新立Ⅵ区块各类储层的极限井距确定

Determination of Critical Well Spacing in Different Reservoirs of Xinli Area

低渗透岩心单相渗流实验表明,流体渗流时存在启动压力梯度。通过对实验数据的处理得到了实测的启动压力梯度;依据启动压力梯度的非线性渗流方程,得到了低渗透储层启动压力梯度与渗透率的幂函数关系式。结合低渗透油藏渗流理论得到了低渗透油藏确定极限技术井距的公式,可为低渗透油田开发确定不同储层下的极限井距。

The experiment of single-phase flow through low permeability core showed that there existed start-up pressure gradient during fluid flow. The observed start-up pressure gradient was derived through processing experimental data, the power function of start-up pressure gradient and permeability in low permeability reservoir was obtained based on the linear flow function of start-up pressure gradient. Combined with the percolation theory of low permeability oil reservoirs, the function of determining critical technological spacing in low permeability reservoirs was derived, which can provide the theoretical basis for determining reasonable well spacing during the development of low permeability oil reservoirs.