气田小压差节流脱水工艺评价计算方法  

Evaluation and Calculation Method of Small Pressure Difference Throttling Dehydra⁃tion Process in Gas Field

作　　者：彭杰 PENG Jie(Petroleum Engineering Research Institute of North China Branch,SINOPEC)

机构地区：[1]中石化华北油气分公司石油工程技术研究院

出　　处：《油气田地面工程》2021年第2期27-31,共5页Oil-Gas Field Surface Engineering

基　　金：国家科技重大专项“低丰度致密低渗油气藏开发关键技术”(2016ZX05048)。

摘　　要：大牛地气田开发中期,在集气站应用了一种小压差节流脱水工艺,该工艺受到多种因素影响,系统性能难以定量测定及评价。通过连续测定天然气流经该系统的节流压差、流体温度、环境温度,拟合得到节流温降计算公式,可计算出该系统的固有温降系数以及与环境之间的热交换程度。利用该方法对大牛地气田29座集气站小压差节流脱水系统进行了测算,结果表明:各集气站换热器安装之后即形成了一套单独的节流脱水系统,该系统与环境之间存在显著换热,安装初期固有节流温降系数达到30℃/MPa以上。利用该公式实现了小压差节流脱水工艺系统的定量评价,并可用于指导换热器后续应用及维护工作。In the middle stage of Daniudi Gas Field development,a small pressure difference throttling dehydration process is applied in the gas gathering station.As the process is affected by many factors,it is difficult to measure and evaluate the system performance quantitatively.By continuously measuring the throttling pressure difference,fluid temperature and ambient temperature of natural gas flowing through the system,a throttling temperature drop calculation formula is obtained by fitting,which can calculate the inherent temperature drop coefficient of the system and the degree of heat exchange between the system and the environment.This method is used to calculate the small differential pressure throttling dehydration system of 29 gas gathering stations in Daniudi Gas Field.The results show that after the installation of heat exchanger in each gas gathering station,a set of independent throttling dehydration system is formed.There is significant heat exchange between the system and the environment,and the inherent throttling temperature drop coefficient at the initial stage of installation is more than 30℃/MPa.By using this formula,the quantitative evaluation of small pressure difference throttling dehydration process system is realized,and the subsequent application and maintenance of heat exchanger can be guided.

关 键 词：小压差节流脱水工艺 节流制冷 集气站 换热器 温降系数 

分 类 号：TE644[石油与天然气工程—油气加工工程]