EN 15112:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Description and assessment of corrosion risks
  4.1 General
  4.2 Description of corrosion risks
  4.3 Corrosion risk assessment
5 Prerequisites for application of cathodic protection
  5.1 General
  5.2 Electrical continuity
  5.3 Electrical isolation
  5.4 Cathodic protection equipment
  5.5 Groundbed
  5.6 Safety requirements
6 Design of the cathodic protection
  6.1 General
  6.2 Voltage drop profile method
  6.3 Polarisation curve method
  6.4 Mathematical approach based on a field test
  6.5 Simulation of the cathodic protection for a well
7 Measurement of the well-casing-to-soil potential at the
  wellhead
  7.1 General
  7.2 Measuring points
  7.3 Method used for potential measurement - Interpretation
8 Additional cathodic protection equipment
Annex A (normative) Voltage drop profile
Annex B (informative) Polarisation curve method applied
                      to a well
Annex C (informative) Determination by calculation of the
                      potential shift at the bottom of the
                      well and the well to soil resistance
Bibliography

This European Standard specifies methods used to evaluate the external corrosion hazards of well casings, as well as cathodic protection means and devices to be implemented in order to prevent corrosion of the external part of these wells in contact with the soil.This European Standard applies to any gas, oil or water well with metallic casing, whether cemented or not.However, in special conditions (shallow casing: e.g. 50 m, and homogeneous soil), EN 12954 can be used to achieve the cathodic protection and assess its efficiency.This European Standard also describes techniques allowing determination of the current required for protection and ensuring correct operation of the cathodic protection devices installed.