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疏松砂岩注水破裂机理及完整性研究
引用本文:刘兆年,周建良,文敏,杨玉贵,隋先富.疏松砂岩注水破裂机理及完整性研究[J].科学技术与工程,2015,15(1).
作者姓名:刘兆年  周建良  文敏  杨玉贵  隋先富
作者单位:中海油研究总院,北京,100027
基金项目:国家科技攻关计划;国家自然科学基金项目(西非、亚太及南美典型油气田开发关键技术研究)
摘    要:常规的注水压力设计仅考虑裂缝开裂的压力,不能预测长期注水过程地层岩石物理参数及地应力的变化。从疏松砂岩注水过程近井筒周边受力分析入手,分析地层周边地应力及岩石力学性质变化,得到疏松砂岩在注水过程中拉伸及剪切破坏机理;并根据有效应力概念预测出地层孔隙度和渗透率变化。通过分析长期注水过程油藏及上覆盖层岩石物理性质及地应力的变化,建立以盖层的剪切破坏、拉伸破坏和断层的重新开启为依据的注水完整性分析模型。以乌干达Buffalo油田为例,通过数值模拟分析了地层参数及应力变化及不同注水压力敏感性分析,确定了该油田的安全注水压力,通过该方法大大提高了注水能力,在保证注水安全的情况下,为油田的增产增注提供了保障。

关 键 词:疏松砂岩  注水  完整性  数值模拟
收稿时间:8/1/2014 12:00:00 AM
修稿时间:2014/12/16 0:00:00

Study on Unconsolidated Sandstone Reservoir Water Injection Failure Mechanism and Well Integrity
Liu Zhao-nian,Zhou Jian-liang,Wen Min,Yang Yu-gui and Sui Xianfu.Study on Unconsolidated Sandstone Reservoir Water Injection Failure Mechanism and Well Integrity[J].Science Technology and Engineering,2015,15(1).
Authors:Liu Zhao-nian  Zhou Jian-liang  Wen Min  Yang Yu-gui and Sui Xianfu
Institution:CNOOC Research Institute,CNOOC Research Institute,CNOOC Research Institute,CNOOC Research Institute
Abstract:Conventional water pressure design method is only based on formation fracture pressure, the method cannot predict long-term formation parameters and stress changes when water injection. Based on near wellbore stress and formation parameter analysis, unconsolidated sandstone failure mechanism and porosity and permeability change in reservoir are gotten. Based on analysis of reservoir and cop rock parameter and stress change which long-term water injection influence on, fault re-active, tensile and compress failure of cap rock integrity model is established. A water injection model is constructed to simulate Uganda Buffalo oilfield water injection, reasonable and safe water injection pressure is gotten, and injectivity is greatly improved in safe condition by used this method.
Keywords:Unconsolidated sandstone  water injection  well integrity  numerical simulation
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