subject: Maintain The High Rate Of Screw Pumping Know [print this page] The world's most General Mechanical methods is a screw pump of pumping oil, and its most common problem is the pump operation can not be completely filled, resulting in low productivity, the pump is not completely filled due to the well pump output capacity greater than or not pump gas separator at the entrance Well, part of the pump displacement bullied interference loss, if the gas pump to eliminate the interference and control of pump operation time, the pump displacement and the amount of fluid into the bottom hole match, you can improve efficiency and reduce costs. To maintain the high rate of screw pumping concrete approaches are as follows:
1, surface acoustic wave should be conducted to determine the yield surface and the relative depth of the pump intake. If the liquid level above the pump intake, it is impossible to maximum yield of extraction wells. If the interference effect gas production rate, the liquid level above the pump intake; if pumping excessive lead to low yield, the surface should be pumping at or near the entrance.
2, Indicator Measurement of the pump is full of coefficient of percentage of integrated data acquisition system can be applied to both motor power and indicator data. Indicator diagram of one of the purposes is to diagnose the main pump is running and analysis of how the problem underground. Application of combined production of liquid level measurement indicator diagram to learn whether the maximum yield of the production wells, liquid column height is higher than the pump intake depth, the pump is not completely full, and whether free gas migrates upward along the casing annulus.
3, diagnosis of inefficient wells. Method of diagnosis is to determine the overall efficiency of pumping system, and to determine the efficiency of simply measuring the total input of the original motive power, precise determination of bottom hole pressure and production of production test data. General beam the overall efficiency of pumping system should be about 50%, if less than this should improve its performance. Improve overall efficiency technology, including maintaining high volumetric efficiency (pump shaft into the specifications and amount of matching, to eliminate gas interference, taking the time to control or timer control with pumping) and replace the motor too much.
4, downhole gas separator. Invalid gas pump is often running interference caused by sound level measurement and dynamometer for diagnosis. Would be better to put fluid into the pump inlet below the layers, placed at the top should be used if the gas separator. If a short section of the valve seat arranged in layers of fluid into the bottom of the following at least 10ft, air can occur in the ring effective gas separation, this time from the separator casing outside the tube effect. However, the condition often do not allow wells to pump fluid into the layer below the place, then consider the use of downhole gas separator. Conventional gas separator by the fluid into the part (such as perforation short section), outside the tube (such as the bottom plug of a pipeline), and pump at the bottom of sealing liquid tubes.
5, control the pump displacement can be carried out by adjusting the four kinds of control parameters: plunger size, stroke length, the number of red pumps, a daily operating time. Since the cost of equipment due to large, usually do not replace the wrong size pump. The easiest way is to change the configuration of the ground equipment, such as mobile beam to change the ground rod and pump stroke length; followed by replacing the pump motor pulley to control the impulse number. Well pump capacity and matching capacity to change the date by running time to achieve the following types of devices can be used to control the running time: air pumping controller, interval timer and percentage timer. If the controller detects pumping air pump does not stop at the pump is fully charged. Timer control pump operation time, less expensive and easy to operate. Stop the pump to the bottom of the short duration of pressure should be increased no more than 10% of the reservoir pressure. Operators can use for each well for the acoustic 45min, showing the power meter, etc. to determine the well capacity, dynamic downhole pumps, downhole gas separator dynamic, rod and beam pumping unit load, the motor dynamics. Through the analysis of 45min, the operator can achieve maximum well production, operating cost reduction.
