The paper describes approaches of the Verkhnechonskoye field development design under uncertainty. Data integration examples for design of the full field development plan are given. Risk management strategy is described. Efficiency analysis of initial reservoir development decisions is made. Approaches to the field development scientific and engineering support are described. Greenfield project typical and unique problems and solutions examples are given (i.e. full field development strategy design, salty sandstone reservoir waterflooding).

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Uncertainty analysis as decision making tool for green fields of Yamal region Biryukov S. D., JSOC «ROSPAN INTERNATIONAL», Zakirov I. S. JCS «TNK-BP management», Severinov E. V., Gaidukov L. A., JSOC «ROSPAN INTERNATIONAL», Miroshnichenko A. V.; Kudlaeva N. V.; Endalova Y. V. ; Chameev I. L., TNK-BP, LLC «TPRC» AbstractThe new green fields of Yamal region and Eastern Siberia today is one of the important areas for oil production during next 10 years. One of the key problems of field development in these regions is poor infrastructure and lack of input data of geology, target formations and fluids properties. For decision making during field development preparation stage its necessary to carry out estimation of possible scenarios.Analysis of uncertainty will provide a range of changes in reserves and oil production profiles which can help to estimate economical part of field development project. Also these results can be used for design pipe lines and surface facilities.Authors of paper suggested the approach how to estimate uncertainties in cases of lack input data of formation based on data of Russkoye oil field.

Nuclear fuel cycle is a complicated and sci ence intensive engineering system, which includes numerous parts. Its completion phase is management of the spent nuclear fuel after it has been unloaded from the reac· tor core. This phase is the most potentially dangerous in the ecological sense since a can· siderable amount of radioactive nuclides with the half-life values from days to thousand years is generated inside the core within the nuclear fuel operation. It increases activity of the spent nuclear fuel by factor of 104_106 in comparison with the fresh fuel and as a consequence an acute problem of spent nuclear fuel processing and nuclear waste disposal arises. The most short-half-life nuclides decay within the spent fuel cooling period, and so the greater part of radioactiv ity is brought in by isotopes with half-life values making up tens of years. Several methods of nuclear waste disposal are being used in our days: vitrification and bituminisation with following long-term stor· ing; SHS·using immobilization method (fixa tion the waste in metal-containing mould). Moreover. such exotic projects as so called "space disposal" do exist. Nevertheless, until now the most widely used method of the nuclear waste isolation is the underground disposal -pumping the water solutions of the salt waste compounds into the deep under ground tanks lying at the distance of hun dred-thousand meters under the earth's surface. The radioactive decay goes on inside the waste disposition area, therefore the tern· perature of the waste increases. Conse quently, the pressure inside the bed goes up. This fact, together with the corrosion of the borehole shell, may cause radioactive leakage out of the isolated area. It is also important, that all the countries that have ever run a nuclear reactor face the problem of the nuclear waste disposal. The spent fuel generated by the nuclear reactors must be processed and nuclear waste isolated using any proven method, even if the country had afterwards shut down its reactors and reduced national nuclear program. The object of the given work is a calcula tion of multi�dimensional temperature distri bution inside the bed, which the nuclear waste are pumped in. It allows to compute the pressure field inside the ground bed sur rounding the waste disposition area and con sequently to estimate the extent of the diffusion of the radioactive nuclides out of the isolated area. Heat-conductivity coefficient, heat-energy capacity, density of the system and heat sources intensity may not be expressed by an analytical function of coordinates and time therefore this task does not have analytical solution. This work gives the description of multi-dimensional heat transfer model in the area of liquid nuclear waste underground dis posal. its numerical realization and the results of simulation of two-dimensional sta tionary heat transfer task. The following assumptions were used in the model of heat transfer: • nuclear waste are placed in cylindrical areas. The axes of these areas coincide with the axes of the ...

The deterioration of the reservoir properties of potential oil and gas bearing areas on mature and green fields, as well as the increase in the volume of hard-to-recover reserves on low-permeable reservoirs set us new challenges in searching and using effective development technologies to maintain and even increase the oil production levels. Based on successful international experience, Russian oil and gas companies use horizontal wells (HW) with multi-stage hydraulic fracturing (MSHF) for the cost-effective development of low-permeable reservoirs. Thus, since the first pilot works of drilling technologies and completion of HW with MSHF in 2011, at the beginning of 2020, over 1,200 HW with MSHF were drilled and came on stream at the fields of LLC RN-Yuganskneftegaz, about half of which are at the exploitation play AS10-12 of the northern license territory (NLT) of the Priobskoye field. In searching the best technologies and engineering solutions, the company tested different lengths of horizontal section of HW, the number of hydraulic fracturing (HF) stages and distances between hydraulic fracturing ports, as well as different specific mass of the proppant per frac port. Recently, there has been a tendency in design solutions to increase the length of the HWs and the number of hydraulic fractures with a decreasing distance between the frac ports and a decreasing specific mass of the proppant per frac port. This work studies the actual and theoretical efficiency of HW with MSHF of various designs (different lengths of horizontal section of HW and the number of HF stages) and to assess the viability of increasing the technological complexity, as well as to analyze the actual impact of loading the proppant mass per port on performing HW with MSHF. The study is based on the results of the analysis of the factual experience accumulated over the entire history of the development of the exploitation play AS10-12 of the NLT of the Priobskoye field of the Rosneft Company. In studying the viability of increasing the technological complexity, especially, increasing the length of horizontal section of HW, increasing the number of HF stages, and reducing the distance between the frac ports: we discovered the typical methodological errors made in analyzing the efficiency of wells of various designs; we developed the methodology for analysis of the actual multiplicity of indicators of wells of various designs, in particular, HW with MSHF relative to deviated wells (DW) with HF; we carried out the statistical analysis of the actual values of the multiplicity of performance indicators and completion parameters of HW with MSHF of various designs relative to the surrounding DW with HF of the exploitation play AS10-12 of the NLT of the Priobskoye field; we performed the theoretical calculation of the multiplicity of the productivity coefficient for the HW with MSHF of various designs relative to DW with HF for the standard development system of the exploitation play AS10-12 of the NLT of the Priobskoye field; we compared the actual and theoretical results. The paper also presents the results of studying the actual effect of changes of proppant's mass per port on performance indicators of HW with MSHF of the same design and with an increase in the number of fractures of the hydraulic fracturing without changing the length of horizontal section of HW. As for performance indicators, being the basis for estimating the efficiency of HW with MSHF of various designs, we used the productivity index per meter of the effective reservoir thickness and the cumulative fluid production per meter of the effective reservoir thickness per a certain period of operation. And as the completion parameters, we used the length of the horizontal section of HW, the number of HF stages, the distance between the frac ports, and the specific mass of the proppant per meter of the effective reservoir thickness per frac port. The results of this work are the determining vector of development for future design decisions in improving the efficiency of HW with MSHF.