新疆克深2气田处理装置结蜡问题研究及对策
Research on wax problem of natural gas processing unit in Xinjiang Keshen 2 gas field and its countermeasures
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- 引用格式:
-
许爱华,谭建华,张保书,张靖,刘文伟.新疆克深2气田处理装置结蜡问题研究及对策[J].天然气与石油,2021,39(1):49-55.doi:10.3969/j.issn.1006-5539.2021.01.008
XU Aihua, TAN Jianhua, ZHANG Baoshu, ZHANG Jing, LIU Wenwei.Research on wax problem of natural gas processing unit in Xinjiang Keshen 2 gas field and its countermeasures[J].Natural Gas and Oil,2021,39(1):49-55.doi:10.3969/j.issn.1006-5539.2021.01.008
- DOI:
- 10.3969/j.issn.1006-5539.2021.01.008
- 作者:
- 许爱华，谭建华，张保书，张靖，刘文伟
XU Aihua, TAN Jianhua, ZHANG Baoshu, ZHANG Jing, LIU Wenwei
- 作者单位:
- 中国石油塔里木油田公司
PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China
- 关键词:
- 克深气田;脱水脱烃;天然气脱蜡;低温分离;全组分分析;结蜡
Keshen gas field; Dehydration and Hydrocarbon dew-point control; Natural gas dewaxing; Low temperature separation; Full spectrum of component analysis; Wax deposition
- 摘要:
- 疆克深2气田处理厂天然气脱水脱烃采用常见的“注乙二醇”+“J-T阀节流制冷”低温冷冻分离工艺,投产初期出现JT阀卡阻、低温分离器工作异常等问题,从而导致乙二醇分离异常,并混入商品气中,下游管线在通球时,导致西气东输首站压缩机因乙二醇溶液停机,严重影响西气东输平稳供气。通过试运和实验室分析,排除水合物堵塞影响,判定JT阀卡阻是由于天然气中蜡组分在低温处理时析出,对克深处理厂原料气进行取样全组分分析,探索蜡组分在天然气处理中的分布规律,采用UniSim Design和HYSYS软件模拟,通过实验室溶蜡试验,发明了一种天然气脱蜡工艺,利用“相似相溶”原理,采用溶蜡剂吸收天然气中的蜡组分,解决了低温分离结蜡问题。该研究结果可为探索天然气中蜡组分状态分布规律和气田防蜡提供借鉴。
The “glycol injection” + “J-T valve throttling refrigeration” cryogenic freezing process is adopted as the natural gas dehydration and hydrocarbon dew-point control process at Xinjiang Keshen 2 gas feild. In the initial production stage, the J-T valve was blocked and the low temperature separator was` functioning abnormally,As a result,glycol was carried over intocommercial natural gas and resulted in the compressor shut-down at the first station of the West-to-East Natural Gas Transmission Pipeline. This problem had a serious impact on the stable gas delivery to downstream customers. Via trial run and laboratory analysis, it is found that, instead of hydrate blockage, wax precipitation under low temperature processing is the cause of J-T valve’s blockage. By taking the feed gas sample from Keshen treatment plant, full spectrum of hydrocarbon components is analyzed and the distribution rule of wax component is discovered. Through simulation using UniSim Design and HYSYS software, and performing wax dissolution experiment inthe laboratory, a new natural gas dewaxing process is devloped. This new process adopts wax solvent to absorb wax component from natural gas based on “like dissolves like” principle. The research results can resolve the wax deposition problem under low temperature processing and provide reference for exploring the wax component distribution rule in natural gas and wax prevention and management in natural gas field.
