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BS EN 15112:2022

BS EN 15112:2022

$154.14

External cathodic protection of well casings

Published By Publication Date Number of Pages
BSI 2022 38
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This document provides information on methods suitable for assessing the likelihood of leakage due to external corrosion of well casings and to evaluate the need for cathodic protection, as well as methods of providing cathodic protection to the external part of these wells in contact with the soil. It also defines requirements for monitoring of performance of CP systems. Onshore and offshore wells are included in the scope. However, for offshore wells where protection is provided by anodes on the wellhead structure, it is recognized that it might not be practical to achieve full protection of well casings. This document applies to any gas, oil or water well with metallic casing, whether cemented or not. However, in special conditions (shallow casings: e.g. 50 m, and homogeneous soil), EN 12954 can be used to achieve the cathodic protection and assess its efficiency. The general requirements of EN 12954 apply; this document details additional, specific, requirements for CP of well casings. This document applies to production and injection wells. References later in this document to production also apply to injection.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms and definitions
11 4 Cathodic protection personnel competence
12 5 Description and assessment of corrosion risks
5.1 General
5.2 Description of corrosion risks
13 5.3 Corrosion risk assessment
5.3.1 Data collection during initial survey
5.3.2 Data collection during drilling
5.3.3 Data collection in service
14 5.3.4 Data collection during workover
6 Prerequisites for application of cathodic protection
6.1 General
6.2 Electrical continuity
15 6.3 Electrical isolation
6.3.1 General
6.3.2 Particular situations
16 6.4 Cathodic protection equipment
6.5 Groundbeds
6.6 Safety requirements
17 7 Design of the cathodic protection
7.1 General
7.2 Voltage drop profile method
7.3 Polarization curve method
18 7.4 Simulation of the cathodic protection for a well
7.5 Design based on historical data
8 Measurement of the well-casing-to-soil potential at the wellhead
8.1 General
8.2 Measuring points
19 8.3 Method used for potential measurement – Interpretation
8.4 CP System testing, commissioning and documentation
20 9 Additional cathodic protection equipment
10 CP System Monitoring, inspection and maintenance
21 Annex A (informative) Voltage drop profile
A.1 General
22 A.2 Principle
A.3 Method
23 A.4 Analysis of the curves
24 A.5 Practical considerations
25 Annex B (informative)Polarization curve method applied to a well
B.1 General
26 B.2 Practical considerations
27 Annex C (informative)Calculation of the potential shift at the bottom of the well casing and the well casing to soil resistance
C.1 Purpose
C.2 Principle
28 C.3 Definition of terms and coefficients used in the equations
C.3.1 Symbols and definitions
30 C.3.2 Characteristics of a segment k
C.3.2.1 General
C.3.2.2 Total cross section of the segment k: Sk
C.3.2.3 Longitudinal resistance per unit length: rk
C.3.3 Coefficients used in the attenuation equations
C.3.3.1 Attenuation factor: ak
31 C.3.3.2 Characteristic resistance:
C.4 Calculation – General attenuation equations
C.4.1 General attenuation equations
C.4.2 Method for solving the equations system
32 C.4.3 Calculation procedure
33 C.5 Calculation procedure example

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BS EN 15112:2022
$154.14