CN-122014173-A - Remote metering method and system for liquid production amount of screw pump well

Abstract

The invention belongs to the technical field of metering of oil well liquid production, in particular relates to a remote metering method and a remote metering system of screw pump well liquid production, and aims to solve the problems of low prediction accuracy and narrow range in the prior art. The method comprises the steps of calculating liquid production by using a rotating speed method based on standardized data to obtain first liquid production, calculating liquid production by using an IPR curve method to obtain second liquid production, calculating liquid production by using an electric energy method to obtain third liquid production, calculating liquid production by using a big data method to obtain fourth liquid production, calculating error rates of the liquid production and actual liquid production respectively, taking the liquid production corresponding to the minimum error rate as first determined liquid production, taking a method corresponding to the first liquid production as a first determination method, calculating a correction coefficient based on the first determined liquid production and the actual liquid production, calculating the current liquid production of a screw pump well by using the first determination method, and multiplying the current liquid production by the correction coefficient to obtain the current corrected liquid production. The invention improves the accuracy of measuring the liquid production amount of the screw pump well.

Inventors

• CHEN XUEMEI
• XU JINQIANG
• REN GUISHAN
• SU FENG
• ZHOU HUAXING
• LIU QING
• Mi Lifei
• FANG RUI
• HAN TAO
• Zeng Jichu

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (6)

1. 1. A method for remotely metering the liquid production of a screw pump well, which is characterized by comprising the following steps: Performing abnormal data rejection and missing data interpolation processing on the metering data to obtain first data, and performing standardization processing on the first data to obtain standardized data; Calculating liquid production by using a rotational speed method based on standardized data and a rotational speed acquired in real time to obtain first liquid production, calculating liquid production by using an IPR curve method based on the standardized data and pump inlet pressure acquired in real time to obtain second liquid production, calculating liquid production by using an electric energy method based on the standardized data and the rotational speed and sinking pressure acquired in real time to obtain third liquid production, and calculating liquid production by using a big data method based on the standardized data to obtain fourth liquid production; Respectively calculating error rates of the first liquid yield, the second liquid yield, the third liquid yield and the fourth liquid yield and actual liquid yield measured by the tank truck, wherein the liquid yield corresponding to the minimum error rate is used as a first determination liquid yield, and a method corresponding to the first liquid yield is used as a first determination method; calculating the current liquid yield of the screw pump well by using a first determination method, and multiplying the liquid yield by the correction coefficient to obtain the current corrected liquid yield.
2. 2. The method for remotely metering the liquid production amount of a screw pump well according to claim 1, wherein the method for calculating the liquid production amount by using a rotational speed method to obtain the first liquid production amount comprises the following steps: Calculating the theoretical displacement of the screw pump well based on the standardized data: Q th ＝1440*4eDTn*10 -9 ; and then calculating the volumetric efficiency of the screw pump well based on the theoretical displacement of the screw pump well: And then calculating a first liquid yield based on the volumetric efficiency and the theoretical displacement of the screw pump well: Wherein n represents the historical operating speed of the screw pump, n 1 represents the actual test speed of the screw pump, D represents the diameter of the section circle of the rotor of the screw pump, T represents the lead of the stator of the screw pump, e represents the eccentricity of the pump, c represents a constant, Q th represents the theoretical displacement of the screw pump at the speed n, Q re represents the historical displacement of the screw pump when the speed of the screw pump is n, and eta Container with a cover is the volumetric efficiency of the screw pump well.
3. 3. The method for remotely metering the liquid production amount of a screw pump well according to claim 1, wherein the method for calculating the liquid production amount by using an IPR curve method to obtain the second liquid production amount comprises the following steps: Firstly, calculating the bottom hole flow pressure based on the standardized data; P wf ＝P r +ρg(h x -h r ); And then calculating the maximum liquid production amount based on the bottom hole flow pressure: finally, calculating a second liquid yield based on the maximum liquid yield and the collected pump intake pressure: Wherein P wf is bottom hole flow pressure, P r is pump suction pressure, h z is depth in an oil reservoir, h r is pump depth, P d is average stratum pressure, ρ is well fluid density, g is gravity acceleration, Q text is historical liquid yield of a screw pump well, Q max is calculated maximum liquid yield of the screw pump, and Q 2 is second liquid yield.
4. 4. The method for remotely metering the liquid production amount of a screw pump well according to claim 1, wherein the method for calculating the liquid production amount by using an electric energy method to obtain the third liquid production amount comprises the following steps: calculating the liquid yield under unitization based on the standardized data: And then calculating the power consumption under unitization based on the standardized data: Then fitting the liquid yield under the unitization and the power consumption under the unitization to obtain a liquid yield and power consumption regression formula under the unitization: Q u ＝f(E u ); And finally, calculating to obtain a third liquid yield based on a liquid yield power consumption regression formula, real-time power consumption, rotating speed and sinking pressure which are acquired in real time: Q 3 ＝Q u *n 1 *P s1 ＝f(E u1 )*n 1 *P s1 ; Wherein Q u is the liquid yield per unit, E u is the power consumption per unit, Q x is the liquid yield, E u is the power consumption, n is the historical rotation speed, P s is the historical sinking pressure, f (E u ) is the functional relation between the power consumption per unit and the liquid yield per unit, E u1 is the power consumption per unit acquired in real time, n 1 is the rotation speed acquired in real time, P s1 is the sinking pressure acquired in real time, and Q 3 is the third liquid yield.
5. 5. The method for remotely metering the liquid production amount of a screw pump well according to claim 1, wherein the method for calculating the liquid production amount by using a big data method to obtain the fourth liquid production amount comprises the following steps: Calculating the pearson correlation coefficient of each influence parameter and the liquid output of the screw pump well, and taking the influence parameter of which the pearson correlation coefficient is larger than a first threshold value as a characteristic parameter; Taking each characteristic parameter as one sample, setting n samples in total, and taking p number values of each sample as p variables; training n samples, p variables corresponding to each sample and actual liquid production amount corresponding to each sample by using XGBoost intelligent algorithm to obtain a XGBoost model; And (5) bringing the characteristic parameters into the XGBoost model to obtain a fourth liquid yield.
6. 6. A method for remotely metering the liquid production of a screw pump well, the system comprising: The system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring metering data of a screw pump well, performing abnormal data rejection and missing data interpolation processing on the metering data to obtain first data, and performing standardization processing on the first data to obtain standardized data; The liquid yield calculation module is used for calculating liquid yield by using a rotational speed method based on standardized data and real-time acquired rotational speed data to obtain first liquid yield, calculating liquid yield by using an IPR curve method based on the standardized data and real-time acquired pump intake pressure data to obtain second liquid yield; The method determining module is used for respectively calculating error rates of the first liquid yield, the second liquid yield, the third liquid yield and the fourth liquid yield and actual liquid yield measured by the tank truck, wherein the liquid yield corresponding to the minimum error rate is used as a first determined liquid yield, and the method corresponding to the first liquid yield is used as a first determining method; And the corrected liquid production amount calculation module is used for calculating a correction coefficient based on the first determined liquid production amount and the actual liquid production amount, calculating the current liquid production amount of the screw pump well by using a first determination method, and multiplying the current liquid production amount by the correction coefficient to obtain the current corrected liquid production amount.

Description

Remote metering method and system for liquid production amount of screw pump well Technical Field The invention belongs to the technical field of oil well liquid production amount metering, and particularly relates to a screw pump well liquid production amount remote metering method and system. Background At present, two methods for realizing remote metering of liquid production of a screw pump are mainly adopted, namely a differential pressure method and a current method. Differential pressure process. The method is characterized in that production data such as oil pressure, back pressure and the like of a screw pump well are collected in real time, and the liquid production amount is calculated according to a multiphase flow throttling mathematical model, wherein the method comprises a conventional differential pressure method and a European flowmeter standard model method. The conventional differential pressure method is to establish a choke model of the oil nozzle according to the flow rule of fluid passing through the oil nozzle, so as to obtain the basic relation between main flow parameters of the oil-gas mixture passing through the oil nozzle. The European flowmeter standard model method is a multiphase flow throttling calculation method established by applying Bernoulli equation and flow continuity principle, and is matched with an energy consumption mathematical model and a lifting mathematical model of a screw pump to be corrected and fitted, so that a liquid production amount calculation rule applicable to specific well conditions is obtained, and the liquid production amount of the screw pump well under the ground standard condition is calculated. According to the method, the temperature of the fluid in the shaft needs to be accurately solved, the flow rate and the mass flow rate of the fluid are reversely deduced, when the gas content of a single well is increased, the flow rate of the fluid is unstable, the metering error is large, the required parameters are large during calculation of the patent, and the application range is narrow. The current method is based on working condition diagnosis, a relation between current and pump efficiency is established by using a least square method according to actual operation working conditions of the screw pump, then a numerical relation between the pump efficiency and actually measured electrical parameters is determined by using a threshold method according to the pump efficiency of the actual working conditions, and then the liquid production amount of the screw pump well is calculated. Because the liquid yield of the screw pump can change greatly under different working conditions, the remote online metering method of the liquid yield of the screw pump well is based on working condition diagnosis, the average current of a motor is firstly analyzed and screened through measurement and acquisition analysis of electric parameters, the working condition of the screw pump well is judged through a current threshold method, and then a relation curve between the dimensionless current of the motor and the pump efficiency of the screw pump is established by adopting a least square method to obtain the actual pump efficiency of the screw pump, so that the actual liquid yield of the screw pump is calculated. The method needs continuous and accurate collection of the torque of the screw pump, analysis of the second level, the minute level, the hour level and the day level data of the screw pump well, determination of the oil well working condition according to the manually set threshold value, and prediction of the output and the working fluid level according to the oil well working condition. The method has limited maturity, large difference can exist in oil well liquid amount under the same working condition, and the predicted oil well yield accuracy is low. Therefore, the remote metering method for the liquid production amount of the screw pump well in the prior art has the problems of low prediction accuracy and narrow range. Disclosure of Invention In order to solve the problems in the prior art, namely the problems of lower prediction accuracy and narrower range in the screw pump well liquid production remote metering method in the prior art, the invention provides a screw pump well liquid production remote metering method, which is characterized by comprising the following steps: Performing abnormal data rejection and missing data interpolation processing on the metering data to obtain first data, and performing standardization processing on the first data to obtain standardized data; Calculating liquid production by using a rotational speed method based on standardized data and a rotational speed acquired in real time to obtain first liquid production, calculating liquid production by using an IPR curve method based on the standardized data and pump inlet pressure acquired in real time to obtain second liquid production, calculating liquid production by