Analysis of formation properties and configuration impact on the oil recovery factor during the production of oil and gas condensate fields

Relevance. A significant share of oil reserves is contained in the oil rims of gas or gas condensate fields. The strategy and sequence of development of oil and gas parts of such fields largely determines the amount of oil, which will not be produced. Effective use of the chosen development strategy is impossible without considering the individual characteristics of the reservoir. Aim. Analysis of the configuration and properties of the reservoir and the technological mode of operation impact on the oil recovery factor to select the most effective development strategy using reservoir simulation. Methods. Simulation of the development of an oil and gas condensate field is carried out in the tNavigator software package of Rock Flow Dynamics based on a system of multiphase filtration equations. The parametric analysis of the influence of the depth of the oil-water contact, the type of oil rim, the development strategy, anisotropy, permeability and M-factor on the dependence of the oil recovery factor on its flow rate is carried out. Results and conclusions. As a result of simulation, it was found that the primary development of the oil rim allows achieving large oil recovery factor compared with the simultaneous development of the gas cap and the oil rim. In the case of a small distance between the surfaces of gas–oil and water–oil contacts, it is necessary to implement a strategy in which gas production begins almost simultaneously with oil production. It is established that the presence of an optimal oil flow rate is caused by increase in the pressure drop between the gas cap and the oil rim in the well area, accelerating the presence of the gas breakthrough to producers. It is shown that for edge-type oil rims, the lateral permeability value contributes more to the presence of the cone formation effect than the vertical one. In contrast, high values of the reservoir anisotropy coefficient have a negative impact on oil recovery for the underlying type of rim.