压缩机出口涤气罐降压排液流程优化改造实例
Example of Optimisation and Modification of Compressor Outlet Scrubber Tank Pressure Reduction and Discharge Process

本论文主要针对某平台湿气压缩机出口涤气罐排液流程为压缩机罐底排液至闭排罐，由此进行罐内液体回收。随着越来越多的需要降压的生产井进入降压流程，压缩机出口涤气罐排液也开始越发频繁，但由于出口涤气罐操作压力在4~4.5 MPa之间而闭排罐作为常压容器，两者之间存在巨大的压差，致使排液过程极易产生冰堵且排液调节阀也由此而产生内漏损伤，造成气体大量窜漏至闭排罐释放到火炬燃烧。其次作为出口涤气罐内压缩冷却后产生的凝析油密度低于正常原油，且易挥发，而平台闭排回收泵是标准离心泵，在回收闭排罐内液体时泵内的高温很容易使凝析油气化造成气蚀甚至气锁损坏闭排泵叶轮，降低离心泵的使用寿命。闭排罐作为下游的收集容器在台风期间远程模式中至关重要，一旦闭排罐满罐平台就必须关断防止出现火雨、溢油等危害平台安全的情况发生。针对以上问题，特提出出口涤气罐排液流程优化改造方案，解决现场生产难题。
This thesis focuses on a platform wet gas compressor outlet scrubber tank discharge process for the bottom of the compressor tank discharge to the closed discharge tank, thus to carry out the tank liquid recovery. With more and more production wells needing to be depressurized to enter the depressurization process, the compressor outlet polyester gas tank liquid discharge began to be more and more frequent, but due to the export of polyester gas tank operating pressure in 4~4.5 MPa and the closed tank as an atmospheric container, there is a huge difference in pressure between the two, the liquid discharge process is very easy to produce ice blockage and liquid discharge regulator valves are also produced as a result of the leakage of damage, resulting in a large number of gas leakage to the closed tank and releasing to the torch combustion. Secondly, the condensate produced after compression and cooling as an outlet gas cleaning tank is less dense than normal crude oil and volatile, while the platform closed-row recovery pump is a standard centrifugal pump, the high temperature inside the pump when recovering the liquid in the closed-row tank can easily make the condensate gasification caused by cavitation or even airlock damage to the impeller of the closed-row pump, reducing the service life of the centrifugal pump. Closed-discharge tank as the downstream collection container during the typhoon in the remote mode is critical, once the closed-discharge tank is full, platform must be shut down to prevent the occurrence of fire and rain, oil spill and other hazards to the platform safety situation. In view of the above problems, we put forward the optimization and transformation of the discharge process of the export polyester gas tank to solve the on-site production problems.