In the process of oil recovery, due to polymer shear loss by the mechanical shear viscosity, the polymer medium requires the regulation of the ball valve fully open or closed, otherwise it will cause a lot of polymer shear, usually a single injection pump can only give A well injection together. Gudong Oilfield Gudong Oil Production Plant Center technicians developed a balanced low-cut-off valve, the injection of the same time, the injection pump to multiple wells injection possible. Cut-off valve with low cone cut-off conical design, the fluid passage for the arc, the valve seat and the seal at the use of surfacing alloy material, with strong erosion resistance to ensure the valve seal. Valve drive system with step-down sealing technology to ensure the flexibility of the valve adjustment to achieve the purpose of balance adjustment. In August 2005, a balanced low-cut-off control valve was tested in a gully injection station in Gudong II, realizing that a single injection pump can provide mother liquor to both wells at the same time. After more than six months of testing, the valve proved that the mother liquor has high regulation accuracy, easy operation on site and high viscosity retention rate. Site sampling test showed that the valve opening in full, 2 / 3,1 / 2, 1/4, the viscosity retention rate of 98% or more. At present, the control valve has declared the national patent.
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