GOALI/Collaborative Research: Self-powered Dual-mode Piezoelectric Resonant Pressure/Temperature Sensors for Oil and Gas Field Explorations

该学术联络与工业（GOALI）合作研究项目的目标是研究一种新型的自供电双模压电谐振压力/温度传感器，该传感器可以在恶劣的井下环境中工作，而不需要外部电力，作为解决高温、高压、大冲击环境下的井下传感和供电的关键挑战的一个步骤。对新型高温压电材料的材料特性进行了表征，并进行了理论分析，预测了双模传感的具体切割角度。设计一种新型扭振能量采集器和热电发生器，利用井下钻井产生的电能，具有抑制钻柱自激扭振的双重功能。完整的自供电传感系统将通过实验室和现场测试进行验证。如果成功，研究结果将创造有关高温高压传感和能量收集的新知识。材料性能数据和理论建模不仅可以实现在恶劣环境下工作的压电谐振传感器的可预见性设计，也将为今后的压电谐振器设计奠定坚实的基础。所提出的多源热电和电磁能量收集机制不仅可以从井下固有的热量和钻柱振动中产生有用的能量，而且还为恶劣环境下的能量收集创造了新的知识，具有更广泛的应用前景。这种自供电传感系统将引领人们钻探更深、产量更高的油气井，以满足国家迫切的能源需求。与研究相结合的是两所参与大学精心策划的教育和推广计划，特别是针对少数民族、女性、本科生和K12学生。

The objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) Collaborative Research project is to investigate a novel self-powered dual-mode piezoelectric resonant pressure/temperature sensor that can operate in the harsh downhole environments without requiring external electricity as a step to resolve the critical challenges for downhole sensing and power supply posed by high temperature, high pressure, large shock environment of oil/gas field explorations. The material properties of the new high temperature piezoelectric material will be characterized, and theoretical analysis will be performed to predict the specific cut angle for dual-mode sensing. A novel torsional vibration energy harvester and thermoelectric generator will be designed to harness electricity from downhole drilling with dual function of suppressing the self-excited torsional vibration of the drill string. The complete self-powered sensing system will be validated through laboratory and in-field test. If successful, the results will create new knowledge on high temperature and high pressure sensing and energy harvesting. The data of material properties and theoretical modeling will not only enable predictable design of the piezoelectric resonant sensor operating in harsh environments but also will lay a solid foundation for future piezoelectric resonator design. The proposed multi-source thermoelectric and electromagnetic energy harvesting mechanism not only generates useful energy from the intrinsic downhole heat and drillstring vibrations, but also creates new knowledge of energy harvesting in harsh environments with broader applications. The self-powered sensing system will lead the way to drilling deeper and more productive oil & gas wells to meet the urgent national energy need. Integrated with the research is a carefully orchestrated educational and outreach plan at the both participating universities, particularly for minorities, women, undergraduate, and K12 students.