Research On Portable Mud Densimeter Based On Ultrasonic Sensor

The energy shortage is one of the most serious problems in the world. At present, almost all of the countries set petroleum at the core position of the energy strategy. Petroleum is the blood of industry, and mud has an extremely important status in the petroleum exploration. In these 50 years, the development of the performance and most related technologies are continuously rapid, but the development of the mud density detection technology is very slow. Density is an important parameter of the mud, however, the existing equipments for detecting mud density are either ponderous or troublesome, and all of these bring inconvenience to the detection scene.The purpose of this paper is to improve the testing system. The system uses the ultrasonic testing. Ultrasonic testing is one of the most mature testing technologies. Ultrasonic testing is not only convenient, but also reduces the size and weight of testing equipments effectively, and it make testing mud density simple and convenient.Testing the mud density by ultrasonic is introduced in this thesis. First, the behaviors of the ultrasonic transducer are studied and analyzed. Next, the theory of ultrasonic detection is introduced. It gives emphasis on the relationship of the mud density and ultrasonic signal, as well as the different effects ultrasonic attenuation when ultrasonic signal transmits in the mud with different densities. Then, the mud density test system has been developed on the basis of them. The system includes emission circuit, receiving circuit and digital circuit which can acquire and process the voltage signal. And then, the software design and the control strategy are introduced. This scheme has realized the detection of mud density between 1 and 1.5g/cm3. At last, the experiment data are analyzed. The bugs are summarized, and further work for improving the quality of the system is indicated.