页岩油藏“密切割”体积改造产能影响因素分析

doi:10.11885/j.issn.1674-5086.2019.12.30.02

西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (3): 132-143.DOI: 10.11885/j.issn.1674-5086.2019.12.30.02

页岩油藏“密切割”体积改造产能影响因素分析

于学亮¹, 胥云¹, 翁定为¹, 蒋豪², 段瑶瑶¹

1. 中国石油勘探开发研究院压裂酸化技术服务中心, 北京海淀 100083;
2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2019-12-30 出版日期:2020-06-10 发布日期:2020-06-10
通讯作者: 于学亮,E-mail:xueliang.yu@jciem.com
作者简介:于学亮,1990年生,男,汉族,山东德州人,硕士,主要从事油气增产改造技术研究。E-mail:xueliang.yu@jciem.com;胥云,1961年生,男,汉族,重庆大足人,教授级高级工程师,主要从事油气藏压裂酸化基础理论、技术方法与现场应用等方面的研究工作。E-mail:xuyun69@petrochina.com.cn;翁定为,1981年生,男,汉族,湖北枝江人,高级工程师,主要从事压裂工艺方面的研究工作。E-mail:wendw69@petrochina.com.cn;蒋豪,1991年生,男,汉族,四川成都人,博士研究生,主要从事油气增产改造技术研究。E-mail:Jhao27@qq.com;段瑶瑶,1983年生,女,汉族,河南邓州人,工程师,主要从事致密气藏储层改造研究工作。E-mail:dyy198311@163.com
基金资助:
国家科技重大专项（2016ZX05023；2017ZX05013-005）

Factors Influencing the Productivity of the Multi-fractured Shale Oil Reservoir with Tighter Clusters

YU Xueliang¹, XU Yun¹, WENG Dingwei¹, JIANG Hao², DUAN Yaoyao¹

1. Research Institute of Petroleum Exploration&Development of Petrochina, Haidian, Beijing 100083, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2019-12-30 Online:2020-06-10 Published:2020-06-10

摘要/Abstract

摘要： 密切割"水平井体积改造是开发页岩油藏的有效手段，裂缝间距和井距是"密切割"水平井体积改造设计的关键环节。基于Comsol建立了离散裂缝网络数值模型，对"密切割"体积改造油藏进行仿真模拟，研究了裂缝间距、井距、裂缝复杂程度对增产效果的影响。结果表明，针对目标油藏，裂缝间距由30 m缩短至10 m，单井累计产量可提高到原来的1.63倍；布置加密井，将井距从400 m缩短至200 m，目标储层年产量可提高51.17%；生产初期，复杂缝单井比简单缝单井90 d累计产量高39.80%。鉴于人工裂缝呈现非均匀充填的特征，采用等效加密方法表征的裂缝无法反映这一特点，研究了远端无支撑裂缝对改造效果的影响，发现远端无支撑裂缝对单井年产量的影响可达4.38%。"密切割"水力压裂矿场试验显示，采用细分切割的方法缩小裂缝间距，能够有效地提高油井产能，单井年产油可提高79.70%。

关键词: 页岩油藏, 体积改造, 产能分析, 水力裂缝, 非均匀充填

Abstract: The multi-fracturing horizontal well with tighter clusters is an effective means of developing shale oil reservoirs. Fracture spacing and well spacing are key parameters in the tight cluster hydraulic fracturing design. A discrete fracture network numerical model based on Comsol software is established, simulating multi-fractured reservoir with tighter clusters. The effects of fracture spacing, well spacing and fracture complexity on the stimulation effectiveness are discussed. The results show that, for the target reservoir, the cumulative production of a single well can increase to about 1.63 times by decreasing fracture spacing from 30 m to 10 m. The cumulative production of the target reservoir can increase about 51.17% by decreasing the well spacing from 400 m to 200 m. The 90 d cumulative production of a single well with complex fracture is 39.80% higher than that with simple rectangular fracture. Tight cluster hydraulic fracturing field experiments show that artificial fractures have non-uniform filling characteristics. Fractures characterized by equivalent refining methods can't reflect such characteristics. Therefore, the effects of the remote unpropped fracture on the stimulation effectiveness are also discussed. The effects of the remote unpropped fracture on the annual cumulative production of a single is about 4.38%. Field experiment shows that the multi-fractured horizontal well with tighter clusters could improve the single well production effectively by 79.70%.

Key words: shale oil reservoir, multi-fracturing, productivity analysis, hydraulic fracture, non-uniform filling

中图分类号:

TE319

于学亮, 胥云, 翁定为, 蒋豪, 段瑶瑶. 页岩油藏“密切割”体积改造产能影响因素分析[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 132-143.

YU Xueliang, XU Yun, WENG Dingwei, JIANG Hao, DUAN Yaoyao. Factors Influencing the Productivity of the Multi-fractured Shale Oil Reservoir with Tighter Clusters[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 132-143.

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页岩油藏“密切割”体积改造产能影响因素分析

Factors Influencing the Productivity of the Multi-fractured Shale Oil Reservoir with Tighter Clusters

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