DEVICE FOR PULSE-DEPRESSION ACTION ON BOTTOMHOLE FORMATION ZONE Russian patent published in 2014 - IPC E21B28/00 E21B43/25 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-and-gas industry, in particular to devices intended for affecting the bottomhole formation zone by a depression pulse to up the well efficiency operated by sucker-rod downhole-pumping plants. The proposed device pulse-depression action on bottomhole formation zone comprises a hollow case with a guide and intake holes and a depression chamber extending therein. A cover is telescopically arranged at the said hollow case and locked by a shear screw. Note here that a variable-section rod is fitted concentrically in the said hollow case to connect the said depression chamber with an extra depression chamber. The said variable-section rod interacts with an overflow hole of the hollow case while a packer and wedge are arranged on the cover cylindrical surface. The wedge outer conical surface interacts with radially displacing slips. The cover is provided with a stop to interact with the wedge. The said hollow case rests of the well bottom. The cover cylindrical surface is provided with a radially displacing thrust ring and extra slips arranged under the slips and an extra wedge rigidly connected to the hollow case guide. The variable section rod bottom section has lateral holes and is provided with a plug at its bottom end section. The variable section hollow rod houses a plunger with a suction valve. The said plunger is connected via the rod string with the pumping unit. In an initial position, the hollow case overflow hole interacts with the hollow rod and isolates the hollow case intake holes from the hollow rod side holes. In the working position, the hollow case overflow hole gets out from the interaction with the hollow rod and communicates the hollow case intake holes with the variable section hollow rod side holes.

EFFECT: efficient cleaning of the bottomhole formation zone without multiple round trips.

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