The mathematical modeling of the mechanism of gas migration in the annulus oil and gas wells
Everywhere on the gas and oil fields of the Volga-Ural, the Caspian and West Siberian oil and gas province, after entering into commercial development wells identified intercolumned pressure (MCD) and flows (INC) more than 50 % of wells. Found that gas flows in cemented casing and cement migrates up the ring from the reservoir into permeable interlayers upper section of the well to form a man-made gas accumulations. Upon reaching the mouth of the gas on the cement ring observed intercolumned gas show, flows and springs at the wellhead. Problems between strings pressures and flows in the production wells may violate the integrity of the cement stone, well integrity violation and as a consequence - the conclusion of a well operating fund.