阅读说明：本技术 一种电特性法原油含水分析仪含水曲线标定系统及方法 (Electrical characteristic method crude oil water content analyzer water content curve calibration system and method ) 是由 于洋 巨萌 陈永勃 艾信 樊晨 田殿龙 吴利利 魏小林 李明江 闫娟 于 2020-11-12 设计创作，主要内容包括：本发明属于石油行业测量仪表领域,具体涉及一种电特性法原油含水分析仪含水曲线标定系统及方法。本发明包括外循环机构、加气机构、内循环机构和数据采集机构；所述的外循环机构和加气机构分别与内循环机构连通；所述的数据采集机构分别与外循环机构、加气机构和内循环机构电信号连接。本发明通过调整电特性法原油含水分析仪被测样本的温度、压力、矿化度、含气率等条件,模拟现场使用环境,来对电特性法含水分析仪含水曲线进行标定,有效提高了含水分析仪测量精度。(The invention belongs to the field of measuring instruments in the petroleum industry, and particularly relates to a system and a method for calibrating a water content curve of a crude oil water content analyzer by using an electrical characteristic method. The invention comprises an external circulation mechanism, a gas filling mechanism, an internal circulation mechanism and a data acquisition mechanism; the external circulation mechanism and the air-entrapping mechanism are respectively communicated with the internal circulation mechanism; the data acquisition mechanism is respectively connected with the outer circulation mechanism, the gas filling mechanism and the inner circulation mechanism through electric signals. The method provided by the invention can be used for calibrating the water content curve of the water content analyzer based on the electrical characteristic method by adjusting the conditions of the temperature, the pressure, the mineralization degree, the gas content and the like of the tested sample of the crude oil water content analyzer based on the electrical characteristic method and simulating the field use environment, so that the measurement precision of the water content analyzer is effectively improved.)

1. A calibration system for a water content curve of a crude oil water content analyzer by an electrical characteristic method is characterized in that: the device comprises an external circulation mechanism, a gas filling mechanism, an internal circulation mechanism and a data acquisition mechanism; the outer circulation mechanism and the air-entrapping mechanism are communicated with the inner circulation mechanism after meeting; the data acquisition mechanism is respectively connected with the outer circulation mechanism, the gas filling mechanism and the inner circulation mechanism through electric signals.

2. The electrical property method crude oil water content analyzer water content curve calibration system of claim 1, wherein: the external circulation mechanism comprises an oil-water separator (1), a water pipeline (21) and an oil pipeline (22); a liquid inlet is formed in the bottom of the oil-water separator (1), a water outlet is formed in the side wall of the lower portion of the oil-water separator (1), and an oil outlet is formed in the top of the oil-water separator (1); one end of the water pipeline (21) is communicated with a water outlet of the oil-water separator (1); one end of the oil pipeline (22) is communicated with an oil outlet of the oil-water separator (1), and the other end of the oil pipeline (22) is communicated with the other end of the water pipeline (21) and then is connected with the internal circulation mechanism; the oil pipeline (22) is sequentially provided with a filter (3), an oil pump (4), a first valve (23) and an oil flowmeter (7) from the oil-water separator (1) to the internal circulation mechanism; the water pipeline (21) is sequentially provided with a filter (3), a water pump (5), a second valve (24) and a water flow meter (8) from the oil-water separator (1) to the internal circulation mechanism; the liquid inlet is communicated with the internal circulation mechanism.

3. The electrical property method crude oil water content analyzer water content curve calibration system of claim 1, wherein: the air-entrapping mechanism comprises an air pump (2), an air pipeline (20), a third valve (25) and a gas flowmeter (9); the air pump (2) is communicated with the internal circulation mechanism through an air pipeline (20); and a third valve (25) and a gas flowmeter (9) are arranged on the gas pipeline (20).

4. The electrical property method crude oil water content analyzer water content curve calibration system of claim 1, wherein: the internal circulation mechanism comprises a filter (3), a mixing and transporting pump (6), a phase mixer (10), a pressure test pump (11), a medicine adding section (12), an electric heating pipe (13), a temperature sensor (15), a pressure sensor (16), a fourth valve (26), a fifth valve (27), a sixth valve (28), a seventh valve (29), a water content instrument (30) and a closed internal circulation pipeline (19); the phase mixer (10), the pressure test pump (11), the dosing section (12), the electric heating pipe (13), the water content instrument (30), the temperature sensor (15), the pressure sensor (16), the sixth valve (28), the filter (3), the mixing and transportation pump (6) and the fourth valve (26) are sequentially arranged on the inner circulation pipeline (19); an inlet of an internal circulation pipeline (19) is arranged on a pipeline between the fourth valve (26) and the phase mixer (10), a fifth valve (27) is arranged on the inlet of the internal circulation pipeline (19), and the fifth valve (27) is communicated with a pipeline after the other end of the oil pipeline (22) in the external circulation mechanism is communicated with the other end of the water pipeline (21); an outlet of the internal circulation pipeline (19) is arranged on a pipeline between the sixth valve (28) and the pressure sensor (16), a seventh valve (29) is arranged on the outlet of the internal circulation pipeline (19), and the seventh valve (29) is communicated with a liquid inlet arranged at the bottom of the oil-water separator (1) in the external circulation mechanism; an exhaust valve (14) is arranged on a pipeline between the electric heating pipe (13) and the water content meter (30).

5. The electrical property method crude oil water content analyzer water content curve calibration system of claim 4, wherein: the dosing section (12) is provided with a stirrer.

6. The electrical property method crude oil water content analyzer water content curve calibration system of claim 1, wherein: the data acquisition mechanism comprises a PLC (programmable logic controller) controller (17) and a computer (18); the PLC (17) is respectively connected with the computer (18), the external circulation mechanism, the gas filling mechanism and the internal circulation mechanism through electric signals.

7. The method for calibrating the water content curve calibration system of the electrical characteristic method crude oil water content analyzer according to any one of claims 1 to 6, comprising the steps of,

the method comprises the following steps: determining working condition data of wellhead pressure, temperature, produced liquid mineralization and gas content of a crude oil water content analyzer installation well by an electrical characteristic method;

step two; the PLC (17) controls the opening of a first valve (23), a second valve (24), a third valve (25), a fourth valve (26), a fifth valve (27) and a sixth valve (28); the oil and the water separated by the oil-water separator (1) are respectively sent into an internal circulation pipeline (19) through an oil pump (4) and a water pump (5), and the air is sent into the internal circulation pipeline (19) through an air pump (2); the oil flowmeter (7), the water flowmeter (8) and the gas flowmeter (9) respectively measure the oil, the water and the gas which pass through; after the preset flow is reached, the PLC (17) controls to close the first valve (23), the second valve (24), the third valve (25) and the fifth valve (27) and stop the oil pump (4), the water pump (5) and the air pump (2) to enable the ratio gas content to reach the determined value in the first step and the water content to be a set value;

step three: the PLC (17) controls to start the pressure test pump (11) and pressurize the internal circulation pipeline (19); the electric heating pipe (13) is electrified for heating, and the PLC (17) acquires data of the pressure transmitter (16) and the temperature transmitter (15) and transmits the data to the computer (18), so that the pressure and the temperature of the mixed sample in the pipeline are maintained at the determined values in the first step;

step four: salt is weighed, the weighed salt is added into the mixed liquid sample from the dosing section (12), and the mixed liquid sample is fully and uniformly stirred by a stirrer, so that the mineralization degree of the mixed liquid sample reaches the determination value of the mineralization degree of the produced liquid in the step one;

step five: the PLC (17) controls the start of the mixing pump (6), the mixed liquid sample is conveyed by the mixing pump (6), and after being fully and uniformly mixed for many times by the phase mixer (10), the output current signal value of the moisture meter (30) is observed and recorded to obtain a data point on a moisture curve;

step six: repeating the first step to the fifth step, changing the water content of the mixed solution by increasing the oil or water flow, and correspondingly increasing the gas flow and the salt adding amount to ensure that the gas content, the mineralization degree, the temperature and the pressure are the determined values in the first step; mixing the water content mixed samples of different groups in sequence by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording the water content of different groups and output current signal value data corresponding to the water content meter (30);

step seven: the PLC (17) controls to open the exhaust valve (14) and exhaust gas in the internal circulation pipeline (19); the seventh valve (29) is controlled to be opened, and the sixth valve (28) is controlled to be closed, so that the oil-water mixed liquid enters the oil-water separator (1) for separation;

step eight: and drawing to obtain a crude oil water content curve according to different groups of data obtained in the step six.

Technical Field

The invention belongs to the field of measuring instruments in the petroleum industry, and particularly relates to a system and a method for calibrating a water content curve of a crude oil water content analyzer by using an electrical characteristic method.

Background

The water content analyzer is an automatic instrument capable of realizing real-time online measurement of the water content of crude oil, and compared with a manual sampling and testing method, the water content analyzer is widely applied due to the advantages of strong real-time performance, high working efficiency and the like, wherein the water content analyzer based on an electrical property method such as a capacitance method, a radio frequency method, an electromagnetic wave method and the like is most commonly applied to an oil well head due to the price advantage. The water content curve of the water content instrument by the electrical characteristic method is a one-to-one corresponding relation curve of a water content instrument output current signal value (4-20 milliamperes) and a water content measurement result (0-100%), and a plurality of oil-water mixed liquid samples with known and different water contents need to be proportioned for measurement before delivery. However, there are problems as follows: in the measurement process, the environment of the experimental sample is normal temperature and normal pressure, the sample is a mixed solution of pure oil and pure water, the influence of factors such as temperature, pressure, mineralization degree, gas content and the like on the complex working conditions of the wellhead is not considered, and the measured water content curve is not suitable for crude oil measurement of the wellhead on site, so that the measurement precision of the water content analyzer is reduced, and the requirement of production on site cannot be met. At present, a system and a calibration method which can simulate the field working condition of an oil well wellhead and can calibrate and calibrate the water content curve of the water content analyzer by an electrical characteristic method are lacked.

Disclosure of Invention

The invention provides a system and a method for calibrating a water content curve of a crude oil water content analyzer by an electrical characteristic method, and aims to provide a system and a method for calibrating the water content curve of the water content analyzer by the electrical characteristic method by adjusting the conditions of a tested sample of the water content analyzer, such as temperature, pressure, mineralization degree, air void ratio and the like, and simulating a field use environment, so as to improve the measurement accuracy of the water content analyzer.

In order to achieve the purpose, the invention adopts the technical scheme that:

a calibration system for a water content curve of a crude oil water content analyzer by an electrical characteristic method comprises an external circulation mechanism, a gas filling mechanism, an internal circulation mechanism and a data acquisition mechanism; the outer circulation mechanism and the air-entrapping mechanism are communicated with the inner circulation mechanism after meeting; the data acquisition mechanism is respectively connected with the outer circulation mechanism, the gas filling mechanism and the inner circulation mechanism through electric signals.

The external circulation mechanism comprises an oil-water separator, a water pipeline and an oil pipeline; a liquid inlet is formed in the bottom of the oil-water separator, a water outlet is formed in the side wall of the lower portion of the oil-water separator, and an oil outlet is formed in the top of the oil-water separator; one end of the water pipeline is communicated with a water outlet of the oil-water separator; one end of the oil pipeline is communicated with an oil outlet of the oil-water separator, and the other end of the oil pipeline is communicated with the other end of the water pipeline and then connected with the internal circulation mechanism; the oil pipeline is sequentially provided with a filter, an oil pump, a first valve and an oil flowmeter from the oil-water separator to the internal circulation mechanism; the water pipeline is sequentially provided with a filter, a water pump, a second valve and a water flow meter from the oil-water separator to the internal circulation mechanism; the liquid inlet is communicated with the internal circulation mechanism.

The gas filling mechanism comprises a gas pump, a gas pipeline, a third valve and a gas flowmeter; the air pump is communicated with the internal circulation mechanism through an air pipeline; and a third valve and a gas flowmeter are arranged on the gas pipeline.

The internal circulation mechanism comprises a filter, a mixing and transporting pump, a phase mixer, a pressure test pump, a dosing section, an electric heating pipe, a temperature sensor, a pressure sensor, a fourth valve, a fifth valve, a sixth valve, a seventh valve, a water content meter and a closed internal circulation pipeline; the phase mixer, the pressure test pump, the dosing section, the electric heating pipe, the water content instrument, the temperature sensor, the pressure sensor, the sixth valve, the filter, the mixing transportation pump and the fourth valve are sequentially arranged on the inner circulation pipeline; an inlet of an internal circulation pipeline is arranged on a pipeline between the fourth valve and the phase mixer, a fifth valve is arranged on the inlet of the internal circulation pipeline, and the fifth valve is communicated with a pipeline after the other end of the oil pipeline in the external circulation mechanism is communicated with the other end of the water pipeline; an outlet of the internal circulation pipeline is arranged on a pipeline between the sixth valve and the pressure sensor, a seventh valve is arranged on the outlet of the internal circulation pipeline, and the seventh valve is communicated with a liquid inlet arranged at the bottom of the oil-water separator in the external circulation mechanism; an exhaust valve is arranged on a pipeline between the electric heating pipe and the water content instrument.

The dosing section is provided with a stirrer.

The data acquisition mechanism comprises a PLC controller and a computer; the PLC controller is respectively connected with the computer, the external circulation mechanism, the gas filling mechanism and the internal circulation mechanism through electric signals.

A calibration method of a water content curve calibration system of a crude oil water content analyzer by an electrical characteristic method comprises the following steps,

the method comprises the following steps: determining working condition data of wellhead pressure, temperature, produced liquid mineralization and gas content of a crude oil water content analyzer installation well by an electrical characteristic method;

step two; the PLC controller controls the opening of a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve; the oil and water separated by the oil-water separator are respectively sent into an internal circulation pipeline through an oil pump and a water pump, and the air is sent into the internal circulation pipeline through an air pump; the oil flow meter, the water flow meter and the gas flow meter respectively meter the passing oil, water and gas; after the preset flow is reached, the PLC controller controls the first valve, the second valve, the third valve and the fifth valve to be closed, and the oil pump, the water pump and the gas pump are stopped, so that the ratio gas content reaches the determined value in the first step, and the water content is a set value;

step three: the PLC controller controls to start the pressure test pump and pressurize the internal circulation pipeline; electrifying the electric heating pipe for heating, and acquiring data of the pressure transmitter and the temperature transmitter by the PLC and transmitting the data to the computer so that the pressure and the temperature of the mixed sample in the pipeline are maintained at the determined values in the first step;

step four: weighing salt, adding the weighed salt into the mixed liquid sample from the dosing section, and fully and uniformly stirring by using a stirrer to ensure that the mineralization degree of the mixed liquid sample reaches the determined value of the mineralization degree of the produced liquid in the step one;

step five: the PLC controller controls and starts the mixed liquid conveying pump, the mixed liquid sample is conveyed by the mixed liquid conveying pump, and after being fully and uniformly mixed for many times by the phase mixer, the output current signal value of the water content instrument is observed and recorded, and a data point on the water content curve is obtained;

step six: repeating the first step to the fifth step, changing the water content of the mixed solution by increasing the oil or water flow, and correspondingly increasing the gas flow and the salt adding amount to ensure that the gas content, the mineralization degree, the temperature and the pressure are the determined values in the first step; sequentially proportioning the mixed samples with different groups of water contents by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording the water content of different groups and output current signal value data corresponding to the water content instrument;

step seven: the PLC controller controls to open the exhaust valve to exhaust gas in the internal circulation pipeline; controlling to open the seventh valve and close the sixth valve to enable the oil-water mixed liquid to enter an oil-water separator for separation;

step eight: and drawing to obtain a crude oil water content curve according to different groups of data obtained in the step six.

Has the advantages that:

the method provided by the invention can be used for calibrating the water content curve of the electrical characteristic method water content analyzer by adjusting the conditions of the tested sample of the water content analyzer, such as temperature, pressure, mineralization degree and gas content, and simulating the field use environment, thereby effectively improving the measurement precision of the water content analyzer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of the calibration system of the present invention.

In the figure: 1-oil-water separator; 2, an air pump; 3-a filter; 4-an oil pump; 5, a water pump; 6-mixed transportation pump; 7-an oil flow meter; 8-water flow meter; 9-a gas flow meter; 10-a phase mixer; 11-a pressure test pump; 12-dosing section; 13-an electric heating tube; 14-an exhaust valve; 15-a temperature sensor; 16-a pressure sensor; 17-a PLC controller; 18-a computer; 19-internal circulation pipes; 20-a gas pipeline; 21-a water conduit; 22-oil pipe; 23-a first valve; 24-a second valve; 25-a third valve; 26-a fourth valve; 27-a fifth valve; 28-a sixth valve; 29-a seventh valve; 30-moisture meter.

The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a more clear understanding of the technical features of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1, the system for calibrating the water content curve of the crude oil water content analyzer by using the electrical characteristic method comprises an external circulation mechanism, an air filling mechanism, an internal circulation mechanism and a data acquisition mechanism; the outer circulation mechanism and the air-entrapping mechanism are communicated with the inner circulation mechanism after meeting; the data acquisition mechanism is respectively connected with the outer circulation mechanism, the gas filling mechanism and the inner circulation mechanism through electric signals.

In specific application, the external circulation mechanism is used for carrying out oil-water separation on the mixed solution and adding the internal circulation mechanism according to the requirement; the air-entrapping mechanism injects air into the internal circulation mechanism according to requirements, so that the gas content of mixed liquid in the internal circulation mechanism reaches the gas content of produced liquid of the installation well, and the internal circulation mechanism fully mixes the entering oil, water, gas and added salt to reach the pressure in the installation well, the temperature of the well mouth, the mineralization degree of the produced liquid and the gas content. And (3) sequentially proportioning a plurality of groups of mixed samples with different water contents by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording the data of the water content of each group and the corresponding output current signal value of the water content instrument. And drawing a water content curve of the water content analyzer according to the obtained multiple groups of data.

The invention simulates the field use environment to calibrate the water content curve of the electrical characteristic method water content analyzer, thereby effectively improving the measurement precision of the water content analyzer.

Example two:

referring to a water content curve calibration system of a crude oil and water analyzer by an electrical characteristic method shown in fig. 1, on the basis of the first embodiment, the external circulation mechanism comprises an oil-water separator 1, a water pipeline 21 and an oil pipeline 22; a liquid inlet is formed in the bottom of the oil-water separator 1, a water outlet is formed in the side wall of the lower portion of the oil-water separator 1, and an oil outlet is formed in the top of the oil-water separator 1; one end of the water pipeline 21 is communicated with a water outlet of the oil-water separator 1; one end of the oil pipeline 22 is communicated with an oil outlet of the oil-water separator 1, and the other end of the oil pipeline 22 is communicated with the other end of the water pipeline 21 and then is connected with the internal circulation mechanism; the oil pipeline 22 is sequentially provided with a filter 3, an oil pump 4, a first valve 23 and an oil flowmeter 7 from the oil-water separator 1 to the internal circulation mechanism; the water pipeline 21 is sequentially provided with a filter 3, a water pump 5, a second valve 24 and a water flow meter 8 from the oil-water separator 1 to the internal circulation mechanism; the liquid inlet is communicated with the internal circulation mechanism.

During actual use, oil and water separated by the oil-water separator 1 are respectively sent into the internal circulation pipeline 19 through the oil pump 4 and the water pump 5, and the oil flow meter 7 and the water flow meter 8 respectively measure the passed oil and water, so that the water content of mixed liquid proportioned in the internal circulation mechanism respectively reaches each sample value from 0 to 100% required by a calibration experiment.

Example three:

referring to a water content curve calibration system of an electrical characteristic method crude oil water content analyzer shown in fig. 1, on the basis of the first embodiment, the gas filling mechanism comprises a gas pump 2, a gas pipeline 20, a third valve 25 and a gas flowmeter 9; the air pump 2 is communicated with the internal circulation mechanism through an air pipeline 20; the air pipeline 20 is provided with a third valve 25 and a gas flowmeter 9.

In practical use, air is sent into the internal circulation pipeline 19 through the air pump 2, the air pipeline 20, the third valve 25 and the gas flowmeter 9, so that the gas content of the mixed liquid prepared in the internal circulation pipeline 19 reaches the gas content of a known well in which the water content analyzer is installed, and a foundation is laid for accurate calibration of a water content curve of the water content analyzer.

Example four:

referring to the water content curve calibration system of the electrical characteristic method crude oil water content analyzer shown in fig. 1, on the basis of the first embodiment, the internal circulation mechanism comprises a filter 3, a mixing and transportation pump 6, a phase mixer 10, a pressure testing pump 11, a dosing section 12, an electric heating pipe 13, a temperature sensor 15, a pressure sensor 16, a fourth valve 26, a fifth valve 27, a sixth valve 28, a seventh valve 29, a water content analyzer 30 and a closed internal circulation pipeline 19; the phase mixer 10, the pressure test pump 11, the dosing section 12, the electric heating pipe 13, the water content instrument 30, the temperature sensor 15, the pressure sensor 16, the sixth valve 28, the filter 3, the mixing and transportation pump 6 and the fourth valve 26 are sequentially arranged on the inner circulation pipeline 19; an inlet of an internal circulation pipeline 19 is arranged on a pipeline between the fourth valve 26 and the phase mixer 10, a fifth valve 27 is arranged on the inlet of the internal circulation pipeline 19, and the fifth valve 27 is communicated with a pipeline after the other end of the oil pipeline 22 in the external circulation mechanism is communicated with the other end of the water pipeline 21; an outlet of the internal circulation pipeline 19 is arranged on a pipeline between the sixth valve 28 and the pressure sensor 16, a seventh valve 29 is arranged on the outlet of the internal circulation pipeline 19, and the seventh valve 29 is communicated with a liquid inlet arranged at the bottom of the oil-water separator 1 in the external circulation mechanism; an exhaust valve 14 is provided on the pipe between the electric heating pipe 13 and the water content meter 30.

Further, a stirrer is arranged on the dosing section 12.

In actual use, after the pressure test pump 11 is started, the pressure is pressed into the internal circulation pipeline 19; the electric heating pipe 13 is electrified and heated, the readings of the pressure transmitter 16 and the temperature transmitter 15 are observed, and the pressure and the temperature of the mixed sample in the internal circulation pipeline 19 are ensured to be maintained at the pressure and the temperature of the well mouth of the known well installed with the crude oil water content analyzer by the electric characteristic method. And (3) weighing a certain amount of salt, adding the mixed solution sample from the dosing section 12, and fully and uniformly stirring by using a stirrer to ensure that the mineralization degree of the mixed solution sample reaches the mineralization degree of the produced liquid in the known well installed with the crude oil and water analyzer by the electrical characteristic method. The mixed liquid sample is conveyed by the mixing and conveying pump 6, fully mixed for a plurality of times by the phase mixer 10, continuously circulated in the internal circulation pipeline 19 until the mixed liquid sample is stable, and then the output current signal value of the water content instrument 30 is observed and recorded to obtain a data point on the water content curve. The water content of the mixed liquid is changed by increasing the oil or water flow, and the gas flow and the salt adding amount are correspondingly increased, so that the mineralization degree, the gas content, the temperature and the pressure of the mixed liquid in the internal circulation pipeline 19 are ensured to be the same as the mineralization degree, the gas content, the temperature and the pressure of the produced liquid in a known well in which the crude oil water content analyzer is installed by an electrical characteristic method. And sequentially proportioning a plurality of groups of mixed samples with different water contents by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording the data of the water contents of the groups and the corresponding output current signal value of the water content instrument 30, thereby laying a foundation for drawing a water content curve of a known well in which the crude oil water content analyzer is installed by an electric characteristic method.

Example five:

referring to a water content curve calibration system of an electrical characteristic method crude oil water content analyzer shown in FIG. 1, on the basis of the first embodiment: the data acquisition mechanism comprises a PLC (programmable logic controller) 17 and a computer 18; the PLC 17 is respectively connected with the computer 18, the external circulation mechanism, the gas filling mechanism and the internal circulation mechanism through electric signals.

In actual use, the PLC 17 is respectively connected with the computer 18, the external circulation mechanism, the air-entrapping mechanism and the internal circulation mechanism through electric signals, so that the data acquisition function of the system is completed, and through organic cooperation among the two mechanisms, various parameter values of a mixed liquid sample and signal values output by the crude oil water content analyzer based on the electrical characteristic method are acquired, displayed and recorded.

Example six:

referring to a water content curve calibration system of an electrical characteristic method crude oil water content analyzer shown in FIG. 1, on the basis of the first embodiment: the external circulation mechanism comprises an oil-water separator 1, a water pipeline 21 and an oil pipeline 22; a liquid inlet is formed in the bottom of the oil-water separator 1, a water outlet is formed in the side wall of the lower portion of the oil-water separator 1, and an oil outlet is formed in the top of the oil-water separator 1; one end of the water pipeline 21 is communicated with a water outlet of the oil-water separator 1; one end of the oil pipeline 22 is communicated with an oil outlet of the oil-water separator 1, and the other end of the oil pipeline 22 is communicated with the other end of the water pipeline 21 and then is connected with the internal circulation mechanism; the oil pipeline 22 is sequentially provided with a filter 3, an oil pump 4, a first valve 23 and an oil flowmeter 7 from the oil-water separator 1 to the internal circulation mechanism; the water pipeline 21 is sequentially provided with a filter 3, a water pump 5, a second valve 24 and a water flow meter 8 from the oil-water separator 1 to the internal circulation mechanism; the liquid inlet is communicated with the internal circulation mechanism; the air-entrapping mechanism comprises an air pump 2, an air pipeline 20, a third valve 25 and a gas flowmeter 9; the air pump 2 is communicated with the internal circulation mechanism through an air pipeline 20; the air pipeline 20 is provided with a third valve 25 and a gas flowmeter 9; the internal circulation mechanism comprises a filter 3, a mixing and transporting pump 6, a phase mixer 10, a pressure test pump 11, a dosing section 12, an electric heating pipe 13, a temperature sensor 15, a pressure sensor 16, a fourth valve 26, a fifth valve 27, a sixth valve 28, a seventh valve 29 and a water content meter 30; the phase mixer 10, the pressure test pump 11, the dosing section 12, the electric heating pipe 13, the water content instrument 30, the temperature sensor 15, the pressure sensor 16, the sixth valve 28, the filter 3, the mixing and transportation pump 6 and the fourth valve 26 are sequentially connected in a clockwise direction to form a closed internal circulation pipeline 19; an inlet is arranged on a pipeline between the fourth valve 26 and the phase mixer 10, and a fifth valve 27 is arranged on the inlet; an outlet is arranged on the pipeline between the sixth valve 28 and the pressure sensor 16, and a seventh valve 29 is arranged on the outlet; an exhaust valve 14 is arranged on a pipeline between the electric heating pipe 13 and the water content meter 30; a stirrer is arranged on the dosing section 12; the data acquisition mechanism comprises a PLC (programmable logic controller) 17 and a computer 18; the PLC 17 is respectively connected with a computer 18, an air pump 2, an oil pump 4, a water pump 5, a mixing transmission pump 6, an oil flow meter 7, a water flow meter 8, a gas flow meter 9, a phase mixer 10, a pressure test pump 11, an exhaust valve 14, a temperature sensor 15, a pressure sensor 16, a first valve 23, a second valve 24, a third valve 25, a fourth valve 26, a fifth valve 27, a sixth valve 28, a seventh valve 29 and a water content meter 30 through electric signals.

When the device is actually used, firstly, determining the working condition data of the pressure and the temperature of a well mouth of a crude oil water content analyzer installation well, the mineralization degree of produced liquid and the gas content by using an electrical characteristic method; subsequently, the PLC controller 17 controls to open the first valve 23, the second valve 24, the third valve 25, the fourth valve 26, the fifth valve 27, and the sixth valve 28; the oil and water separated by the oil-water separator 1 are respectively sent into an internal circulation pipeline 19 through an oil pump 4 and a water pump 5, and the air is sent into the internal circulation pipeline 19 through an air pump 2; the oil flowmeter 7, the water flowmeter 8 and the gas flowmeter 9 respectively measure the oil, the water and the gas passing through; after the preset flow is reached, the PLC 17 controls and closes the first valve 23, the second valve 24, the third valve 25 and the fifth valve 27 and stops the oil pump 4, the water pump 5 and the air pump 2, so that the ratio gas content reaches the determined value in the first step and the water content is a set value; the PLC 17 controls the pressure test pump 11 to be started and presses the internal circulation pipeline 19; the electric heating pipe 13 is electrified for heating, and the PLC 17 acquires data of the pressure transmitter 16 and the temperature transmitter 15 and transmits the data to the computer 18, so that the pressure and the temperature of the mixed sample in the pipeline are maintained at the determined working condition data of the installation well; then, salt is weighed, the weighed salt is added into the mixed liquid sample from the medicine adding section 12, and the mixed liquid sample is fully and uniformly stirred by a stirrer, so that the mineralization degree of the mixed liquid sample reaches the determination value of the mineralization degree of the produced liquid in the step one; the PLC 17 controls the start of the mixing pump 6, the mixed liquid sample is conveyed by the mixing pump 6, and after being fully and uniformly mixed for multiple times by the phase mixer 10, the output current signal value of the moisture meter 30 is observed and recorded to obtain a data point on a moisture curve; repeating the above process, changing the water content of the mixed solution by increasing oil or water flow, and correspondingly increasing gas flow and salt adding amount to ensure that the gas content, the mineralization degree, the temperature and the pressure are the determined values in the first step; mixing the water content mixed samples of different groups in sequence by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording output current signal value data corresponding to the water content instrument 30 and the water content of different groups; the PLC 17 controls the opening of the exhaust valve 14 to exhaust the gas in the internal circulation pipeline 19; the seventh valve 29 is controlled to be opened, the sixth valve 28 is controlled to be closed, and the oil-water mixed liquid enters the oil-water separator 1 for separation; and drawing to obtain a crude oil water content curve according to the obtained different group data.

The oil-water separator 1, the filter 3, the oil pump 4, the water pump 5, the mixing pump 6, the phase mixer 10 and the valves form a power circulation part of the system, and the part is used for conveying oil-water mixed liquid samples with different water contents to the internal circulation pipeline 19 and circulating in the internal circulation pipeline 19. The air pump 2, the pressure test pump 11, the dosing section 12 and the electric heating pipe 13 form a parameter simulation control part of the system, and the parameter simulation control part is used for adjusting the air content, the temperature, the pressure and the mineralization degree of a mixed liquid sample in the circulating pipeline 19. The oil flowmeter 7, the water flowmeter 8, the gas flowmeter 9, the temperature sensor 15, the pressure sensor 16, the PLC 17 and the computer 18 form a data acquisition part of the system, and the data acquisition part is used for acquiring, displaying and recording various parameter values of the mixed liquid sample and output signal values of the water content analyzer.

The system and the method for calibrating the water content curve of the water content analyzer by the electrical characteristic method simulate the field use environment by adjusting the conditions of the temperature, the pressure, the mineralization degree, the gas content and the like of the tested sample of the water content analyzer, and effectively improve the measurement precision of the water content analyzer.

Example seven:

a calibration method of a water content curve calibration system of a crude oil water content analyzer by an electrical characteristic method comprises the following steps,

the method comprises the following steps: determining working condition data of wellhead pressure, temperature, produced liquid mineralization and gas content of a crude oil water content analyzer installation well by an electrical characteristic method;

step two; the PLC 17 controls the opening of a first valve 23, a second valve 24, a third valve 25, a fourth valve 26, a fifth valve 27 and a sixth valve 28; the oil and water separated by the oil-water separator 1 are respectively sent into an internal circulation pipeline 19 through an oil pump 4 and a water pump 5, and the air is sent into the internal circulation pipeline 19 through an air pump 2; the oil flowmeter 7, the water flowmeter 8 and the gas flowmeter 9 respectively measure the oil, the water and the gas passing through; after the preset flow is reached, the PLC 17 controls to close the first valve 23, the second valve 24, the third valve 25 and the fifth valve 27 and stop the oil pump 4, the water pump 5 and the air pump 2, so that the ratio gas content reaches the determined value in the first step and the water content is a set value;

step three: the PLC 17 controls the pressure test pump 11 to be started and presses the internal circulation pipeline 19; the electric heating pipe 13 is electrified for heating, and the PLC 17 acquires data of the pressure transmitter 16 and the temperature transmitter 15 and transmits the data to the computer 18, so that the pressure and the temperature of the mixed sample in the pipeline are maintained at the determined values in the first step;

step four: salt is weighed, the weighed salt is added into the mixed liquid sample from the dosing section 12, and the mixed liquid sample is fully and uniformly stirred by a stirrer, so that the mineralization degree of the mixed liquid sample reaches the determination value of the mineralization degree of the produced liquid in the step one;

step five: the PLC 17 controls the start of the mixing pump 6, the mixed liquid sample is conveyed by the mixing pump 6, and after being fully and uniformly mixed for multiple times by the phase mixer 10, the output current signal value of the moisture meter 30 is observed and recorded to obtain a data point on a moisture curve;

step six: repeating the first step to the fifth step, changing the water content of the mixed solution by increasing the oil or water flow, and correspondingly increasing the gas flow and the salt adding amount to ensure that the gas content, the mineralization degree, the temperature and the pressure are the determined values in the first step; mixing the water content mixed samples of different groups in sequence by taking 5% as a step length from the water content of 0 to the water content of 100%, and recording output current signal value data corresponding to the water content instrument 30 and the water content of different groups;

step seven: the PLC 17 controls the opening of the exhaust valve 14 to exhaust the gas in the internal circulation pipeline 19; the seventh valve 29 is controlled to be opened, the sixth valve 28 is controlled to be closed, and the oil-water mixed liquid enters the oil-water separator 1 for separation;

step eight: and drawing to obtain a crude oil water content curve according to different groups of data obtained in the step six. Example eight:

the concrete calibration process of the calibration method for the water content curve of the water content instrument by the electrical characteristic method is described by taking the working conditions of the XX-XX wellhead of the tableland, wherein the wellhead pressure of the installation well is 0.8MPa, the wellhead temperature is 15 ℃, the mineralization degree of produced liquid is about 50000mg/L and the gas content is about 10%, as examples.

(1) The first valve 23, the second valve 24, the third valve 25, the fourth valve 26, the fifth valve 27 and the sixth valve 28 are opened, the oil and the water separated by the oil-water separator 1 are respectively sent into the internal circulation pipeline 19 through the oil pump 4 and the water pump 5, the air is sent into the internal circulation pipeline 19 through the air pump 2, the air is respectively metered by the oil flowmeter 7, the water flowmeter 8 and the gas flowmeter 9, the first valve 23, the second valve 24, the third valve 25 and the fifth valve 27 are closed after the preset flow is reached, the oil pump 4, the water pump 5 and the air pump 2 are stopped from pumping, and the oil, water and gas three-phase mixed liquid sample with the gas content of 10% and the water content of a set value is matched.

(2) Starting the pressure test pump 11, and pressurizing the internal circulation pipeline 19; the electric heating pipe 13 is electrified and heated, the readings of the pressure transmitter 16 and the temperature transmitter 15 are observed, and the pressure and the temperature of the mixed sample in the pipeline are kept at 0.8MPa and 15 ℃.

(3) Weighing a certain amount of salt, adding the mixed solution sample from the dosing section 12, and fully and uniformly stirring by using a stirrer to ensure that the mineralization degree of the mixed solution sample reaches 50000 mg/L.

(4) The mixed liquid sample is conveyed by the mixing and conveying pump 6, fully mixed for a plurality of times by the phase mixer 10, and observed and recorded the output current signal value of the water content instrument 30 after the internal circulation in the internal circulation pipeline 19 is stable, so as to obtain a data point on the water content curve.

(5) And (3) repeating the steps (1) to (4), changing the water content of the mixed solution by increasing the oil or water flow, and correspondingly increasing the gas flow and the salt adding amount to ensure that the gas content is 10%, the mineralization degree is 50000mg/L, the temperature is 15 ℃ and the pressure is 0.8 MPa. From the water content of 0 to the water content of 100%, sequentially proportioning 21 mixed samples with different water contents by taking 5% as a step length, and recording output current signal values corresponding to the water contents and the water content instrument 30 for 21 groups of data.

(6) Opening the exhaust valve 14 to exhaust the gas in the internal circulation pipeline 19; and opening the valve 7 and closing the valve 6 to enable the oil-water mixed liquid to enter the oil-water separator 1 for separation for the next calibration experiment.

(7) And drawing a water content curve of the water content analyzer applicable to the tableland XX-XX wells according to the obtained 21 groups of data.

The model specification of each device in the invention has no special requirement, the function can be satisfied, the model specification can be changed according to the self condition of different oil fields, and the following model selection is made according to the economic principle in consideration of the field environment and the working condition of the oil well wellhead; the oil-water separator 1 adopts a gravity type oil-water separator; the air pump 2, the water pump 5 and the oil pump 4 adopt one of a turbine pump, a vane pump, a piston pump, a plunger pump, a film pump and a screw pump; the filter 3 adopts a Y-shaped filter; the mixing and conveying pump 6 adopts a screw pump; the oil flowmeter 7, the water flowmeter 8 and the gas flowmeter 9 are volume flowmeters, and adopt one of a differential pressure flowmeter, a rotor flowmeter, an electromagnetic flowmeter, a turbine flowmeter and an ultrasonic flowmeter; the phase mixer 10 adopts a tubular static phase mixer; the pressure test pump 11 adopts an electric pressure test pump; the temperature sensor 15 is a thermistor type temperature sensor; the pressure sensor 16 outputs a pressure sensor by adopting a 4-20mA analog signal; the PLC module 17 adopts S7-200 series PLC. The connecting pipelines between the devices of the system use stainless steel pipe sections with the outer diameter of 1 inch and the pressure of 4 MPa.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.