鄂尔多斯盆地南缘X井区连续油管速度管柱工艺及其应用  

Technique and its application of drainage gas recovery by coiled tubing velocity string in Well Block X in southern margin of Ordos Basin

作　　者：翟中波 房伟 俞天军 漆世伟 唐明明[2] 李依吉川 ZHAI Zhongbo;FANG Wei;YU Tianjun;QI Shiwei;TANG Mingming;LI Yijichuan(Schlumberger Copower Oilfield Services Co Ltd,Xi’an 710021,China;Shaanxi Yanchang Petroleum(Group)Exploration Company,Yan’an 716002,China)

机构地区：[1]斯伦贝谢长和油田工程有限公司,陕西西安710021 [2]陕西延长石油(集团)有限责任公司油气勘探公司,陕西延安716002

出　　处：《大庆石油地质与开发》2022年第4期82-89,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：陕西延长石油(集团)油气勘探公司2021年自主攻关项目“延安气田速度管柱排采工艺应用效果评价及适用性研究”(yqkt-2021zz-41)。

摘　　要：为了分析连续油管速度管柱对积液气井排水采气的作用效果和机理,以X井区的积液气井为研究对象,以气井的生产时间为轴线,结合油压、套压、气水量等生产数据,使用多相流稳态模拟器,对其安装不同内径和下入深度的速度管柱作敏感性分析。模拟和应用结果表明:综合考虑压力损失、携液能力、关井后重新开井的启动能力的影响,X井区80%积液气井选用外径38.1 mm (内径31.75 mm)的速度管柱,下至最上一级生产层位深度时,具有最优的排水采气效果;安装速度管柱前后井筒中的气体流速、持液率、流态以及积液状况明显不同,速度管柱下部1/3内的气流速度大于临界携液流速(120 m/min)是X井区速度管柱能够携液的主要原因;Y6-3井安装速度管柱前最大气体流速为85 m/min,不能正常携液,而安装速度管柱后最小气体流速为275 m/min,大于临界携液流速,因此能正常携液。按照此理论和方法安装合适尺寸和深度的速度管柱后,X井区气井的积液状况得到明显改善。In order to fully analyze the effect and mechanism of drainage gas recovery by coiled tubing velocity string in liquid loading gas well,taking liquid loading gas wells in Well Block X as research objects and gas wells’ production time as shaft line,combined with production data including producers’ tubing and casing pressures,gas and water rate etc,with the help of multi-phase flow steady-state simulator,the sensitivity analyses are conducted for the velocity strings with different inner diameters and setting depths.The simulated and applied results show that the impacts of pressure loss,liquid carrying capacity and re-opened-well start-up capacity after closing the well are comprehensively taken into account,38.1mm outer diameter(31.75 mm inner diameter)velocity strings are installed and run into 80% liquid loading gas wells in Well Block X,with the best effect of drainage gas recovery when running to the uppermost producing layer depth.Gas velocity,liquid holdup,flow regime and liquid loading status in wellbore are obviously different before and after installing velocity string,and the main cause of liquid unloading by velocity string in Well Block X is that gas velocity in the lower 1/3 part of the velocity string is higher than the critical liquid unloading velocity(120 m/min).Before installing velocity string for Well Y6-3,the maximum gas velocity is 85 m/min,which cannot realize normal liquid unloading,while after installation,the 275 m/min minimum gas velocity is higher than critical value and can unload liquid normally.According to this theory and method,the installed velocity strings obviously improve the liquid loading situation of the gas wells in Well Block X.

关 键 词：排水采气 速度管柱 尺寸(内径) 下入深度 启动能力 携液机制 鄂尔多斯盆地 

分 类 号：TE377[石油与天然气工程—油气田开发工程]