The article considers the principles of key well network development at R.Trebsa oil field for controlling the reservoir pressure profile, which is characterized by of filtration and productive properties heterogeneity. For that type of reservoirs development of key well network faces a problem caused by lateral heterogeneity and block structure of reservoir. Actual-to-date regulatory documents and procedures, which are dedicated to well tests, don’t take into account aspects mentioned above. It is shown that these failures lead to loss of information and unability of effective reservoir development. The authors propose an algorithm of key well network development taking into account lateral heterogeneity. One of the principles is based on the identification of hydrodynamically connected parts of oil reservoir on the basis of reservoir pressure profile and field data. It is shown that in case of intensive reservoir pressure decline the frequency of pressure measurement is crucial. Proposed frequency of well tests (once a year quarter) within one hydrodynamically connected zone showed its effectiveness in monitoring the oil reservoir development, in particular, when determining the effect of reservoir pressure maintenance and fault’s conductivity. The article presents calculations of minimum required number of key wells based on heterogeneity coefficient. The recommended number of well tests in order to determine current reservoir pressure is 25% of producing well stock. A block diagram of the algorithm for development of key well network is given taking into consideration the input of new wells.
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