井下视频成像测井技术  

Down-hole video imaging technology

作　　者：张家田[1] 严正国[1] 胡长岭[1] 马虎山[1] 

机构地区：[1]西安石油大学电子工程学院,西安710065

出　　处：《仪器仪表学报》2007年第4期714-717,共4页Chinese Journal of Scientific Instrument

摘　　要：井下视频成像测井利用井下摄像头获取井眼实时图像信息,可用于套管检测、落物打捞、井下作业质量检查等。文中采用基于小波变换的图像压缩技术、高速数字调制传输、基于CPLD的数字解调算法、特殊的井下仪器结构设计,解决了井下电视图像压缩,电缆高速数据传输,井下照明和保温等关键技术问题,设计出了井下电视成像测井仪样机,经过3000m电缆传输试验和125℃高温试验,仪器工作可靠、图像清晰稳定。Downhole video logging technique captures borehole images by downhole camera and can be applied to well casing inspection, downhole fishing, downhole completion quality inspection, etc. A prototype of the down-hole video logging instrument was designed, which adopts wavelet based image-compression, high speed digital modulation transmission, CPLD based demodulation, and special downhole instrument structure design to solve some key technical problems, such as downhole video image compression, high speed cable data transmission, down-hole illumination, and high temperature and etc. 3 000 m cable data transmission and 125℃ environment test were carried out. Experiment results prove that the instrument works reliably and stably, and the image is clear and stable.

关 键 词：井下视频 图像压缩 电缆传输 

分 类 号：TE151[石油与天然气工程—油气勘探]