大庆油田二类B油层聚驱剖面动用规律及其改善

doi:10.7657/XJPG20240508

摘要/Abstract

摘要：

大庆油田聚合物驱应用规模不断扩大，开发对象转向性质较差的二类B油层，现有聚合物与油层适应性不强，剖面动用规律不明确，不同地区聚驱开发效果差异较大。针对上述问题，应用矿场剖面数据统计和室内实验分析，研究了二类B油层剖面动用规律和剖面改善方法。结果表明：从吸水层动用情况来看，喇嘛甸地区由于发育厚层河道砂，油层物性好，油层有效厚度动用比例最高，油层以多次动用为主，突进层多，相对吸液量高；萨中和萨南地区河道砂发育规模小，薄砂层较多，物性差，有效厚度动用比例较低，但聚驱后，有效厚度动用比例相比水驱分别增大了12.5%和15.4%，渗透率为100~300 mD的储集层吸入剖面改善明显；从未吸水层动用来看，二类B油层纵向非均质性强，导致层间有效厚度未动用比例较高，剖面改善应以均衡层间动用为主；抗盐聚合物高、低质量浓度交替注入可延缓含水率上升时间，增加低渗透层吸液量，聚驱采出程度提高显著。在喇嘛甸北北块A区开展了DS1200抗盐聚合物和高、低质量浓度交替注入试验，降水增油效果好，可为大庆油田二类B油层聚驱剖面改善提供技术指导。

关键词: 大庆油田, 二类B油层, 聚合物驱, 吸水剖面, 驱油实验, 抗盐聚合物

Abstract:

The application of polymer flooding is expanding in Daqing oilfield, with the target transferring to poor-quality Class ⅡB reservoir. The existing polymers exhibit poor compatibility with the reservoir, the producing patterns of the profile remain unclear, and the effects of polymer flooding development vary greatly in different areas. To address these issues, through the analysis of field profile data statistics and laboratory experiments, the producing patterns and improvement methods for the profiles in Class ⅡB reservoir were investigated. In view of the producing status from water-injected layers, Lamadian area which is characterized by thick channel sandbodies and good reservoir properties exhibits the highest proportion of net pay producing, with the reservoir exploited frequently, multiple polymer breakthrough layers, and relatively high liquid absorption. The Sazhong and Sanan areas, with limited channel sandbodies and multiple thin sand layers with poor properties, show a low net pay producing proportion in the water flooding stage, after polymer flooding which is 12.5% and 15.4% higher than those in the water flooding stage, respectively. Additionally, the reservoirs with permeability ranging from 100 to 300 mD show a significant profile improvement. In view of the producing status of water-unswept layers, the strong vertical heterogeneity of Class ⅡB reservoir results in a high net pay unproducing proportion between layers. In this case, the profile should be improved by achieving balanced interlayer production. The alternating injection of salt-resistant polymer of high and low concentrations can delay the rise of water cut, enhance the liquid absorption in low-permeability layers, and significantly improve the recovery efficiency of polymer flooding. A pilot test on alternating injection of DS1200 salt-resistant polymer of high and low concentrations was conducted in A area of Beibei block in Lamadian, achieving satisfactory water-cut reduction and oil increment. This technology provides a guidance for improving the polymer flooding profiles of Class ⅡB reservoir in Daqing oilfield.

Key words: Daqing oilfield, Class ⅡB reservoir, polymer flooding, water injection profile, oil displacement experiment, salt-resistant polymer

中图分类号:

TE357.431

周丛丛, 曹瑞波, 孙洪国, 樊宇, 郭松林, 梁国良. 大庆油田二类B油层聚驱剖面动用规律及其改善[J]. 新疆石油地质, 2024, 45(5): 567-573.

ZHOU Congcong, CAO Ruibo, SUN Hongguo, FAN Yu, GUO Songlin, LIANG Guoliang. Producing Patterns and Improvement of Polymer Flooding Profile in Class ⅡB Reservoir, Daqing Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(5): 567-573.

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参考文献 20

[1]	张冶, 程毅. 大庆喇嘛甸油田聚驱后压堵驱剩余潜力挖潜可行性[J]. 大庆石油地质与开发, 2022, 41(6):109-116.
	ZHANG Ye, CHENG Yi. Feasibility of fracturing-plugging flooding to tap remaining potential after polymer flooding in Lamadian oilfield in Daqing[J]. Petroleum Geology & Oilfield Development in Daqing, 2022, 41(6):109-116.
[2]	牛金刚. 大庆油田聚合物驱提高采收率技术的实践与认识[J]. 大庆石油地质与开发, 2004, 23(5):91-93.
	NIU Jingang. Practice and understanding of polymer flooding enhanced oil recovery technology in Daqing oilfield[J]. Petroleum Geology & Oilfield Development in Daqing, 2004, 23(5):91-93.
[3]	王德民, 程杰成, 吴军政, 等. 聚合物驱油技术在大庆油田的应用[J]. 石油学报, 2005, 26(1):74-78. doi: 10.7623/syxb200501015
	WANG Demin, CHENG Jiecheng, WU Junzheng, et al. Application of polymer flooding technology in Daqing oilfield[J]. Acta Petrolei Sinica, 2005, 26(1):74-78. doi: 10.7623/syxb200501015
[4]	张卓, 王正欣, 薛国勤, 等. 中高渗胶结油藏聚合物驱后非均相复合驱技术[J]. 新疆石油地质, 2021, 42(4):475-479.
	ZHANG Zhuo, WANG Zhengxin, XUE Guoqin, et al. Heterogeneous compound flooding technology for medium-high permeability consolidated reservoir after polymer flooding[J]. Xinjiang Petroleum Geology, 2021, 42(4):475-479.
[5]	张铜耀, 陈科, 刘泠杉, 等. 利用微流控技术评价聚合物与储层岩石相互作用[J]. 大庆石油地质与开发, 2022, 41(1):111-117.
	ZHANG Tongyao, CHEN Ke, LIU Lingshan, et al. Interaction between polymer and reservoir rock evaluated by microfluidic technology[J]. Petroleum Geology & Oilfield Development in Daqing, 2022, 41(1):111-117.
[6]	陈玲玲. 聚合物凝胶调剖剂运移特性及封堵效果[J]. 大庆石油地质与开发, 2022, 41(4):122-130.
	CHEN Lingling. Evaluation of the migration characteristics and plugged effects of polymer-gel profile-control agent[J]. Petroleum Geology & Oilfield Development in Daqing, 2022, 41(4):122-130.
[7]	李宜强, 苏伟明, 王争进, 等. 二类油层不同注采类型井组聚驱最佳调整时机[J]. 石油学报, 2012, 33(4):647-652. doi: 10.7623/syxb201204015
	LI Yiqiang, SU Weiming, WANG Zhengjin, et al. The optimal adjustment moment of polymer flooding for different injection-production types in Class Ⅱ oil layers[J]. Acta Petrolei Sinica, 2012, 33(4):647-652.
[8]	周丛丛. 聚驱油层注采连通类型判别及开发对策[J]. 石油地质与工程, 2023, 37(6):57-62.
	ZHOU Congcong. Identification of injection-production connectivity types and development strategies for polymer flooding reservoirs[J]. Petroleum Geology & Engineering, 2023, 37(6):57-62.
[9]	王桂芳, 王硕亮, 许学健, 等. KS油田高含水后期调剖堵水选井[J]. 新疆石油地质, 2022, 43(1):122-126.
	WANG Guifang, WANG Shuoliang, XU Xuejian, et al. Selection of wells for profile control and water plugging in late high-water cut stage in KS oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(1):122-126.
[10]	苏旭. 聚合物驱多参数数值模拟自动历史拟合方法[J]. 油气地质与采收率, 2022, 29(5):102-110.
	SU Xu. Automatic history matching method for multi-parameter numerical simulation of polymer flooding[J]. Petroleum Geology and Recovery Efficiency, 2022, 29(5):102-110.
[11]	杨晶, 朱焱, 李建冰, 等. 聚合物驱剖面返转时机及其影响因素[J]. 油田化学, 2016, 33(3):472-476.
	YANG Jing, ZHU Yan, LI Jianbing, et al. Influence factors of profile reversal opportunity during polymer flooding[J]. Oilfield Chemistry, 2016, 33(3):472-476.
[12]	俞欢, 周智, 吴方之, 等. 聚合物驱剖面返转影响因素研究[J]. 辽宁化工, 2015, 44(11):1404-1406.
	YU Huan, ZHOU Zhi, WU Fangzhi, et al. Research on influence factors of section inversion of polymer flooding[J]. Liaoning Chemical Industry, 2015, 44(11):1404-1406.
[13]	曹瑞波, 高倩. 聚合物驱交替注入改善吸液剖面的力学机制及效果评价方法[J]. 实验力学, 2016, 31(2):231-237.
	CAO Ruibo, GAO Qian. On the mechanics and evaluation method in fluid absorption profile improvement of polymer flooding alternate injection[J]. Journal of Experimental Mechanics, 2016, 31(2):231-237.
[14]	吴昊镪, 彭小龙, 朱苏阳, 等. 砾岩油藏弓形井多级水平缝压裂聚驱采收率数值模拟[J]. 新疆石油地质, 2022, 43(1):85-91.
	WU Haoqiang, PENG Xiaolong, ZHU Suyang, et al. Numerical simulation on polymer flooding recovery of conglomerate reservoird:Horizontal fractures in arched wells after multi-stage fraturing[J]. Xinjiang Petroleum Geology, 2022, 43(1):85-91.
[15]	侯维虹. 聚合物驱油层吸水剖面变化规律[J]. 石油勘探与开发, 2007, 34(4):478-482.
	HOU Weihong. Water injection profile variation of oil layers under polymer flooding[J]. Petroleum Exploration and Development, 2007, 34(4):478-482.
[16]	徐新霞. 聚合物驱“吸液剖面反转”现象机理研究[J]. 特种油气藏, 2010, 17(2):101-104.
	XU Xinxia. Research on the mechanism of “fluid entry profile reverse”during polymer flooding[J]. Special Oil & Gas Reservoirs, 2010, 17(2):101-104.
[17]	王凤娇, 徐贺, 刘义坤, 等. 浅薄层普通稠油油藏聚合物驱提高采收率研究与应用[J]. 特种油气藏, 2023, 30(1):107-113. doi: 10.3969/j.issn.1006-6535.2023.01.015
	WANG Fengjiao, XU He, LIU Yikun, et al. Study and application of polymer flooding for enhanced oil recovery in shallow ordinary heavy oil reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(1):107-113.
[18]	王冬梅, 韩大匡, 侯维虹, 等. 聚合物驱剖面返转类型及变化规律[J]. 大庆石油地质与开发, 2007, 26(4):96-99.
	WANG Dongmei, HAN Dakuang, HOU Weihong, et al. Types and changing laws of profile reversal during polymer flooding[J]. Petroleum Geology & Oilfield Development in Daqing, 2007, 26(4):96-99.
[19]	杨森, 舒政, 赖南君, 等. 不同浓度聚合物段塞交替注入提高采收率技术[J]. 西安石油大学学报(自然科学版), 2021, 36(2):57-62.
	YANG Sen, SHU Zheng, LAI Nanjun, et al. Enhancing oil recovery by alternative injection of polymer slugs with different concentrations[J]. Journal of Xi’an Shiyou University(Natural Science Edition), 2021, 36(2):57-62.
[20]	周丛丛, 李勃, 孙洪国, 等. 大庆油田二类B油层DS1200新型聚合物合成与评价[J]. 大庆石油地质与开发, 2023, 42(5):116-122.
	ZHOU Congcong, LI Bo, SUN Hongguo, et al. Synthesis and evaluation of new polymer DS1200 for Class ⅡB reservoir in Daqing oilfield[J]. Petroleum Geology & Oilfield Development in Daqing, 2023, 42(5):116-122.

油层类型	主要判定参数				辅助判定参数
油层类型	沉积相	砂体沉积类型	砂体钻遇率/%	单层碾平有效厚度/m	油层总钻遇率/ %	（表外钻遇率/ 油层总钻遇率/） %	有效渗透率/ mD
二类 A油层	泛滥平原	分流河道砂	≥30	≥1.0	≥80	≤20	≥0.3
	分流平原	厚层席状砂及分流河道砂	≥50		≥80	≤20	≥0.3
	内前缘	水下分流河道砂	≥20		≥80	≤30	≥0.1
		席状砂	≥30
		厚层席状砂及分流河道砂	≥40
二类 B油层	泛滥平原	分流河道砂	≥20	≥0.5	≥60	≤20	0.1~0.3
	分流平原	厚层席状砂及分流河道砂	≥40		≥60	≤20
	内前缘	席状砂及河分流道砂	≥60		≥80	≤30
	内前缘	薄层席状砂	≤25		≥80	≤30

地区	有效厚度动用比例			相对吸液量
地区	水驱	聚驱初期	聚驱平均	水驱	聚驱初期	聚驱平均
喇嘛甸	26.3	29.2	24.6	41.0	53.5	47.6
萨中	17.0	19.8	18.0	41.4	39.6	39.0
萨南	10.5	6.1	5.6	31.5	17.6	18.6

分布位置	地区	有效厚度未动用比例
分布位置	地区	水驱	聚驱第1年	聚驱第2年	聚驱第3年	聚驱第4年
层间	喇嘛甸	9.1	9.7	6.8	12.4	10.8
	萨中	23.3	28.4	32.6	20.0	21.9
	萨南	21.1	26.2	18.6	36.8	31.6
层内	喇嘛甸	14.8	12.1	14.1	16.9	9.7
	萨中	21.6	17.9	12.9	13.9	8.5
	萨南	14.4	10.3	10.6	3.5	1.9

聚合物及注入方式	质量浓度/ （mg·L^-1）	黏度/ （mPa·s）	有效渗透率/mD	含油饱和度/%	水驱采出程度/%	聚驱采出程度/%	采收率/ %
普通聚合物并联笼统注入	1 600	46.9	274	74.7	48.6	13.3	61.9
普通聚合物并联笼统注入	1 600	46.9	118	75.0	45.6	18.0	63.6
DS1200抗盐聚合物并联笼统注入	1 500	47.1	296	75.3	49.1	13.5	62.6
DS1200抗盐聚合物并联笼统注入	1 500	47.1	135	74.7	47.0	23.5	70.5
DS1200抗盐聚合物并联、高低质量浓度注入	1 800	62.2	285	74.5	46.8	14.4	61.2
DS1200抗盐聚合物并联、高低质量浓度注入	1 200	33.9	140	72.6	47.7	27.9	75.6

试验井区	注入井/口	采油井/口	砂岩厚度/m	有效厚度/m	渗透率/mD	试验方案
喇AS井区	8	15	15.8	11.3	459	DS1200抗盐聚合物笼统注入，质量浓度为1 700 mg/L
喇PS井区	6	10	18.1	12.7	467	普通聚合物高、低质量浓度交替注入，质量浓度分别为 2 200 mg/L和1 300 mg/L，交替周期为3个月