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This paper provides deeper insights into the performance of diamond particulate reinforced refractory composites used for cutting tools in the oil and gas industries. In particular, 25Cdiamond–70.5WC–4.5Co composites were enhanced with zirconia additives in proportions of 4 wt.% and 10 wt.% via the spark plasma sintering method. Wear tests were performed, and the analyses of elemental composition, morphology, and microstructure were completed. It was found that the addition of yttria-stabilized zirconia increased the plasticity of the matrix and thus introduced the ductile fracture mechanism, reducing the role of abrasive wear. As a result, the specific wear rate was reduced by 44% after the addition of 4 wt.% of zirconia and by 80% with 10 wt.% of ZrO2. The presence of zirconia contributed to the increase in the retention force between the matrix and diamond grits, which further reduced the intensity of the abrasive mechanism.

The article provides a detailed examination of public-private partnerships between Satbayev University and drilling tool manufacturer SK Geoservice LLP. It begins by discussing the underlying reasons for this collaboration, such as the demand for innovation and the advancement of drilling tool production. Subsequently, the article analyzes the partners’ interactions and their respective roles in enhancing the design and production processes of drilling tool manufacturing. Successful instances of the university’s research groups’ scientific endeavors being implemented by drilling tool manufacturing experts from the private sector are cited, indicating a high level of cooperation and mutual benefit. The article concludes by highlighting the partnership’s positive impact on the drilling tools market’s development, private entrepreneurship support and growth in the region, and the training of highly skilled personnel. It suggests that these outcomes create new opportunities for further cooperation and growth. Overall, the article underscores the significance of public-private partnerships in advancing science and technology and advocates for their continued deepening and expansion in Kazakhstan. It also notes that such partnerships contribute to enhancing the quality of education in drilling-related fields and bolstering the competitiveness of Kazakhstani companies in the global market.

The paper is dedicated to the enhancement of Polycrystalline Diamond Bits (PDC) designed for oil and gas industry. A novel diamond-reinforced composite was applied for cutting inserts, with the addition of 4 wt% chromium diboride to the WC-Co matrix. The addition of CrB2 ensured improvement of bending strength and fracture toughness by nearly 30% and 40%, respectively, and enhanced the diamond retention force. The efficiency of PDC bits was further improved by incorporating constructional features in both bottomhole and reaming parts. An analytical relationship between the feeding speed and geometrical parameters was found, including the wings and calibrating inserts numbers, as well as the rotational speed of the cutter. Under the conditions of rock fracture by reaming inserts, the approximate value of the required power was calculated.

The study is devoted to structure and mechanical properties of a diamond composite used for manufacturing of cutting tools applied in a wide range of technological fields. The sample tools were fabricated by cold-pressing technology followed by hot-pressing in vacuum of the 51Fe–32Cu–9Ni–8Sn matrix mixture with diamond bits, both in absence and presence of nano-VN additives. It was demonstrated that without VN addition, the diamond–matrix interface contained voids and discontinuities. Nanodispersed VN added to the matrix resulted in the formation of a more fine-grained structure consisting of solid solutions composed of iron, copper, nickel, vanadium and tin in different ratios and the formation of a tight diamond–matrix zone with no visible voids, discontinuities and other defects. Optimal concentrations of VN in the CDM matrix were found achieving the maximum values of nanohardness H = 7.8 GPa, elastic modulus E = 213 GPa, resistance to elastic deformation expressed by ratio H/E = 0.0366, plastic deformation resistance H3/E2 = 10.46 MPa, ultimate flexural strength Rbm = 1110 MPa, and compressive strength Rcm = 1410 MPa. As-prepared Fe–Cu–Ni–Sn–VN composites with enhanced physical and mechanical properties are suitable for cutting tools of increased durability and improved performance.

The work is devoted to the calculation of the main technological parameters of a bit of a new patented design, the essence of which is to replace worn out working elements (carbide cutters or diamond-containing matrices) during drilling with a new, not blunt tool right at the bottom of the well. The need to correct the calculation method is associated with the design feature of the new crown, which consists in the fact that when using it, an annular bottom of a larger width is formed compared to serial crowns of the same outer diameter. Therefore, the known formulas for carbide and diamond drilling have been supplemented with appropriate correction values so that the ROPs when using new and serial bits are the same during full development. So, when using carbide cutters as rock-cutting elements, a correction factor is introduced that increases the number of main cutters in the crown sectors of the first and second stages. In diamond cutting, it is necessary to increase the maximum speed of the tool, taking into account the mining technical conditions of penetration. Refined formulas for calculating the parameters of the drilling mode allow preserving the advantages of bits with extendable working elements and increasing the drilling speed by 1.7-1.8 times compared to existing serial bits.

Loss of drilling fluid in wells is one of the most important drilling challenges. To prevent this problem an insulation of borehole wall is requiring. The results of study of an innovative technology of isolation of borehole using a new thermomechanical plugging material are presented herein. The material considered is solid composite consisting secondary polyethylene terephthalate and gravel. Theoretically and experimentally shown the possibility to use this material to borehole isolation. The technology of manufacturing and isolation of absorbing horizons by thermomechanical material has been developed. Dependence of the regime parameters of thethermomechanical process melting of material on the thermophysical properties and technical characteristics was established. Dependence of the penetrating ability of material melt on the fractures was established. The results of work can be used to recommend technology parameters providing the efficient melting rate.

Easily dispersible clay layers are meet in some oil and gas fields of Kazakhstan. Such clays of near wellbore zone swell and cause tight hole and cavingsunder the influenceof watermud filtrate while drilling. These problemsresultconsiderable lossof time and increase ofdrilling operations costs. An effective method to prevent clay swelling is the use of drilling fluids. Their structure, among other components, includesinhibitors,which reducenear wellbore zoneclaydispersibility, andstabilizers, that preventcoagulationof thedrilling fluidunder the action of the inhibitor carried by those drilling fluids. Aim of the work - to find optimal drilling fluid composition for drilling conditions in Kazakhstani oil and gas fields, according to criteria of effective prevention of clay swelling at minimum costs. The paper contains results of laboratory and industrial research in quantitative and qualitative effects of reagents on the operating parameters of the drilling fluids. The methods, which can reduce drilling fluid costs significantly by using less expensive reagents, have also found theirjustificationin this article. Thus,a significantstep forward was done in solvingthe problem ofdrillingshalerocks.

This research explores the application of gravel filters in oil wells to mitigate sand production. The study focuses on a novel approach utilizing a bitumen-based binder to create a durable and efficient gravel pack. A comprehensive review of traditional gravel filter designs and their limitations is presented. Experimental results demonstrate the improved strength and stability of the bitumen-bound gravel pack, as well as its controlled dissolution rate in hydrocarbon environments. This innovative solution offers several advantages, including enhanced well productivity, reduced maintenance costs, and improved environmental performance. The paper concludes by discussing the potential applications and future research directions for bitumen-bound gravel filters in the oil and gas industry. The recommended gravel filter design, utilizing a gravel-bitumen mixture, is proposed to enhance efficiency and reliability in oil and gas well operations.

The optimization of technological processes 1s vital for advancing scientific and technical progress in exploration activities, particularly in drilling operations. The integration of operating microprocessor equipment and automated management systems has opened up new opportunities for theoretical research in optimization processes and drillings. Control systems for drilling exploration wells on solid minerals enable realtime operation and data collection, processing, and diagnosis of equipment functionality. Optimization of technological processes using modern equipment aims to enhance production efficiency, improve quality, and reduce costs. Despite advancements in equipment, tools, and drilling technology, there are still significant opportunities for increasing productivity and improving technical and economic indicators in prospecting drilling. Optimization criteria vary depending on the objectives, with the maximum productivity often achieved by minimizing drilling time. The task of finding the maximum drilling speed per run involves optimizing parameters such as weight on bit, tool speed, and mud flow rate. A novel technique proposed in this study involves cyclic intra-run changes in speed per minute as the optimization criterion, rather than mechanical speed. The developed method is applicable to any rock cutting instrument and drilling method, with the optimization of drilling speed per run as a function of drilling time. The use of time and speed coefficients simplifies calculations and reveals regularities in the drilling process, contributing to the optimization of drilling operations.

Features of colmatation zones of a productive formation in terms of rotary drilling by drilling muds are considered. A brief analysis of the most popular decolmatation methods is performed. Special attention is paid to the decolmatation method involving implosion effect. An example of one of the existing installations is represented with following consideration of its application features. A new principally different installation, free from the disadvantages found in the available one, is considered; a patent for the installation is obtained in Kazakhstan. It does not involve tubing with its packer and wellhead sealing. It also does not require a compressor and its manifold. Characteristic features of the newly developed installation for creating implosion effect are represented; its operation at producing both single and any number of repeated implosion acts is examined. A mathematical analysis is performed to calculate the empty space limits required for the implosion effect by a criterion to prevent casing string collapse by hydrostatic pressure of the drilling mud remained in the annular space. An example of dependency of the maximum permitted length of empty space in the casing string on its mechanical strength and its wall thickness, calculated by means of a computer program, is represented.