苏里格气田压力敏感性分析及对气井动态影响研究

苏里格气田是典型的低渗砂岩气藏,储层岩石孔隙结构复杂,具有明显压敏特征;目前气井采用控制产量和放压生产2种方式,其动态特征差别较大,对压敏条件下气体渗流机理及其对气井产能的影响认识不清,2种生产方式对气井开采效果的影响有待进一步评价。在岩心实验分析的基础上,通过储层压力敏感性评价,建立压敏条件下气井渗流方程,定量评价压敏条件下气井产能特征,并结合实际动态资料,修正渗透率压敏参数,分析预测气井开发后期生产动态,量化对比不同生产方式下压敏对气井开采效果的影响,优化配产,提升气田开发水平。

Analysis and Research on the Pressure Sensibility of Sulige Gas Field and Its Influences on the Dynamics of Gas Wells

Sulige gas field is the typical reservoir of low permeable sand rock,with the complex space structure of layer rocks,and the obvious feature of pressure sensibility.At present,gas fields adopt two production modes of controlling the output and releasing pressure.Since there is large difference between the dynamic features of both modes,gas fields cannot clearly understand the principle of gas permeable flow and its influence on gas well productivity.So it is necessary to make the further evaluation on the influence of two production modes on the exploitation efficiency.Based on the analysis of rock core experiment,through the evaluation on the pressure sensibility of reservoir layers,the permeability flow formula of gas well under the condition of pressure sensibility has been established in this paper,followed by the quantitative evaluation on the productivity feature of gas wells under the pressure sensibility.Meanwhile,combined with the practical dynamic data,the pressure sensibility parameter of permeability has been revised,together with the analysis and prediction of production dynamics during the post production of gas well exploitation.In addition,the quantized contrastive analysis is focused on the influences of pressure sensibility on the exploitation efficiency under the different production modes in order to optimize the allocation and improve the level of gas field exploitation.