从注水井压力降落测试 (即注水井落差测试 )的压力特性出发 ,对注水井的测试资料 (包括压力降落曲线及压力指数PI值在关井 90min时所得的PI(90 )值 )进行分析、研究 ,拓展了注水井压降资料的应用领域 ,将这些认识应用于喇嘛甸油田三次采油试验的选井、选层及效果评价等方面 ,效果显著。粘土调剖试验说明 ,引入PI(90 )值校正公式比较符合实际 Based on the pressure characteristics of the injection well pressure drop test (ie, the injection well drop test), the test data of the injection well (including the pressure drop curve and the PI (90) value of the pressure index PI value at 90 min of shut-in) Research and expand the field of application of pressure drop information of water injection wells, the application of these findings in the well drilling, selection and effect evaluation of the third oil recovery test Lamadian Oilfield, the effect is significant. The clay profile test shows that the PI (90) value correction formula is more realistic