Downhole Parameters Test Instrument

Electrical logging is widely used in logging technologies.The method to deduce the physical parameters of soil layer according to the respondence of the logging tools is called electrical logging. Induced polarization potential (IPR) logging technique is an important technology of electrical logging. And for the traditional instruments, there are several disadvantages, such as big volume, not easy for use, low precision which couldn't meet the need of well logging, and difficulties in logging interpretation. So it is important to design a new kind of logging instrument for oil exploration. To improve the traditional instruments and design a new one is this thesis emphasized.The detective instrument for sensing oil-well data developed in this thesis is an embedded system with the core of AT89C55. What's more, the embedded system includes several interfaces for human-robot interaction, such as keyboard input,LED digital display tubes, serial communication, and the interface for plotter. The software of the system is based on RTX-51,and this has been improved the real-time performance and relibility of the system.The research work in this thesis is described as follows:1) According to the theory of the electrical logging, a design for the detective instrument for sensing oil-well data is presented.2) According to the well logging requirement, the embedded system with AT89C55 , interface circuit, and the the circuit of signal adjusting which can well work under strong electromagnetic disturbance are designed.3) A software system with high reliability and real-time performance and module architecture is designed based on RTX-51 and C51.In a word, the field testing result nicely proves the stability design in both software and hardware.