Determination of the Operating Mode of a Gas Deposit based on Hydrochemical Monitoring Data

Author details
  • Severneftegazprom LLC, Novy Urengoy, Russian Federation
  • Institute of Oil and Gas Problems of the Russian Academy of Sciences, Moscow, Russian Federation

Abstract

One of the most pressing problems in the development of oil and gas fields is the problem of reservoir flooding. For weakly cemented gas-saturated reservoirs, raising the contour of the gas-water contact leads to such a negative effect as an increase in the intensity of sand removal into the well, which significantly reduces the efficiency of gas reservoir development. An increase in water saturation also results in a change in the operating mode of the gas-saturated reservoir, which requires appropriate technological and design decisions. One of the most effective methods for predicting and controlling the rise in the water level is the use of hydrochemical monitoring (control) based on chemical analysis of liquid samples taken from production and observation wells. This method has shown its effectiveness in summarizing hydrochemical information based on chemical analyses of associated water samples taken from wells in the Senomanian deposits of the Urengoy, Medvezhye, Yamsoveiskoe and Yubileynoe fields. The article presents the results of forecasting changes in the operating mode of a gas reservoir and reservoir water breakthrough based on an analysis of an array of data on the composition of associated waters from producing wells. Criteria such as the sodium-chlorine coefficient, the Larsen-Skold index, changes in the quantitative content of chlorine ions, and the degree of saturation of water with calcium carbonate were used as indicators of the transformation of the initial hydrochemical medium. The forecast was based on data from eight wells developing the Pokursky reservoir of one of the deposits of the Yamalo-Nenets Autonomous Okrug. It is shown that for some wells it is possible to clearly determine the time of the beginning of the breakthrough of reservoir water, while some wells operate in gas mode.

Keywords

reservoir operation modehydrochemical controlsodium-chlorine coefficientLarsen-Skold indexdegree of water saturation with calcium carbonatewater mineralizationwellreservoirgas-water contactsand phenomenasuffusionchloride ionreservoir watercondensation watergeophysical studies of wells

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Article information

Published
24 October 2025
Issue date
24 October 2025
Issue
Vol. 25, No. 3 (2025)
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