| Production performance analysis has great significance to the development of gas reservoir,which has different contents in different development stages.After years of development,Luodai gas field is now in the late stage of gas reservoir development.Most gas wells have relatively low gas production and wellhead pressure,and the controllable drawdown pressure is limited,which are facing the situation that the wellhead pressure is close to the pipe network pressure,and there is no room for improvement of drawdown pressure under conventional production measures.Therefore,the focus of production performance analysis of this gas reservoir should be focused on the implementation of remaining recoverable reserves and the evaluation of the implementation effect of the corresponding gas recovery process,which can provide reference for the adjustment of development policies and the application of corresponding production measures,and improve the recovery rate of gas wells in Luodai gas field.Based on a large number of literature research and analysis,combined with the regional geological characteristics and dynamic and static data of Luodai gas field,this paper will analyze the production performance and the process of Luodai gas field.The main research work of this paper is as follows:(1)Set up the computational model of bottomhole flowing pressure by analyzing the flow rule of the gas in the wellbore and the conservation of energy principle.(2)Established a new method for calculating formation pressure by mathematical transformation in combination with field practice,based on material balance method and productivity binomial method.(3)Analyzed the fundamental principles and adaptability of the conventional computational method of gas reservoir dynamic reserves.(4)Established three kind of new methods for dynamic reserves calculation applicable for Luodai gas field by improving the conventional dynamic reserves calculation method with the help of multi?objective optimization method.Each of the new methods has been verified and analyzed by example calculation.(5)Dynamic analysis of production in Luodai gas field.Based on the production performance data of Luodai gas field,the development situation and production characteristics of Penglai and Suining gas reservoirs in Luodai gas field are summarized and analyzed.The residual dynamic reserves of more than 200 wells in two main gas reservoirs in Luodai gas field are calculated by using the established reservoir formation pressure calculation method and dynamic reserves calculation method.(6)Analyzed the supercharging production technology in Luodai gas field.Through the above research,the following conclusions and recommendations are drawn:The Luodai gas field is already in the late stage of gas reservoir development,Most of the gas wellhead pressure is close to the pipe network pressure,and the gas well production capacity is seriously affected by the pressure of the pipe network;Through the calculation of dynamic reserves of gas wells,it is shown that although some gas wells are already in the low-pressure and low-yield stage,they still have industrial exploitation value,These gas wells should actively take corresponding measures to prolong the production time and improve gas recovery;The supercharged production of gas wells can further increase the yield of low-pressure gas wells,which can improve the gas production of gas wells due to the influence of pipe network pressure or stop production;In addition,the implementation of supercharged mining in gas wells can further increase the production pressure difference,and improve the liquid carrying capacity of gas wells,and improve the effusion of gas wells and further prolong the stable production time of gas wells;Through research and analysis,the well selection principle of supercharged mining technology is obtained,and then the gas wells in Luodai gas field are screened.This part of the gas well should actively monitor it and take timely measures to stabilize the production of gas wells. |
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