求翻译：从油井的结构特征可知，油管和套管之间的距离比较近，在考虑井下系统的发射信号时，不宜采用电压幅值较大的信号。是什么意思？

Structural features from the well known, the distance between the tubing and casing relatively close, considering the underground system, the transmitted signal, the appropriate use of large signal voltage amplitude.

It can be seen from the wells, pipelines and structural characteristics of the casing, the distance between the relatively recent downhole system takes into account the transmission signal voltage increase, it was not appropriate to use a larger signal value.

May know from the oil well structure characteristic, between the drill tubing and the drive pipe distance quite is near, when consideration mine shaft system transmitting message, not suitably uses the voltage peak-to-peak value big signal.

Structural characteristics from the well known, the distance between the tubing and casing, taking into account the underground systems of the signal, not using large voltage amplitude of the signal.

Can know from structure characteristic of oil well oil pipe with distance between being telescopic closer, while considering the systematic transmission signal in the pit, it is unsuitable to adopt the signal that the voltage amplitude is bigger.