WELLHEAD (VERSIONS) Russian patent published in 2019 - IPC E21B33/03 

FIELD: water supply.

SUBSTANCE: invention relates to water supply, in particular, to wellhead tying equipment and can be used in agriculture, housing and communal services and other fields. Borehole head is made from resilient dense material in the form of a solid of revolution and has through holes. According to the first version, the head rotation body according to the first version is tapering in one direction and has two flat bases; the surface of the rotation body is located outside the geometrical truncated cone, the bases of which are bases of the body of revolution. According to the second version, the head rotation body according to the second version is tapered in one direction, and has one flat base, the surface of the rotation body is located outside the geometric cone, the base of which is the base of the body of revolution, and the vertex of which lies on the surface of the rotation body. Rotation body of the headstock according to the third version consists of two parts. First part of body of revolution is tapering, and second part of body of rotation is located on wider side of convergent part.

EFFECT: invention allows increasing allowable weight of borehole equipment attached to the head; in addition, some particular cases of making the head provide the possibility of inclination of axis of symmetry of the head relative to the vertical, which in a number of cases allows simplifying installation of external equipment of the well.

49 cl, 11 dwg