Research on reservoir interwell dynamic connectivity using systematic analysis method

The injection-production system has the features of the first-order linear time-delay systems. The systematic analysis method was used to establish the reservoir interwell dynamic connectivity inversion model. The parameters of the model have the specific meaning and can be used to effectively identify the interwell connectivity and time lag. The corresponding method for solving the characteristic parameters was proposed on the basis of the Quasi-Newton algorithm. The interwell connectivity of Gao-13 Block in Jidong Oilfield was inversed. The corresponding result of interwell connectivity was mapped. According to the different inversion result, the well pattern could be divided into three types, including isotropic connection, one direction connection and linear connection. The statistic result of current fluid levels of producing wells in the block indicated that the new method for inversion of interwell connectivity had a good agreement with the practical situation and could effectively provide good basis for the next decision-making of reservoir development plan.