The resource base of Western Siberia needs to be replenished to maintain the current development indicators. The reserves associated with the classic structural traps were diagnosed and mapped for the main horizons in Western Siberia. Replenishment of the resource base at the expense of such reserves is ineffective due to the fact that undiscovered traps of these types are thin, or lie at great depths, which ultimately negatively affects the quality of the resource base and the economic efficiency of their involvement in development. The driver of the growth and replenishment of the resource base under current conditions is the Achimov deposits, which are ubiquitous in this area at depths of 2500–3500 m and are genetically deep-water deposits of fans. The advantage of involving these deposits in development is often associated with the confinement to existing assets, where production is carried out from above and below-lying geological objects, the complexity is associated with the lithological type of traps, which is not diagnosed by direct analysis of seismic materials, as well as the extremely poor knowledge of the deposits over the area. Considering that the variability of properties over the area is a distinctive feature of Achimov deposits, the factor of poor knowledge by drilling significantly complicates the understanding of the potential of the deposits. In order to identify and assess the most promising areas for involvement in the development of the Achimov deposits, in PJSC Gazprom Neft the work “Regional assessment and zonal study of the prospects for oil and gas potential of the Achimov formation in the Western Siberia” was carried out. The goal and objectives is to form a reliable tool for searching and forecasting potential options using the generated regional maps of criteria (various characteristic properties and their combinations) built on the basis of data generalization throughout Western Siberia.

Research of achimov formation geological aspects allows to develop a large number of lithological and non-structural traps prospecting technique. But forecast quality of these traps saturation is low. These results in significant increasing of exploration costs and production drilling risks. Therefore it is necessary to integrate the accumulated experience in the exploration and development of achimov formation, research the methods of forecasting and modeling water saturation.

The paper deals with the features of well operation at the Eastern part of Orenburg oil and gas condensate field (OGCF). We propose a complex approach to determining the parameters of the fractured formation: based on the mathematical model of Warren–Root fracture reservoir, we find the dependence of the well flow rate on time and parameters of fracture under conditions of maintaining constant bottomhole pressure. Next stage is an extrapolation of this problem for the case of arbitrary dynamics of flow rates and pressures based on the deconvolution theory. The search of parameters of double fracture formation is carried out by their variation in the corridor of admissible values in order to minimize the deviation of the calculated flow rate relative to the true one. To identify possible reasons for the decline in well productivity with a decrease in bottomhole pressure, numerical experiments were performed on synthetic hydrodynamic models to determine the main influencing factors that can lead to an observed decrease in well productivity with increasing depression. Based on the information received, multivariate calculations of sector models of the EP OGCF were carried out in order to determine the optimal operating parameters to maximize oil production or minimize specific operating costs, taking into account the identified complicating factors.

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.

The works associated with the construction of infrastructure facilities in the field require significant involvement of highly qualified specialists, high-quality implementation of these works and it requires adjustment of the developed project documentation directly in the construction process. PJSC «Gazprom neft» is faced with the task of increasing the efficiency of capital projects, in particular, reducing the time for their implementation. The faster the field is equipped and ready to start production, the sooner the capital investment in the project will pay off. The article discusses the method of organizing the construction (arrangement) using block-complete devices, namely one of its methods – superblocks. The essence of the method is the manufacture in the factory of modules, enlarged mounting assemblies, instrumentation and automation devices and their subsequent enlarged assembly into a large-capacity unit (superblock). The mass of the superblock can reach up to 1000 tons. The use of superblocks in the development of oil and gas fields guarantees high productivity, time saving and the quality of the facilities being built.

An approach to improving the project quality of a multi-layer field development, which allows to bring the project to the real conditions of the field development, to reduce its capital intensity is proposed. The key task is to find the optimal pads distribution pattern based on the development system of target operational facilities, which ensures the formation of development elements at dependent production facilities at the expense of transit wells. This takes into account the purpose and mode of wells operation. This arrangement of well pads should ensure minimal capital costs and technological risks in the implementation of the project due to multi-factor optimization. For this purpose, length and complexity of trajectory wells, infrastructure, natural and environmental restrictions on the field territory, technical restrictions in wells construction are taken into account. Such problem for multi-layer field is not solved by existing software systems. A method of grouping the project drilling targets, as a stage of well pads distribution, based on modified clustering method k-means is considered. The clustering algorithm is adapted to minimize the total penetration of inclined and horizontal wells, taking into account the complexity of their trajectories.

Article gives a comparative analysis of using road clothes made of graded breakstone and gravelly sand mixes (GSM) for autonomous oil fields located in the northern territories of the Russian Federation. Positive and negative characteristics of inert material delivered to the field are noted. There have been made calculations based on regulatory acts for road clothes of transition type with following analysis of their cost. The technology of making GSM on objects is also described. This technology includes preparation of a mixture on a separate pad directly on construction object. The possibility of including sand located nearly the construction object into the mixture is analyzed. Major advantages of using GSM during construction of roads using practical experience are reviewed. The condition of the cover during the operation period is shown.

The article provides the substantiation of the specific coefficient of corrosion influence, considered per unit of the limit of short-term strength of the metal, with the help of which it is possible to simplify the most approximate calculation of the limited endurance limit of steels of oil and gas equipment operating under cyclic loads, as well as perform subsequent resource calculations.

An integrated laboratory study of low permeable carbonate reservoir (dolomitic limestones, Sarqala field) included a digital rock (DR) workflow that accelerated the time to complete the core analysis program, in a case when the standard is ineffective. All these data were used to justify the field development strategy.

The article considers а mathematical model of analyzing the feasibility of an upstream project (correctional
resistance model), including the formation of redundancy for correction’s implementation aimed at increasing
the probability of project execution within the target efficiency metrics to the desired value of the project realization
probability, as a result it allows to speak about the transition to a qualitatively new level of cooperation between
stakeholders of the project, including through partnerships. This approach is applicable at all stages of oilfield
development project lifecycle, for the accumulation and improvement of the project knowledge base, which
is valuable for each of the project participants and significantly increases with an integrated approach to the
project management.

Quantitative assessment of risks and uncertainty has always played the most important role in the evaluation of oil & gas projects. Any estimated, measurable or evaluable magnitude contains an uncertainty, whether it concerns measuring watercut by means of a multiphase flow meter (MPFM) or to the net present value (NPV) of a major E&P project. Evaluation of project economics, e.g. the calculation of net present value (NPV), internal rate of return (IRR), OPEX and CAPEX shall be probabilistic, i.e. carried out with the quantitative assessment of risks and uncertainty of estimated (predicted) values. Nevertheless probabilistic estimate takes place very rarely. Most commonly, assessment of risks and uncertainty would be intuitive or based on a number of deterministic scenarios mistakenly referred to as pessimistic, optimistic and most probable. This research simulates failure to achieve target economic efficiency of E&P projects with no quantitative assessment of risks and uncertainty, and reviews previous international research conducted to identify the effect of ignoring probabilistic estimates related to the evaluation of E&P projects on their final economic efficiency.