Wellbore monitoring apparatus

摘要

A tool (10) for monitoring corrosion levels within a wellbore is particularly suited for remote monitoring over extended periods. The monitoring tool utilizes a thin wall electrical resistance type corrosion sensor (76) to determine rate of metal loss within the wellbore. The corrosion sensor is preferably made of the same material as the production tubing or drill pipe of the well and is positioned to allow the fluid within the wellbore to flow over the sensor at the same rate as the fluid flows over the tubing. A reference element (78) is incorporated into the corrosion sensor to provide primary temperature compensation. A temperature sensor provides ie temperature data and allows for secondary temperature compensation for the corrosion sensor. A central processing unit reads and stores the data from the three sensors into solid state memory. The tool records data at programmable time intervals. Upon retrieval of the tool from the wellbore, the tool may be connected to a computer for downloading of the raw data and subsequent analysis.