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储层特征和损害机理研究表明，先天不足和极大的损害潜力在川西裂缝性致密砂岩气藏中得到集中体现。经过十几年不懈探索，川西致密气层保护与改造技术获得重大突破，基本形成过平衡水基工作液体系的配套工艺技术系列。实践进一步明确了致密气地层损害控制的三个原则：①气层保护与气层改造并举；②气层保护以裂缝为重点，兼顾基块；③以效益为中心，实现三个有利于。为适应川西致密气藏立体勘探开发形势，提出要逐步形成适合于不同压力系统、不同井眼轨迹、不同流体体系的配套技术系列。指出现阶段要在完善过平衡水基工作液体系基础上，发展“火攻气层”技术，与现行过平衡水基体系相结合。气体类工作流体及配套工艺技术将成为下一世纪致密气开发的主导技术，应不失时机地做好技术储备。强调必须用非常规的地质和工程技术思路，解决非常规致密砂岩气藏中的关键问题

Strategy for Controlling Formation Damage in the Course of Well Completion in the Gas-bearingTight Sandstone in West Sichuan

Tight sandstone gas is becoming a vital new force in the aspects of oil and gas reserve increase and energy supply in the world.The main strong countries in oil and gas production have uninterruptedly obtained a technical superiority in the exploration and development of tight gas and the matching technology has had an embryonic form.The tight gas in west Sichuan region is of considerable characteristics in China because of its long exploration and development history and relatively advanceAuthor d researching work and technical level.The research on the reservoir feature and damage mechanism shows that the congenital defect and extremely great damage potentiality are embodied in the fractured tight sandstone gas reservoir in west Sichuan.Through and unremitting exploration for more than ten years,and important breakthrough in the protection and reformation technique for the tight gas reservoirs in west Sichuan has been made and a series of the matching technologies for overbalanced waterbase operating fluid system has been basically formed.Through practice,the three principles for controlling tight formation damage have been further definited,that is:employing both gas reservoir protection and its reformation;taking fracture as the focal point and giving consideration to matrix for protecting gas reservoir;taking benefit as the center.To suit to the threeD exploration and development of tight gas reservoir in west Sichuan,it is pointed out that a series of matching techniques suiting to different pressure system,different well track and different fluid system should be formed step by step.In present period,on the basis of perfecting overbalanced waterbase operation fluid,combining the development of in situ combustion with current overbalanced waterbase system must be carried out.The gaseous operation fluid and its matching technologies will become a dominant technique for developing tight gas in the next century and the proparation of the technique must be made in opportune time.The authors emphasize using train of thought on unconventional geology and engineering technique to solve the key problems of unconventional tight sandstone gas reservoir.