致密砂岩水平井组同步压裂过程中诱导应力场变化规律

陈作; 周健; 张旭; 吴春方; 张啸宇

doi:10.11911/syztjs.201606013

致密砂岩水平井组同步压裂过程中诱导应力场变化规律

doi: 10.11911/syztjs.201606013

1.
中国石化石油工程技术研究院, 北京 100101;
2.
中国石油大学(北京)研究生院, 北京 102249

基金项目:

中国石化科技攻关项目“致密砂岩水平井组分段压裂优化设计技术研究”（编号：P13001）部分研究内容。

详细信息

作者简介:
陈作(1968-),男,四川蓬溪人,1991年毕业于西南石油学院油藏工程专业,2002年获中国地质大学(北京)石油与天然气工程专业硕士学位,教授级高级工程师,主要从事非常规油气藏压裂酸化改造方面的研究。

中图分类号: TE357.1⁺1
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出版历程
- 收稿日期: 2016-07-12
- 修回日期: 2016-10-10
- 刊出日期: 1900-01-01

The Principle of Induced Stress Change Caused by Multi-Wells and Multi-Fractures during Synchronous Fracturing of Cluster Horizontal Wells in Tight Sandstone Gas Reservoirs

1.
Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China;
2.
Graduate School, China University of Petroleum(Beijing), Beijing, 102249, China

摘要

摘要: 水平井组同步压裂过程中多井多裂缝导致的诱导应力对压裂设计、复杂裂缝的形成有重要影响，但目前对诱导应力场变化规律的研究相对较少。为此，建立了双井多缝诱导应力场数学模型，并利用线性叠加原理和矢量表征方法，得到了不同裂缝参数及井距时两井中间位置处诱导应力场的变化规律。研究发现，布缝方式、裂缝宽度、裂缝长度和井距对诱导应力场的影响程度各不相同：诱导应力场对裂缝长度与井距的变化最为敏感；相邻两井中间位置处产生的诱导应力最大，井筒井壁位置产生的应力最小，欲使压裂裂缝转向形成复杂裂缝系统，需要布缝方式、裂缝长度、裂缝宽度与井距相互匹配。大牛地气田DP43井组现场井下微地震监测结果证实了上述研究成果，从而也解释了水平井组拉链式布缝同步压裂可以获得高产的原因。水平井组诱导应力场变化规律的清楚认识，为致密砂岩水平井组合理设置井距与优化压裂设计方案提供了依据。
- 水平井组 /
- 同步压裂 /
- 诱导应力 /
- 裂缝参数 /
- 裂缝监测
Abstract: During synchronous fracturing of horizontal well clusterd, the induced stresses generated by multiple wells and fractures may significantly affect fracturing design and the formation of complex fractures. Few studies have been conducted related to patterns of changes in induced stress fields. In the study that concerns itself with this topic, the mathematic model for the horizontal stress field between wells was constructed. By using linear superposition and vector representation, patterns of changes in induced stress fields between two wells at different fracture parameters and well spacing were highlighted. Research results demonstrated variable impact based on factors on induced stress field. To be more specific, the induced stress fields were extremely sensitive to changes in fracture lengths and well spacing. The maximum induced stress could be observed at the central point between two neighboring wells, whereas the minimum stress could be observed at the sidewalls. To divert fractures to generate complicated fracture systems, it was necessary to establish suitable matching among fracturing techniques, fracture length, width and well spacing. Underground micro-seismic monitoring results in Daniudi DP43 well cluster verified accuracy of above research results. In addition, these results might also provide an acceptable explanation for the high productivity of synchronous fracturing operations in zippered fractures of horizontal well clusters. Generally speaking, a clear understanding of changes in induced stress fields in horizontal clusters might provide a reliable foundation for the determination of optimal well spacing and a fracturing program for horizontal well clusters to develop tight sandstone formations.
- horizontal well cluster /
- synchronous fracturing /
- induced stress /
- fracture parameter /
- fracture monitoring

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参考文献(16)

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致密砂岩水平井组同步压裂过程中诱导应力场变化规律

doi: 10.11911/syztjs.201606013

作者简介: 陈作(1968-),男,四川蓬溪人,1991年毕业于西南石油学院油藏工程专业,2002年获中国地质大学(北京)石油与天然气工程专业硕士学位,教授级高级工程师,主要从事非常规油气藏压裂酸化改造方面的研究。

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The Principle of Induced Stress Change Caused by Multi-Wells and Multi-Fractures during Synchronous Fracturing of Cluster Horizontal Wells in Tight Sandstone Gas Reservoirs

计量

出版历程

目录

作者简介:
陈作(1968-),男,四川蓬溪人,1991年毕业于西南石油学院油藏工程专业,2002年获中国地质大学(北京)石油与天然气工程专业硕士学位,教授级高级工程师,主要从事非常规油气藏压裂酸化改造方面的研究。