| 摘要 |
FIELD: oil production, particularly equipment to expand pipes installed in wells. ^ SUBSTANCE: device comprises body with central channel, coupling and nipple ends and connection threads for device connection with downhole equipment. Body wall has depressions to receive rollers supported by pins. Device also has collar rotationally installed on the body. Depressions for roller receiving are made as grooves in body wall so that major parts of roller side surfaces are enclosed with groove walls. Rollers are fixedly secured to pins retained in collar so that they may rotate. Each pin has upper part shifted forward along a circle in body rotation direction. Cylindrical roller part may cooperate with outer body surface. ^ EFFECT: simplified structure, decreased costs of device manufacturing, repair and operation. ^ 3 dwg |
