Dynamic Analysis Of Water Intrusion In The Xixi 18 Volcanic Gas Reservoir

Water invading often happens in the development of water-bearing gas reservoirs.It always greatly impacts the performance of reservoirs,decrease the production of gas wells.Further,this damage the income of gas reservoirs.So,it is very important to learn the mechanism as well as calculation of water invading dynamics.The analysis can also be very necessary for adjustment of work system,prolong the period of no water production and decrease the payment of development,thus,contributes the overall economic results.On the basis of the research of literature, two artificial physical models of gas-water two-phase flow in the homogeneous pore model and fracture pore model were analyzed.Through the models, we have a better understanding of the mechanism of water invading; In addition, we devide the model of the water invading, which provides a theoretical basis for the dynamic forecasting model of water invading.Made a generalization and summarization of the the factors affecting gas reservoir water invading, the different recognition methods of water invading, to the early identification of water drive gas reservoir water invading provides more effective choice. This paper mainly make the study on water invading mechanism and water invading volumetric calculate for DX reservoir in Zungar Basin. Through analyzing DX18 block production dynamic features and geological characteristics, the connectedness of the reservoir is learned. According to the calendar year water and water rate analysis data, the water invading characteristics of the block come to light. Combining each wellblock structure and fracture development condition, studied the water production type of wells, water invading pathways and water invading model. Using gas reservoir production data and the measured formation pressure data, and water drive gas reservoir material balance equation,the size of the formation water of typical wells are estimated, meanwhile the water influx of each wellblock and the maximum water influx are predicted, evaluate each wellblock water invasion intensity and water activity. Finally, by using gas reservoir numerical simulation technology, the gas reservoir numerical simulation model was established,further understanding the static and dynamic characteristics of the gas reservoir.Through the above research, the water body size of each wellblock, the intensity and active level of water invading are found.And learned that, formation water won’t mass effect gas reservoir, but Local wellblock could be affected by water cone and been water flooded.