复兴高含蜡页岩油冷输集输工艺关键参数确定  

Determination of key parameters for gathering and transmission process of Fuxing highly waxy shale oil at low temperatures

作　　者：王欣 陶敏峰 俞徐林 王俊磊 黄启玉 谢成杰 梁艳 WANG Xin;TAO Minfeng;YU Xulin;WANG Junlei;HUANG Qiyu;XIE Chengjie;LIANG Yan(Sinopec Petroleum Engineering Jianghan Co.Ltd.;College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing))

机构地区：[1]中石化江汉石油工程设计有限公司 [2]中国石油大学(北京)机械与储运工程学院

出　　处：《油气储运》2024年第7期809-818,共10页Oil & Gas Storage and Transportation

基　　金：中国石油化工集团有限公司重大科技专项子课题“高含蜡页岩油高效开发地面工程关键技术”,JP22082。

摘　　要：【目的】中国石化复兴地区含凝析气轻质页岩油具有凝点高、含蜡量高的特点,易凝易结蜡。随着页岩油气生产时间增加,油井产量、含水率显著下降,加之油区自然条件差、高程落差大等不利因素,给页岩油气冷输(析蜡点以下)集输工艺带来巨大技术挑战。【方法】在分析复兴含蜡页岩油基础物性的基础上,研究低温流动条件下的油品黏度、屈服应力变化规律及含蜡页岩油乳化特征,揭示页岩油低温流动特性。分析集输工艺过程热处理温度、含凝析气及剪切作用等因素对页岩油凝点的影响,并探究不同含水率、不同溶气压力下的油品粘壁规律,得到影响管道安全输送的关键基础数据。【结果】复兴高含蜡页岩油为乳化能力较弱的轻质油,无法形成含水率大于20%的稳定乳状液,其黏度相对较低。热处理温度与剪切作用对该油品凝点几乎无影响,但油中轻组分的挥发性对凝点有很大影响,轻组分挥发会导致凝点大幅上升5℃。临界粘壁温度随含水率升高呈下降趋势,变化范围为13~18℃。随着溶气压力增加,低温流动条件下页岩油粘壁温度与黏度降低,流动性变好。冷输集输管道终点温度应高于临界粘壁温度,因此确定复兴高含蜡页岩油冷输集输终点最低温度为18℃,终点压力应不低于1.0 MPa。【结论】研究成果可为复兴地区高含蜡页岩油冷输集输工艺提供数据支撑,对高效开发非常规油气资源具有重要意义。[Objective]Condensate gas-containing light shale oil extracted by Sinopec in the Fuxing area features high solidification points and wax contents,indicating susceptibility to condensation and wax precipitation.With the progression of shale oil and gas production,there has been a notable decline in the oil well output and water cut.Coupled with unfavorable natural conditions and substantial elevation differences in the oil area,the operational landscape presents significant technical hurdles in gathering and transmitting shale oil and gas at low temperatures,particularly below the wax precipitation point.[Methods]Following an analysis of the basic physical properties of Fuxing waxy shale oil,this study delved into its viscosity and yield stress variations under low-temperature flow conditions,alongside its emulsification characteristics.These investigations shed light on the flow behaviors of shale oil at low temperatures.Subsequent analysis highlighted the influences of various factors including heat treatment temperatures,condensate gas contents,and the shearing effect on the solidification point of shale oil during the gathering and transmission process.Additionally,the study examined the wall sticking behaviors of oil with different water cuts and dissolved gas pressures.And,the main parameters affecting the flow assurance of flowline are outlined.[Results]Fuxing highly waxy shale oil,characterized as a light oil with low emulsification performance,encountered challenges in forming a stable emulsion with a water cut exceeding 20%,despite its low viscosity.Its solidification point remained relatively unaffected by heat treatment temperature and shearing.Instead,the volatility of light components significantly impacted the solidification point,leading to a notable 5 C increase due to the volatilization of these components.The critical wall sticking temperature decreased as the water cut increased,ranging between 13℃to 18℃.Furthermore,with a rise in dissolved gas pressure,both the wall sticking temperature an

关 键 词：含蜡页岩油 粘壁规律 粘壁温度 冷输集输 关键参数 

分 类 号：TE832[石油与天然气工程—油气储运工程]