The Logging System Design Of Downhole Video Imaging

In the process of oil and gas field development, it is of great significance to enhance workover and salvage success rate of oil and gas, with efficiently, accurately and Real-time graphical displaying various problems downhole existed. It also plays a crucial role to improve the production efficiency and quality promotion.Recently, video signals of logging system are transmitted by conventional cable, it has the problem of displaying hysteresis quality. Therefore, a kind of downhole video imaging logging system is designed in this paper. The system is mainly composed of inoue module, the transmitting module and downhole module. In downhole module, image data is collected and packaged by CMOS image sensor, with a good lighting environment. It is provided by front-end coaxial illumination method. Then, digital signal is encoded by 1B2 B coding technology to increase "0" and "1" transformation density and meet the subsequent transmission medium requirements for transmission signal pattern. Transmission module is mainly to transmit video data and provide reliable security for downhole video image real-time display by composite fiber optic cable, with long distance, high speed and stable transmission. Inoue module is mainly to raise the image quality of imaging, contrast and display the video image in real time by adaptive image enhancement algorithm.Experiments show that the system has real-time, intuitive and accurate display function for downhole video image.