STATOR OF SCREW GYRATORY HYDRAULIC MACHINE Russian patent published in 2018 - IPC E21B4/02 F04C2/107 F01C1/107 

FIELD: drilling soil or rock.

SUBSTANCE: invention relates to hydraulic drives for rotary drilling located in a well. Stator comprises a tubular body with an inner surface made in the form of a helicoid with internal helical teeth, an internal thread is formed at each edge of the tubular body, and also contains an elastomeric plate attached to the tubular body adjacent to the inner surface of the tubular body, the elastomer cover is made with internal helical teeth and coincides in shape with the internal helical teeth in the tubular body, and the thickness of the lining is maximum on the teeth, radially directed inwards. In the tubular body, the maximum thickness of the elastomer liner 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 tubular body along the radially outwardly directed depressions of its internal helical surface is equal to the height of the inner helical teeth in the elastomer plate. In the upstream portion of the tubular body, the stator comprises a damper cavity located downstream of the edge of the internal helical teeth in the tubular body, directed in the form of an annular groove inside the tubular body adjacent to the lateral surfaces of the inner helical teeth of the tubular body formed by said annular groove, and the elastomer cover comprises, in said damper cavity, an elastomeric inlet damper with its own internal helical teeth, an elastomer-coated liner adjacent to the internal helical teeth, the annular groove adjacent to the surface of the annular groove within the tubular body and the lateral surfaces of the inner helical teeth of the tubular body formed by said annular groove is adapted to be fastened to an elastomeric plate, and also with an annular groove within the tubular body and lateral surfaces of the inner helical teeth of the tubular body formed by said annular groove, besides the minimum distance from the upstream edge of the inner helical teeth in the upstream portion of the tubular body to the input edge of the input damper is equal to the thickness of the input damper made of the elastomer on its internal helical teeth, radially directed inwards, while downstream of the edge of the internal helical teeth in the outer stream portion of the tubular body the elastomer cover comprises an elastomer output damper with its own internal helical teeth, adjacent to the internal helical teeth of the elastomer, adjacent to the inner surface of the downstream part of the tubular housing with the possibility of bonding to the elastomer lining and the inner surface of the downstream part of the tubular housing, besides the minimum thickness of the input and output dampers from the elastomer along the troughs of their internal helical teeth located at the maximum radial distance is equal to the thickness of the elastomer plate on its radially inwardly-directed teeth.

EFFECT: increase of reliability and resource, accuracy of penetration of inclined and horizontal wells, rate of a set of curvature parameters of wells, and also improves cross-country ability, id est the resistances and the stresses in the bottom-hole assembly are reduced.

1 cl, 9 dwg