BALANCE-BEAM DRIVE FOR A SUCKER-ROD PUMPING UNIT

摘要

The invention is related to the field of the petroleum-producing industry, in particular, to means for liquid medium pumping from process wells. Reduction of time expenditures for transportation and maintenance, convenience of maintenance, the possibility of smooth adjustment of the mast height, improvement of reliability and increase in service life of the wire-line string-up rope are achieved by provision of a balance-beam drive for a sucker-rod pumping unit comprising a base, a power drive with a counterweight and a crank-and-rod mechanism provided with a balance beam; a mast deflectable from the well mouth by a position regulator in the form of a pipe with ties having threads of opposite directions at its ends, the mast being provided with a crown block frame at its top end; at least two-line string-up of overturned design provided with an additional roller for suspension of the polished rod of the string of rods and with a drum with a reserve of a flexible element, wherein the drive includes two tackle systems arranged in parallel and equipped with a single flexible element embracing said additional roller to which the polished rod is suspended. In a particular case of the embodiment, both ends of the flexible element are wound with a reserve and fixed in individual drives, which makes it possible, if necessary, to let pass the flexible element of the wire-line string-up as some of its portions become worn-out, in order to improve reliability and to extend service life. The paired tackle system consisting of one single-piece rope and suspension of the polished rod by means of a pulley ensure uniformity of tensions and of effective loads in each branch of parallel tackle systems, their high reliability, easy installation and operation.