油气田开发

致密油水平井注采储集层四维地应力演化规律—以鄂尔多斯盆地元284区块为例

  • 朱海燕 ,
  • 宋宇家 ,
  • 雷征东 ,
  • 唐煊赫
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  • 1.成都理工大学油气藏地质及开发工程国家重点实验室,成都 610059;
    2.西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500;
    3.中国石油勘探开发研究院,北京 100083
朱海燕(1984-),男,安徽亳州人,博士,成都理工大学能源学院教授,主要从事石油钻采岩石力学方面的教学和科研工作。地址:四川省成都市成华区二仙桥东三路1号,成都理工大学能源学院,邮政编码:610059。E-mail:zhuhaiyan040129@163.com

收稿日期: 2021-05-28

  修回日期: 2021-12-07

  网络出版日期: 2022-01-21

基金资助

国家自然科学基金面上项目“页岩储层射孔簇内复杂三维多裂缝起裂与竞争扩展机理研究”(51874253); 国家自然科学基金联合基金重点项目“四川深层页岩智能传控靶向复合压裂基础研究”(U20A20265)

4D-stress evolution of tight sandstone reservoir during horizontal wells injection and production: A case study of Yuan 284 block, Ordos Basin, NW China

  • ZHU Haiyan ,
  • SONG Yujia ,
  • LEI Zhengdong ,
  • TANG Xuanhe
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received date: 2021-05-28

  Revised date: 2021-12-07

  Online published: 2022-01-21

摘要

综合考虑储集层物性和力学参数的非均质性、初次压裂裂缝以及实际注采制度影响,提出了一套致密砂岩油注采开发过程中储集层多物理场四维地应力演化数值模拟方法,建立了致密砂岩油储集层渗流-地质力学耦合的四维地应力演化模型,以鄂尔多斯盆地华庆油田元284区块为例,开展了水平井注采开发过程中四维地应力演化规律研究。研究表明:①受注采关系影响,注水井处三向应力增大,生产井处三向应力减小,但平面上水平两向主应力沿各自应力方向呈明显的条带状分布。②注采开发过程中,水平两向主应力差在注水井所对应的水平井井筒处最大,而在注水井之间的未动用区域则最小;在注水井处最大水平主应力方向变化最大,且呈径向汇聚状分布。③注采井网中,水平井重复压裂时,水力裂缝受地应力影响会出现非对称扩展和方向偏转。研究结果有效指导了致密砂岩油水平井注采井网调整和重复压裂设计。

本文引用格式

朱海燕 , 宋宇家 , 雷征东 , 唐煊赫 . 致密油水平井注采储集层四维地应力演化规律—以鄂尔多斯盆地元284区块为例[J]. 石油勘探与开发, 2022 , 49(1) : 136 -147 . DOI: 10.11698/PED.2022.01.12

Abstract

To investigate the 4D stress change during injection and production in tight sandstone reservoirs, a multi-physical fields modeling method is proposed considering the reservoir heterogeneity, hydraulic fracture and complex injection-production system. The 4D stress evolution of tight sandstone reservoir in Yuan 284 block of Huaqing oilfield, Ordos Basin, during injection-production in horizontal wells is investigated by modeling coupled flow and geomechanics. Results show: (1) Induced by injection and production, the 3D stress increases near the injectors but decreases near the producers, and the horizontal stresses are distributed in obvious strips along their respective stress directions. (2) The horizontal stress difference is the highest at the horizontal wellbore beside injectors during injection and production, while it is the lowest in undeveloped zone between the injectors, and the orientation of maximum horizontal principal stress changes the most near the injectors, which is distributed radially. (3) The hydraulic fracture in re-fracturing well was observed to be asymmetrical in geometry and deflected as the stress changed. The results provide theoretical guidance for horizantal well network modification and re-fracturing optimization design in tight sandstone reservoir.

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