Geological risks in the project development on the territory of the Semakovskoe gas field

The article illustrates the relevance of the probabilistic nature of the input data, geological structure, using basic engineering solutions, look-ahead calculations, development parameters, taking into account project effectiveness evaluation (as exemplified by Semakovskoe gas field).
Materials and methods
To construct 3D geological-technological model "Schlumberger Eclipse" simulator was used, cost-effectiveness analysis of engineering parameters of field development plan was carried out, according to the methods of economic efficiency evaluation of investment projects in the form of capital investments of JSC "Gazprom" (09.09.2009, No. 01/07-99).
Results
The comparison of calculations of Semakovskoe field technological development helps to identify the sustainable projected level of gas production in comparison with possible risks due to increased activity of the bottom waters: possible change of ultimate gas recovery ratio does not exceed 0.5%. However, it should be noted that as a result of increased activity of the aquifer basin it is necessary to add repair works on wells for water insulation of strata’s watered intervals, which lead to additional economic expenditures for carrying out these works.
Сonclusions
The results prove practicability of evaluation and geological risks inventory, forming basic engineering solutions at the design stage of development. The necessity of further investigations in the area, standardization of the related procedures and creation of controlling documents, is evident.