A mechanistic model of heat transfer for gas–liquid flow in vertical wellbore annuli  

作　　者：Bang-Tang Yin Xiang-Fang Li Gang Liu 

机构地区：[1]School of Petroleum Engineering, China University of Petroleum (East China) [2]College of Petroleum Engineering, China University of Petroleum,Beijing

出　　处：《Petroleum Science》2018年第1期135-145,共11页石油科学（英文版）

基　　金：sponsored by the National Natural Science Foundation of China (Grant No. 51504279);Shandong Provincial Natural Science Foundation, China (ZR2014EEQ021);Qingdao Science and Technology (15-9-1-96-jch);the Fundamental Research Funds for the Central Universities (17CX02073, 17CX02011A and R1502039A);973 Project (2015CB251206)

摘　　要：The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern. Several different flow patterns can exist under different flow conditions which have significant effects on liquid holdup, pressure gradient and heat transfer. Gas-liquid two-phase flow in an annulus can be found in a variety of practical situations. In high rate oil and gas production, it may be beneficial to flow fluids vertically through the annulus configuration between well tubing and casing. The flow patterns in annuli are different from pipe flow. There are both casing and tubing liquid films in slug flow and annular flow in the annulus. Multiphase heat transfer depends on the hydrodynamic behavior of the flow. There are very limited research results that can be found in the open literature for multiphase heat transfer in wellbore annuli. A mechanistic model of multiphase heat transfer is developed for different flow patterns of upward gas-liquid flow in vertical annuli. The required local flow parameters are predicted by use of the hydraulic model of steady-state multiphase flow in wellbore annuli recently developed by Yin et al. The modified heat-transfer model for single gas or liquid flow is verified by comparison with Manabe＇s experimental results. For different flow patterns, it is compared with modified unified Zhang et al. model based on representative diameters.The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern. Several different flow patterns can exist under different flow conditions which have significant effects on liquid holdup, pressure gradient and heat transfer. Gas-liquid two-phase flow in an annulus can be found in a variety of practical situations. In high rate oil and gas production, it may be beneficial to flow fluids vertically through the annulus configuration between well tubing and casing. The flow patterns in annuli are different from pipe flow. There are both casing and tubing liquid films in slug flow and annular flow in the annulus. Multiphase heat transfer depends on the hydrodynamic behavior of the flow. There are very limited research results that can be found in the open literature for multiphase heat transfer in wellbore annuli. A mechanistic model of multiphase heat transfer is developed for different flow patterns of upward gas-liquid flow in vertical annuli. The required local flow parameters are predicted by use of the hydraulic model of steady-state multiphase flow in wellbore annuli recently developed by Yin et al. The modified heat-transfer model for single gas or liquid flow is verified by comparison with Manabe＇s experimental results. For different flow patterns, it is compared with modified unified Zhang et al. model based on representative diameters.

关 键 词：Gas-liquid flow Vertical annuli HEATTRANSFER Tubing liquid film Casing liquid film 

分 类 号：TE31[石油与天然气工程—油气田开发工程]