| 摘要 |
FIELD: oil industry. ^ SUBSTANCE: oil-well sucker-rod pump comprises magnetic system made of axially magnetized pairs of ring magnets provided with magnetically soft spacers between them to define magnetic circuits. The directions of magnetization of the magnets are opposite. The magnetic system is mounted on the couplings made of a nonmagnetic material and in the cylinder made of a nonmagnetic material. The cylinder defines the outer surface of the plunger. ^ EFFECT: enhanced efficiency and reliability. ^ 2 dwg |
