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钻井方式的不同会对凝析气藏动态产生重要影响,气体钻井由于极低的井底压力易引起反凝析行为的发生,开展凝析气藏反凝析行为及其对储层影响的研究具有重要意义。为此,分析了气体钻井过程环空压力分布及地层压力变化,气体钻井过程地层的反凝析行为,以及反凝析对压井完井过程储层的影响。结果表明,凝析气藏气体钻井时,地层中会发生反凝析和蒸发现象,反凝析区域随钻进过程逐渐由井筒向地层扩展;反凝析行为可使地层在后续压井完井过程中形成混相乳化带和纯油相带,通过润湿反转作用改变毛细管力方向并产生液阻效应,可在一定程度上抑制工作液侵入地层产生损害。
Different drilling methods will have a significant impact on the dynamic condensate gas reservoir, gas drilling due to very low bottom hole pressure easily lead to the occurrence of anti-condensation behavior, to carry out condensate gas condensate anti-condensation behavior and its impact on the reservoir It is of great significance. Therefore, the distribution of annulus pressure and the change of formation pressure in gas drilling process, the anticoagulation behavior of gas formation in formation during gas drilling and the effect of retrograde condensate on reservoir during well completion are analyzed. The results show that anticorrosive and evaporative phenomena occur in the formation during gas drilling in condensate gas reservoirs, and the reverse condensing zone gradually expands from the wellbore to the formation as the drilling progresses; The formation of mixed phase emulsifying zone and pure oil phase belt can change the direction of capillary force and produce liquid resistance effect through the wetting reversal action, which can inhibit the infiltration of working fluid into the formation to a certain extent.