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 RESERVO IR W ELL K ILLING FLUID DENSITY OPTIMIZATION PROCESS

Because ofweak pressure conductive ability in high-pressure and low-permeability reservoir, pressure builds up slowly when the oilwell shutdown, 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, thewriterdetermines the appropriate well killing fluid densities which are suitable for different pressure build-up speed and operating cycle. Great effects and economic benefithave been achieved by in-site application, and the reference can be provided for the well killing fluid density optimization in the similar reservoirs.