Study of gas and liquid separation in a closed drilling well with self-propelled drilling rigs

The article deals with the gas release in the process of drilling wells from jack-up drilling rigs. The article attempts to analyze the nature of the change in pressure at the blowout of the preventer after its closure due to gas releases on jack-up drilling rigs. Numerous observations in drilling rigs have shown that the pressure value increases rapidly to a maximum, then gradually decreases and stabilizes at a certain value. There are cases when the value of pressure increases rapidly. Then, without decreasing, it stabilizes. It is proposed that the phenomenon of gas segregation in a well, leading to an increase in pressure, has theoretical and practical significance. In addition, in a real well, a change in bottom hole pressure can occur under various conditions, if the rate of pressure growth due to gas segregation in the riser pipes is greater than the pressure rate due to the work of the formation, while part of the fluid from the well must be squeezed out into the formation. Keywords: well drilling; gas release; complications; open fountain; drilling fluid; preventer; gas segregation; oil and gas.