Integrated Approach to Managing of the Offshore Field Development Based on Example of the Yu. Korchagin Field and the V. Filanovsky Field
Authors: Skobeev Andrey , Senkov Alexander , Danilko Alexey , Volkov Vladimir , Akhmadiev Ruslan 
Published: October 2017

The requirement of the use of models in the of oil and gas condensate fields development is determined by the legislation of the Russian Federation with regard to application of hydrodynamic models. Thus, an absolute majority of oil and gas companies create and use topical hydrodynamic models within the existing legislation. However, if we talk about the practical application of models for solving the applied problems of developing oil and gas condensate fields, the use in calculations only hydrodynamic models will not allow taking into account the characteristics of used downhole equipment, gathering and processing system

Application of integrated approach permits to link "reservoir-well-gathering facilities" as a single whole.

An integrated model is a model that combines all the key components of field development, such as a productive formation, wells and a collection network. The decision to create an integrated model was the need for an operative change in the operating practices of the well stock operation in the conditions of technological limits during operation of technological complex. It is expected that the integrated model will allow to calculate the production of liquid, oil, gas, taking into account all the constraints in the existing production system, and also to estimate design capacity of newly developed fields. Additional requirements have been introduced for the integrated model: it must be expandable (for further use of the model of target reservoir), the time of full modeling and forecasting for a month should not exceed more than 24 hours.

This article is an example of the construction and application of an integrated offshore field model. Within the example, the field includes two production targets that have a hydrodynamic relationship between themselves.

The following functional areas were identified for which it is planned to use integrated modeling as applied problems:Production plan optimization;Development of operating practice for production wells;Development of 24-hour forecast for a month in respect of production wells;Modeling of the current and newly commissioned fields;Evaluation and updating parameters of well performance;Engineering of downhole equipment and process equipment and etc.;

The article describes the main problems encountered by specialists of LUKOIL-Nizhnevolzhskneft LLC in integrated modeling development/actualization, as well as examples of its use for solving applied problems.

In the course of the project, a common methodology was developed for the making/updating a single integrated modeling, uniting a reservoir model, well models, collection systems and reservoir pressure maintenance. Application of PVT Black Oil was reasoned both for the reservoir and wells. Results of PVT-modeling were applied in multiphase flowmeter as well. A consolidated reservoir model was made consisting of two production targets. This model was successfully adjusted for the production history and adequate forecast for reservoir pressure were demonstrated. Well models were calibrated based actual data of multiphase flowmeter, borehole and surface transmitters (oil production, liquid rate, gas rate; wellhead pressure, line pressure, bottom hole pressure; line and BHT), well test results (reservoir pressure, production ratio). Well bore fluid in the gathering network was modeled with Black Oil. Elaborated integrated model demonstrated consistency in description of PVT reservoir fluid properties.

Integrated model was used to complete the following process tasks: Production plan optimization;Development of operating practice for production wells;Modeling of ICD completions and optimization;Gas lift system engineering;Optimization of well connection to separation stages.