Air separation is not good, one
World general mechanical production method is the screw pump, gear pump pumping, and its common homework topic is the pump can not be full of completely, low productivity, the pump is not completely because of the pump capacity of the output of the well or the pump inlet gas separation is bad, a department pump displacement by gas interference and loss, if eliminate the interference of the gas in the pump and control the pump operation time, match the pump displacement and flow into the bottom, can progress efficiency and reduce the capital. The detailed practice to maintain the high yield of screw pump pumping is as follows:
1. The acoustic wave liquid level should be determined to determine the relative depth of the liquid production level and the screw pump suction inlet. If the liquid level is higher than the pumping inlet, then the well cannot be mined at a large volume. If the gas interference affects the yield, the liquid level is higher than the pump inlet; if the pumping volume is too large to lead to low production, the liquid level should be at the pump inlet or around the pump.
2, the dynamometer determines the pump is full of coefficient percentage, the application of comprehensive data acquisition system can simultaneously obtain motor power and display data. One of the main uses of the work diagram is to diagnose how the pump operates and analyze downhole problems. The application of the production liquid level measurement combined with the power diagram can understand whether the well is produced with large yield, whether the liquid column height is higher than the inlet depth of the pump, whether the pump is not completely full and whether the free gas is transported up along the casing ring space.
3. Diagnostic low-energy-efficiency Wells. The diagnostic method is to determine the total efficiency of the pumping system, and to determine the total efficiency only requires measuring the power of the input original idea, measuring the production pressure at the bottom of the well, and measuring the accurate production test data. The total efficiency of the general swimming beam pumping system should be about 50%, and if it is lower than this, its function should be improved. Technologies to improve overall efficiency include maintaining high volume efficiency (matching the pump specifications with wellbore injection volume, eliminating gas interference, controlling the extraction with a evacuation controller or timer) and replacing excessive electrical thoughts.
4. Downhole gas separation. Invalid gear pump operation is often caused by gas interference, which can be diagnosed by acoustic liquid level measurement and power diagram. Place the suction inlet below the fluid entry section, and if above, use a gas separator. If the valve seat short section is arranged at least 10ft below the bottom of the fluid entry layer, then the effective air separation can occur in the annular air, and then the casing acts as the outer cylinder of the separator. However, the premise of the well often does not allow the pump under the fluid entry layer, so the downhole gas separator is considered. The conventional air separator consists of a fluid entry department (such as perforating segments), an outer cylinder (such as a section of the oil pipe with a plug at the bottom), and a sealing pipe at the bottom of the pump.
5, control the pump displacement, can be controlled by adjusting four kinds of parameters: plunger size, stroke length, pump flush number, daily operation time. Due to the large size of the equipment, the pump with different size is usually not replaced. The simple approach is to change the configuration of the ground equipment, such as moving the beam rod to change the stroke length of the ground and pump; then replace the motor pulley to control the number of the pump driven. The matching problem of pump volume and well capacity can be achieved by changing the daily running time. The following devices can be used to control the running time: air pumping controller, distance timer and percentage timer. Stop the pump if the air pumping controller detects that the pump is not completely full. The timer controls the running time of the pump and is cheaper and simply operated. The duration of the pump stop shall be so short that the production pressure at the bottom of the well rises by no more than 10%.
Each well can be measured by the above acoustic wave and dynamometer for 45min to determine the capacity of the well, the dynamic of underground pump, the dynamic of downhole gas separator, the load of pumping rod and swimming beam pumping unit, and the load of motor pump. Through 45min analysis, the operator can make the well production reach a large, and the homework cost is reduced.
