| 摘要 |
FIELD: oil and gas industry.SUBSTANCE: invention is represented by the following versions of mechanical packers: without adjustable legs, with adjustable legs located lower or higher than sealing elements and with adjustable legs both from above and below of sealing elements. An upper part of the adjustable legs of the first and second type is made as a screen and a lower part is made as the base with a groove under a spring. At front parts of the screen and base of adjustable legs of two types there are taper surfaces parallel to each other. At front parts of the screen and base of adjustable legs of the first type there are additional taper surfaces. Legs of the first type at two sides have sharp veed edges, while legs of the second type have bevels. At the coded bushing or at the packer shaft there are end-to-end X-shaped cam slots opposed diametrically. Height of a lower part of the cam slot forming the tail of identical length is less significantly than height of the upper part that represents a long left section and a short right one.EFFECT: reliable sealing of below-packer space at pressure drops.8 cl, 17 dwg |
