Evaluation Technique of Downhole String Erosion and Corrosion under Complex Environment

A kind of evaluation technique has been developed which includes an experimental apparatus and test method. The technique can evaluate the impact of erosion and corrosion to downhole string in a complex environment such as high temperature, high salinity, CO₂ or H₂S. It is difficult to control the quantity of particles in the previous methods which intake the particles by siphoning. This technique can solve the problem through the use of a screw feeder and can evaluate the impact of erosion and corrosion at the same time. It will help to study the damage mechanism of downhole string caused by high temperature, high salinity, CO₂ or H₂S. It also has an important significance to guide the optimal design and material selection of downhole string.