海上电泵结蜡井热循环洗井工艺参数优化设计

Optimization of Parameters for Well Flushing via Hot Fluid Circulation in Offshore Electric Submersible Pump Wells Clogged by Wax Deposits

杨万有 郑春峰 李昂 王磊

YANG Wanyou ZHENG Chunfeng LI Ang WANG Lei

中海油能源发展股份有限公司工程技术分公司, 天津 滨海新区 300452

Engineering Technology Branch, CNOOC Energy Technology & Services Co. Ltd., Binhai New Area, Tianjin 300452, China

为探索海上油田电泵举升结蜡井热循环洗井工艺井筒温度场分布规律，综合考虑潜油电机增温、电缆散热、热流体注入量、注入深度、注入温度、结蜡管段传热和海水空气导热的影响，基于热能守恒原理，建立了电泵井结蜡热循环洗井工艺井筒温度场计算模型，分析了热流体注入温度和注入量对混合产出流体的井筒温度分布的影响。研究结果表明，随着注入量的增加混合产出液沿程井筒温度增加，随着注入温度的增加混合产出液沿程井筒温度增加。该方法可有效指导现场措施工艺的实施，达到延长结蜡井的清蜡周期、延缓产液/产油量下降速度的目的。

To investigate the distribution patterns of wellbore temperature fields during well flushing via hot fluid circulation in electric submersible pump (ESP) wells of the Bohai Oilfield, we constructed a computational model for the temperature fields of wellbores during hot fluid circulation in ESP wells based on the principle of conservation of heat. This model accounts for effects associated with the heating of the ESP, electric cable cooling, volume of hot fluid injection, injection depth, injection temperature, heat transfer in the wax-clogged pipeline segments, and thermal conductivities of seawater and air. Using this model, we analyzed the effects of injection temperature and injection volume on the wellbore temperature distribution of mixed production fluids. The results of this study show that the temperature distributions of mixed production fluids along the wellbore are positively correlated with increases in injection temperature and injection volume. Our model can be used as a guide to dewaxing processes in the field, thus prolonging the dewaxing cycles in wax-prone wells and reducing the rates at which fluid and oil production decrease over time.

10.11885/j.issn.1674-5086.2018.04.18.02