The organization of an underground gas storage facility (UGS) at the Zapadno-Messoyakhsky area of the Vostochno-Messoyakhskoye field has been proposed in order to minimize economic costs and to significantly reduce environmentally harmful emissions into the atmosphere during the utilization of associated petroleum gas (APG). A feature of this UGS facility is the gas injection into a productive formation containing an oil rim and a gas cap. In this regard, it is necessary to prevent the dilution of oil reserves during the exploitation of the gas storage and ensure the inclusion of oil reserves in the development. As part of the project implementation, a cluster of injection gas wells was built, and control of changes in the gas cap of the PK1-3 formation associated with APG injection was organized.
The article considers the evaluation of a number of projected risks of the facility: dropout of hydrates in the reservoir, hydrate formation in the wells of the active fund, as well as clarification of the hydrodynamic connection of the facility blocks and the possible volume of gas injection before its breakthrough under the water-oil contact. The main tool is hydrodynamic reservoir model, which allow take into account the specifics of the geological structure, the history of the exploitation of the facility, and the decisions made to organize and control the underground storage facilities at the Zapadno-Messoyakhsky area. Recommendations were made on well operation modes to minimize risk of hydrate dropout. A tool was created to evaluate the dynamics of hydrate formation risks based on well operation data, measurements in control well and the results of hydrodynamic modeling. The volume of gas injection before breakthroughs into the oil rim and under the oil rim has been estimated. A number of recommendations were issued for the exploitation of underground storage facilities. The obtained results, tools and approaches to modeling can be used in the future to control the exploitation of underground storage facilities at Zapadno-Messoyakhsky area, as well as be applied to analogue facilities.
References
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