The oil rim reserves development suggests complexity in maintaining the balance of gas and oil withdrawals from the reservoir, choosing the optimal well design and geosteering, justifying well operation conditions, etc. In addition, gas and oil reservoir can be complicated by diagenetic alterations of deposits, blocked structure, abnormal thermobaric conditions. The paper presents the results of conceptual approach to the Botuobinskiy horizon’s oil rim development design at the Chayandinskoye oil and gas condensate field with the presence of the above complications. This experience can be applied to assess the majority of fields in Eastern Siberia.

Главная цель Научно-Технического Центра «Газпром нефти» («Газпромнефть НТЦ»)повышение нефтедобычи и ее эффективности за счет внедрения новых технологий и проектных решений на месторождениях «Газпром нефти». НТЦ обеспечивает аналитическую, методическую и научно-техническую поддержку процессов разведки и добычи нефти.

The work is aimed at the optimum program of additional appraisal for the object with high investment risk level. The investigated object is related to non-structural oil reserves and stands along from the infrastructure nodes with exploitation wells. Therefore, the work consist of the probability based reserves estimation for the all possible project ways and maximum effective way choice with the save of economically profitability. Optimization program is concerned as to the project realization way as to the additional appraisal program. In the case of additional appraisal program three pilot wells drilling time and expenditures were considered. All three wells planed and calculated with standard well logging tools. As an alternative the exploration wells re-entry were considered. Facies distribution features and petrophysical properties were examined as uncertainties. The main point was haw they influence on the exploitation method. For this point of view, approximately 3000 realizations with different combinations of petrophysical properties, sedimentation facies geometrical sizes and type of exploitation were calculated. Result of optimization shoed that the optimum way is connected with consistent exploration wells re-entry, in spite of possible long term operations because of possible troubles. These optimization calculations give decision tree with probability and parameters values for every decision point for the further operations. Geologist, reservoir engineers or economists who deals with the high investment risk projects where geology, exploitation and infrastructure uncertainties take place may use similar approach.

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