WELL PUMPING UNIT WITH ANCHOR UNIT FOR PIPELESS OPERATION OF SMALL-DIAMETER WELLS Russian patent published in 2021 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for operation of small diameter production wells with deep-well sucker-rod pumps. Downhole pumping unit includes series-connected with production string wellhead accessories, column of hollow pump rods, flushing valve, uninserted sucker-rod pump, valve mechanism, equalizing mechanical device, safety safe disconnector of the column, coupling-plug, shank with plug, made in the form of tubing string, an upper connecting pipe hydraulically connecting the input of the uninserted pump to the valve mechanism, and the lower connecting pipe. Between the lower connecting branch pipe and the coupling-plug there installed is a hydraulic anchor, which includes a cylindrical hollow housing with an external threaded section from one end and an internal threaded section from the other end. Along the outer surface of the cylindrical hollow body there are diametrically arranged in several rows through holes so that planks installed along the outer surface of the hollow body parallel to its central axis, pass through the centers of the through holes. In through holes there installed are dies sealed with rubber rings with protective fluoroplastic washers and pressed to cylindrical hollow housing by springs retained in compressed state by planks, which are fixed to external surface of hollow cylindrical housing by detachable connection.

EFFECT: technical result consists in improvement of efficiency of fixation of deep pumping equipment at non-linear operation of vertical, inclined and horizontal wells of small diameter.

1 cl, 2 dwg