Production Dynamic Analysis Study Of Gas Well For Water-Gas Reservoir

The L gas field is Located in the Mud-Fluid Diapir Areas of the Yinggehai Basin in the South China Sea,the geological reserves are of medium scale.The development model is divided into the North and South blocks in the plane,and the North block is divided into upper,middle,and lower strata.The lower development sequence of the Y1? and Y1? gas groups is driven by weak edge water,and the gas reservoir type is dominated by layered edge water structure gas reservoirs.After the gas well sees water,the water production capacity of the gas well increases rapidly,the gas production capacity decreases significantly,and the water gas ratio increases rapidly.Many wells in gas fields have installed underground pressure meters,and a large amount of dynamic pressure data has been obtained.However,at the same time,there are problems such as insufficient application of pressure data and difficult analysis of the dynamics of the production of water and gas reservoirs.It is necessary to find a production dynamic analysis method suitable for water-gas reservoir to guide gas field development.This research investigates the domestic and foreign production dynamic analysis technology,and believes that the existing dynamic analysis method is only suitable for the failure of gas mining reservoirs,and is not suitable for the situation of side water,bottom water,and water injection.At the same time,there is no complete theoretical system and software for dynamic analysis of water-bearing gas reservoirs.It is necessary to consider new interpretation methods and carry out research on seepage model and production capacity reduction analysis of water-bearing gas reservoirs.Therefore,on the basis of the analysis of the geological gas reservoir characteristics and the dynamic characteristics of typical water-producing gas wells in the L gas field,A flow model for horizontal well gas reservoirs and a coupling model for gas seepage and wellbore have been established for homogenized gas reservoirs,horizontal wells,bottom water/water injection wells and water intrusion gas reservoirs,and a modern method for the analysis of output reduction has been introduced.A set of dynamic analysis flow for production well is formed.Finally,the dynamic analysis of single well production is carried out for the target area,and the result is scientific and reliable by using AIWT.It has important guiding significance to improve the accuracy of boundary bottom water driving,reservoir parameter evaluation,dynamic reserve calculation and production prediction.