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凝析气藏衰竭开采过程中,受相态变化影响,在近井带地层将形成反凝析液堆栈和井筒积液。井筒积液在井筒回压、岩石润湿性及微孔隙毛管压力作用下将产生反渗吸水锁效应,造成地层渗流通道的堵塞,从而引起气井产能下降,特别是对低渗凝析气井影响更大。在分析了反凝析、反渗吸地层伤害机理和国内外现有降低和解除反凝析、反渗吸堵塞技术方法的基础上,针对低渗凝析气藏,建议采用一种有效的解除凝析气藏近井地层反凝析、反渗吸堵塞,提高气井产能的技术方法:即在注气吞吐之前注入一个甲醇(乙醇、表面活性剂)溶液前置段塞来有效地解除反凝析特别是反渗吸水锁效应所产生的地层伤害和堵塞。
During the process of depletion and recovery of condensate gas reservoirs, the retrograde condensate stack and wellbore fluid will form in the strata near the wellbore due to the change of phase state. Wellbore fluid in the wellbore back pressure, rock wettability and micropore capillary pressure will produce reverse osmosis water lock effect, resulting in formation seepage channel plugging, resulting in decreased production capacity of gas wells, especially for low permeability condensate gas well more Big. Based on the analysis of the mechanism of retrograde condensate and reverse osmosis formation damage and the current domestic and foreign existing methods of reducing and eliminating the technologies of retrograde condensate and reverse osmosis, aiming at the low permeability condensate gas reservoir, Condensate gas reservoir near the well formation anticoagulation, reverse osmosis plug, increase gas production capacity of the technical methods: that is, before the injection of gas Huffman a methanol (ethanol, surfactant) solution before the slug to effectively lift the condensate Analyze stratigraphic damage and blockage caused by the reverse osmosis water lock effect in particular.