Identifying of Production Facilities (Reservoirs) at Multilayer Oil and Gas Condensate Fields in the Yamal-Nenets Autonomous Okrug

Abstract

The accumulated experience in the development of the multilayer oil and gas fields is sometimes evidenced by the inaccuracy of decisions in the area of identifying the production facilities used at the initial stages of development, when the amount of initial information necessary for design is very limited. A high degree of knowledge is typical for the drilled fields, when decisions regarding the identifying of production facilities are already taken and only their correction is possible. At the initial stages, the practice of combining a significant number of reservoirs into a single production facility has been often applied, which has led to the insufficiently complete production of the individual productive intervals, reducing the efficiency of the hydrocarbon extraction from the subsoil of the Earth. The paper presents a scheme for the identifying of the production facilities at the multilayer Yuzhno-Russkoye and Beregovoye oil and gas condensate fields, which consists of a stepwise analysis of each of the criteria for the possibility of combining the reservoirs into a single development facility presented in the paper. Decisions on the identifying of the production facilities according to the proposed algorithm were tested and entered into the feasibility study of the oil recovery factors at the mentioned fields. The proposed solutions make it possible not only to achieve high hydrocarbon extraction rates, but also to avoid a decrease in the economic efficiency in the late stages of the field development, caused by the need to drill an additional well stock when disconnecting the erroneously combined reservoirs at the initial stage.