| 摘要 |
FIELD: mining; transporting. ^ SUBSTANCE: invention can be implemented as stop collar for fixating pump in casing pipes, particularly in deep wells, and for prevention of random oil-well tubing twisting. Here is disclosed the mechanical anchor consisting of a case with several cylinder surfaces, off-centered relative to the axes of oil well tubing whereon the anchor is assembled; also the anchor has surfaces with insignificant decline along its axis; these surfaces are conjugated with screwed grooves for balls, races of which are located on the said surfaces; while the balls together with springs are arranged in screw slots of straps equipped with pins and situated in upper guiding bushings; springs are installed inside the bushings; also the screw slots of the straps are oriented in the direction facilitating anchor wedging with balls, when they travel around the circumference and down along the screw slots of the straps. According to the second version of the mechanical anchor design the surfaces of the balls are riffled. To wedge the balls it is sufficient to start anchor lifting. ^ EFFECT: simplification of mechanical anchor design, reduction of fabrication and operation costs of anchor, increased reliability and easing operation and maintaining mechanical anchor under field conditions. ^ 2 cl, 2 dwg |
