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.
dePendenCe of the drillinG SPeed on the friCtionAl forCeS on the CutterS of the roCk-CuttinG tool Purpose. Forecasting the deepening in one revolution and the mechanical drilling speed, taking into account the decrease in the actual axial load due to the action of the frictional force. Methodology. The analytical model of the vertical and horizontal displacements of the indenter along the surface of the rock has been improved. It is detailed with reference to drilling of boreholes with crowns of cutting type taking into account the reduced actual axial load, acting on the cutter, on rocks with physical and mechanical properties. findings. It is established that during the drilling, the true axial load is less than the nominal load due to the fric tional force arising on the front of the tool. The oneturn and the mechanical drilling speed are predicted taking into account the decrease in the actual axial load due to the action of the vertical friction force. It has been revealed that as the width of the tool is reduced, the axial load losses increase due to friction forces, and the deepening per rotation and the drilling speed decrease more intensively. originality. For the first time, the influence of the frictional force, which appears on the front of the tool of the rock cutting tool on the true axial load, the depression in one turn and the mechanical drilling speed, is shown. New ana lytical dependencies are proposed that allow one to predict the depth per one revolution and the mechanical drilling speed taking into account the design of the rock cutting tool and the geological and technical conditions of dri lling. Practical value. The developed model of the interaction of cutting allows predicting the results of the application of various designs and technologies for the development of a rocksensing tool more reliably, as well as choosing ra tional technologies for their application to achieve maximum technical and economic indicators. keywords: drilling of wells, destruction of rocks, rock cutting tool, carbide crown, perforation in one turn, mechanical drilling speed
SoMe feaTureS of DrillinG TeChnoloGY wiTh PDC BiTS Purpose. Improving the technology of drilling wells with blade bits by establishing patterns of interaction in a pair of "cutter rock" to find out the causes the "hanging" blade bits over the central part of the bottom hole and develop recommendations for eliminating. Methodology. The tasks were solved by a comprehensive research method, which includes analysis and synthesis of literature and patent sources, analytical studies of existing rotary drilling models to solve the problem of "hanging" of the blade bit. findings. It has been established that the distribution of axial load on rock cutting elements depending on the distance from the center of the blade bits is extremely uneven: the incisors located on the periphery of the bit edges experience the smallest load, and the incisors located in the central part of the bit are the most stressed. originality. It was shown for the first time that the "hanging" of the bit over the central part of the face is caused by the redis tribution of axial load along the bit blades from the minimum value at the periphery of the blades to its sharp increase to the bit axis to compensate for the decrease in the path travelled by the bit in this zone. For the first time, it was proposed to perform blade bits with sharpened blades along a radius, and to destroy the resulting core with a special device. Practical value. As a result of the research, recommendations have been developed for the design of a fundamentally new design of the blade bit, which will not "hang" over the central part of the face during the drilling process. This design of the blade bit can reduce the energy intensity of drilling.
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.
дительности алмазных буровых коронок при бурении твердых абразивных пород. Для достижения этой цели созданы многослойные коронки, в матрице которых размещены несколько алмазных импрегнированных слоев «гребешкового» профиля, представляющего круговые конусные выступы и впадины. Упомянутые импрегнированные слои по высоте чередуется с безалмазными слоями меньшей твердости и абразивности. Созданные на этом принципе казахстанские алмазные коронки под маркой КСБ прошли сравнительные испытания с коронками ведущих фирм США, Канады, Китая, России при бурении самых твердых абразивных пород. Установлено, что лучшей коронкой по критерию эффективности (отношение стоимости коронки к пробуренным ею метрам скважины) оказалась коронка КСБ. С целью дальнейшего совершенствования алмазных инструментов разработана и запатентована алмазная коронка, у которой разновысотные импрегнированные слои гребешкового профиля размещены на многозаходной винтовой поверхности. Ожидается, что такая коронка позволит при бурении использовать существующий эффект предварительного ослабления прочности породы, мощность которой в 5-10 раз превышает глубину внедрения алмазных зерен. С использованием современных методов дополнительной сортировки и классификации получена партия высокопрочных термостойких алмазных шлифпорошков с высокой их однородностью по прочности и линейным размерам. Исследовано влияние физико-механических характеристик: прочности, термостойкости, однородности по прочности шлифпорошков алмаза на износостойкость буровых коронок. Показано, что оснащение буровых коронок алмазами после их сортировки для повышения прочности, термостойкости и однородности по прочности и размерам зерен алмаза приводит к снижению интенсивности их изнашивания.
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