有效控制乙二醇处理系统硬度值的升高,严格控制气井产水和及时调整优化乙二醇处理系统十分重要。为了降低乙二醇处理系统硬度值,提高处理能力,保障深水海管的管输安全,对荔湾气田生产系统进行了整体分析。分析发现,硬度值升高的原因一方面是随着深水气井中地层水产出量逐步增大,乙二醇溶液吸收了含有大量钙镁离子的地层水;另一方面是大量钙、镁离子未能有效被乙二醇处理系统处理。现场通过合理优化出水气井产量、优选pH平衡溶液、提高一价盐系统处理量及颗粒过滤器滤布换型等多种举措,有效降低了乙二醇处理系统硬度值。研究结果可为后续开发生产的深水气田乙二醇处理系统在面对硬度值升高的情况时提供参考。

To effectively manage the hardness value of the ethylene glycol solution in the treatment system, it's imperative to rigorously control the water production of gas wells and make timely optimization adjustments to the ethylene glycol treatment system. To reduce the hardness value of ethylene glycol solution and enhance the processing capacity of its treatment system and the flow assurance of deep water pipeline operations, a comprehensive analysis of the Liwan deep water gas field's production system was conducted. This analysis revealed that the escalating hardness value resulted from the increasing production of formation water from deep water gas wells. This water, rich in calcium and magnesium ions, was absorbed by the ethylene glycol solution. At the same time, the ethylene glycol treatment system was not able to effectively treat these highly concentrated ions. Implementing on-site measures, such as optimizing the production rate of these gas wells with water breakthrough, careful selection of the pH balance solution, enhancing the monovalent salt system's treatment capacity, and selecting different type of particle filter socks, the hardness value of ethylene glycol solution in the treatment system was successfully reduced. The results of this study provide a reference for the subsequent development and production of deep water gas field ethylene glycol treatment systems when facing the problem of increased hardness value.