改进的分子筛脱水装置在页岩气脱水中的应用

页岩气开发过程中多在集气站进行脱水处理,工艺多采用三甘醇(TEG)脱水,但边远页岩气单井的开发需脱水后再进入外输管网。针对这类单井产气量小、工况不稳定等特点,若采用三甘醇脱水工艺,存在投资和运行成本增加、装置运行不稳定等问题。通过对重庆页岩气公司足202井的特点进行分析,综合比较了分子筛与三甘醇脱水装置的优缺点,并对工艺与设备进行了集成创新,提出了利用分子筛进行井口气脱水的新思路,研制出一套处理量为12×104 m^3/d的撬装分子筛脱水装置,并在现场进行了成功应用。分析结果表明,装置满足脱水需求,节省了投资和能耗。另外,装置在针对性和适用性上有许多亮点,在自动化和信息化方面进行了有益的尝试,可为类似天然气分子筛脱水系统的设计提供参考。

Application of improved molecular sieve dehydration unit in shale gas dehydration

During the process of shale gas development, dewatering is usually carried out in the gas collecting station, and the process is mostly with triglycol dehydration. However, the single well development of remote shale gas needs to be dehydrated before entering the pipeline network. In view of the characteristics of single well, such as small gas production capacity and unstable working conditions, if triglycol dehydration process is adopted, there will be problems such as increase of investment and operation cost, and unstable operation of the device. Through the characteristics analysis of Chongqing Shale Gas Company Zu 202 Well, comprehensive comparison of the advantages and disadvantages about the molecular sieve and the triglycol dehydration unit were carried out, and the integrated innovations of technology and equipment were carried, then the new idea of using molecular sieve for wellhead gas dehydration was proposed, and the skid-mounted molecular sieve dehydration unit with the capacity of 120,000 m³/d was developed, which had a successful application in the field. The results showed that the device could meet the demand of dehydration and save the investment and energy consumption. In addition, the device had many highlights in the pertinence and applicability, and it had made beneficial attempts in the aspects of automation and informatization, which could provide a reference for the design of similar natural gas dehydration system with molecular sieve.