| Popis: |
To predict water breakthrough time for horizontal wells in gas reservoirs with edge water is in favor of the efficient development and reasonable evaluation of gas reservoirs. All existing models for the prediction assumed that the gas conformed to Darcy flow. For the horizontal well with high production, effect of the non-Darcy flow should be taken into consideration because of the high speed of gas flow. In order to analyze the actual water breakthrough time for horizontal wells in gas reservoirs with edge water, on the basic of the theory of mass point percolation flow through porous media for horizontal wells, a formula was developed to predict water breakthrough time for horizontal wells in gas reservoirs with edge water, considering non-Darcy flow, reservoir fluid property, length of horizontal interval and other factors. A calculation example of a horizontal well has been performed and the effect factors have been analyzed. Results indicate that compared to the formula which ignores the effect of the non-Darcy, an example shows that the correlation in the paper is more tally with the actual situation. |
