深水油气开采过程中多环空温度变化特征与敏感性分析

发布时间：2019-04-13 11:33

【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。
[Abstract]:In the early stage of deep-water high-temperature oil well exploitation, the temperature difference between the produced high-temperature fluid and annulus liquid is large, which causes the temperature of annular liquid to rise. The increase of annular temperature and thermal expansion are the main reasons leading to the sudden increase of trap pressure, which seriously affect casing safety, wellbore integrity and safety and sustainable exploitation of oil wells. In order to obtain the variation characteristics of multi-annulus temperature in the early stage of deepwater oil well exploitation, based on the semi-steady-state wellbore heat transfer model, the variation characteristics of different annulus temperatures in deep water are calculated and analyzed. At the same time, the influence of important factors, such as oil well production, production time and ground temperature gradient, on the increase of annulus temperature is analyzed. The results show that the increase of annulus temperature is greatly influenced by production time and oil well production. The increase in annulus temperature is mainly concentrated in the initial stage of production, especially in the first two days of production. The temperature of annulus liquid increases obviously with the increase of yield, which is due to the increase of convective heat transfer coefficient in tubing and the heat carried in unit time. In addition, the ground temperature gradient and the physical properties of the produced fluid also have a direct effect on the annulus temperature. Mastering the relationship between the variation characteristics of annulus temperature and the influence factors such as oil well production and production time with the increase of annulus temperature is helpful to establish a reasonable wellbore structure and reasonable production system to ensure casing safety. Wellbore integrity and sustainable and safe production of oil wells.
【作者单位】：中国石化石油工程技术研究院;中国石油大学(北京);中国特种设备检测研究院;
【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)
【分类号】：TE53

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