Microchip Tracer Power Supply Technology and Downhole Testing
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摘要: 微芯片示踪器的工作性能受电源影响较大，有时在井下不能采集到完整的数据，为此，设计了以可充电锂电池为电源，采用无线充电技术给其充电的供电方案。通过充放电试验考察了无线充电过程中充电电压与送电电压、线圈对心距和充电时间的关系，以及高温环境对电池放电特性的影响。结果表明：送电电压和线圈对心距之间相互影响，送电电压较小和充电距离过大，充电电压均达不到充电要求，反之充电电压过大会导致电池被充爆；充电时间越长充电效果越好，但会增长现场作业时间，而充电时间过短又会导致电池充电不充分；锂电池高温下的放电速度比常温下快。现场入井试验结果表明，采用设计供电方案的微芯片示踪器能够采集到整个井筒的温度数据。这表明微芯片示踪器采用设计的供电方案可以解决示踪器工作性能受电源影响的问题。Abstract: A tracer,with its working performance affected greatly by the power supply,sometimes cannot collect a complete set of downhole data constrained by the source.In order to solve this problem,a power supply plan was designed using rechargeable lithium batteries as the source and the wireless charging technology to charge the battery.Through charge-discharge experiments,the relationship between charging voltage and transmission voltage,central distance of coils,and charging time,and the effects of high temperature on the discharge properties were researched.Research results showed that transmission voltage interacted with the central distance of coils.In theory,when the transmission voltage was much lower and the charging distance much longer,the charging voltage should have failed to reach the charging demands.However,on the contrary,the excessive charging voltage could result in an exploding battery due to overcharge.And,while a long charging time could assure good charging effects,the field operation duration should be further lengthened,because an overly brief charging time could also cause the inadequacy of charging;under high temperature,and thus the lithium battery could experience accelerated discharge especially compared with batteries under normal temperature.Furthermore,the field downhole tests indicated that the tracer designed as the new power supply plan could collect all temperature data for the whole wellbore.Therefore,adopting the power supply plan in this type of tracers could solve the power supply problems.
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Keywords:
- microchip tracer /
- lithium battery /
- wireless charging /
- data acquisition
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