The Research Of Downhole-signal Digital Transmission And Acquisition Technology

First, this dissertation simply introduced the survey of production log in oil field. The production log dated from the end of 30s. In the beginning, we only used well record thermometer to probe the fluid flowing anomalously. In the 80s, the technology production log not only improved in quantity, but also improved in quality. With the improvement and application of computer technology production log went into the new era of digital record and digital control log. Then the design principle of well temperature and pressure gauge and experiment were introduced in this dissertation. The experiment proved that this well temperature and pressure gauge expressed well. Next the transmission and acquisition technology of signal was researched in theory. Under its guidance the transmission tie-in of signal was designed and the software of mulitiple-parameter acquisition system was wrote. In the design of signal transmission tie-in, we selected PIC16C73 who had the excellence of low ullage, high capability, CMOS, complete static state and 8 bits EPROM as the core CMOS chip of signal transmission tie-in. The bus unit of PIC16C73 adopted the independent Harvard unit whose data bus and instruction bus separated from each other. It had very high processing speed and execute speed up to DC～200ns. Because of its reduced instructions all of its instructions were single byte. It only had 35 instructions. All of its instructions were single period expect that jump instruction was two-period. Therefore it was easy to study and its efficiency of program space was much higher than average singlechip. Meanwhile it had very high software reliability. The software of mulitiple-parameter acquisition system was wrote in VC6.0 background. Visusal C++6.0 was a ripe, strong and very elastic tool,which help user come true his the most insane dream of software. Of course, the software that this paper refered to was only a small part. This paper simply introduced the approximate procedure that designed the software of mulitiple-parameter acquisition system, and expatiated every module function of this software.