率/%	产液量/（m³·d^-1）	产油量/（t·d^-1）	含水率/%	2019年6月增油量/t	2020年4月增油量/t
M-H5-1	4.73	0.43	89.2	26.77	1.40	93.8	242.0	546.3
M-H5-2	16.45	0.63	95.5	24.43	1.32	93.7	119.0	289.8
MJ-H5-3	18.91	0.38	97.6	16.40	1.10	93.5	57.2	128.5
M-H9-3	16.30	0.61	95.6	28.93	1.50	93.9	226.0	312.1
MJ-13-8	10.86	1.16	87.5	14.16	2.77	77.0	437.0	807.1
M-H3-4	15.06	0.26	97.9	17.95	1.08	92.9	281.9	489.1
MJ-103	16.43	0.53	96.2	16.70	1.00	94.1	43.6	101.9
合计							1 406.6	2 674.9

低渗透油藏驱油用缔合聚合物的合成及其油藏适应性研究

Synthesis of associative polymer for flooding in low permeability reservoir and its reservoir adaptability

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