摘要
深水气井测试初开井阶段为典型的非稳态变化过程,采用稳态模型计算的温度和压力误差较大,导致水合物预防缺乏准确依据。综合考虑开井过程、海洋与地层环境差异、井身结构、测试管柱尺寸、产量以及气体上升过程中的膨胀做功等因素,建立了深水气井测试初期管柱内温度和压力模型;在此基础上,结合水合物相平衡条件,得到了深水气井从开井到稳定生产阶段的水合物生成区域预测方法。不同开井产量和开井时间对水合物生成区域影响规律分析结果表明,管柱内温度随着开井时间的增加而相应升高并逐渐趋于稳定,而水合物的生成区域会随着开井时间增加而逐渐减小,达到稳定后保持不变;初开井产量对水合物生成区域影响较大,适当提高开井产量有助于降低水合物生成风险。本文建立的预测方法可以为深水气井作业水合物防治方案设计提供依据。
The initial well opening stage of the deepwater gas well testing is a typical unsteady change process.The temperature and pressure calculated by the steady-state model have large errors,resulting in a lack of accurate basis for hydrate prevention.In view of this special process,the model of temperature and pressure in the pipe string at the initial start-up stage of deepwater gas well testing was established through comprehensive consideration of factors such as well opening process,difference between seawater and formation environment,wellbore structure,test pipe string size,production rate and expansion work in the process of gas rising.On this basis,combined with hydrate phase equilibrium conditions,the prediction method for the hydrate formation area from the well opening stage to the stable production stage was obtained.The analysis of the influence of different well opening production rates and well opening time on hydrate formation area shows that the temperature in the string increases with the increase of well opening time and tends to be stable gradually,while the hydrate formation area decreases with the increase of well opening time and remains unchanged after reaching stability.The production rate of the initial opening well has a great influence on the hydrate formation area,thus appropriate increase of the well opening production rate helps to reduce the risk of hydrate formation.The prediction method established in this paper can provide design basis for hydrate prevention and control scheme in deepwater gas well operation.
作者
刘书杰
孟文波
黄熠
董钊
姚旺
高永海
孙宝江
周有为
LIU Shujie;MENG Wenbo;HUANG Yi;DONG Zhao;YAO Wang;GAO Yonghai;SUN Baojiang;ZHOU Youwei(CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524057,China;School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第2期136-141,共6页
China Offshore Oil and Gas
基金
中国海洋石油集团有限公司重大科技专项“南海西部油田上产2000万方钻完井关键技术研究(编号:CNOOC-KJ135ZDXM38ZJ05ZJ)”
“深水测试关键技术研究(编号:CNOOC-KJ135ZDXM05LTDZJ02)”
国家自然科学基金项目“深水细粉砂水合物试采温压传递特性与非稳态渗流研究(编号:51876222)”部分研究成果。
关键词
深水气井
温度
压力
初开井
水合物预测
deepwater gas well
temperature
pressure
initial well opening
hydrate prediction
作者简介
第一作者:刘书杰,男,教授级高级工程师,1989年毕业于中国石油大学(华东)钻井工程专业,2016年获得中国石油大学(北京)博士学位,现在主要从事海洋石油钻完井研究及管理工作。地址:海南省海口市秀英区西海岸荣城铂郡海油大厦(邮编:570312)。E-mail:liushj@cnooc.com.cn。
