A New Method of Predicting Gas Wells′ Productivity of Fractured Horizontal Well of Low-permeability Tight Gas Reservoir
Received date: 2012-10-15
Revised date: 2012-12-07
Online published: 2013-06-10
Fractured horizontal well is an effective method to develop low-permeability tight gas reservoirs and shale gas reservoirs.And the productivity of fractured horizontal well is the key factor which can determine whether unconventional gas reservoirs could be developed effectively.However,there are rare methods which can be used to calculate productivity rapidly,effectively and simply.Therefore,under such a circumstance,it is imperative that researchers should make out new effective measures to improve current condition.To solve this problem,based on numerical simulation and an ideal model,this paper established a new method which could predict fractured horizontal gas wells′ productivity in low-permeability tight gas reservoirs rapidly,economically and efficiently.According to the geological characteristics of low-permeability tight gas reservoirs in China,single well′s simulation model has been established.Then a 8×16 orthogonal vector was set up and the processes of revision isochronal well test were simulated.The simulation results show that effective permeability and thickness of the reservoir are the most important two parameters among those which can influence the productivity of gas wells.At the same time,the results can be regressed to relationship equations between binomial deliverability equations′ factors (A and B) and formation capacity.The practical application shows that this method has convenient operation and reliable result,and is well-adopted,economical and time saving.Particularly,these productivity equations are suitable for field application.
LI Qin,CHEN Cheng，XUN Xiao-quan . A New Method of Predicting Gas Wells′ Productivity of Fractured Horizontal Well of Low-permeability Tight Gas Reservoir[J]. Natural Gas Geoscience, 2013 , 24(3) : 633 -638 . DOI: 10.11764/j.issn.1672-1926.2013.03.633
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