分布式光纤温度监测水平井油水两相流产出剖面微温度响应机理

分布式光纤温度传感技术（DTS）克服传统产液剖面测试工艺缺陷，实现了水平井井下复杂环境温度实时精准监测。科学解释DTS温度数据背后隐藏的物理现象及响应机制是准确获知水平井实时产出状况和储层信息的关键，也是实现井下产出智能实时遥控的重要前提。为此，本研究以水平井油水两相流产出微温度响应机制为研究对象，结合室内实验、理论分析和数值模拟方法，通过水平井井筒油水两相流微温度响应监测实验，量化表征流动微热量效应系数与敏感性参数间关系；考虑复杂渗流流态和全面微热量效应影响，建立水平井油水两相渗流—管流/温度—压力场双耦合时空产出响应模型；利用现代数学方法求解模型，结合实验结果修正完善模型；剖析并揭示微量热效应、流体类型、流量等对水平井油水两相流产出水动力学和热力学行为响应特征及机理。研究成果将形成水平井多相流产液剖面解释分析核心理论体系，突破水平井高效开发技术瓶颈。

Distributed optical fiber temperature sensing technology (DTS) overcomes the defects of traditional liquid production profile testing technologies, realizes the temperature monitoring in horizontal wells in real time and accurate. To obtain the real time output of horizontal wells and the reservoir information accurately, it is the key to interpret the physical phenomena and response mechanisms of the DTS temperature data，and it’s also an important prerequisite to realize intelligent control of the downhole production in real time. Thus, taking the micro-temperature response mechanism of the oil-water two phase in horizontal wells as the research object, experiments, theoretical analysis and numerical simulation methods are applied to do the study. First monitoring experiment of micro-temperature response of the oil-water two phase flow in the horizontal wellbore is conducted, and the relationship curves of the micro calorimetric effect coefficients versus sensitivity parameters are characterized quantitatively. Considering the influence of the complex flow state in porous media and the effect of the micro-heat during the flow, the double coupled output response model of the horizontal well flow in porous media flow-tube flow/temperature-pressure filed is established. Subsequently, the model will be solved by the mathematic method, and improved to be a perfect model by combining with the experimental results. Finally, the response characteristics and mechanism of the hydrodynamic and thermodynamic behavioral which are influenced by micro-heat effect, fluid type and flow rate et al., are analyzed. The research results will form the key theory system for interpretation and analysis of the multi-phase flow liquid production in horizontal wells, and break through the bottleneck of high efficiency development technology of horizontal wells.