Abstract
The prediction and evaluation of reservoir productivity is a comprehensive index of the dynamic characteristics of gas reservoirs, which can provide a reasonable basis for the design and rational distribution of gasfield development plan. Proration of gas well is an important procedure in the development process, Absolute open flow as a key indicator of rational production of gas well. It is very important to determine the absolute open flow of the gas well. The Permian in Ordos Basin is a typical tight sandstone gas reservoir. The paper analyses correlation relations between different logging parameters and absolute open flow, and get the four parameters, porosity, permeability, storage coefficient（the product of porosity and effective thickness）with better correlation relations and effective thickness with best correlation relation by combining a large amount of gas logging data and static logging data and means of linear regression analysis, Then on the basis of this, a new empirical formula for calculating the absolute open flow of gas wells is obtained by using the method of multiple linear regression. The example shows that the result of this method is reasonable and reliable and the method can provide scientific basis for the prediction of natural gas absolute open flow of tight sandstone gas reservoirs.
Highlights
Tight sandstone gas reservoir is an important component of unconventional oil and gas in our country at present, which has great exploration and development potential (Kang et al, 2016)
The absolute open flow rate is considered as an important parameter to evaluate the productivity of gas wells
The results shows that the combination of logging parameters in an appropriate way can improve the correlation with the absolute open flow
Summary
Tight sandstone gas reservoir is an important component of unconventional oil and gas in our country at present, which has great exploration and development potential (Kang et al, 2016). The absolute open flow rate is considered as an important parameter to evaluate the productivity of gas wells. The absolute open flow rate is an important parameter to evaluate the productivity of gas well. It is usually calculated by means of systematic well test, isochronal test, modified isochronal test, single point test and other productivity test methods (Gou, 2004, 2005). The production capacity test theory requires that the gas well test reach a stability condition. The productivity equation and the absolute open flow rate error of the heterogeneity low permeability gas well are determined, and the tight sandstone gas reservoir with low porosity and low permeability reaches the pressure stability. Different work system will inevitably affect the production of gas wells in the process
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