One of the major production costs of rod pumping is the cost of getting down and repairing sucker rods, pumps and tubing. Many wells are inefficient due to over-frequency detection of the pump, especially during shutdown. Recently, US researchers developed a low-sluicing pump to solve the above problems, making inefficient wells a long-term profit well. The minimum speed The longest stroke pumping faster, the more its reciprocating frequency, the sucker rod to reach the fatigue limit faster. If the pumping unit draws oil at the minimum speed and the longest stroke, the pumping reciprocation and stress due to the movement will be minimized to match the pump and reservoir fluid rates. The longer sucker rod life is closely related to low stroke and stable pump stroke. If the pump is able to lift more fluid than the reservoir can provide, pump speed can be reduced to match the amount of fluid to the reservoir volume. The necessary deceleration is usually achieved by replacing the pumping unit or the motor pulley, or both. Low-stroke pumping can also be installed in the pumping unit between the motor and gearbox as the middle of the shaft reducer to complete. The middle moving shaft is a shaft mounted on two bearings with input and output (driven) pulleys. The input pulley is driven by the pulley of the motor equipped with the power transmission belt and the output pulley is driven by the pulley of the pumping unit gear box. In general, the cost of installing an intermediate moving shaft is less than the cost of lifting the tubing. Tests show that the gearbox can ensure reliable lubrication of gear transmission without adjusting the gearbox under low-flush pumping conditions. Significantly longer pump inspection cycle An inefficient pilot well in Southern Texas, USA, has a pumping depth of 2502 meters and a diameter of 25 inches. The top of the pump is a compound sucker rod and eight 1.5-inch diameter rods. Initially, the pump operated at 6.25 strokes, with a stroke length of about 2.2 meters. The well produces sulfur-bearing crude oil and contains high-sulfur natural gas and salt. Despite the chemical treatment, the pump needs to be inspected several times a year due to pump failure, rod breakage and sucker rod wear. The inefficient wells did not replace the sucker rod, but the installation of the middle axis, the stroke down to 4 times. Low-Impulse Pump The suction pump fills up after each stroke (65% when not installed) and eliminates large liquid level impacts. The sucker rod withstands 5 times of stress vibration per stroke. After low-pulse pumping, the number of daily stress and vibration of the sucker rod decreased by 16,200 times. Moreover, the minimum load decreased due to the increase of the maximum load, and the difference between them decreased from 31.8 kN / stroke to 20 kN / stroke. 4 stroke pumping unit less daily extract nearly 20,000 tons, saving 4.4 kWh. The pump has been significantly lengthened by significantly reducing rod wear and the pump has been in continuous operation for seven years. Due to pump energy and oil production to match, both to reduce the friction and vibration load, but also reduce the stress and vibration, therefore, deceleration can extend the life of the pump. Reduce the pump speed to optimize Pumping energy production and ground to match the liquid is to ensure high liquid production and pump life of the key issues. For wells that pump more energy than the reservoir, reducing pump speed is the best way to optimize single-well production. Experiments with more than 500 bar pump wells have demonstrated that pumping fluid with the lowest possible pump speed provides 100% of the usable fluid in the reservoir, minimizing pumping units and sucker rods and preventing The plunger is stuck with solid particles to maximize the life of the pump, maximizing profit with the highest throughput and shortest pump inspection period. Each rod pump pumping excess energy must continuously reduce the pump speed to match the oil production. After changing the pump speed, the working conditions of the downhole must be checked by the dynamometer method.
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