压力恢复曲线在压井液密度优化中的应用

由于高压低渗裂缝性储层导压能力较弱,关井后压力恢复缓慢,因此根据地层压力确定的压井液密度偏高、易造成储层污染,通过对储层压力恢复速度进行分析,确定出适用于不同压力恢复速度和施工周期的压井液密度,现场应用后取得了较好的油层保护效果和经济效益,并为同类储层压井液密度的选择提供了良好的借鉴.

Application of Pressure Build-up Curve in High-pressure, Low-permeability Reservoir Well Killing Fluid Density Optimization Process

Because of weak pressure conductive ability in high-pressure and low-permeability reservoir,pressure builds up slowly when the oil well shut down,and well killing fluid density,according to formation pressure,is higher,resulting in formation damage.In this article,through analyzing pressure build-up speed of the reservoir,the writer determines the appropriate well killing fluid densities which are suitable for different pressure build-up speed and operating cycle.Great effects and economic benefit have been achieved by in-site application,and the reference can be provided for the well killing fluid density optimization in the similar reservoirs.