1. A method for measuring oil well yield by using electromechanical parameters of a beam pumping unit is characterized by comprising the following steps:

1) actually measuring the operation electrical parameter and the suspension point load of the motor of the oil pumping unit, and establishing a following function corresponding relation of the electrical parameter and the suspension point load;

2) capturing a load change singular point of a polished rod suspension point of the oil pumping unit by monitoring the running electrical parameter, and estimating a filling coefficient of the oil pumping unit;

3) the product of the lifting stroke times and the lifting amount of the single pump cylinder every day is the initial single-well daily output, and then the oil well leakage coefficient is determined by metering the oil well by a meter, so that the accurate metering after the oil well output correction is realized.

2. The method for measuring oil well production by using electromechanical parameters of a beam-pumping unit according to claim 1, wherein the method comprises the following steps: in step 1), actually measuring the running electrical parameter of the motor of the pumping unit comprises the following steps:

101) actually measuring the output revolution of the motor and the initial positioning of the rotation period of the crank balance block, and reversely measuring the corresponding proportionality coefficient K by the suspension point load sensor measured by the polished rod load sensor and the motor electrical parameter measured in real time_i，

102) Determining the corresponding proportional coefficient K of the load and the electric parameter of the pumping unit in one period_i；

103) The monitoring electrical parameter is used for capturing the odd change characteristic point of the polished rod suspension point load of the oil pumping unit in a lifting cycle, and the filling coefficient K of the oil well pump is determined_CThe fill factor times the theoretical displacement Q of the pump barrel_LI.e. the well production Q of one lift cycle_iThe product of the lifting stroke C and the lifting amount of the single pump cylinder every day is the initial single well daily output Q_1＝Q_i×C＝Q_L×K_C×C。

3. The method for measuring the oil well production by using the electromechanical parameters of the beam-pumping unit according to claim 1, wherein the oil well loss coefficient determined in the step 3) is as follows:

initial measurement is carried out on the oil well by using a weighing type oil well meter 5 to determine the oil well leakage coefficient K_jThe accurate measurement of oil well output Q ═ Q is directly carried out by monitoring electric parameter₁×K_j+ B, wherein, K_jThe leakage coefficient and the leakage compensation parameter are B.

Background

The pumping unit system converts electric energy into kinetic energy through the motor and the connecting rod structure to realize crude oil lifting. The motor rotates to drag the reduction gearbox through belt transmission and is converted into up-and-down motion of the horse head through the crank walking beam structure, and the horse head motion drives the plunger of the oil well pump to move through the suspension rope and the sucker rod to realize crude oil drawing. The pumping unit system has the characteristic of energy conservation, and energy is transmitted backwards step by the electric energy input of the motor. Although consumption may occur for various reasons during the energy transfer process, there is a certain relationship between the power change at the motor input of the pumping unit and the change of the suspension point load. The operation information of the oil pumping unit can also be reflected in the electric power signal to a certain extent.

The oil well yield is the core data of oil production management, and the oil well yield measurement is carried out by using multiphase flow oil well measuring equipment and a weighing type oil well meter (patent ZL 201720826332.4) in the current oil field, so that the change of the oil well yield can be relatively accurately measured. Because international oil price fluctuates, domestic oil well yield is generally low, the cost of a single-well meter is still high, the research cost required on an oil extraction site is lower, the mode is a relatively simple and reliable single-well metering technology, and a technical method capable of metering the yield while metering the electric energy consumption of an oil pumping machine has research value.

Disclosure of Invention

Aiming at the defects of high cost and the like of a single-well meter in the prior art, the invention aims to provide a low-cost method for measuring the oil well yield by using electromechanical parameters of a beam-pumping unit

In order to solve the technical problems, the invention adopts the technical scheme that:

the invention provides a method for measuring oil well yield by using electromechanical parameters of a beam pumping unit, which comprises the following steps of:

1) actually measuring the operation electrical parameter and the suspension point load of the motor of the oil pumping unit, and establishing a following function corresponding relation of the electrical parameter and the suspension point load;

2) capturing a load change singular point of a polished rod suspension point of the oil pumping unit by monitoring the running electrical parameter, and estimating a filling coefficient of the oil pumping unit;

3) the product of the lifting stroke times and the lifting amount of the single pump cylinder every day is the initial single-well daily output, and then the oil well leakage coefficient is determined by metering the oil well by a meter, so that the accurate metering after the oil well output correction is realized.

In step 1), actually measuring the running electrical parameter of the motor of the pumping unit comprises the following steps:

101) actually measuring the output revolution of the motor and the initial positioning of the rotation period of the crank balance block, and reversely measuring the corresponding proportionality coefficient K by the suspension point load sensor measured by the polished rod load sensor and the motor electrical parameter measured in real time_i，

102) Determining the corresponding proportional coefficient K of the load and the electric parameter of the pumping unit in one period_i；

103) The method comprises the steps of capturing odd-variable characteristic points of polished rod suspension point load of the oil pumping unit in a lifting cycle by using a real-time monitoring electrical parameter, and determining the fill factor K of the oil well pump_CThe fill factor times the theoretical displacement Q of the pump barrel_LI.e. the well production Q of one lift cycle_iThe product of the lifting stroke C and the lifting amount of the single pump cylinder every day is the initial single well daily output Q_1＝Q_i×C＝Q_L×K_C×C。

Determining the oil well loss coefficient in the step 3) as follows:

initial measurement is carried out on the oil well by using a weighing type oil well meter 5 to determine the oil well leakage coefficient K_jThe accurate measurement of oil well output Q ═ Q is directly carried out by monitoring electric parameter₁×K_j+ B, wherein, K_jThe leakage coefficient and the leakage compensation parameter are B.

The invention has the following beneficial effects and advantages:

1. the invention is based on the load sensor and the weighing type oil well meter, and oil well yield is directly measured by electric parameters of the motor of the oil pumping unit; on the basis of acquiring the electric energy consumption of the pumping unit by the electric parameter, the yield data of the oil well is acquired, the system efficiency of the oil well can be directly calculated, a technical basis is provided for the optimized operation of the oil well, the electric energy consumption of the pumping unit can be measured, the yield can be measured, and the electric parameter measuring device has an actual use value.