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

FIELD: drilling. SUBSTANCE: lubrication protection system has body, that forms lubricant filled chamber 1. Its lower part has gaskets and mounted over them piston type lubricator with gaskets 9. Lubricator over piston cavity 10 communicates with lubricant running through cavity 13 by canal 14. Lubricator piston 7 has radial hole 8, located between gaskets 9. Upper part of inner surface of lubricator cylinder 6 has recess. Piston 7 is spring-loaded by spring 11 and/or has no-return valve, made as elastic bush 15, mounted so as to be capable to overlap hole 8. During piston 7 movements under action of lubricant exceeding pressure its extreme gasket 9 goes out of reducing surface of cylinder 6. Lubricant pressure overcomes resistance of elastic bush 15 and communication of cavity 10 and chamber 1 cavity takes place. Lubricant pressure in cavities is equalized. Elastic bush 15 due to its elasticity force reliably overlaps hole 8. As pressure on both sides of piston 7 is equalized, then it under action of spring 11 is moved into space of reducing surface of cylinder 6. EFFECT: bottom hole engine lubrication protection system simplifies and make easy operational usage of engine. 3 dwg