关于气井产能、气田稳产特征和气区开采潜力的探讨

根据气田开发特点和国内外开发实践，对气田平均产能评价方法、开发速度与稳产的关系以及气区开采潜力等问题进行了探讨，以提高开发评价、开发建设及投资决策的科学性与可靠性，达到高效开发和稳定供气的目的。分析评价了国内外常用的6种气井产能评价方法，指出了其适用条件。利用中国、土库曼斯坦和俄罗斯部分开发历史较长的气田开发实例分析了开发速度与稳产的关系，结果表明四川裂缝系统稳产情况最好，而土库曼斯坦气田稳产关系最差。利用俄罗斯已枯竭老气区、正在开发的大型主力气区以及中国四川开采历史较长气区的开发实例，对气区开采潜力进行综合分析和探讨，认为在预测气田（或气区）的开发潜力、稳定供气水平和年限时，要全面评价、预计尚未探明储量的规模、质量、投产时间、投产顺序以及储量的可信度和可靠性，以降低开发决策的风险，提高中、长期开发规划的科学性。图5表2参10

Discussion on gas well productivity, gas field plateau and gas area development potential

Based on the gas field development characteristics and the domestic and abroad practices,some development-related aspects,such as evaluation methods for gas field average productivity,the relationship between development rate and production plateau,and the development potential of gas area,are discussed in order to improve the scientificity and reliability of development evaluation,infrastructure construction and investment decision,and finally achieve the goal of high efficient development and long-term stable gas supply.Six worldwide-used formulae and their applicability are evaluated.The relationship of development rate and production plateau is analyzed using some cases of gas fields with long development histories in China,Turkmenistan,and Russia,showing that from the plateau viewpoint,the fractured gas fields in Sichuan are the best,while the gas fields in Turkmenistan the worst.The gas development potential is comprehensively analyzed based on the facts of depleted and major developing gas areas in Russia and of the gas area of relatively long history in Sichuan,China.When predicting the development potential,supply stability and duration of gas fields(areas),a comprehensive evaluation and forecast which takes into account scale,quality,the timing and sequences of production,the creditability and reliability of the unproved OGIP should be carried out so as to lower the risk of development decisions and improve the scientificity of the medium-and long-term development planning.