METHOD OF PUSHING AND PULLING INNER CORE PIPE DURING CORE SAMPLING Russian patent published in 2020 - IPC E21B25/02 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to method of coring at drilling at different angles with application of prestressed twisted multi-strand steel wire. Proposed method comprises the following steps. Drilling rig is fixed at drilling site of exploratory wells, after verification of observance of safety rules, equipment is started, first internal core pipe is installed and well is drilled. After filling the first inner core pipe with core by means of rolling pressure rollers, pre-stressed twisted multicore steel wire is used, which is introduced into the front part of the drill pipe, inner core tube is gripped, first inner core pipe is pulled without removing drill pipe, after which first inner core pipe is released. Then, the second inner core tube is placed inside the drill pipe, by means of the rolling pressure rollers, the pre-stressed twisted stranded steel wire pusher is actuated to push the second inner core tube, it is pushed into the front end of the drill pipe, then, pre-stressed twisted multicore steel wire is removed, which is wound on winding apparatus, drill pipe is built up, power head is started and drilling is continued; at that, second inner core pipe remains empty before drilling. During drilling with drilling rig using second inner core pipe core is withdrawn from first inner core pipe; when drilling with a drilling rig using the first inner core pipe, core is taken out of the second inner core pipe. Said steps are repeated until reaching the determined depth of exploration well.

EFFECT: technical result consists in improvement of efficiency and productivity of work on drilling of exploration wells, providing high-quality core and reducing labour intensity.

1 cl, 2 dwg