Villafortuna-Trecate ( Italy ) oil field is one of the deepest hydrocarbon deposit in production with a reservoir pressure over 15 Ksi, bottom hole temperature in the range of 380 °F and corrosive environment due the presence of carbon dioxide and hydrogen sulphide in the production fluids.
The design of Villafortuna-Trecate completions requested effort in the selection of appropriate equipment and materials that would enhance the safety, longevity and production capacity of the wells.
The paper will discuss the dual completion design outlining the supporting logic and concepts together with the equipment innovations utilized.
It includes discussion on tubing material and design, tubing connection, wellhead equipment, completion schemes and related equipment, annulus fluid and displacement technique. Quality control aspects are also discussed.
It should serve as a general example of conditions unique to deep, high pressure, high temperature corrosive wells and should be of interest to engineers facing a similar task.