The development of markets for low-carbon energy sources requires reconsideration of issues related to extraction and use of oil and gas. Significant reserves of hydrocarbons are concentrated in Arctic territories, e.g., 30% of the world’s undiscovered natural gas reserves and 13% of oil. Associated petroleum gas, natural gas and gas condensate could be able to expand the scope of their applications. Natural gas is the main raw material for the production of hydrogen and ammonia, which are considered promising primary energy resources of the future, the oxidation of which does not release CO₂. Complex components contained in associated petroleum gas and gas condensate are valuable chemical raw materials to be used in a wide range of applications. This article presents conceptual Gas-To-Chem solutions for the development of Arctic oil and gas condensate fields, taking into account the current trends to reduce the carbon footprint of products, the formation of commodity exchanges for gas chemistry products, as well as the course towards the creation of hydrogen energy. The concept is based on modern gas chemical technologies with an emphasis on the production of products with high added value and low carbon footprint.

The paper presents the results of investigations on the influence of low bottomhole temperatures in the intervals of productive formations on the technological properties of solutions used for drilling and completion of wells in order to determine the possibility of increasing gas recovery coefficient at the field of the “Sila Sibiri” gas pipeline. The analysis of technological measures determining the quality of the productive horizon drilling-in was carried out. It was found out that the dispersion of bridging agent in the composition of the hydrocarbon-based drilling mud selected from the existing methods does not have significant influence on the change in the depth of filtrate penetration into the formation in conditions of low bottomhole temperatures. The main reason for the decrease in the near-bottomhole zone permeability was found out – the increase in plastic viscosity of the dispersion medium of the hydrocarbon-based drilling mud under the influence of low bottomhole temperatures. A destructor solution for efficient wellbore cleaning from hydrocarbon-based solution components in conditions of low bottomhole temperatures was developed. The paper presents the results of laboratory investigations of hydrocarbon-based drilling mud and the developed destructor solution, as well as its pilot field tests. The mechanism of interaction between the destructor solution and the filter cake of the hydrocarbon-based drilling mud ensuring the reduction of the skin factor in the conditions of the geological and hydrodynamic structure of Botuobinsky, Khamakinsky and Talakhsky horizons of the Chayandinskoye oil and gas condensate field has been scientifically substantiated.

<!----> <!----> Research is devoted to the development of formulations detergent for drilling muds in order to reduce the adhesion of clay particles to drill pipes while deepening complex sections of the trajectory of a directional well in the intervals composed of clay rocks. Three types of glycerol-based additive composition with the addition of emulsifiers and water repellents were investigated in various concentrations in the range of 0.5 - 2%. As a result of complex studies which including measurements of the rheological parameters of drilling fluids and bench tests on the model according to the methodology presented in the report, the optimal formulation of detergent was determined. The best results were determined for the additive at a concentration of 1% for all test samples of the presented drilling fluids. The effectiveness of the detergent is estimated in the mass reduction degree of oil seal which formed on the simulator. It amounted to 65-71% in the experiments. <!----> <!---->

During the construction of directional wells in spatially curved sections of the barrel, large contact loads and huge resistance to the movement of the drill string during lifting can occur, which leads to increased wear of the drill pipes and high energy costs. One of the directions for increasing the energy efficiency of drilling such wells was the reduction of friction at the metal-metal, metal-rock, and metal-filter cake boundaries. This result can be achieved by introducing special lubricating additives or by switching to a hydrocarbon solution during drilling. The article presents the study of drilling fluids with the introduction of lubricating additives on a lubricity tester Fann EP / Lubricity Tester Model 212, a device for determining the coefficient of clay cake KTK-2, a rotary viscometer Fann 35SA, pH meter Crison GLP 21 to reduce the coefficient of friction of a pair “metal – metal” in a clay solution, which amounted to 70-75%, in an aqueous solution - up to 65%. The optimal concentration of the additive according to the study in different drilling fluids was about 1.5-2%. The results of a study of the effect of the speed and time of mixing a hydrocarbon-based solution during its preparation on the electrostability of the emulsion obtained are carried out on a BVD device, which showed a significant increase in the stability of the washing liquid to 24%, which leads to a decrease in the number of complications associated with pipe wear and a decrease torque when rotating the column.

Повышение спроса на использование промывочных жидкостей на углеводородной основе связано с постоянно растущими требованиями к качеству вскрытия продуктивных пластов. Заканчивание скважин с применением растворов на углеводородной основе наиболее целесообразно для сохранения фильтрационно-емкостных свойств продуктивного пласта, однако данные растворы достаточно дорогостоящие. Для снижения стоимости таких систем были разработаны эмульсионные растворы, которые находят все большее применение при первичном вскрытии, но для эффективного их использования необходимо обоснованно проводить выбор компонентного состава [1]. Известно, что раствор, применяемый для вскрытия пласта, должен не ухудшать естественную проницаемость продуктивных зон и обеспечивать превосходную промывку ствола. В связи с этим для удовлетворения всех поставленных задач используется базовое масло, применяемое в качестве основы для раствора на углеводородной основе. Масло оказывает непосредственное влияние на реологические и фильтрационные характеристики углеводородной системы [2]. Исследования, проведенные в работе, показали эффективность применения синтетических специализированных маловязких масел. Они открыли поле для дальнейших исследований с целью выявления закономерностей, возникающих при изменении компонентного...