Key Technologies Of Wireless Acoustic Transmission. Deep Well

With the development of the petroleum industry, the testing of deep wells, drilling and exploitation of an increasingly important role. As an important aspect of oil and gas, underground access to information and data become the focus of the industry, opposing to the enormous cost of cable transmission and operation cumbersome disadvantage, cost-effective wireless transmission with simple operation, naturally become a hot research. Used in wireless transmission because of the Sham Tseng special, high temperature and high pressure deep well under the harsh environment of how to ensure that the wireless transmission as a study and discussion in this article the focus lies.Deep well wireless transmission means, including mud, electromagnetic waves and sound waves, each has advantages and disadvantages of these methods to adapt to the scene also vary; the most adaptive acoustic transmission, but the most difficult current study. Because of sound transmission in the deep well, many are spread through the tubing string, in this paper to discuss the nature of common wireless channel on the basis of a detailed analysis of the acoustic string of pipe at the transmission characteristics, in particular, such characteristics are in the band on the distribution of and further analysis of the acoustic channel in the deep well transmission characteristics under.Analysis of channel characteristics, the paper, single-carrier frequency domain equalization technology as the basic algorithm for wireless transmission structure, by analyzing the balance of the principle of communication and discussion on the basis of frequency domain equalization of the channel model and the unique use of the word, give a frequency domain equalization the basic structure. Discussed and compared the zero-forcing and MMSE equalization methods, and MATLAB? simulation comparing the performance of two methods.Based on sound transmission characteristics and algorithm analysis, this paper presents the design of the basic structure of the system to discuss the media control protocol and system implementation, and the introduction of electrical standards dsPIC devices and digital processing functions. Finally, this paper presents the structural design of the system and will be used in other wireless technologies.In this paper, wireless transmission of sound waves deep well applications are: the realization of industrial applications including oil exploration, including underground, drilling control, when the underground mining of the information data signal transmission and processing; and further study can be used as underground and ground of the basic two-way transmission .At the same time, the use of this article dsPIC digital signal controller platform can be used as other pieces of mine in real-time processor selection of reference, this article describes the development of methods and processes can be used as transmission system Sham means to achieve other reference transmission.