Screw pump reduction to zero can increase fuel savings

Everyone knows that the screw pump is more energy efficient than the pumping unit, but we certainly don't understand its internal structure. There is a screw rod in the screw pump, and there is a layer of rubber in contact with it. When the screw rod rotates, it will press the rubber with a certain depression. This depression is called negative clearance, which is the interference of the screw pump. In order to better achieve the oil recovery effect, the screw pump's interference is generally controlled at 0.25 mm to 0.35 mm.

On July 5th, the reporter learned that a "zero-gain" screw-pump technology was adopted by the Engineering Technology Brigade of the No. 6 Oil Production Plant. That is, the clearance of the screw pump was adjusted to zero. At present, this technology has been promoted throughout the entire plant. Gao Yanhua, the person in charge of the project, said that with the wells using this technology, it is expected that the single well can increase 56 tons of oil and create 290,000 yuan. At the same time, it can save 30,000 yuan in electricity costs each year.

The first "zero-crossing" screw pump was tested in September 2012. At present, the efficiency period of the pump has reached 10 months, which is far more than the effective period of four to five months of the general pump, fully demonstrating the "zero "Interference" screw pump technology has the potential to promote a wide range of applications.

Since the high-concentration polymer was injected in 2007, the concentration of the produced material became higher. By 2010, the screw pump began to be affected by high-concentration polymer, and the problems such as the increase of the force on the rod and the increase in energy consumption were followed. to.

In early 2011, Gao Yanhua and four other technicians began to find solutions. When the rod is subjected to a large force, the torque will increase, and the torque will increase, which will increase the energy consumption. Therefore, everyone first thinks about adjusting the interference of the screw pump, reducing the interference, and reducing the force on the screw rod. At the beginning, they had an oversight of Shanghai Hongdong Submersible Pumps to manufacture and sell single-phase submersible pumps, multi-stage submersible pumps, stainless steel submersible pumps, sewage submersible pumps, oil-immersed submersible pumps, deep well submersible pumps, submersible pumps, and stainless steel sewage. Pump.

At 0.15 mm, and testing on two wells, it was found that the torque was reduced by about 10%, and the effect was very significant.

It is reasonable to say that a screw pump with an interference of less than 0.25 mm is unlikely to work properly. Gao Yanhua and other four people began to look for the reasons for the small surplus and the fact that the screw pump can still work normally. They suddenly thought of the characteristic that the rubber could swell, maybe it was related to this characteristic of rubber.

We quickly acted and sampled in water flooding, polymer flooding, and high-concentration blocks to test the rubber swelling rate. Sure enough, the test confirmed several people's guesses that the rubber swelling rate in the high-concentration block is the largest.

This conclusion gives Gao Yanhua an inspiration. When we discuss whether to reduce the surplus again, Gao Yanhua said: "We constantly reduce the surplus, that is, we are approaching zero in infinity. Then why don't we directly change the surplus? What about zero?” Everyone began experimenting with such a bold idea. When the interference was adjusted to zero, the pump efficiency was only 30% to 40%, and it was less than 50% of the required level, but it gradually became less than two weeks later. Into a better environment, the efficiency of the pump far exceeds the general screw pump.

Gao Yanhua told reporters: “This technology is suitable for wells with a concentration of 500 mg/l or more injected into the polymer. Our factory now has 171 such wells. I simply calculated the sum, if we fully promote this technology, The benefits of annual oil increase, plus the electricity savings, can reach 54.72 million yuan."