关键词: 存储式, 水泥胶结测井, 高精度深度测量, 自动校深, 缓冲短节

Abstract: In the process of cement bond evaluation logging for highly-deviated wells, horizontal wells and extended reach wells that kick off at shallow depth under complex conditions, conventional drilling tools are used to running the wet-connectors in hole for connection. The method results in problems including low logging timeliness, poor safety and high costs. Advanced memory, high precision depth measurement and time double-control starting technologies are innovated and applied to the memory cement bond evaluation logging system. In the process of logging, the downhole instrument are connected to drill pipe and lowered into the bottom of hole directly. In this way, the new-type buffer nipple can effectively prevent the instrument from being damaged by the shock when the instrument is lowered into the bottom of hole. The system is started by starting the preset instrument and makes storage while measuring. After the logging, the instrument is lifted to the surface for data reading and information preprocessing. The system has been applied successfully to nearly hundreds of domestic wells. The application shows that it works stably and the logging curves and images can really reflect the cementing quality on the first and second interfaces. Therefore, the system has such advantages as high timeliness, strong security and low costs so that it fills the blank of cement bond logging equipment for complex well conditions in China.