Development of oil, gas and condensate fields assumes simultaneous production of both free gas with condensate and oil with breakthrough gas. In this case, infrastructure solutions must be flexible and maximally fit for purposes of collection and treatment of all produced fluids. Joint planning of field development and infrastructure arrangement takes on a great importance as it is necessary to align solving of subsurface hydrodynamics, transportation of products in wellbore and collection system problems. A great number of producer companies throughout the world use the "Formation-Well-Surface Infrastructure" integrated models for planning of development and infrastructure arrangement which allow forecasting the performance factors with a high degree of accuracy covering not only field development and geological aspects but the limitations of the surface infrastructure, including pipelines, areal facilities and economic conditions. The most important task of the integrated modeling is the correct forecast and optimization of performance factors with account for all existing limitations of reservoir, well design, downhole equipment, products collection and treatment system. This article considers the existing "Formation-Well-Surface Infrastructure" model of one of the multipay oil, gas and condensate fields of the Western Siberia. Description of the integrated model development stages is given which includes a creation of digital models of oil and gas wells with complex completion systems, models of collection systems for all products and a reservoir simulation model of the field. Examples of a solution of application tasks for optimization using the generated integrated model are given which allow significantly improving quality of the adopted solutions by covering of all production system components "from reservoir to collection and transportation of hydrocarbons" integrated into a single model.

Recovery of tight oil reserves related to thin under-gas rims complicated by a presence of bottom water represents a crucial task for a huge number of operators throughout the world. The main problem of development of such reserves are represented by almost inevitable processes of gas and water coning leading to gas and water breakthrough to the bottom of producing wells which in its turn affects process and economic performance indicators of development and prevents reaching high oil recovery factor (ORF) values. This article represents an efficient approach to recovery of tight oil reserves related to thin under-gas rims with bottom water providing for the use of multipurpose wells with complex design allowing efficiently using the gas cap energy and managing the risks related to water coning.

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One of the most important challenges of the current stage of the field development is selection of concept of infrastructure system development and solution of classical problem of optimization: Minimization of capital expenditures for infrastructure development, Minimization of cost of production, treatment and intra-field transportation of the raw material to the LNG plant, Ensuring of high reliability of the entire infrastructure system for continuous flow of raw material to the LNG plant trains. Reaching of the field performance targets, namely: - Duration of the period of continuous gas production - Hydrocarbons recovery factors Besides, in designing of the infrastructure system and accordingly, in selection of the solution, it is necessary to take into account the following factors representing complexity of the future industrial activity in general: Geographical location of the field in the area with challenging climatic (arctic) conditions which calls for the necessity of maintaining of high level of self-sustainability in the field; Considerable differences in values of formation and accordingly, wellhead pressures of the production wells stock; Taking an optimal decision in part of concept of infrastructure development in these challenging conditions is possible only on the basis of the complex integrated digital model "Well - Reservoir - Gathering network - Treatment system" allowing for correct evaluation of engineering parameters of field development with account for the effect of existing limitations related to reservoir, well design, downhole equipment, gathering system and production treatment. Solving of this problem using the up-to-date modeling technologies accounting for mutual effect of all elements of the system on the basis of multi-disciplinary teams includes the following: Generation of the integrated models "Reservoir - Wells - Gathering system - Treatment system - In-field transport system to the LNG Plant Inlet", Separation of individual types of process design calculations for analysis with consequent incorporation into the integrated model, Carrying out of multi-option calculations of engineering parameters of development and infrastructure, Assessment of the results of calculations of engineering parameters of options by specialists of the multi-disciplinary team, Economic assessment of costs of implementation of the studied options. Using the above mentioned approach with involvement of the integrated field model, multi-option calculations of location and parameters of production treatment facilities and dynamic calculations of flow lines operation parameters for various scenarios of the LNG plant were performed.