| The Lower Paleozoic gas reservoir in Jingbian gas field is a typical large carbonate gas field with low porosity,low permeability and low abundance in China.After decades of development,it is at the end of natural stable production.Due to the characteristics of low matrix permeability and strong reservoir heterogeneity,there are many problems in gas field development,such as uneven production of reserves,low recovery rate,unclear understanding of final recovery rate and its influencing factors,etc.Therefore,this paper takes Shan37 well area in the middle of Jingbian gas field as the research object,on the basis of geological research and three-dimensional geological modeling,comprehensively uses gas reservoir engineering methods and numerical simulation technology,carries out the gas reservoir recovery rate prediction and its influencing factors research,determines the main controlling factors and puts forward targeted technical countermeasures for improving the recovery rate.The prediction results of recovery ratio show that the final recovery ratio is 52.91% with the existing well pattern and mining method.Through the correlation analysis between different factors and recovery ratio,it can be concluded that the degree of well pattern control is the main factor affecting recovery ratio,and reservoir physical properties and abandonment pressure are secondary factors.At the same time,according to the analysis results of main control factors and on the basis of reservoir production potential analysis,four sets of small layer production technical schemes are designed,with well pattern encryption as the main and reservoir reconstruction as the auxiliary.According to the prediction results of the scheme effect,considering the current development technical conditions,economic costs and various risks,the specific scheme implementation suggestions are put forward,which can provide reference for the development of similar gas reservoirs. |
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