Ufa State Petroleum Technological University, Ufa, Russia:

V. M. Lobankov, Head of Chair, Doctor of Engineering Sciences, lobankov-vm@mail.ru
L. R. Akhmetova, Associate Professor, Candidate of Engineering Sciences
Z. G. Gareishin, Associate Professor, Candidate of Engineering Sciences
N. M. Mamontov, Lecturer

Estimation and control of geological and recoverable hydrocarbon reserves in oil and gas fields belongs to one of the national strategic objectives of Russia. The estimation (calculation) of recoverable oil reserves is based on measuring activities of geophysical and oil companies. The received measurement information about the reservoir should be high quality and reliable. Borehole geophysical measurements taken in the evaluation of oil reserves that should be attributed to the state accounting operations included in statistical reporting. In accordance with Federal Law No. 102-FZ of 26 June 2008 on Uniformity of Measurements, such measurements should fall within the ambit of the state regulation. It is known that indicators of the quality (uncertainty) of measurements of geophysical parameters of oil and gas reservoirs and petrophysical measurements on core samples extracted from wells are systematic and random errors of measurements. The problem lies in the fact that today thereare no defined and standardized quantitative indicators allowing to put proven reserves of oil to one or the other category in accordance with the new classification accepted in Russia in 2015. In addition, there are no requirements for permissible errors of borehole geophysical equipment used for the evaluation of oil reserves. The authors justify and evaluate permissible relative errors for appraisal of petroleum reserves by indirect measurements for each of the categories, as well as for geophysical parameters of oil and gas reservoirs. It is shown that improvement of geophysical measurement equipment requires national standards to be set for parameters of oil and gas formations traversed by wells in typical geological and technical conditions of in-situ measurements.

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