| 摘要 |
FIELD: mining.SUBSTANCE: group of inventions relates to equipment and operations in underground wells, namely, to piston pulling systems, methods of functioning of the piston pulling systems and methods of moving a pipe string in a well shaft. Piston pulling system comprises the first group of the first and second piston units, which are made with a possibility of tight contact with the well shaft, and a pump made with a possibility to displace the first flowing medium between the first circular space, isolated between the first and second piston assemblies, and the second circular space. Method of operating of piston pulling system consists in bringing into a tight contact with the well shaft of the first group of the first and second piston assemblies, engagement of the second piston assembly with the well shaft and pumping of the first flowing medium from the first circular space formed between the first and second piston assemblies, while the first piston assembly is attached to the pipe string, providing for a possibility of movement of the pipe string through the second piston assembly. Method for moving a pipe string in a well shaft includes bringing into a tight contact of the first and second piston units with the well shaft, wherein each of the first and second piston assemblies comprises the first gripping device which is selectively coupled with the well shaft, and the second piston assembly comprises the second gripping device which is selectively coupled with the pipe string.EFFECT: technical result consists in ensuring of movement of a pipe string into a well shaft.76 cl, 9 dwg |
