Electro-impulse method for the workover of a scale-narrowed borehole (EVA)

The EVA project aims to demonstrate that typical scales in oil, gas and geothermal wells can be removed using EIV. The initial focus is on the removal of mineral scales within underground plant components such as casings, production pipes and filter pipes. The feasibility of the project will be demonstrated in a simple, laboratory-based experimental setup. In addition, a design of a workover system will be developed.

The EVA project is composed of 3 phases. In the first phase of the project, the feasibility of an EIV system for scale removal is to be demonstrated and a functional laboratory prototype developed. This prototype shall be adapted to the conditions of a well down to 5000 m depth. In the 2nd phase of the project, the laboratory prototype already developed will be further developed into a field prototype suitable for practical use, which can then be used in a real well. The most important aspects in this development will be the connectivity to existing equipment, the permanent temperature suitability, the use in deflected boreholes and the stability against the occurring mechanical loads. In the 3rd project phase, the field prototype will be further developed on the basis of the results obtained in phase 2. The focus here will be on material and performance optimisation. These will then also make it possible to further reduce the diameter of the prototype, which will enable both further bore diameters and the use for cleaning equipment above ground.

The prototype was developed and successfully tested.
The research report has been completed.