Research And Application Of Deconvolution Well Test Technology

The essence of deconvolution calculation is optimized.Deconvolution recreate from the real data,the ideal pressure changes to a constant production over the same period.So we could get the pressure response of a whole test procedure,obtain bigger investigation radius than any period of pressure recovery.Moreover there is no effects of simplified production and superposition calculation,also no error caused by incomplete production history.Thus we can get more reservoir information,gain more and much reliable results.In this paper,from the sense,method of deconvolution,Schroete,Levitan are discussed.And by simulating the numerical experiments,we explained how the deconvolution works.At the same time,sensitivity,conditions of use,advantages and limitations of the method are also discussed.Because in ultra-low permeability reservoirs,the shut in build-up time is short,and the investigation radius which is calculated by conventional analysis for well test is limited.These seriously affected the follow-up well spacing pattern and well density.In this paper,deconvolution method is applied to ultra-low permeability reservoirs,and through well test design,we analyzed the main factors of influence well test interpretation in ultra-low permeability sandstone reservoirs,and also showed the effectiveness and superiority of the approach.In this paper,deconvolution technique is applied to Puguang gas field and low permeability reservoirs in exploration area of Inner Mongolia.Showed by the actual field application of 13 wells,it can be proved that deconvolution has solved the long-term shut in operation occupy problems in Inner Mongolia and has solved the large safety problems because of Puguang with high corrosive gas such as H₂ S,CO₂ if using wire test for long time could cause sour gas leaks and downhole tool fall well.The method has also eliminated the interpretation ambiguity of conventional analysis for well test and we could obtain bigger investigation radius.