The Productivity Evaluation And Production Proration Of Dabei 201 Gasfield

Dabei 201 gasfield located on Kuche subsidence Kelasu tectonic's Dabei-Tubei part which in Tarim basin,it is one of important gasfield of Tarim oilfield.This gasfield is very complex on lithologic and lithofacies.It produced a lot of water and sands during production,so it is necessary to evaluate the productivity of each well.First of all,basic information of Dabei 201 gasfield was surveyed and then some basic research on gas-reservoir engineering was be done in order to have a better knowledge about this gasfield.Secondly,the square of pressure method,exponential method,the pseudo pressure method and the pseudopressure method which considered the stress sensitive was be used to evaluate the productivity.After got the productivity equation and absolute open flow of these wells,they were used to calculate a productivity equation which is called one point method.And then the absolute open flow of other wells were calculated.Thirdly the various factors influencing the productivity were analyzed,and then the absolute open flow of gas wells,the reasonable use of formation energy,the critical flow rate which can carry liquid out,the critical production pressure caused sand production and the critical flow rate of bottom water coning were considered to calculate the reasonable production of each well.Last but not the least,these five factors were synthetically considered to calculate the reasonable production of these nine Wells,in order to make sure these wells and the wells nearby can be efficient.