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石油与天然气化工
CHEMICAL ENGINEERING OF OIL GAS
克拉气田某处理厂干气烃露点问题的探讨
高莉蒋洪西南石油大学
2017
摘要克拉气田某处理厂采用三甘醇脱水工艺对原料气进行脱水处理，脱水后的干气水露点合格，但烃露点较高。由于天然气具有反凝析现象，随着干气在输送过程中压力的降低，会有液态烃析出，从而对管道、设备、下游用户造成不同程度的危害。为了达到合格的烃露点，避免液态烃的析出，根据我国国家标准对烃露点的不同规定，提出了烃露点控制的改进流程及两种烃露点的控制方案。使用 HYSYS软件进行模拟比较，确定采用GB17820一2012《天然气》对天然气烃露点的控制要求，以保证处理厂至轮南首站的外输管线内无液态烃析出。同时，对气气换热器和低温分离器进行初步选型，并提出了反凝析现象的控制措施。
关键词克拉气田烃露点反凝析现象改进流程
中图分类号：TE645
文献标志码：A
D0I:10.3969/i.issn.1007-3426.2017.02.005
Discussion ontheproblem of hydrocarbon dew point of dry
gas of a processing plant in Kela Gas Field
Gao Li, Jiang Hong
Southwest Petroleum Unirersity, Chengdu, Sichuan, China
Abstract : The processing plant in Kela gas field uses triethylene glycol (TEG) dehydration process for the sweet gas dehydration . The water dew point of dry gas after TEG dehydration is up to standard but hydrocarbon dew point is higher . As the natural gas has retrograde condensation phenomenon, there will be liquid hydrocarbon precipitation with the decrease of dry gas pressure during the process of transportation , which will do harm to the pipeline , equipment and downstream users to some extent. In order to realize the qualified hydrocarbon dew point and avoid the precipitation of liquid hydrocarbon , the improved process of hydrocarbon dew point control and two kinds of control schemes about hydrocarbon dew point were proposed according to the different rules of Chinese national standards . For ensuring no liquid hydrocarbon in outer transmission pipeline of the processing plant to the initial station in Lunnan , the control requirement of natural gas hydrocarbon dew point was determined to adopt GB 17820—2012 Natural Gas by using HYSYS to simulation and comparison .Meanwhile, the model selection of gas-gas heat exchanger and low temperature separator were achieved , and the control measures of retrograde condensation phenomenon were put forward .
Key words:Kela gas field,hydrocarbon dew point,retrograde condensation phenomenon, improvedprocess
作者简介高菊(1992一），山东潍坊人，西南石油大学石油与天然气工程学院在读硕士研究生，主要从事油气集输与处理方面的研究工作尽数：gaoli0226@163.com