低含水阶段含蜡原油不加热集油温度下限确定  

Determination of the lower limit of unheated oil gathering temperature for waxy crude oils in the low water content stage

作　　者：熊建华[1] 段志刚[1] 陈剑峰 于乐 康玉阳 孙韶峰 秦远智 黄启玉 XIONG Jianhua;DUAN Zhigang;CHEN Jianfeng;YU Le;KANG Yuyang;SUN Shaofeng;QIN Yuanzhi;HUANG Qiyu(Jiangsu Oil Field Bureau,SINOPEC,Yangzhou 225009,Jiangsu,China;Changqing Oilfield Shale Oil Development Branch,PetroChina Company Limited,Qingyang 745000,Gansu,China;College of Mechanical and Storage Engineering,China University of Petroleum(Beijing)/National Engineering Laboratory of Oil and Gas Pipeline Transportation Safety/Beijing Key Laboratory of Oil and Gas Transmission and Distribution Technology,Beijing 102249,China)

机构地区：[1]中国石油化工股份有限公司江苏油田分公司,江苏扬州225009 [2]中国石油天然气股份有限公司长庆油田页岩油开发分公司,甘肃庆阳745000 [3]中国石油大学(北京)机械与储运工程学院/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,北京102249

出　　处：《化工进展》2024年第S01期255-267,共13页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金重点项目(51534007);国家自然科学基金面上项目(51374224)。

摘　　要：油田开发初期,井口采出液含水率较低,管流在集输过程中极易形成W/O乳状液,当集油温度降低时,蜡分子析出,凝油大量黏附积聚在管道内壁,导致井口回压升高,严重时可能会发生堵管等事故,对降温输送产生了巨大阻碍。因此针对低含水阶段含蜡原油开展不加热集油温度下限研究,本文提出不加热集输温度边界条件判定方法,对于开发初期油田不加热集输工艺的开展具有重要意义。利用室内可承压模拟罐装置进行了低含水含蜡原油粘壁实验,对低含水阶段含蜡原油的粘壁规律进行了分析,确定了凝点、含水率、剪切速率是影响粘壁温度的主要因素,建立了低含水阶段含蜡原油不加热集输粘壁温度预测模型,利用油田现场环道实验装置进行了验证,误差在2℃范围内,满足工程运用需求。At the early stage of oilfield development,the water content of wellhead extractive fluid is low,and the tubing flow is very easy to form water-in-oil(W/O)emulsion in the process of gathering and transporting.When the temperature of oil gathering is lowered,the wax molecules are precipitated,and a large amount of condensate adheres and accumulates on the inner wall of the tubing,resulting in the increase of back pressure at the wellhead.And in serious case,accidents such as plugging of the tubing may occur,which are a great obstacle to the cooling down and transporting.Therefore,it is of great significance to study the lower limit of unheated oil gathering temperature for waxy crude oil in the low water content stage and put forward the method of determining the boundary condition of unheated gathering temperature for the unheated gathering process in the early stage of oilfield development.The indoor pressure simulation tank device was used to carry out wall-sticking experiment of waxy crude oil in the low water content stage,wall-sticking law of waxy crude oil in the low water content stage was analyzed,and it was determined that the freezing point,water content,and shear rate was the main factors affecting the sticking wall temperature.An wall-sticking temperature prediction model for waxy crude oil in the low water content stage unheated gathering and transportation was established,which was verified by the oilfield field ring road test device,and the error was within 2℃,which met the requirements of engineering application.

关 键 词：低含水阶段 油包水乳状液 不加热集输 粘壁温度 

分 类 号：TE832[石油与天然气工程—油气储运工程]