Dynamic Monitoring And Evaluation On Water Injection Development Of Qingpingchuan Oil Field

Water injection is one of important methods for supplement of natural energy for oil development. Howerver, a lot of new problems have been met during water injection, such as direction of reservoir heterogeneity and degree of reservoir heterogeneity as well as distribution of macroscopic throats of porosity. Tracer dynamic monitoring technology has been used to trace injected water by means of mixture tracer into water injection well. It can give new ideas and information by monitoring water flow velocity, direction, path and other parameters and indicators of injected water during oil development. Qingpingchuan oil field developed at early 1960s, whose oil reservoir is Chang 2 sandstone of Upper Triassic Yanchang Group. The oil reservoir featured with shallow burial depth, low pressure. low permeability and low natural energy. Its heterogeneity is serious.Development technology of water injection has been used for four years and great progress has been got. But many water injection parameters are still unknown because of a lot of troubled problems of water injection. In this paper, a kind of convenient, applicable and inexpensive tracer has been screened out via the study on the principle of tracer flowing and the analysis on the characteristic of Chang 2 oil reservoir of Qingpingchuan oil field. Tracer monitoring experiments were taken on five water injection well groups. Schematic diagram of variation of injected water with time and water injection speed have been investigated, which reflected that water flow velocity and flow direction of injected water are variable. The study reveals water flow characteristics of oil reservoir and lead to right direction for deal with solutions of water injection development of oil fields. It also guide water injection in the coming development period.