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Research On Cluster Well Group Casing Cathodic Protection For Field Test And Optimization Of Anode Bed

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.

Product Number: 51322-17724-SG
Author: Dawei Zhuang, Qian Zhao, Yanxia Du, Xiaoyong Wang, Qiongwei Li
Publication Date: 2022
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Cathodic protection (CP) is often used to protect steel well casings from external
corrosion. However, it is difficult to measure the CP potential distribution along the
well casing, which brings about difficulties on CP design and effectiveness evaluation.
In this paper, the polarization characteristics of casing steel in different soil layers were
obtained by polarization testing at different soil depths in the field. Based on measured
polarization characteristics, geometry of well casing and soil resistivities of different
soil layers, a numerical simulation model for CP of well casing was established. CP
current requirement and CP potential distribution of well casings were estimated by
calculating and field testing. Additionally, the effects of soil resistivity and casing
polarization characteristics on CP potential distribution of well casing were studied by
numerical simulation.

Cathodic protection (CP) is often used to protect steel well casings from external
corrosion. However, it is difficult to measure the CP potential distribution along the
well casing, which brings about difficulties on CP design and effectiveness evaluation.
In this paper, the polarization characteristics of casing steel in different soil layers were
obtained by polarization testing at different soil depths in the field. Based on measured
polarization characteristics, geometry of well casing and soil resistivities of different
soil layers, a numerical simulation model for CP of well casing was established. CP
current requirement and CP potential distribution of well casings were estimated by
calculating and field testing. Additionally, the effects of soil resistivity and casing
polarization characteristics on CP potential distribution of well casing were studied by
numerical simulation.

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