Sucker dynamic seal ring seal device to fill the gaps

Recently, the victory of oil mining machine developed by the School of the design of a dynamic seal ring seal rod is successfully obtained national patents. Reportedly, the dynamic seal ring seal can be achieved when the job well with pressure 19-70 mm diameter rod string from under the plastic seal, to fill a gap.
For quick turn after fracturing in the oil field and oil well pumping operations, such as the implementation process with pressure, because no rod tube wellhead annulus seal control device, causing the pump and the pressure at the wellhead poles circumstances not directly from the case victory developed oilfield hospital can achieve different diameter poles dynamic and static sealing rod dynamic seal ring closure device.
Reportedly, the dynamic sealing device from the shell, spherical plastic core, pistons, piston gland, the gland and other components, the use of spherical plastic core piston compression deformation hold poles, hydraulic powered, and by controlling the hydraulic pressure to the size of achieve different diameter poles Security seals and dynamic sealing capacity of 3 MPa, static sealing capacity of 7 MPa.