Perpustakaan Digital ITB

The increasing need for oil and gas products is a rising challenge that cannot be avoided by oil and gas-producing countries. In Indonesia, the gas consumption in Indonesia increased yearly while the production supplies have continuously decreased since 2010. Therefore, preventing excessive water production is one of the answers to increasing gas production. One of the critical reasons for excessive water production is cone formation. Water coning is the potential for the water at the local gas-water contact to rise vertically until it eventually breaks through the perforation in the well. The critical rate is called the limiting rate that will cause cone instability and water breakthrough. This study uses a simulation of water coning behavior on a vertical well by comparing the time to water breakthrough on water saturation performance and cumulative water production based on five parameters. The parameters that could have a significant impact on how water production behaves were chosen, and potential adjustment ranges were identified. A CMG program was created for each of the predetermined combinations of the chosen parameters, getting the water production in the center well as a function of operational period of the well. The results of this study predict that water imbibition from fractures to the matrix and pressure drop significantly influences water coning behavior with all sensitivity parameters consistent with the published literature. The reduced water coning could be achieved on a high permeability fracture to matrix ratio and by increasing the distance of the deepest perforation to WGC.