SEW – Safety Evaluation of Wells

The well is set up with its corresponding operation parameters as realistically as possible for assessing its integrity in SEW. Some of the main points here are:

• A definition of its geological characteristics with the respective corresponding formation properties, pressure conditions, corrosion potential, density, heat conductivity etc. for each stratum.
• A detailed description of the drilling path
• The precise execution of the well completion with the aid of element databases (e.g. dependent on the casing string, landing nipple, dimensional transitions, different types of packer etc.)
• A definition of the casing strings in terms of dimension, material, transition between the completion elements etc.
• Different life phases of the individual casing strings can also be taken into account (e.g. conditions on the casing strings during the leaching process and the later storage operation with cavern wells).
• Trend analyses and calculations carried out with the aid of input parameters (e.g. wall thickness reduction through corrosion over a given time period).
• Measurements carried out (e.g. wall thicknesses, ovalities) can be taken into account.
• A possible simulation of the different parameter variations in terms of the load conditions that occur.

As a result, the loads in the completion are calculated from the given parameters. A safety coefficient is calculated using the previously defined material parameters and compared with applicable standards or operator criteria.

Through continuous further development, the “Safety Evaluation of Wells” software is used to evaluate integrity in accordance with applicable standards.