深水油气开采过程中多环空温度变化特征与敏感性分析  

TO ANALYZE TEMPERATURE CHANGE RULES AND SENSITIVITY IN MULTI-ANNULI DURING DEEPWATER OIL/GAS DEVELOPMENT

作　　者：刘劲歌 樊洪海[2] 胡杭健 王果[1] 周号博[1] 

机构地区：[1]中国石化石油工程技术研究院 [2]中国石油大学(北京) [3]中国特种设备检测研究院

出　　处：《钻采工艺》2017年第6期49-52,共4页Drilling & Production Technology

基　　金：国家科技重大专项"钻井工程设计邻井信息分析系统及重点井钻井作业风险远程实时预警软件开发与应用"(编号:2016ZX05020006-005)

摘　　要：深水高温油井开采初期,产出的高温流体与环空液体存在较大的温度差,使得环空液体温度升高。环空温度升高,受热膨胀是导致环空圈闭压力骤增的主要原因,严重影响套管安全、井筒完整性以及油井的安全可持续开采。为了获得深水油井开采初期多环空温度变化特征,基于半稳态井筒传热模型,计算并分析了深水不同环空温度的变化特征。同时,对影响环空温度变化的重要因素,如油井产量、生产时间、地温梯度等对环空温度升高的影响进行分析。分析结果表明,生产时间和油井产量对环空温度的升高影响较大。环空温度升高主要集中在生产初期,尤其是在生产的前两天。环空液体温度随着产量的增加而升高明显,这是由于油管内对流换热系数和单位时间内携带的热量随着产量的增加而升高。另外,地温梯度和采出流体的物理性质同样会对环空温度带来直接的影响。掌握各环空温度变化特征和油井产量及生产时间等影响因素与环空温度升高之间的关系,有助于制定合理的井身结构、合理的开采制度,以确保套管安全、井筒完整性和油井的可持续安全开采。At the early development stage of the high-temperature deepwater oil wells,the thermal expansion induced by the temperature increase in the annulus fluid is the primary cause of the APB( annular pressure buildup),severely threatening the casing safety,the well integrity and the safe sustainable development of oil wells. With the aim to obtain the temperature increase behavior in the multiple annuli in oil & natural gas subsea wells,the annular temperature simulation is done based on the semi-steady state heat-transmission model. In addition,the analysis of single factors demonstrates that the production rate,the production time,the geothermal gradient and the physical properties of formation fluid all have great influence on the temperature increase in multi-annuli. The temperature increase is mainly developed at the starting period of production,approximately within 50 hours. Knowing the influence of these key factors on the temperature increase will help to work out a proper casing program and a proper production system,ensuring the casing safety,wellbore integrity and sustained production.

关 键 词：井筒热传递 环空温度 环空圈闭压力升高 深水油气开采 

分 类 号：TE53[石油与天然气工程—油气田开发工程]