Investigating the Mechanism of Water Inflow in Gas Wells in Fractured Gas Reservoirs and Designing a Controlling Method

Water inflow may cease production of gas wells,leaving a significant amount of gas in the reservoir. Conventional technologies of gas well dewateringremove water from inside the wellbore without controlling water at its source. This paper addresses mechanisms of water inflow to gas wells in fracturedreservoirs and a new completion method to control it. In a vertical oil well, the water cone top is horizontal, but in a gas well, the gas/water interfacetends to bend downwards. It could be economically possible to produce gas-water systems without water breakthrough. Non-Darcy flow effect (NDFE),vertical permeability, fracture characteristics, aquifer size, density of well perforation, and flow behind casing increase water coning/inflow to wellsin gas reservoirs with bottom water. In this paper Downhole Water Sink (DWS) installation in gas wells includes dual completionwith an isolating packer and gravity gas-waterseparation at the bottom completion is studied for removing the water coning problem of a well in Reservoir A in Iran. Accordingto the results of this study, the best DWS completion design should comprise a short top completion penetrating 20% - 40% of the gas zone, a longbottom completion penetrating the remaining gas zone, and vigorous pumping of water at the bottom completion. Being as close as practically possible the two completions are only separated by a packer. To Sum, it can be mentioned that DWS extends thewell life longer and could be a proper solution for the well studied in this work

کلیدواژه ها:

WaterConning ، Gas Wells ، Fracture Reservoirs ، DWS