Polymers are often used in the development of heavy oil in the field. Due to the polymer solution is a non-Newtonian liquid, due to the loss of mechanical shear viscosity, the polymer medium transport requirements regulating valve fully open or fully closed, otherwise it will cause a lot of polymer shear, usually a polymer injection pump Can only give a well injection together. That is, a polymer injection pump can only provide polymer for one well. If the injection pump displacement is greater than the amount of polymer injection required polymer injection wells, then the mother liquor over-injection of the case; if you hit the return flow, resulting in a substantial polymer shear, while causing ball valve leakage due to wear and tear . Since the pioneer test of polymer flooding technology in the 1990s, until the industrialization and application, the problem has not been solved well. The equipment manufacturers also developed the low shear valve and failed to become a polymer flooding technology An unsolved technical problem. With the successful development of the balanced low-cut-off control valve, a multi-well injection pump is provided for multiple wells at the same time for multiple injection pumps. The valve spool conical design, the fluid passage is arc-shaped, the valve core and the seat seal at the use of surfacing alloy material, has a strong erosion resistance, to ensure the sealing of the valve. 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 at Gudong injection station in Gudong II to achieve a single injection pump that can provide mother liquor to two 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. On-site operation, through the standby pump flow, adjust the valve opening, so that a polymer injection pump excess polymer mother liquor for the required well flow, to achieve a multi-pump multi-well for the polymer mother liquor, increased injection pump Operating efficiency and utilization. Data show that the balance of low cut-off valve in the injection field test to test the size of the application, marking a multi-well pump, multi-pump multi-well injection process is becoming more mature, with good prospects for promotion. workout equipment,workout equipment for gym,workout equipment names,workout equipment all in one Foshan Laijian Fitness Equipment Co., Ltd. , https://www.gymljfitness.com