基于水露点分析的气田集气站注醇量优化——以子洲气田集气站为例  

Optimization of amount of methanol injection in gas gathering station based on water dew point analysis:A case of gas gathering station of Zizhou gas field

作　　者：张益[1,2] 沈磊 田喜军 胡均志 刘鹏 Zhang Yi;Shen Lei;Tian Xijun;Hu Junzhi;Liu Peng(School of Petroleum Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Key Laboratory of Oil and Gas Special Stimulation Technology in Shaanxi Province,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Petroleum Technology Research Institute of Changqing Oilfield Company,CNPC,Xi'an,Shaanxi 710079,China;No.2 Gas Production Plant,Changqing Oil Field Branch,CNPC,Xi'an,Shaanxi 710200,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]西安石油大学陕西省油气田特种增产技术重点实验室,陕西西安710065 [3]中国石油长庆油田分公司油气工艺技术研究院,陕西西安710079 [4]中国石油长庆油田分公司第二采气厂,陕西西安710200

出　　处：《油气藏评价与开发》2018年第5期60-63,共4页Petroleum Reservoir Evaluation and Development

基　　金：国家自然科学基金"基于采动影响条件下煤层气数值模拟方法研究"(51404196)

摘　　要：天然气通过集气站输送过程中,温度、压力等环境条件不断变化,易出现水合物,造成管线堵塞,影响天然气正常的输送,解决问题的做法是通过集气站时注醇。结合子洲气田集气站采用"小站常温分离、湿气气相输送、处理厂集中脱烃脱水"的工艺模式,为了确定合理注醇量、优化注醇制度,首先,根据各级分离器进、出口处天然气水露点测量值和所在部位环境温度对比判断是否需要注醇。对于需注甲醇时,将测量的各级分离器和管输接收端天然气水露点与对应的环境(管道)温度之间的最大差值作为需要优化的最大温差值。接着,利用行业标准露点修正图版建立了露点修正模型。最后,基于需优化的最大温差值,利用注醇量和温度修正值的关系对比确定子洲气田集气站最佳甲醇注入量。所得甲醇注入量既可有效抑制水合物形成又可节约成本。最终形成适合子洲气田集气站不同季节甲醇注入推荐表,可用于指导集气站生产。During the transportation of the natural gas gathering station,due to the constantly change of the temperature and pressure,it is easily to occur the hydrate,resulting in the clogging of the pipeline and affecting the normal transportation of natural gas.The main way is injecting the methanol when the natural gas by the gathering station.According to the situation of Zizhou gas gathering station,we used the process model of"the separation at room temperature in small station,transportation as moisture vapor,and concentrated dehydrocarbon and dehydration in processing plant".In order to determine the reasonable methanol injection quantity and optimize the methanol injection system,firstly,we measured and compared the water dew point and the ambient temperature of the natural gas at the inlet and outlet of the separator at each level to determine whether methanol injection is needed.If the methanol was needed,we would take the maximum difference calculated between the gas dew point at each stage of the gas separator and receiver,and the corresponding ambient(pipeline)temperature as the maximum temperature difference that need to be optimized.Then,we used the industry standard dew point correction chart to establish the dew point correction model.Finally,based on the maximum temperature difference to be optimized,we determined the optimum methanol injection amount by the correlation analysis between the methanol injection volume and the temperature correction value in the gas gathering station of Zizhou gas field.The obtained methanol injection volume can effectively inhibit the formation of hydrate and save the cost.The final recommended table for methanol injection volume suitable for the gas gathering station in Zizhou gas field can be used to guide the production.

关 键 词：注醇量优化 集气站 水露点 天然气水合物 温度修正 

分 类 号：TE866[石油与天然气工程—油气储运工程]