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目前凝析气井井筒压力计算仍在沿用常规气井的方法,由于对井筒相态考虑不充分,计算精度无法满足动态分析和生产管理的需求。本文从凝析气井井筒相态特性出发,结合井筒温度分布,以气液相平衡计算为基础,建立了凝析气井生产过程综合考虑井筒温度、相态变化的压力计算模型,运用隐式差分格式并结合具体实例对凝析气井生产过程井筒压力分布进行了研究和计算。从计算结果看,该方法考虑了井筒温度及相态变化,因而井底压力的计算结果与实际情况更接近,可以解决压力计无法下入产层中部或不能正常测试的问题,作为凝析气井压力测试的替代手段,在仅进行井口参数测量的情况下能够帮助完成凝析气井常规的生产动态分析工作,从而节省测试所需的大量人力、物力。
At present, the wellbore pressure calculation in the gas condensate gas well is still using the conventional gas well method. Because of insufficient consideration of the wellbore phase state, the calculation accuracy can not meet the requirements of dynamic analysis and production management. Based on the phase behavior of wellbore in condensate gas well and based on wellbore temperature distribution and gas-liquid phase equilibrium calculation, a pressure calculation model considering wellbore temperature and phase change is established considering the production process of condensate gas well. By using implicit difference scheme Combined with concrete examples, the wellbore pressure distribution in the condensate gas well production process was studied and calculated. From the calculation results, the method considers the wellbore temperature and phase change, so the calculation result of bottomhole pressure is closer to the actual situation, which can solve the problem that the pressure gauge can not enter the middle of the production layer or can not be tested normally. The alternative means of stress testing can help to complete the routine production dynamic analysis of condensate gas wells when only the wellhead parameters are measured, so as to save a lot of manpower and material resources required for testing.