渤海J油田高含水后期压裂井选井选层研究及应用

doi:10.13809/j.cnki.cn32-1825/te.2021.05.011

摘要/Abstract

摘要：

针对海上聚驱油田高含水后期剩余油分布复杂及油井压裂选井、选层难度大等问题,综合运用改进后的无因次产液指数计算方法评价油井产液能力,分析了聚驱后油井合理产液变化规律,进而选择无因次产液指数下降幅度大于30 %的亟须治理的油井;结合储层精细分析、剩余油精细刻画,进行了高含水后期油藏驱替倍数量化表征和分级评价,有效量化了各层的剩余潜力,建立了渤海J油田高含水后期压裂措施的合理选井、选层的方法和量化依据,保障了海上压裂技术的增油效果。矿场实践表明,该技术方法合理有效,压裂措施实施后单井日增油可达14~42 t,增油效果显著,可为类似处于高含水后期的油田的压裂措施选择及产能改造潜力评价提供借鉴。

关键词: 压裂, 高含水后期, 选井选层, 聚合物驱, 渤海

Abstract:

After the long-term water and polymer flooding, the remaining oil distribution in the late stage of high water cut is complex, and it is difficult to select fracturing wells and layers. In order to solve these problems, an improved calculation method of the dimensionless liquid production index for wells in polymer flooding oilfields is proposed to evaluate the production capability and changes, then the wells that the dimensionless liquid production index dropped more than 30 % are selected. At the same time, combined with the fine geology and reservoir analysis, the quantitative characterization of displacement multiple in the late stage of high water cut is studied and the remaining oil for each layer is evaluated. At last, the method of selecting fracturing well and layer in Bohai J Oil Field is established. Field applications showed that this method was reasonable and effective, the oil production incremental for each well after fracturing is about 14 to 42 tons. It can also provide reference for the selection of fracturing measures and the evaluation of well stimulation potential of similar oilfields in the late stage of high water cut.

Key words: fracturing, late stage of high water cut, well and layer selection, polymer flooding, Bohai

中图分类号:

TE345

闫建丽,颜冠山,谷志猛,别梦君,张振杰. 渤海J油田高含水后期压裂井选井选层研究及应用[J]. 油气藏评价与开发, 2021, 11(5): 736-743.

YAN Jianli,YAN Guanshan,GU Zhimeng,BIE Mengjun,ZHANG Zhenjie. Selection of fracturing wells and layers of Bohai J Oil Field in the late stage of high water cut and its application[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 736-743.

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井号	含水率（%）	生产压差（MPa）	无因次产液指数（注聚后）			分类
井号	含水率（%）	生产压差（MPa）	理论值	实际值	下降幅度（%）	分类
W9-6井	81	7.9	2.21	0.79	64	三类井
E1-2井	86	6.4	3.02	1.28	58	三类井
E2-3井	91	6.5	3.24	1.67	48	三类井
E2-7井	91	5.5	4.65	2.58	45	三类井
E1-3井	90	5.6	4.02	3.53	12	二类井
E1-4井	89	5.8	3.78	3.54	6	一类井
E3-4井	84	5.3	2.45	2.37	3	一类井

区间	驱替倍数	采出程度增幅（%）	分类	分布区域
①	<5	24~35	弱驱替区	注采分流线、井网不完善区,过水量较小
②	5~20	10~18	强驱替区	注采主流线,过水量较大
③	20~50	5~10	高耗水区	储层物性较好、优势通道
④	>50	2~5	无效注水区	累积产油量和累积注水量较高的油水井附近、大孔道

砂体类型	分布形态	相邻砂体类型	剩余油类型	油层厚度（m）	地层压力状况	驱替倍数	剩余可采储量（10⁴ t）	注水受效方向（个）	上下隔层情况
分流河道砂	窄条带状	河口坝或非主体薄层砂	井网控制程度低	压裂段内有三个及以上有效厚度≥1.5 m 的油层	推荐地层压力系数大于0.75	<5	1.8	≥1	具备良好的上下隔层
河口坝	分布范围广、连片发育	非主体薄层砂	注采不完善型				1.2	≥2
非主体薄层砂	席状	非主体薄层砂	层间干扰型				0.8	≥2

井号	压裂前		压裂层位	压裂后（3个月平均）		平均单井日增油（t）
井号	日产油（t）	含水率（%）	压裂层位	日产油（t）	含水率（%）	平均单井日增油（t）
W9-6井	4.7	81	Ⅰ油组	18.7	79	14.0
E1-2井	29.0	86	Ⅱ、Ⅲ油组	71.1	87	42.1
E2-3井	18.7	91	Ⅰ、Ⅱ油组	43.0	92	24.3
E2-7井	6.5	91	Ⅱ、Ⅲ油组	32.7	90	26.2
平均	14.7	89		41.4	89	26.7