超低渗透油藏油井流入动态及合理流压研究

对于超低渗透砂岩油藏,合理的井底流压是保证油井稳产的关键因素之一。启动压力和应力敏感性的存在,使得超低渗透油藏油井合理流压的确定更加困难,开发难度加大。在前人研究的基础上,考虑启动压力梯度和应力敏感性的影响,对已有的油井产能方程进行修正;与油相的相对流动能力相结合,建立了新的油井流入动态方程。以鄂尔多斯盆地L1区长8油藏为例,对新的油井流入动态方程的可靠性进行分析验证,探讨了超低渗透油藏油井合理流动压力确定方法,为矿场实际生产提供科学依据。

The Study of Inflow Performance and Proper Bottom-hole Fluid Pressure in Ultra-low Permeability Sandstone Reservoir

To ultra-low permeability sandstone reservoir, proper bottom-hole fluid pressure is a key to stable production of the wells. It is very difficult to determine proper bottom-hole fluid pressure due to the threshold pressure and pressure-sensitive. Based on the previous studies, considering the impacts of threshold pressure gradient and pressure-sensitive, modifying the old production equation, combining with the oil phase relative fluid ability, a new IPR equation was developed. It shows that the new IPR equation can be used for determining the reasonable fluid pressure and provide a theoretical basis for reasonable developing ultra-low permeability sandstone reservoir.