Analysis On The Development Effect Of Horizontal Well In X District Of Su Dongnan Gas Reservoir

The x-gas zone of Su Dongnan gas reservoir is a sandstone gas area with low porosity,low permeability,low abundance and buried depth.The gas zone has the characteristics of rapid pressure drop,difficult stable production,low reserve utilization and poor economic benefits.Therefore,this paper analyzes the comprehensive development effect of horizontal wells in the gas area.The horizontal wells of 67 wells with more than 500 days of completion in the study gas area are classified into three types according to the classification criteria of dynamic and static,and the later work will be carried out around the horizontal wells of three types of wells.Based on the production capacity evaluation and single well control reserve evaluation of horizontal wells,the reasonable production allocation analysis and decline law of horizontal wells are analyzed and predicted respectively.In addition,the factors influencing the production capacity of horizontal wells are analyzed systematically.Through a series of research,the development effect of horizontal well in gas well in this gas zone is analyzed systematically.The conclusions are as follows:1.According to the gas test data of horizontal well,the productivity evaluation of the modified isochronic well test method,the traditional "single point method" productivity test formula and the improved "single point method" productivity test formula are carried out.The accurate test conditions of the calculation results by using the improved "single point method" productivity test formula are analyzed,namely,single well α The improved formula corresponding to the value is below 85% of the return pressure ratio of the gas well;The factors influencing capacity are analyzed.2.The critical fluid carrying flow method,gas production index curve method and field production statistics method are used to analyze the reasonable production allocation of horizontal wells of various gas wells,and determine the reasonable working system of horizontal wells.3.The single well control reserves of various horizontal wells are calculated by using the method of flow material balance and modern production decline.The results are reliable and the distribution of controlled reserves and remaining reserves of gas wells is analyzed.4.The paper uses ARP’s traditional decline curve to determine the decline type of horizontal wells in the research area,calculates the initial decline rate,determines the production prediction equation and cumulative gas production prediction equation of all kinds of horizontal wells,and evaluates the life cycle and production degree of gas wells.The results show that the results of the two methods are not different.This paper provides theoretical support for the study of gas zone reasonable and efficient development by analyzing the development effect of horizontal well in the X gas zone in Su Dongnan Province.