In the CO

2

flooding environment

puncture occurs frequently in the gathering and transportation pipeline network composed of carbon steel pipelines. So it is of great significance to reduce corrosion and maintenance costs by using reinforced plastic non-metallic pipes instead of some metal pipes. Corrosion immersion experiments are conducted to study the changes of permeability

expansion and mechanical properties of swelling and mechanical properties of flexible composite pipes and aramid glass steel pipes under high salinity and CO

2

content with immersion periods. The results show that as the immersion periods increases

the permeability and expansion rate of the two non-metallic materials increase

but the tensile strength d

ecreases. Among them

aramid glass steel pipe has higher permeability

relatively smaller expansion rate

and higher tensile strength. The flexible composite pipe has the smaller permeability

a relatively larger expansion rate

and the smaller tensile strength. After the strength check relay on the changed mechanical properties

both materials can meet the gathering and transportation pressure requirements of 3 MPa. Based on the experimental results

the maximum allowable pressure for different pipeline specifications is calculated.