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The parameters of the mud have an extremely important status in the petroleum exploration. In these 50 years, the development of petroleum exploration technology is continuously rapid, but the development of the mud density detection technology is very slow. Density and electrical conductivity are the important parameters of mud, however, the existing equipments for detecting mud density and electrical conductivity are either ponderous or troublesome, and all of these bring the inconvenience to the detection scene.Against mud density testing, more comprehensive studyabout ultrasonic attenuation law has been done in this subject. And the situation of the ultrasonic signals decaying in the mud in the spread was analysed particularly, the relationship was established between a mud density and ultrasound signals back; Against the mud conductivity testing, the AC power was used to eliminate the polarization in the test of electrical conductivity, in this subject, electrodes inserted way was used to test electrical conductivity, it changes the traditional testing methods and facilitates the test.In this subject, on the basis of relevant principles, the corresponding design for hardware, SCM Atmega16L as the core, was designed. In the mud density testing system, Ultrasonic excited circuit, receiving voltage circuit and the echo of the signal processing circuit was designed in the mud Conductivity testing system, the sine circuit design, measuring circuit and peak extraction circuit was designed.In terms of software, A / D conversion process, interrupt service process and display process was designed in this thesis.Through experiments, the subjects described the curve between mud density and echo amplitude, and gives a corresponding estimate of accuracy.
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