一、引言井温是油井和气井在勘探和开发中的重要参数,对于几千米深的油气井测温,要求温度传感器具有耐高温,灵敏度高,线性好,时间常数小,耐高压力,体积小和可靠性高等综合特点。其中提高灵敏度是精确分辨井下油、水和气的重要措施。但是,在具备上述综合特点 I. INTRODUCTION Well temperature is an important parameter for oil and gas wells in exploration and development. For temperature measurement of oil and gas wells of several thousand meters in depth, temperature sensors are required to have high temperature resistance, high sensitivity, good linearity, small time constant, high pressure resistance, Small size and high reliability of the integrated features. Among them, increasing the sensitivity is an important measure to accurately distinguish downhole oil, water and gas. However, with the above comprehensive features