A Study On Su-20 Well Field Dynamic Analysis

Su-20 block lies in the midwest of the Sulige gas field,has entered construction and operation in 2006,is a large lithologic gas field with typical low-pressure,low-permeability,low-abundance and low-gas-production characters.Becanse being alluvial due to fluvial depositional system,the reservoir continuity is poor,but heterogeneity is strong,a series of problems are exposed with the development of production,such as fast decreasing of pressure,short stable production time,together with serious water-production problems.In the gas field development,wells production dynamic forecasting is the basis for production dynamic analysis,reasonable development consultation and technical economic evaluation.Therefore,in order to further enhance its productivity and extend the stable production time,it is necessary to evaluate present pressure and analysis production dynamics of Su-20 block.This paper combined gas reservoir engineering methods with a variety of dynamic data calculation ways to assess the current formation pressure level and the characters of its distribution,secondly,this paper studied wells production decline analysis and calculated reservoir parameters such as permeability and dynamic reserves through modern production uncertainty analysis method,meanwhile adopt "one point method" and modified isochronol testing method to evaluate the productivity.Finally,the dynamic and static discrepancies wells and wellbore effusion gas well had been studied for putting forword reasons and proposed technical measures,the research of the paper offer a reliable,advisable and applicable basis and technical guidance for engineering design,adjustment of development design and management of the subsequent gas field development.