海上凝析气田开发中后期存在的问题及技术对策——以平湖气田为例
Problems and Technical Countermeasures in the Middle and Later Development Stages of Offshore Gas Condensate Field: A Case Study of Pinghu Gas Field

通过对东海平湖气田衰竭式开发过程中存在的问题进行分析归纳，认为气井井口压力低迷、主力气井产量递减明显、高产水气井贡献微弱等是制约目前气田稳产的主要因素。由于气田已经处于开发中后期，绝大多数气井的井口压力已经接近平台流程压力，针对气井井口压力低迷的问题，提出了单井流程降压技术以及平台流程降压技术；针对高产水气井贡献微弱的问题，提出了气举阀排水采气以及油管穿孔排水采气技术。实际矿场应用效果表明，流程降压技术以及排水采气技术应用效果较好，是海上凝析气田开发中后期保产稳产的主要技术手段。
By analyzing the existing problems in the depletion development of Pinghu gas field in the East China Sea, it has been concluded that the main factors that restrict the stable production of gas field at present are the low wellhead pressure of gas well, the process depressurization of main gas wells, and the weak contribution of high-yield water and gas wells. As the gas field is in the middle and later stage of development, the wellhead flowing pressure of majority gas wells has been close to the platform process pressure; therefore, the single well pressure reduction technology and platform process pressure reduction technology are proposed. In terms of the weak contribution of high-yield water gas wells, technology of drainage with lift valve and tubing perforated gas-lift drainage is put forward. The good field application results show that the process depressurization and drainage gas production are the main technical means to ensure the production in the Middle and Later Development Stages of offshore Gas condensate field.