Study of the Efficiency of Methods for Enhanced Condensate Recovery, Based on Reservoir Simulation Models

About the authors:

Evgeny S. Makarov, Postgraduate Student, Institute of Physics and Technology, Tyumen State University; Head Specialist, LLC “Tyumen Petroleum Research Centre”; esmakarov2@rosneft.ru

Anton Y. Yushkov, Cand. Sci. (Tech.), Associate Professor, Department of Development and Operation of Oil and Gas Fields, Tyumen Industrial University; General Manager, Tyumen Petroleum Research Center; ayyushkov@tnnc.rosneft.ru; ORCID: 0000-0002-6160-0689

Alexander S. Romanov, Cand. Sci. (Tech.), Team Leader, LLC “Tyumen Petroleum Research Centre”; asromanov@rosneft.ru

Abstract:

The purpose of this work is to assess the technological effectiveness of methods for increasing the condensate recovery from the Achim deposits of the Urengoy oil and gas condensate field (geological horizon Ach₅^2-3, the East-Urengoy License Area). The distinctive features of the Achim deposits are low permeability (of the order of 1 mD) and anomalously high initial reservoir pressure (≈ 600 atm).

Technological calculations were performed using the composite hydrodynamic model implemented in the ECLIPSE 300 format. For the modeling of the methods of increasing the condensate recovery the authors selected the development element at one of the sections of the Ach₅^2-3 reservoir in which the average parameters corresponded to the parameters of the full-scale model. Evaluation of the effectiveness of various methods was performed by comparing the selected methods with the baseline scenario, which represents the traditional scheme for the development of the gas deposit — depletion. As alternative scenarios of the development, the methods for sustaining reservoir pressure by injecting various agents into the reservoir were considered: dry gas ("cycling"), nitrogen, water, mixed effects of gas and water (water and gas impact). In addition, the optimal ratio of injection and production wells, the amount of injection compensation, and the rate of gas extraction were selected.

Using the simplified economic model the economic efficiency of various development scenarios was evaluated. The principle of the variants ranking was the integral parameter, which includes accounting both technological (gas / condensate extraction coefficients) and economic indicators (net discounted profit, discounted state profit).

The results of performed studies for increasing the condensate recovery from reservoirs show the effectiveness of the use of non-traditional technologies for the development of gas condensate deposits. This is achieved primarily by a relative increase in condensate recovery by 40-50% compared with the baseline scenario.

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