摘要
深水气井测试面临水深和地质环境复杂的双重挑战,测试作业费用昂贵并且井筒中容易生成水合物,如何缩短测试时间、避免测试管柱中的水合物堵塞风险并且最大程度地获取气藏信息是困扰深水气井测试的难题。构建了考虑井筒水合物沉积动态预测的深水气井测试程序优化和产能解释方法:(1)建立了考虑水合物相变的深水气井测试井筒多相流模型,模型中考虑了水合物的生成和沉积动力学机制,实现了井筒内水合物生成、沉积、堵塞动态演化规律的定量预测;(2)考虑井筒内水合物堵塞防治,提出了求产产量顺序的确定方法;(3)在此基础上,建立了基于一开一关和多产量序列的深水气井不稳定试井分析模型,并结合南海深水气井测试实例进行了验证和分析。模拟结果表明:建立的井筒多相流模型和气井不稳定试井分析模型可以准确地描述井筒和储层内的流动过程,井底压力的计算误差为1.351%。采用建立的模型和方法,可以有效避免测试过程中的水合物流动障碍形成,并成功结合深水气井测试资料进行了产能解释。本文研究结果可以为现场深水气井测试中的井筒水合物防治、测试制度优化以及产能解释提供理论支持。
Confronted with the dual challenges of water depth and complex geological environment,deepwater gas well test is expensive and hydrate is easy to be generated in the wellbore.How to shorten well test time,avoid hydrate blockage risk in the test string and obtain gas reservoir information to the greatest extent is a difficult problem perplexing deepwater gas well test.In this paper,the test system optimization and productivity interpretation method of deepwater gas wells considering the performance prediction of wellbore hydrate deposition are constructed.Firstly,a wellbore multiphase flow model of deepwater gas well test considering hydrate phase transition is established.The kinetic mechanism of hydrate formation and deposition are considered in the model,and the quantitative prediction of the dynamic evolution law of hydrate formation,deposition and blockage in the wellbore is realized.Secondly,a method for determining the order of gas production rates is proposed on the basis of considering the prevention and control of hydrate blockage in the wellbore.Thirdly,a non-stabilized well test analysis model of deepwater gas wells based on one open-one close and multi production sequence is established,which is verified and analyzed by combining with the test example of deepwater gas wells in the South China Sea.The simulation results show that the established wellbore multiphase flow model and non-stabilized well test analysis model can accurately describe the flow process in wellbore and reservoir,and the calculation error of bottom hole pressure is 1.351%.The established model and method can effectively avoid the formation of hydrate flow obstacles during well test process,and successfully interpret well productivity in combination with deepwater gas well test data.The research results of this paper can provide theoretical support for wellbore hydrate prevention,test system optimization and productivity interpretation in field deepwater gas well tests.
作者
李中
刘书杰
孟文波
黄熠
余意
LI Zhong;LIU Shujie;MENG Wenbo;HUANG Yi;YU Yi(CNOOC Research Institute Ltd.,Beijing 100028,China;CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 527057,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第6期147-157,共11页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司科研项目“南海西部油田上产2000万方钻完井关键技术研究(编号:CNOOC-KJ135ZDXM38ZJ05ZJ)”部分研究成果。
关键词
深水
气井测试
水合物
沉积堵塞
优化
产能解释
deepwater
gas well test
hydrate
deposition and blockage
optimization
productivity interpretation
