MACHINE FOR WELL DRILLING Russian patent published in 2008 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: invention refers to well engine of gerotor type and can be used for oil, gas and exploratory well drilling. The machine consists of a hollow housing, an internal gerotor mechanism including coaxially placed stator and an off-centre rotor installed therein. Additionally, the internal surface of the stator contains an elastic membrane and is installed in such a way that between the internal wall of the hollow housing and the external surface of the stator, a circular pocket is formed. The hollow housing is fitted with a valve to create vacuum inside the circular pocket.

EFFECT: prolonged operational life of engine and improved technical and economic characteristics of well drilling within the ranges of high bottom-hole temperatures.

2 cl, 1 dwg