Shandong Shengli Oilfield Gudong Oil Production Plant three mining center, based on independent innovation, successfully developed a low shear cut-off ball valve, the valve has been in the industry to promote the use of. 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 delivery requirements regulating valve fully open or fully closed, otherwise it will cause a lot of polymer shear, usually a polymer injection pump Can provide polymer injection for 1 injection 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 . This problem has not been solved well since the polymer flooding technology was put into pilot test in the 1990s until its industrialization and application. The equipment manufacturers also developed the low-shear valve and failed to become a polymer flooding technology An unsolved technical problem. In March 2005, Shengli Oilfield Gudong Oil Production Plant successfully developed a three-mining center cut-off control of low-cut-off ball valve, the field injection of polymer injection pump to multiple wells at the same time as possible injection. 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 that the valve seal. Valve drive system with step-down sealing technology to ensure the flexibility of valve adjustment, to achieve the purpose of balance adjustment. In August 2005, a balanced low cut-off ball valve was tested in a gully injection station in Gudong Second Zone to realize a single polymer injection pump that can provide polymer 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 at the wellhead testing showed that adjusting the ball valve opening at full open, 2 / 3,1 / 2, 1/4, the viscosity retention rate of 98% or more, the scene has been ripe for promotion. At present, the adjustment of the valve has been declared national patent. In May 2006, Gudong three mining center in the dual complex flooding pilot design, the plan needs to increase five injection wells, and subject to pumping area constraints, it is more difficult to add a new pump. Technical staff based on the actual scene of the process, for part of the polymer injection pump idle capacity for the situation, an increase of 3 sets of balanced low cut-off regulation ball valve. Through the standby pump flow, adjust the valve opening, so that a polymer injection pump superfluous polymer mother liquor for the required well flow, to achieve a multi-pump multi-well for the polymer mother liquor, greatly improving the injection pump operating efficiency And utilization, at the same time have a better energy-saving effect. Early July 2006, the new expansion equipment has been successfully put into use on-site, to achieve normal injection together. During the process of injection and agglomeration in the southeast area of ​​the six districts, there are 3 wells whose injection liquid feed capacity is larger than the actual injection requirements. The 3 pumps have to operate at a low frequency by adjusting the frequency converter, resulting in excess capacity of the injection and injection pump. Obvious "big car", injection pump power consumption up to .9 kwh / m3. After a simple process modification, with the installation of low shear cut-off ball valve, only need to open two pumps to complete the injection of three wells mother liquor injection needs, two injection pump operating frequency from less than 30 hertz to 45 hertz , The power consumption of injection-poly is reduced to 3.4 kWh / m 3, down 0.5 kWh / m 3, saving 33 kWh per day. Electrical effect, reducing the injection pump and occupation of maintenance and repair workload. Low shear cut-off ball valve has now been in the Gudong Oilfield binary composite flooding, two districts, six southeastern southeast of more than 10 injection wells in the promotion and application. Information search shows that the balance of low cut-off ball valve in the injection test site to the scale of investment is the application of a national initiative, marking a pump on the multi-well, multi-pump multi-well injection polymerization technology is maturing, with good promotion and application prospect.