The study sets out the main features of producing horizons at the Chayandinskoye oil, gas and condensate field (Republic of Sakha (Yakutia)): low formation temperatures, high salinity of the residual reservoir water, risk of hydrate formation in the bottom hole formation zone. It determines the hydrate formation conditions depending on the pools’ pressure-and-temperature conditions, formation gas composition, and residual water salinity. It also analyses the specific features of hydrate formation in the bottom hole formation zone associated with underbalance, gas cooling during throttling, and water vapor condensing from the filtered gas with residual water salinity near the borehole reduced. According to the thermodynamic analysis, reservoir drawdown of hydrate-free operation is estimated to be 1.0–1.2 MPa for long-life gas well operations at Chayandinskoye field. It is feasible to further clarify this value for the field’s production wells, which will require additional specialized research.
Keywords: CHAYANDINSKOYE OIL, GAS AND CONDENSATE FIELD, GAS HYDRATE, BOTTOM HOLE FORMATION ZONE, GAS PRODUCING WELL, RESIDUAL RESERVOIR WATER, SALINITY.