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低渗气藏在已探明的天然气地质储量中占有相当大的比重。但低渗气藏的低产特征，使得这类气藏往往难以直接获得商业性开发利用，只有通过储层压裂改造才能达到经济开发要求。章根据气井压后流体渗流流动规律的变化，利用气藏的渗流理论，推导出气井压后稳态产能公式；并利用油藏数值模拟的方法，系统地分析了压裂缝长、导流能力、有效渗透率、有效厚度等对塔巴庙区块压裂初期产量大小和压后产量变化的影响，得到塔巴庙区块低渗气藏压裂井筛选原则和压裂设计参数。在做压裂选井时，应选择有效渗透率和有效厚度都较大的井进行压裂；在压裂设计时，应优选出合理的裂缝导流能力和裂缝缝长，从而为低渗气藏的高效开发提供科学决策。

The Steady-state Productivity Formula after Fracturing for Gas Wells and Fracturing Numerical Simulation

Low-permeability gas reservoirs account for high proportion in the proved gas reservoirs.But this kind of gas reservoirs has hardly commercial value directly.They can be developed and utilized economically only after fracturing.Based on the change of fluid flow rule after fracturing,using the percolation theory of gas reservoirs,the steady-state productivity formula of gas wells after fracturing is derived.Using reservoir numerical simulation,the influence of fracture length,conductivity,effective permeability and effective thickness on the early production and then production variety after fracturing is analyzed systematically for Tabamiao block.The criteria to choice fracturing wells and the fracturing designed parameters are offered for Tabamiao block in the article.To choice wells for fracturing,the wells with greater effective permeability and effective thickness should be targeted.In fracturing design,reasonable fracture conductivity and length should be determined.So the scientific decision can be made for efficient development of low-permeability gas reservoirs.