OPERATIONS CONTROL METHOD FOR RESERVOIR FLOODING

摘要

FIELD: oil and gas industry.SUBSTANCE: invention is referred to oil and producing industry and targeted to development of automatic monitoring and control system for oil reservoirs flooding based on wells cross feeding evaluation. According to the method oil is extracted through producers and working agent is injected through injectors. For the purpose of evaluation of producers and injectors cross feeding the initial field data for producers and injectors are converted by basic functions system. The initial data for each injector and potentially reacting producer include such indices as date of measurement, injectivity value, liquid rate, water cut, state of the well in operation and idle state. Smoothing functions ensuring linear or exponential smoothing such as sliding window or wavelet analysis or neuron networks are used as basic functions. By means of basic functions trend of field data for wells is defined, useful component in well operation dynamics is identified and noises are removed. Then influence coefficients are defined on the basis of comparison for converted field data. Converted dynamics for all selected wells for each basic function are divided into fragments corresponding to growth and fall in basic function. When at length of one fragment change in operation mode is noted, then this fragment is divided into two new fragments. Correlation index is calculated for each basic function between fragments in dynamics of the injector and reacting producer considering the period of time required for response of the producer to change in the operation mode of the injector. Utility value for wells is defined against value to which correlation index strives depending on quantity of analysed fragments. Considering mutual influence of the wells recommendation are issued on redistribution of injection for the purpose of effective arrangement of oil displacement by water and maintenance of reservoir pressure.EFFECT: improving efficiency of reservoir pressure maintenance.6 dwg