高文喜
GAO Wenxi

• 1:大庆油田有限责任公司第一采油厂

摘要(Abstract)：

针对低渗透储层超前注水开发过程中应力敏感现象,在模拟实际地层条件下,开展超前注水应力敏感实验。实验选用某油田储层天然岩心,分别模拟超前注水阶段、降压开采阶段和压力恢复阶段应力敏感现象。实验数据处理中,考虑轴向应力和径向应力对岩心共同作用。实验结果表明:超前注水过程中,岩心有效应力降低,岩心发生塑性变形,渗透率增大,有较强应力敏感现象,渗透率越低,应力敏感程度越强;当流体压力降低时渗透率降低轨迹大于超前注水阶段渗透率增大轨迹,当流体压力低于油藏初始压力时岩心渗透率并未发生强应力敏感现象。同时引入应力敏感系数,得出应力敏感与储层渗透率呈幂函数关系。因此,低渗透储层超前注水不仅提高油藏压力,而且可有效增大储层渗透率,减小储层伤害。
In the light of the stress sensitivity problem of advanced water injection for the extra-low-permeability reservoir,the sensitivity test is caught out under the conditions of simulating the actual formations. The natural cores are chosen from certain oilfield for the experiment,the stress sensitivity phenomena are respectively simulated in the following stages: water injection,depressurized production and pressure recovery. In the process of the experimental data,considering the co-action of the axial and radial stresses on the core,the achievements show that during the advanced water injection,the effective stress of the core is reduced,and moreover the core plastic deformation occurs,the permeability increases with strong stress sensitivity phenomenon,the lower the permeability is,the stronger the stress sensitivity will be; When the fluid pressure reduced,the permeability reduced degree is more higher than the risen one of the permeability at advanced water stage,when the fluid pressure is lower than the initial pressure of the oil reservoir,the strong stress sensitivity phenomenon doesn't happen for the permeability of the core. At the same time,with the help of introducing the stress sensitivity coefficient,the power function relationship is established between the stress sensitivity coefficient and reservoir permeability. Therefore the advanced water injection for the low-permeability reservoir can not only improve the pressure,but also increase the permeabil-ity and reduce the damage.

关键词(KeyWords)： 超前注水;应力敏感;塑性变形;有效应力
advanced water injection;stress sensitive/sensitivity;plastic deformation;effective stress

Abstract:

Keywords:

基金项目(Foundation): 中国石油股份公司科技攻关项目(2011B-1506)

作者(Author): 高文喜
GAO Wenxi

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