FIELD: well drilling.
SUBSTANCE: device is claimed for draining liquid when lifting a pipe string from a well. The device includes a body with a funnel in the form of a branch connected to the side pipe of the casing string. The funnel is made in the form of an inverted truncated cone. The base of the cone is provided with an oblique cut directed towards the casing string. The body is in communication with the discharge line of the pump. The body is equipped with a fine filter, tightly inserted around the perimeter, by means of a seal. The funnel is additionally equipped with a coarse filter inserted hermetically around the perimeter by means of a seal. The coarse filter is made with the ability to retain 50-70% of mechanical impurities from the liquid, while the fine filter can retain 75-90%.
EFFECT: creating a device for draining liquid when lifting a pipe string from a well, which makes it possible to exclude the discharge of mechanical particles into the well from the liquid flowing from the pipe string being lifted, due to the installation of appropriate filters inside the body and funnel.
2 cl, 1 dwg
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