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Deep well casing is an important part of oilfield production. In the long service life of well casing, corrosion can result in wall thinning and even perforation of the casing due to contacting with soil, water and other naturally occurring substances within the formation. The most economic and effective method to decrease corrosion of well casing is cathodic protection (CP). However, the vertical depth of casing is several kilometers, and CP current requirements of casing in different layers are quite different. At the same time, the conductivity of different formations will affect the distribution of CP current.
Cathodic protection (CP) is often used to protect steel well casings from externalcorrosion. However, it is difficult to measure the CP potential distribution along thewell casing, which brings about difficulties on CP design and effectiveness evaluation.In this paper, the polarization characteristics of casing steel in different soil layers wereobtained by polarization testing at different soil depths in the field. Based on measuredpolarization characteristics, geometry of well casing and soil resistivities of differentsoil layers, a numerical simulation model for CP of well casing was established. CPcurrent requirement and CP potential distribution of well casings were estimated bycalculating and field testing. Additionally, the effects of soil resistivity and casingpolarization characteristics on CP potential distribution of well casing were studied bynumerical simulation.
Oil and gas wells represent a large capital investment. It is imperative that corrosion of well casings be controlled to prevent loss of oil and gas, environmental damage, and personnel hazards, and in order to ensure economical depletion of oil and gas reserve. Wells placed in external corrosive environment shall be protected by appropriate barriers such as additional cemented casing, cathodic protection and coating to assure well casing integrity.
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Design issues with well casing Cathodic Protection - CP. Need for and benefits of CP discussed. Case history dealing with design issues and what solutions were available and utilized.