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接近，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 closer, taking into account the emission signal underground system, not the use of large signal voltage amplitude.

It can be seen from the wells, pipelines and structural characteristics of the casing is more akin to the distance between downhole system, taking into account the transmission signal, when it was not appropriate to use a great value in the signal voltage.

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

Structural characteristics from the well known, close to 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 relatively close, while considering the systematic transmission signal in the pit, it is unsuitable to adopt the signal that the voltage amplitude is bigger.