BOTTOM HOLE ENGINE LUBRICATION PROTECTION SYSTEM Russian patent published in 1994 - IPC

FIELD: drilling. SUBSTANCE: lubrication protection system has body 2, that forms lubricant filled chamber 1. Its lower part has gaskets 4 and 5, over which piston 9 of lubricator 3 is mounted with protecting block, made as spring-loaded auxiliary piston 12 with gasketing member. Piston 12 is placed in piston 9, which has conjugating cylindrical and conical reducing surfaces and conical surface faces over piston cavity 10. Auxiliary piston 12 is mounted in piston of lubricator and is capable to arrange communication of lubricant filled chamber 1 with over piston cavity 10, that is connected with lubricant running cavity 8 by canal 11. EFFECT: bottom hole engine lubrication protection system is used in drilling of deep and superdeep wells for gas and oil. 4 dwg