ANALYSIS OF OIL AND GAS WELL CASING DESIGNS IN ORDER TO IDENTIFY PROMISING AREAS FOR FURTHER RESEARCH

The relevance. Every year, the demand for increasing the pace of developing deposits located in complex subsurface conditions is becoming more and more urgent due to the depletion of soft hydrocarbon reserves. The construction and operation of wells in complex subsurface conditions are often accompanied by various complications and accidents, such as fluid kicks, blowouts, occurrence of intercasing pressures, leakage of the casing, thawing and collapse of permafrost in the borehole space of wells, etc. All this leads to a significant increasing of well construction costs, as well as to the increase in the costs of their maintenance and operation. When designing wells in fields with complex subsurface conditions, special attention is paid to the well casing design, due to the fact that in addition to ancillary financial costs, the wrong choice of well casing design can lead to loss of the well. An urgent issue is the choice of well casing design that allows achieving high economic performance in the absence of concomitant complications during the construction and operation of oil and gas wells in complex subsurface conditions. The main aim: identify promising areas for improving oil and gas well casing designs and well casings. Methods: evaluation and analysis of existing oil and gas well casing designs and well casings for the possibility of further optimization and applicability to the construction of wells in complex subsurface conditions. Results. The authors have developed classifications of oil and gas well casing designs and well casings. The main classification features for the oil and gas well casing designs and well casings were highlighted. Promising areas of further research were identified.