渤海高地饱压差油藏考虑应力敏感的产能评价方法

渤海高地饱压差油藏有着高地饱压差、储层压力变化幅度大等特点，为明确此类油藏应力敏感特性对于其储层产能的影响，论文以Q油田W组油藏为例，在岩心覆压气测渗透率实验的基础上，通过改变岩心有效应力，得出了岩心渗透率与所受有效应力的变化规律。实验表明岩心渗透率与其所受有效应力存在着乘幂式关系，将此变化规律应用于产能分析中，推导考虑应力敏感的稳态产能公式，并绘制产能图版进行对比分析。考虑应力敏感后的产能明显出现整体降低的现象，在不同的储层渗透率下，都存在一个相应的最优生产压差限，这对于渤海高地饱压差油藏合理生产制度的制定具有指导意义。

Method of Productivity Evaluation Considering Stress Sensitivity forReservoir with High Formation-saturation Pressure Difference in Bohai

The reservoir in Bohai is characterized by high formation-saturation pressure difference and large variation of reservoir pressure. In order to clarify the influence of stress sensitivity on productivity of such reservoirs, this study uses the W group reservoir in the Q oilfield as an example and obtains the change patterns of core permeability and effective stress by changing the effective stress of the core on the basis of gas-logging permeability experiment. The experiment result shows that the relationship between permeability change and the effective stress appears to be exponential. This change pattern was applied to the productivity analysis. The steady-state productivity formula considering the stress sensitivity was derived, and the productivity chart was established for comparative analysis. Considering that the stress sensitivity leads to the obvious overall decrease in productivity, there is a corresponding optimal pressure difference limit of production under different reservoir permeabilities. This is of guiding significance for the formulation of a rational production strategy for reservoirs with high formation-saturation pressure difference in Bohai.