Specifics of Development, Infrastructure Construction and Production of Oil-Gas-Condensate Fields. Integrated Model Application Experience

摘要

This article describes specifics of engineering work performed to develop oil-gas-condensate fields and build their infrastructure facilities. Unlike conventional reservoirs, it is not unusual that oil-gas-condensate fields cannot be produced by the artificial lift method (using electrical centrifugal pumps or sucker-rod pumps). The success of any efforts to increase efficiency of an oil-gas-condensate field development project depends on balanced decisions that need to be made when drilling, building infrastructure facilities and producing both the oil and the gas part of the field. To address this issue, the global industry leaders have developed special tools and technologies that will allow meeting the emerging challenges. The goal of this work is to introduce and adapt new technologies for assessment, planning and management of oil-gas- condensate assets. The proposed tools and algorithms can be used to identify possible losses and constraints across the entire Reservoir-Well-Infrastructure value chain. Based on analysis of reservoir and wellhead interferences, a balanced system can be created with the highest technical and economic parameters possible. These algorithms have proven to be highly efficient as is shown by the example of an integrated development concept for Yaro-Yakhinskoe and Novoportovskoe oil-gas-condensate fields. Yaro-Yakhinskoe oil-gas-condensate field is characterized by a fairly rapid transition from oil production to gas production, with a multi-fold increase in wellhead pressure. Because of the wellhead interference, taking into account the well drilling and commissioning schedule, joint operation of oil and gas wells results in a significantly lower production plateau and, consequently, poor economics of the project. Such integrated approach has allowed the field operator to come up with a fluid gathering and treatment system configuration that ensures a profitable return. In case of Novoportovskoe oil-gas-condensate field, without an integrated Reservoir-Well-Infrastructure model the operator was failing to make consistent production and development decisions. Analysis of the reservoir and wellhead interference has identified the risks of not achieving the design wells flow rate numbers which would make the project uneconomical. Once the Reservoir-Well-Infrastructure model was developed the field operator could make targeted steps to ensure the desired field production performance. Capabilities of the integrated Reservoir-Well-Infrastructure model are not limited to the conceptual engineering stage. At present, mechanisms are being developed to use this model for day-to-day monitoring and planning of production activities, engineering of gas lift operations, balancing of reservoir pressure maintenance and gas re-injection system.