FIELD: oil industry, particularly devices to operate wells complicated with powder material precipitations on well face and in bottomhole formation zone.
SUBSTANCE: device comprises serially arranged flow string, discharge valve, accumulation container and cylinder with piston, as well as check valve and liner. The device also has pushing tube having upper part located in the cylinder so that the tube may cooperate with the piston, and lower part connected to the liner. Accumulation vessel is connected with the cylinder. In initial state the piston is fixed in the cylinder by means of fastening members, which may be sheared under the action of flow string. Pusher tube travel limiter is installed in the cylinder.
EFFECT: increased efficiency of precipitation removal.
2 cl, 1 dwg
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