On-line monitoring technology for internal corrosion of CO2-EOR oil field.

Abstract In view of the fact that the internal corrosion of well bore is becoming more and more serious in the development of oil and gas fields in China, this paper develops an in-situ monitoring technology suitable for downhole deep corrosion rates, which including inductive corrosion probe, downhole data real-time transmission system, pressure and temperature sensor, etc. This paper introduced the development process of corrosion probe, the composition and function of each module. The device is based on the underground environment design. Through high temperature and high pressure test, the device can work steadily and reliably in the environment of 60 MPa and 125 ℃. Using this device to measure the corrosion rate of 20# in urban tap water and compare with the data measured by the hanging sheet method, it is proved that the device can reflect the actual corrosion rate. The monitoring instrument has been tested in Sheng li oilfield, the temperature and pressure sensors can work normally, and the corrosion rate obtained is in line with the actual situation of the environment and achieves good results. [ABSTRACT FROM AUTHOR]