大港油田驴驹河储气库注采渗流机理研究

Study on injection-production seepage mechanism of Luju River gas storage in Dagang Oilfield

为深入研究大港油田板桥地区储气库在多周期注采过程中气水两相流体的渗流规律,以该地区驴驹河储气库储层岩心为对象,开展储层流体相渗特征及储层注采模拟岩心渗流特征实验研究。结果表明:经过多次气水交互驱替实验后,出现气水相渗滞后现象,孔隙系统中部分区域孔喉微小,导致相渗滞后现象更为明显;建库储层在周期性注采过程中,气驱水纯气带受膨胀携液作用影响,储气空间增加;气水过渡带受气水互锁作用影响,气相渗流及动用率降低。该研究可为驴驹河储气库开发动态分析、预测、调整、提高采收率、设计库容参数以及安全运行提供科学依据,也为后期储气库数值模拟研究分析奠定基础,达到准确评价与预测储气库产能的目的。

In order to deeply study the percolation law of gas-water phase fluid in the process of multicycle injection and production in Banqiao area of Dagang Oilfield,the reservoir core of Luju River gas storage in this area is taken as the object to make experimental studies on reservoir fluid phase permeability and core seepage characteristics of reservoir injection-production simulation.The results show that the gas-water phase permeability lag phenomenon occurs after many times of gaswater interactive displacement,and the pore throat in some areas of the pore system is small,which leads to the phase permeability lag phenomenon is more obvious;in the periodic injection-production process of the reservoirs,the gas drive water pure gas zone is affected by liquid carrying expansion action,the gas storage space is increased;the gas-water transition zone is affected by gas-water interlock action,the gas phase seepage and utilization rate are reduced.This study can not only provide a scientific basis for dynamic analysis,prediction,adjustment,oil recovery improvement,capacity parameters design and operation safety of Luju River gas storage,but also lay a foundation for numerical simulation study and analysis of gas storage in the later stage.The purpose of accurately evaluating and predicting the productivity of gas storage is achieved.