Investigating the Mechanism of Water Coning in Fractured Gas Reservoirs

The coning phenomenon usually occurs in water and gas cap drive reservoirs. Water coning inIranian hydrocarbon reservoirs is one of the most important problems that affects the cumulative production,operation costs and causes environmental problems. Before producing from a reservoir, its fluids are inequilibrium and their contact surfaces remain unchanged, but after starting production from the reservoir, whenthe viscous force overcome gravitational force in vertical direction, contact surfaces will displace and coning willoccur. So, the production rates will be controlled in a range that prevents entering water and gas to theproduction well. For this reason, investigation and modeling of this phenomenon is extremely necessary. In thispaper, the coning phenomenon in one of Iranian gas reservoir had simulated using Eclipse 300 software andparameters affecting coning had studied. Results of this work have shown that water production behavior infractured gas reservoirs is mostly depending on production rate. Also, sensitivity analysis revealed that thesensitivity of coning time to the changes of fracture horizontal permeability is more than changes of matrixhorizontal permeability and fracture vertical permeability. In addition, sensitivity of coning time to the fractureporosity changes is more than matrix one.

کلیدواژه ها:

Coning ، Fractured Reservoir ، Simulation ، Water cut ، Cumulative Production