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 wells. 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. Elastomer cover comprises, in the upstream portion of the tubular body, upstream of the edge of the internal helical teeth facing the flow, input damper of elastomer with its own internal helical teeth, adjacent to the internal helical teeth of the elastomer, the surface of the tubular body, which is adjacent to the inner surface of the upstream portion, is capable of being fastened to an elastomeric plate, the lateral surfaces of the inner helical teeth of the tubular body facing against the flow, and the inner surface of the upstream portion of the tubular body. Downstream of the edge of the internal helical teeth of the tubular body in the downstream 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, located in the tubular body, that adjoined to the inner surface of the downstream portion of the tubular body with the possibility of bonding to the elastomeric plate, the lateral surfaces of the inner helical teeth of the tubular body being directed downstream and the inner surface of the downstream portion of the tubular body. Minimum thickness of the input and output dampers from the elastomer along the valleys of their internal helical teeth located at the maximum radial distance is equal to the thickness of the elastomer plate on its teeth radially inward.

EFFECT: reliability and resource are increasing, accuracy of penetration of inclined and horizontal wells, rate of set of curvature parameters of wells, as well as cross-country ability, that is resistances and stresses in the bottom-hole assembly are reduced.

1 cl, 8 dwg