THREADED CONNECTION OF OILFIELD TUBULAR PRODUCTS Russian patent published in 2022 - IPC F16L15/04 

FIELD: oilfield goods.

SUBSTANCE: invention relates to threaded connections of oilfield tubular goods. The nipple element has a male thread section on the outer surface, which passes into the end section, which contains a sealing surface and ends with a thrust surface. The socket element has a cavity containing a female thread section, a shoulder thrust surface and a sealing surface. The sealing surface of the nipple element is formed by a convex arc with a radius R₁, and the sealing surface of the socket element is formed by a convex arc with a radius R₂, while R₂=k⋅R₁, where k=1.2÷4.0. In the assembled state of the connection, the angle α between the normal to the axis of the connection and a straight line passing through the center of the arc forming the sealing surface of the nipple element and the center of the arc forming the sealing surface of the socket element is 5÷15 degrees. Wherein the distance along the connection axis from the intersection point of the arc forming the sealing surface of the nipple element with a straight line passing through the center of this arc and making an angle equal to the angle α with the normal to the connection axis to any of the ends of this arc is at least 1 mm. The distance along the connection axis from the point of intersection of the arc forming the sealing surface of the socket element with a straight line passing through the center of this arc and making an angle equal to the angle α with the normal to the connection axis to any of the ends of this arc is at least 1 mm.

EFFECT: invention provides an increase in the length of the contact area of ​​the sealing surfaces with an increase in the uniformity of the distribution of contact pressures along its length.

9 cl, 5 dwg