基于串口Modbus协议的远程张力无线传输设计与实现

摘  要：石油勘探开发测井过程中，要实时监控电缆承受的张力，测井施工中通常在井口天滑轮上挂接张力计，利用通讯电缆连接张力计和测井工程车上的采集系统对电缆张力进行测量和监控。通讯电缆在施工过程中，不论井口还是地面会经常受到钻具等钻探工具设施的碰撞挤压而损坏，为了避免施工中发生此类问题而耽误工时，施工人员提出无线传输张力的方案。张力的采集和无线传输采用模块化设计，利用Modbus传输协议根据实际情况设置采集速度。工程车上配置控制用的工控机，把张力信号恢复成兼容原来绞车面板的模拟量，工控机内安装的控制软件能根据实际灵活配置串口及电池电压监控。

关键词：井口张力;无线传输;Modbus RTU串口协议;绞车面板

中图分类号：TN915.6      文献标识码：A 文章编号：2096-4706（2019）20-0064-03

Abstract：During the oil exploration and development logging process，the tension of the cable should be monitored in real time. In the logging construction，the tension meter is usually attached to the wellhead pulley，and the communication cable is used to connect the tension meter and the collection system on the logging truck. Tension is measured and monitored. During the construction process，the communication cable is often damaged by the collision of drilling tools such as drilling tools at the wellhead or the ground. In order to avoid such problems during construction，the construction workers propose a wireless transmission tension scheme. The tension collection and wireless transmission adopt modular design，and the acquisition speed is set according to the actual situation by using the Modbus transmission protocol. The industrial computer equipped with control on the engineering vehicle restores the tension signal to the analog quantity compatible with the original winch panel. The control software installed in the industrial computer can flexibly configure the serial port and battery voltage monitoring according to the actual situation.

Keywords：wellhead tension;wireless transmission;Modbus RTU serial port protocol;winch panel

0  引  言

測井工程中的井口张力计是用来测量测井电缆承受的拉力的重要工具，电缆张力的大小对于判断井下仪器和电缆是否遇阻和遇卡有极其重要的作用，是处理工程事故必不可少的参考指标。

本文提供的方法是将连接井口张力计和测井工程车的电缆用无线通信方式代替。利用串口Modbus RTU协议，通过安装在测井工程车的工控机进行远程张力信号的实时采集，然后在原有绞车面板上恢复出来便于监控。工控机运行的软件基于Win32平台，能对串口进行配置和读写操作，根据需要调整采集速率。

无线传输的最大好处是免去了电缆的布线，方便了施工，降低了工作量，提高了工作时效。……