Internal Corrosion Characteristics and Control Scheme of Gathering Pipeline in a Western Oilfield

The transport medium of the gathering pipeline in a western oil field had the characteristics of high salinity, high chloride ion and S^2-, SRB, resulting in serious underdeposit corrosion in localized pipeline. In order to control corrosion in oil field gathering and transportation pipelines, the current corrosion control technology in oil and gas field pipelines was investigated and analyzed, the economic comparison was carried out, and the corrosion control strategy of gathering and transportation pipeline was finally formulated, which mainly included the application of non-metallic pipeline, internal penetration and internal extrusion coating. The techniques of extruded coating, interspersed pipe, 32 MPa high pressure flexible composite pipe and polyethylene lined glass reinforced plastic composite pipe have been tested and evaluated in the field. These techniques have been applied in the construction of the leak-free demonstration area, and acheived good effects.