Evaluating representativeness of key wells network for gas-oil ratio monitoring at the mature fields

UDK: УДК 622.276.346.2
DOI: 10.24887/0028-2448-2018-04-55-57
Key words: oil, gas factor, key wells network, gas-oil ratio, associated petroleum gas gas, casing-head gas, bubble point pressure
Authors: R.N. Imashev (BashNIPIneft LLC, RF, Ufa), V.N. Fedorov (Ufa State Petroleum Technological University, RF, Ufa)

The aim of the work was the solution to the problem of evaluating the representativeness of core network of wells for field monitoring of gas factor with predetermined maximum allowable error of measurement. The question of the justification of the minimum required number of wells for core network is associated with the fact that a number of objective reasons do not allow monitoring gas-oil ratio in all wells. The proposed approach to the evaluating the representativeness of core network is based on statistical methods that can be applied to solve other control problems of field development, for example, the monitoring reservoir pressure profile, because it is general in nature. We considered the evaluation of the representativeness of core network for measurement of the gas-oil ratio on the example of one of the fields in the western part of the Republic of Bashkortostan. For this field, it is shown that the core network of wells should be at least 70% of the all producing wells on the examined object of development. It is noted that the value of the coverage of the core network of wells 70% applies to this particular case. At lower magnitude of the range of gas factor values for individual wells minimum required core network of wells can be much smaller.


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