STATOR OF SCREW GEROTOR HYDRAULIC MACHINE Russian patent published in 2019 - IPC E21B4/02 F04C2/107 F01C1/107 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to hydraulic drives for rotary drilling located in a well. Stator comprises a tubular housing with an inner surface made in the form of a helicoid with internal helical teeth, on each edge of the housing there is an internal thread, and also comprises an elastomer cover in housing adjacent to housing inner surface, elastomer cover is made with inner helical teeth and matches shape with internal helical teeth in the housing, and the thickness of the coating is maximum on teeth radially directed inwards. In the tubular housing, the maximum thickness of the elastomer cover along the valleys of its inner helical surface located at the maximum radial distance is half the height of its internal helical teeth, and the minimum wall thickness of the housing along the radially outwardly directed recesses of its inner helical surface is equal to the height of the inner helical teeth in the elastomer cover. In stator in downstream part of housing there is a damper cavity located downstream of internal screw teeth edge in housing directed against flow, made in form of annular groove inside housing, which adjoins to side surfaces of internal helical teeth of housing, formed by said annular groove, and the elastomer cover contains in the damper cavity an inlet damper from an elastomer with its own internal helical teeth adjoining the inner helical teeth of the elastomer cover adjacent to the surface of the annular groove inside the housing and the side surfaces of the inner helical teeth of the housing, formed by said annular groove, with possibility bonding to an elastomer coating, as well as with annular groove inside housing and side surfaces of internal helical teeth of housing, formed by said annular groove, wherein the minimum distance from the anti-flow edge of the inner helical teeth in the inlet downstream of the housing portion to the input edge of the input damper is equal to the thickness of the input damper from the elastomer on its inner helical teeth radially directed inward. Stator comprises in the downstream part of the tubular housing a damping cavity located upstream of the edge of internal helical teeth in the housing, directed downstream, made in the form of an annular groove inside the housing, adjacent to the side surfaces of the internal helical teeth of the housing, formed by said annular groove, and elastomer cover comprises in said damper cavity output damper from elastomer with its own internal helical teeth, adjacent to inner helical teeth of elastomer cover, adjacent to surface of annular groove inside housing and side surfaces of internal helical teeth of housing, formed by said annular groove, with possibility bonding to an elastomer cover, as well as with annular groove inside housing and side surfaces of internal helical teeth of housing, formed by said annular groove, wherein the minimum distance from the upstream edge of the inner helical teeth in the downstream portion of the housing to the output edge of the output damper is equal to the thickness of the output damper from the elastomer on its inner helical teeth radially directed inward.

EFFECT: increased resource and reliability, accuracy of driving of inclined and horizontal wells, rate of set of parameters of well curvature, as well as improved cross-country capacity, that is reduced resistance and stress in assembly of bottom of drill string.

1 cl, 10 dwg