Research and Utilization of Downhole Dynamic Corrosion Test Device

Abstract

With the lengthen of the production time continuously, and the adjustment and implementation of development programs constantly, the situation of Jiangsu Oil field well casing will become worse, even damaged gradually, while corrosion is one of the main factors to cause casing leakage in Jiangsu Oil field. In order to study the corrosion mechanism and influencing factors, we developed downhole dynamic simulation experiment device. The device is mainly composed of the recycle loop system, temperature control system, pressure control system, the main riser, and the buffer vessel. It implements the control of factors impact on the oil casing corrosion such as temperature, partial pressure, flow rate etc and helps us study the corrosion behavior of downhole tubing and casing. The results of weightlessness and electron microscope scanning show that the flow velocity and flow pattern is the main factors of maximum casing corrosion near the oil pump suction rate, and the local corrosion by CO2 is given priority to, this is consistent with the situation of field casing corrosion. It also shows that this experimental device has the advantages of reasonable structure, stable and reliable performance, easy operation, strong simulation and practicality.