MATHEMATICAL EQUATIONS FOR TEMPERATURE CONTROL IN THE CONTACT SURFACES OF DRILLING AND MAINTENANCE EQUIPMENT

The maintenance of equipment and tools used in the workover of oil and gas wells depends on keeping them in working condition, reliability, strength and temperature endurance of the tool. In order to restore wells in case of an accident and bring them back into operation, it is necessary to speed up the drilling and repair work by choosing the right repair equipment and following the existing rules and regulatory documents. The cutting elements of the tools working under high pressure and loads are deformed, a tense situation is created in the cutting – destruction zone, high temperatures (10000 - 12000) occur as a result of corrosion in the triboknots. The stress-deformation state in the cutting-destruction zone causes the formation of microcracks in the working area of the tool. Microcracks grow after a certain period of time. Cutting elements are quickly worn, in some cases broken and fail quickly. Such cases affect the structural composition of the cutting elements, the temperatures increase, as a result, riveting occurs. In order to keep the equipment and tools used in the repair in normal working condition, adjusting the mode parameters is one of the important requirements, in addition to taking special care of them. The high results obtained in repair and restoration works depend on the efficiency of the cutting-destructive tool, longevity, material selection, construction manufacturing technologies, tool that meet modern requirements, dimensions, weight and internal condition of the well being restored. It is necessary to keep the heat generated in the moving parts of the tool at the required level for the safe performance of restoration works. The thermal regime of cutting and rock-destroying tools depends on the physical-mechanical properties of the objects subjected to destruction and the effect of thermomechanical stresses generated on the contact surfaces of the tool and the amount of heat released from the working surface. Studying the problems related to heat issues will allow to ensure the temperature tolerance of not only the repair equipment, but also the equipment and tools used in other areas of the oil-field industry. Keywords: temperature, cutting and destructive tool, metal, rock.