The pressure index(PI) decision-making technique is a decision-making technique by the parameter PItGt value for determining the major issues of injectors profile control on the block wide. PItG value can be obtained first by the PIt value calculated based on the pressure drop curve at the wellhead of injector and the definition formula of PIt value, and then by the PIt value correction based on the round average of the injection strength of injectors on the block wide. PItG value can be used for determining the necessity of profile control on block wide, determining the wells for profile control, selecting the agents used in profile control,calculating the amount of the profile control agents, evaluating the effects and deciding the repeated construction time. In recent years, the applications of PIt value and PItG value have made some progresses respectively in distinguishing the full degree of profile control, judging the dominant permeable pathway, selecting the water shutoff wells and guiding profile control construction.%压力指数(PI)决策技术是以决策参数PIG1值决定区块整体调剖重大问题的技术.PUG1值是通过注水井井口压降曲线和PI1值定义式首先算得PI1值,然后用区块注水井注水强度平均值的归整值G将PI1值改正值(PIG1)算出.PIG1值可用作区块整体调剖的选块、选井、选调剖剂及计算其用量、评价调剖效果和决定重复施工时间的决策参数.近年来,PI1值和PIG1值分别在判别调剖的充分程度、识别优势渗流通道、油井堵水的选井和指导调剖施工的应用中取得进展.
展开▼
