Oil pumping unit closed-loop control method and system based on underground multiparameter real-time monitoring

Abstract

The invention provides an oil pumping unit closed-loop control method and system based on underground multiparameter real-time monitoring. The method comprises the following steps: A) collecting underground temperature, pressure, moisture content, working fluid level and oil pumping unit working parameters tested by an underground multiparameter tester; B) establishing a data model of the optimum operation mode of the oil pumping unit according to the spot test data, and generating underground temperature, pressure, moisture content, working fluid level and oil pumping unit working parameters aiming at the optimum operation mode of the oil pumping unit; C) comparing whether a comprehensive error value of the underground temperature, pressure, moisture content, working fluid level and oil pumping unit working parameters tested by the underground multiparameter tester and the underground temperature, pressure, moisture content, working fluid level and oil pumping unit working parameters aiming at the optimum operation mode of the oil pumping unit is more than a preset threshold or not; D) if the comprehensive value is more than the preset threshold, adjusting the working condition of the oil pumping unit according to the tested underground temperature, pressure, moisture content, working fluid level and oil pumping unit working parameters aiming at the optimum condition mode of the oil pumping unit. With the method, the working condition of the oil pumping unit can be monitored and adjusted in real time.

Description

technical field [0001] The invention relates to petroleum logging technology, in particular to a closed-loop control method and system for pumping units based on downhole multi-parameter real-time monitoring. Background technique [0002] At present, oil fields with rods at home and abroad generally adopt the method of oil production with rod pumps. The rod pumping system composed of surface pumping units, sucker rods and downhole pumps is a large power consumer in oil production, accounting for about 20% of the total power consumption. 20%-30%. In order to ensure that the pumping unit has sufficient overload capacity, the installed power of the electric motor is usually relatively large, and most of them operate under the working condition of "big horse-drawn cart", resulting in a great waste of energy. Especially when the oil well is in the middle and late stages of production, due to the reduction in production, low liquid level, and unstable liquid level, there are diff...

AI Technical Summary

Problems solved by technology

In order to ensure that the pumping unit has sufficient overload capacity, the installed power of the electric motor is usually relatively large, and most of them operate under the working condition of "big horse-drawn cart", resulting in a great waste of energy

Especially when the oil well is in the middle and late stages of production, due to the reduction in production, low liquid level, and unstable liquid level, there are different degrees of "pumping" and "dry pumping" in the pumping unit during work, which makes the invalid stroke increase and pumping The efficiency of the oil machine cannot be effectively utilized, resulting in high electricity costs during the mining process and a serious waste of energy

Due to the movement characteristics of the pumping unit, the current and power of the pumping unit cannot be changed at any time, and at the same time, the sucker rod and pipe are severely worn, which increases the production operation cost

[0003] Although frequency conversion speed regulation technology has been widely used in oil fields, the current frequency conversion control of pumping units is mainly to set a given frequency based on experience, so that the motor of the pumping unit works at a given frequency. The output characteristics of the motor are relatively hard, and it is not possible Adjust the output torque of the motor according to the real-time working status of the oil well and the load characteristics of the pumping unit, and sometimes there may be problems such as power generation status

[0004] For oil wells that are mainly produced by rod pumps, during the development and production process, parameters such as temperature, pressure, water content, dynamic liquid level, casing pressure, and polished rod suspension point load of the oil well are important production management data. The test of the efficiency mainly adopts the method of manual sampling and testing at the wellhead. The test results cannot timely and continuously reflect the water content changes in the entire production process of the oil well, and at the same time increase the labor intensity of the workers. , Intermittent (non-full pipe flow) and other influences, the error is large

In addition, the dynamic liquid level test of the oil well is mainly carried out by the echo method, which is difficult to achieve online testing, and is affected by factors such as the "foam section" in the annular space and the wax deposition on the well wall, and the test error is relatively large (not more than tens of meters to hundreds of meters). etc.), affecting the correct evaluation of well production

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