80MPa沙漠油田用撬装固压装置自动测量系统

沙漠油田用撬装固压装置要求对水泥浆的密度、流量和压力能够准确的测量，以确保固井及酸化压裂的质量．采用高质量的传感器、变送器作为一次仪表，在恶劣的环境下选用高性能的ＳＴＤ总线工业控制机作为二次仪表，二者组成一个完整的自动测量系统．该系统的传感器把水泥浆的密度、流量及压力信号转换成电压信号，再经过变送器变成４～２０ｍＡ的电流信号以利远传．工控机收到的电流信号再转成１～５Ｖ的电压信号，经滤波、采样保持后，再经Ａ／Ｄ转换成数字信号，该数学信号经处理后就可在主机上显示相应的水泥浆密度，瞬时流量，累计流量和压力值．为了实现远传，现场和主机间增设了无线通讯系统，利用车载台发射主机的数字信号，利用手持机接收这些数字信号，并经单片机控制自制的液晶显示器，显示这些数字信号．整个系统抗干扰能力强，工作可靠、精度高，已通过部级签定．

Development of the Automatically Measuring System for 80MPa Skid mounted Cementing and Fracturing Unit

A skid mounted cementing and fracturing unit used in desert oilfields is required accurately measuring the density,flow and pressure of slurry to ensure the quality of cementing and fracturing.A high quality sensor as primary instrument,and a good performance STD bus industrial computer as secondary instrument forms a complete automatic measuring system.The sensor transforms the density,flow and pressure signals of slurry into voltage signals,which are further changed into 4～20mA current signals through a transducer.The industrial computer receives the current signals and convert them into 1～5V DC voltage signals.The voltage signals are filtered,sampled,and then transformed into digital signals by A/D converter.After being processed,they are displayed on the computer as the values of density,instantaneous rate of flow,total flow and pressure.In order to remotely transmit,a wireless communication system was added between the computer and the site.These data are transmitted to the operators in the site.The system has high anti interference,reliablity and accuracy.