Operational limits for a stimulation vessel in the Northern Caspian Sea conditions

Abstract

This Master’s thesis describes the concept development of a stimulation and well service vessel and the evaluation of its operational limits in Northern Caspian Sea conditions during a whole year of operation (all 4 seasons). Possible options and solutions are discussed on the basis of the analysis of world experience and existing technologies for similar conditions. An integrated approach for solving this problem includes three parts:  The selection of the optimum vessel, that can be specially constructed or upgraded to carry all the equipment, that is needed to ensure the successful down-hole treatments in challenging marine and ice conditions.  The selection of the optimum deck equipment layout, which will satisfy the necessary parameters, such as vessel stability and efficiency for the chosen down-hole operations technology.  Operational limits discussion and risk evaluation. Suggestion of effective mitigation measures. To solve this problem analysis of up-to-date technologies and several types of calculations were provided, relevant geographical, environmental and reservoir data was examined. The most attention was paid to vessel selection, vessel modelling and stability calculations, ice resistance evaluation. Modelling of a vessel was performed in the “Free!Ship” software, ice resistance calculations are based on actual theoretical models. The obtained results were discussed and it was proven, that the chosen vessel is stable and can carry all the equipment, as well as that it can be used during harsh winter conditions. All calculations, analysis and proposed solutions were made in accordance with local rules and regulations. In conclusion, recommendations wrap up the thesis and summarize the whole research and key findings. The thesis was carried out in conditions of the limited initial data. The obtained results can be used for further concept development.