含气高含水率原油低温集输温度确定方法研究

Research on Determination Method of Low Temperature Gathering and Transportation Temperature of Dissolved Gas Crude Oil with High Water Cut

黑树楠 王坤 郑春星 缪建成 黄启玉

Shu'nan Hei Kun Wang Chunxing Zheng Jiancheng Miao Qiyu Huang

中国石油天然气集团有限公司，北京 100010 中国石油大学（北京） 油气管道输送安全国家工程实验室/城市油气输配技术北京市重点实验室，北京 102200 中国石油天然气股份有限公司规划总院，北京 100083 中石化江苏油田分公司 采油二厂，江苏 扬州 225000

China National Petroleum Corporation，Beijing 100010，China National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology，China University of Petroleum（Beijing），Beijing 102200，China PetroChina Planning and Engineering Institute，Beijing 100083，China The 2nd Oil Production Plant of Jiangsu Oilfield，Sinopec，Yangzhou Jiangsu 225000，China

黏壁温度作为普适性低温集输边界条件，其在高含水率开发后期的油田中得到了广泛推广及应用。当集输温度高于黏壁温度时，集输管线运行平稳；当集输温度低于黏壁温度时，绝大部分集输管线的压降显著升高，部分集输管线的压降变化不明显。现场降温试验结果表明，当集输管线进入计量间温度逐渐降低至凝点以下6、8、10、12 ℃时，井口回压存在运行平稳、小幅波动、低频大幅波动和高频大幅波动四个阶段的变化，且当集输温度过低时，集输管线内存在多次“再启动”过程。不同气油比条件下的现场集油管线掺气降温试验结果表明，当气油比分别为40、80、160 m3/t时，集输管线可以在进入计量间温度低于黏壁温度3、4、6 ℃的工况下进行低温集输。

As a universal low temperature gathering and transportation boundary condition,the wall sticking occurrence temperature (WSOT) has been widely promoted and applied in the oilfield in the late stage of high water cut development. When the oil gathering temperature is higher than the WSOT, the pipeline operates smoothly, otherwise the pressure drop of most pipelines increases significantly, but some of the pipeline pressure drop changes are not obvious. Through the field cooling experiment, it was found that in the process of the oil gathering temperature gradually decreasing to 6,8,10 ℃ and 12 ℃ below the gel point, the wellhead back pressure has experienced four stages of smooth operation, small fluctuation, low frequency large fluctuation and high frequency large fluctuation, and there are several "restart" processes in the pipeline when the gathering temperature is too low. At the same time, the gas injection experiment under different gas?oil ratio was further carried out, and the results show that when the gas?oil ratio is 40,80,160 m3/t, the pipeline can run stably at the gathering temperature 3,4 ℃ and 6 ℃ lower than the WSOT.

国家自然科学基金资助项目“含蜡原油常温输送机理及流动改性方法研究”(51534007);国家自然科学基金资助项目“油包水型乳状液蜡分子扩散和蜡晶颗粒沉积机理研究”(51374224)

10.12422/j.issn.1672-6952.2023.01.006