Research On The Response Relstionship And Parameter Selection For The Casing Resistance Detects

In the oil industry, a large number of metal casing is widely used. Due to formation stress,corrosive gases and liquids exist and harsh environmental factors, making a variety of buriedmetal pipelines will cause corrosion, perforation, deformation, fracture and other damage tosome degree. Oil and gas field development process influenced by casing damage, seriousdamage will make the pipeline failure, resulting in the pipeline card, plugging, leakage andother accidents, resulting in significant economic losses and environmental pollution. So themetal casing corrosion detection, which can effectively avoid pipeline accidents or mitigatethe harm and loss of property.At present, there are many kind of detection methods for casing corrosion defects.Butdifferent detection methods has its own conditions of use and scope of application. Astechnology advances, we are increasingly high requirements for pipeline detection. This paperaims to provide a new corrosion measuring method of metal pipe through resistance detectiontheory, and research on the feasibility analysis for resistance detecting method principle.Through the finite element analysis software COMSOL Multiphysics for a large number ofsimulation, creating potential and current distribution in different casing corrosion defectmodels, and analyzing the relationship between potential and current distribution andcorrosion defect. These distributions show intuitively that stimulating electrode, potentialelectrode, electrode distance parameters effect on the measurement accuracy, depth ofinvestigation and resolution. The results are important for how to design equipment parameters,and change the electrode distribution focus to achieve the best measurement.