Explosive packer

EXPLOSIVE PACKER (EN: blast packer; DE: Sprengpackung, Sprengstoffpaket; FR: packer de tir; ES: obturador de tiro; RU: взрывной пакер) is the device for the closing and separation of the individual layers (petroleum, gas, and others) within the cased drilled boreholes, which is acting on the account of the energy of the explosion of the gunpowder charge. The explosive packer creates within the shaft the hermetical bung, which is withstanding the difference of the pressures of up to 30 megapascals. The most widespread explosive packer is the hollow cylinder, which is made of the aluminium alloys, which, during the activation of the gunpowder charge, is deformed, and is pressed into the casing pipe. During the selection of the charge, they use the nomograms, which are taking into account the internal diameter of the casing string, and the hydrostatic pressure. They distinguish the following explosive packers: of the ring type, the casing of which is pressed into the casing string; of the slip type, when the attachment to the casing string is performed with the help of the slips; of the umbrella type, which are unfolding after the descent into the borehole, and are sealed using the cement from the bailer. They use the ring-shaped explosive packers for the insulation of the intermediate water-flooded layer, while keeping the lower horizon in operation. They use the explosive packers of the slip type for the works at the great depths, under the conditions of the increased pressures (up to 150 megapascals) and temperature (up to 200 degrees Celsius).