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Method for Optimal Well Pattern Estimation for Oil Rim Fields


 The effective development of thin oil rims by horizontal wells is an urgent area of technological development of oil and gas companies in the context of an increase in the portfolio of new fields with significant reserves of free gas. A key feature of the development of oil rims is gas coning and therefore it is necessary to limit the productivity of wells, which leads to a high sensitivity of project profitability to reservoir properties, economic conditions and the development system. For successful development it is necessary to optimize all the components of the project – wells count, downhole equipment, transport system.
 Some works relating to the theory and methodology of developing oil rims describe approaches to calculating the optimal well spacing [Khasanov et.al.], the number of wells per bush [Samolovov, Mozhchil et.al.], and ground facility [Povyshev et.al.]. Special cases of comparing different well placement systems are widely represented in the literature, for example, in [Sugaipov et.al.]. An increase in the share of oil rims production leads to the need to find common solutions to such optimization problems.
 In this paper, we consider the question of determining the optimal location of wells by systematic selection of an in-line or radial development system. When horizontal wells are placed on oil rims in the form of an in-line development system, optimal conditions are created for the uniform production of oil reserves, since the distance between the horizontal wells is the same for all cross sections of the well and the gas cone is formed uniformly along the direction of the horizontal wells. However, when combining well trajectories into one bush, in this case there is a need for large reach from the wellhead or in a small number of wells in the bush. When horizontal wells are placed on oil rims in radial development system, optimal conditions are created to minimize well reach, however, interference occurs between wells in the reservoir due to the distance between wells changing along the direction of the horizontal wellbore. The purpose of the work is to determine the conditions under which in-line or radial well placement is optimal.