Building and Application of Integrated Model of a Large Sakhalin Offshore Oil and Gas Condensate Field

摘要

Integrated modeling is a tool of managing a process of hydrocarbon production from an asset, which consists of downstream and upstream elements. Integrated model subsequently covers complex relationships between reservoirs, wells, pipelines and elements of subsurface infrastructure. In many ways, efficiency of oil and gas field development depends on these relationships [1]. For this reason, modeling of a hydrocarbon production process should embrace a whole chain (from upstream to downstream) and integrated modeling is best suited for this task [2]. The main purpose of this work was to evaluate the possibility of well operation condition optimization with account of subsurface infrastructure using integrated modeling tools. The paper gives a review of a modern approach to modeling a large Sakhalin offshore oil and gas condensate field, the X Field. Oil producers have been drilled from the shore into oil rims of reservoirs with record-breaking horizontal offset in the oil and gas industry. Initial oil rates exceed 3000 ton/day. However, the field development is complicated at the moment, due to gas breakthrough from the gas cap which leads to a critical decline in well performance. An integrated model includes simulation models of two oil/gas reservoirs, well models, and a model of single gathering system. The paper briefly describes the approach to building and matching the integrated model. After building and history matching of the integrated model, sensitivity of oil production to a change in well operation condition was analyzed. Also, mutual well influence on the gathering system level was evaluated. As a possible scenario for well operation condition improvement an intermittent well operation was considered. The results of model runs demonstrate that a change in well operation conditions won't positively affect oil production in short period.