UNDERGROUND EQUIPMENT WITH DEVICE FOR CLEANING OF SETTLING WELL OF METHANE-COAL HOLE DURING ITS DEVELOPMENT AND MAINTENANCE Russian patent published in 2010 - IPC E21B37/00 E21B43/00 F04B47/00 

FIELD: mining.

SUBSTANCE: underground equipment includes assembly of borehole pump descended into hole using production tubing. Steady bush is located in production string below holing zone. Mechanism of compensation of axial displacement of assembly of borehole pump is connected to sludge trap by its lower end, and by upper end - to mentioned assembly through tail filter. Sludge trap in the form of hollow casing with bottom, open from above, is installed airtight on steady bush by its upper part. Underground equipment is located in production string below holing zone after descending into hole and airtight installation of sludge trap by its upper part on steady bush.

EFFECT: speeding and simplification of process of installation and removal of sludge trap due to exclusion of jobs related to round trip of fishing tool, possibility of creation of more considerable pressure drawdown on productive stratum, that is especially important for methane-coal holes during their development and maintenance.

6 cl, 3 dwg