CN115853468A - Working method of intelligent plunger system for detecting accumulated liquid - Google Patents
Working method of intelligent plunger system for detecting accumulated liquid Download PDFInfo
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Abstract
The invention provides a working method of an intelligent plunger system for detecting accumulated liquid, which comprises the following steps: s1: arranging a plunger in a sealed, high-pressure and all-metal oil pipe, wherein the plunger can move up and down from a well bottom to a wellhead lubricator by means of formation pressure; s2: the temperature, pressure and acceleration information in the oil pipe are acquired through a measuring unit arranged in the plunger, and the running state of the plunger is identified through an MCU. The invention combines the advantages of the prior sensor technology, can sense the acceleration change of the movement of the plunger, adds the functions of measuring pressure and temperature on the basis of the original drainage function of the plunger, and intelligently identifies the running state of the plunger in a shaft; whether the plunger moves to the position of the blowout prevention pipe or not is identified, when the plunger identifies that the plunger moves to the position of the blowout prevention pipe, the measurement data is transmitted out through wireless communication, and wireless data transmission is carried out in the all-metal sealed shaft.
Description
Technical Field
The invention belongs to the technical field of intelligent plunger systems, and relates to a working method of an intelligent plunger system for detecting accumulated liquid.
Background
The plunger gas lift water drainage gas production is a production process used in natural gas exploitation, and utilizes the self energy of a gas well to push a plunger in an oil pipe so as to discharge water from the gas well. No need of other power equipment and low production cost. The existing plug acts as a solid sealing interface, separating the lift gas from the liquid being lifted, reducing gas cross-flow and liquid drop-back, providing a means of gas lift efficiency. The method has no measurement function of the well condition parameters of the gas well.
In the current natural gas exploitation, a plunger gas lift drainage gas recovery process only has a drainage gas recovery function. Gas well conditions cannot be monitored in real time. When the well condition changes, the gas production unit can not quickly discover and quickly deal with the problem, the existing means of the gas production unit is usually that a special instrument is periodically used for manual measurement, or when the gas well has a problem and can not continue to work by a plunger gas lift, the operation of the plunger of the gas well needs to be closed no matter which measurement mode is adopted, the yield of the gas well is influenced, a large amount of labor and equipment need to be invested, the gas production cost is high, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a working method of an intelligent plunger system for detecting accumulated liquid, which aims to solve the problems that the gas well yield is influenced, a large amount of labor and equipment are required to be invested, the gas production cost is high, and the efficiency is low in the conventional method for performing remedial measurement when the gas well has problems and cannot continue to work under the condition of plunger gas lift in any measurement mode.
The purpose of the invention can be realized by the following technical scheme: a working method of an intelligent plunger system for detecting accumulated liquid comprises the following steps:
s1: arranging a plunger in a sealed, high-pressure and all-metal oil pipe, wherein the plunger can move up and down from a well bottom to a wellhead lubricator by means of formation pressure;
s2: acquiring temperature, pressure and acceleration information in an oil pipe through a measuring unit arranged in the plunger, and identifying the running state of the plunger through an MCU (micro control unit);
s3: and when the MCU microcontroller identifies that the plunger moves to the position of the wellhead lubricator, the acquired measurement data is transmitted through the wireless communication unit.
In the above working method of the intelligent plunger system for detecting accumulated liquid, the information of temperature, pressure and acceleration in the collection pipe of step S2 is specifically:
when the plunger is positioned in the blowout prevention pipe at the well mouth, stopping temperature measurement, wherein the pressure measurement interval time is 5 seconds, and the pressure measurement interval time is used for detecting and identifying the downward state conversion of the plunger;
when the plunger is in an ascending state, the walking speed of the plunger is 200-300 m/min, and the measurement interval time is set to 10 seconds, namely, the temperature and pressure gradient change is measured every 30-50 m;
when the plunger is in a descending state, the walking speed of the plunger is 30-40 m/min, the measurement interval time is 1 min, and the temperature and pressure gradient change is measured every 30-40 m;
when the bottom hole is in a static state, the measurement interval time is set to 20 minutes, and the formation pressure recovery speed is recorded.
In the above working method of the intelligent plunger system for detecting liquid loading, the signal conversion by the MCU microcontroller in step S2 is specifically that the conversion accuracy ADCbit is determined according to the minimum resolution of the analog-to-digital conversion reference voltage and the converted signal as follows:
wherein, V ref Is a reference voltage, V sen Is the minimum resolution to be converted.
In the working method of the intelligent plunger system for detecting accumulated liquid, the operation state of the plunger identified in the step S2 is specifically a plunger wellhead state, a plunger descending state, a plunger shaft bottom static state and a plunger ascending state.
In the working method of the intelligent plunger system for detecting accumulated liquid, the state that the plunger reaches the wellhead specifically comprises the following steps: and the change of the acceleration information exceeds a threshold value of +/-0.6 g within 0.5s, namely the plunger is determined to reach the wellhead state.
In the above working method of the intelligent plunger system for detecting accumulated liquid, the identification of the descending state of the plunger is specifically as follows: when the pressure rises by at least 3MPa within 10 seconds and changes by 2MPa within 10 seconds as a threshold value, the starting moment of the descending state is determined.
In the above working method of the intelligent plunger system for detecting accumulated liquid, the identification of the stationary state of the bottom of the plunger specifically comprises: identifying a bottom-hole static state according to the temperature and acceleration information, and confirming that the plunger is in the bottom-hole static state after the following two conditions are met;
sampling temperature data at fixed time, judging the temperature change condition, and confirming that the plunger finishes the descending state after the temperature is detected not to be increased so as to meet the first condition of the bottom hole static state;
when the plunger is in a static state, measuring an effective acceleration value X when the plunger is in the static state rmsB As standard data, when the plunger works, the effective value X of the acceleration when the plunger moves is compared rmsN And X rmsB When X is present rmsN Greater than X rmsB When the ratio is 50%, the condition is satisfied; and when the condition of continuous 10s is met, the plunger is confirmed to be in a static state, and the condition II is met.
In the working method of the intelligent plunger system for detecting accumulated liquid, the identification of the plunger ascending state specifically comprises the following steps: while the plunger is at the bottom of the well in a static state
Calculating acceleration measurement data, X, in real time rmsN Is the effective value of the acceleration of the plunger during movement, X rm Is effective value of the acceleration at rest of the plunger when->
And when the condition continuously exceeds 10s, confirming that the plunger is changed from the bottom-hole static state to the ascending state.
The intelligent plunger system for detecting the accumulated liquid comprises a measuring unit, an analog-to-digital converter, an MCU (micro control unit), a data memory, a wireless communication unit and a power supply,
a measurement unit: the temperature sensor is used for acquiring temperature, pressure and acceleration information in the oil pipe, the temperature in the oil pipe is acquired by the temperature sensor, when the temperature sensor changes between 0 and 100 ℃, the voltage correspondingly entering the analog-to-digital converter end is 0.45 to 0.60V, namely the dynamic change range of the voltage is 0.15V. When the temperature measurement precision is required to reach 0.1 ℃, the resolution of the analog-to-digital converter is required to be more than 0.15V/1000=0.0015V. The resolution of the current analog-to-digital conversion is 0.0004V, which is 3.75 times of the theoretical requirement. Then considering the influence of noise and conversion error, the requirement of temperature measurement on the analog-to-digital conversion precision is basically met;
an analog-to-digital converter: for converting temperature, pressure and acceleration information in oil pipe
The MCU microcontroller: the temperature, pressure and acceleration information after conversion is processed, and the running state of the plunger is analyzed;
a data memory: the device is used for storing temperature, pressure and acceleration information data and plunger operating state data information analyzed by the MCU;
the wireless communication unit: for transmitting data;
power supply: for providing electrical energy.
In the working method of the intelligent plunger system for detecting accumulated liquid, the measuring unit comprises a temperature sensor, a pressure sensor and an MEMS acceleration sensor, the temperature sensor, the pressure sensor and the MEMS acceleration sensor are respectively connected with the MCU through an analog-to-digital converter, and the analog-to-digital converter is 24-bit in channel precision.
And (3) parameter measurement: measuring by adopting interval time, on the basis of meeting the measurement requirement, increasing the interval time as much as possible to reduce the power consumption, and according to experimental data, when the sampling interval is set to be 1 minute in the descending process of the plunger, the pressure gradient change range is between 0.004 and 0.01 Mpa; because 1Mpa corresponds to the height of 100 meters of water column, the pressure gradient can be calculated within 1 minute, and the plunger moves 0.4-1.0 meter in water. I.e. the liquid level position is checked, the liquid level accuracy is less than 1.0 meter, usually the well depth is more than 2000 meters, i.e. the liquid level measurement accuracy is >0.05% (1 meter/2000 meter x 100% = 0.05%).
Further: in the identification of the descending state of the plunger, the temperature and pressure measurement is started, and the measurement interval time is adjusted to 1 minute, so that the power consumption is saved;
the plunger is in the recognition of the bottom hole static state, the interval time of temperature and pressure measurement is adjusted to 20 minutes, and the power consumption is saved;
in the identification of the plunger ascending state, the time interval between the temperature measurement and the pressure measurement is adjusted to 10 seconds, so that the power consumption is further saved.
Compared with the prior art, the working method of the intelligent plunger system for detecting the accumulated liquid has the advantages that: the advantages of the existing sensor technology are combined, the acceleration change of the movement of the plunger can be sensed, the plunger is added with the functions of measuring pressure and temperature on the basis of the original water drainage function, and the running state of the plunger in a shaft is intelligently identified; whether the plunger moves to the position of the blowout prevention pipe or not is identified, when the plunger identifies that the plunger moves to the position of the blowout prevention pipe, the measurement data is transmitted out through wireless communication, and wireless data transmission is carried out in the all-metal sealed shaft.
Drawings
FIG. 1 is a block flow diagram of a method of operation of an intelligent plunger system for effusion detection in accordance with the present invention;
FIG. 2 is a system block diagram of an intelligent plunger system for effusion detection in accordance with the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Please refer to FIG. 1
A working method of an intelligent plunger system for detecting accumulated liquid comprises the following steps:
s1: arranging a plunger in a sealed, high-pressure and all-metal oil pipe, wherein the plunger can move up and down from a well bottom to a wellhead lubricator by means of formation pressure;
s2: acquiring temperature, pressure and acceleration information in an oil pipe through a measuring unit arranged in the plunger, and identifying the running state of the plunger through an MCU (micro control unit);
s3: when the MCU microcontroller identifies that the plunger moves to the position of the wellhead blowout prevention pipe, the acquired measurement data are sent through the wireless communication unit.
The step S2 of collecting the temperature, pressure and acceleration information in the pipe is specifically as follows:
when the plunger is positioned in the wellhead lubricator, stopping temperature measurement, and measuring the pressure at 5 seconds intervals for detecting and identifying the downward state conversion of the plunger;
when the plunger is in an ascending state, the walking speed of the plunger is 200-300 m/min, and the measurement interval time is set to 10 seconds, namely the temperature and pressure gradient change is measured every 30-50 m;
when the plunger is in a descending state, the walking speed of the plunger is 30-40 m/min, the measurement interval time is 1 min, and the temperature and pressure gradient change is measured every 30-40 m;
when the bottom hole is in a static state, the measurement interval time is set to 20 minutes, and the formation pressure recovery speed is recorded.
The signal conversion by the MCU microcontroller in step S2 is specifically that the conversion accuracy ADCbit is determined according to the analog-to-digital conversion reference voltage and the minimum resolution of the converted signal as follows:
wherein, V ref Is a reference voltage, V sen Is the minimum resolution to be converted.
And S2, identifying the running state of the plunger, namely the wellhead state of the plunger, the descending state of the plunger, the bottom-hole static state of the plunger and the ascending state of the plunger.
The state that the plunger reaches the wellhead is specifically as follows: and the change of the acceleration information exceeds a threshold value of +/-0.6 g within 0.5s, namely the plunger is determined to reach the wellhead state.
The identification of the descending state of the plunger piston is specifically as follows: when the pressure rises by at least 3MPa within 10 seconds and changes by 2MPa within 10 seconds as a threshold value, the starting moment of the descending state is determined.
The identification of the static state of the bottom of the plunger well specifically comprises the following steps: identifying the bottom hole static state according to the temperature and acceleration information, and confirming that the plunger is in the bottom hole static state after the following two conditions are met;
sampling temperature data at regular time, judging the temperature change condition, and confirming that the plunger finishes the descending state after the temperature is detected not to be increased so as to meet the first condition of the bottom hole static state;
when the plunger is in a static state, measuring an effective acceleration value X when the plunger is in the static state rmsB As standard data, when the plunger is working, the effective value X of the acceleration when the plunger is moving is compared rmsN And X rmsB When X is present rmsN Greater than X rmsB When 50%, the condition is true; and when the condition of continuous 10s is met, the plunger is confirmed to be in a static state, and the condition II is met.
The plunger ascending state identification specifically comprises the following steps: while the plunger is at the bottom of the well in a static state
Calculating acceleration measurement data, X, in real time rmsN Is the effective value of the acceleration of the plunger during movement, X rmsB Effective value of the acceleration at rest of the plunger, when->
And when the conditions continuously exceed 10s, confirming that the plunger is changed into an ascending state from a bottom hole static state.
In the identification of the descending state of the plunger, the temperature and pressure measurement is started, and the measurement interval time is adjusted to 1 minute, so that the power consumption is saved;
the plunger is in the recognition of the bottom hole static state, the interval time of temperature and pressure measurement is adjusted to 20 minutes, and the power consumption is saved;
in the identification of the plunger ascending state, the time interval between the temperature measurement and the pressure measurement is adjusted to 10 seconds, so that the power consumption is further saved.
The temperature, pressure acquisition frequency and data transmission of plunger are decided by the running state of plunger, and running state discernment is more important, specifically:
and (3) identifying the state of the wellhead:
the plunger moves towards the wellhead under the pushing of the pressure difference between the bottom and the wellhead, and has a high speed when running to the wellhead lubricator; moreover, because the top end of the lubricator is provided with an anti-impact spring device, the plunger can generate a plurality of continuous impact actions at the spring position; the acceleration sensor can continuously generate positive and negative large measurement values for multiple times.
The running speed of the plunger is 3.3-5m/s, the single impact time of the plunger and the spring is actually measured to be less than 0.5s, and the relation between the speed and the acceleration is as follows:
a＝Δv/Δt
the acceleration upon impact is 6.6-10m/s2, resulting in an acceleration value of 0.67-1.02 g.
The MCU micro-controller searches for a threshold value of which the variation of the acceleration within 0.5s exceeds +/-0.6 g by analyzing the output data of the acceleration sensor in real time, namely, the condition that the plunger reaches the wellhead is determined.
Downlink state identification:
after the well is closed, the plunger slowly slides to the bottom of the well under the action of gravity; before shutting down the well, because the natural gas is in a state of being output to a gas transmission pipeline, the pressure at the well head is lower, usually lower than 3Mpa, and the pressure at the well bottom is higher than 10 Mpa; after the well is shut down, the natural gas is not output outwards any more, and the pressure in the well shaft can rise quickly in a short time; through actual measurement, the pressure rises by at least 3MPa within 10 seconds, and the change of 2MPa within 10 seconds is taken as a threshold value, so that the starting time of the descending state can be accurately identified.
Identifying a bottom hole static state:
the analysis needs to be performed through the measurement data of the temperature sensor and the acceleration sensor, specifically:
analysis of temperature sensor measurement data:
when the plunger plug descends, the deeper the depth is, the higher the temperature is due to the temperature gradient of the stratum; the temperature data measured by the plunger piston can slowly rise along with the descending of the plunger piston; when the plunger reaches the bottom of the well, the temperature stops rising and keeps stable; the temperature change condition is judged by sampling temperature data at regular time, and when the temperature is detected not to be increased, the plunger is confirmed to finish the descending state, and the condition I of the bottom hole static state is met;
analysis of the measurement data of the acceleration sensor:
judging the bottom hole running state by calculating the effective value amplitude of the acceleration; when the plunger piston descends, because the plunger piston can have friction and collision with a shaft, the acceleration on two horizontal shafts can have obvious fluctuation when the plunger piston descends; analyzing the fluctuation of the acceleration at a single point can not accurately distinguish whether the plunger moves downwards or is in a static state, analyzing data by using an effective value algorithm, and determining X rms Comprises the following steps:
each effective value is calculated by using 128 sampling values to obtain an effective value X rmsN 。
Before the plunger is factory-installed, firstly, when the plunger is in a static state, an effective value X of the plunger in the static state is measured rmsB The results are saved in the plunger's FLASH memory as standard data.
When the plunger works, the motion state of the plunger is identified through the following judgment conditions, specifically:
comparison of X rmsN And X rmsB When X is present rmsN Greater than X rmsB When 50%, the condition is true; and when the condition of continuous 10s is met, the plunger is confirmed to be in a static state, and the condition II is met.
And after the MCU is subjected to data analysis and calculation and meets the two conditions, the plunger is confirmed to be in a bottom-hole static state.
And (3) uplink state identification: while the plunger is at the bottom of the well in a static state
Calculating acceleration measurement data in real time when->
And when the condition continuously exceeds 10s, confirming that the plunger is changed from the bottom-hole static state to the ascending state.
Please refer to fig. 2, an intelligent plunger system for detecting accumulated liquid
Comprises a measuring unit, an analog-digital converter, an MCU microcontroller, a data memory, a wireless communication unit and a power supply,
a measurement unit: the device is used for acquiring temperature, pressure and acceleration information in the oil pipe;
an analog-to-digital converter: for converting temperature, pressure and acceleration information in oil pipe
The MCU microcontroller: the device is used for processing the converted temperature, pressure and acceleration information and analyzing the running state of the plunger;
a data memory: the MCU is used for storing temperature, pressure and acceleration information data and plunger operating state data information analyzed by the MCU;
the wireless communication unit: for transmitting data;
power supply: for providing electrical energy.
The measuring unit comprises a temperature sensor, a pressure sensor and an MEMS acceleration sensor, wherein the temperature sensor, the pressure sensor and the MEMS acceleration sensor are respectively connected with the MCU through an analog-to-digital converter, and the analog-to-digital converter is 24-bit in channel precision.
The power supply part supplies energy for the other parts of the intelligent plunger to work; the temperature sensor and the pressure sensor are responsible for measuring the temperature and pressure parameters of the gas well; the acceleration sensor is responsible for identifying the running state of the intelligent plunger; the MCU is responsible for sensor data acquisition, motion state identification, power supply management and wireless communication; the wireless communication unit is responsible for encoding and decoding of wireless data receiving and transmitting; the data memory is used for temporarily storing the measurement data of the sensor and storing the operating parameters of the plunger. The whole plunger structure is simple to set, the underground requirements are met by the functions, the exploitation cost of the gas well is effectively reduced, and data transmission is reliable. The device is arranged in a sealed, high-pressure and all-metal oil pipe, can move up and down from a well bottom to a wellhead blowout prevention pipe depending on formation pressure, and is used for measuring data and sending the measured data in a wireless transmission mode; the device comprises an MCU microcontroller, a data memory, a wireless communication unit, a power supply and a measuring unit.
The measuring unit is used for acquiring temperature, pressure and acceleration information in the oil pipe; the MCU is used for processing the acquired temperature, pressure and acceleration information and analyzing the running state of the plunger; the MCU microcontroller and the measuring unit are communicated and data are transmitted through the analog-to-digital converter; the data memory is used for storing temperature, pressure and acceleration information data and plunger operating state data information analyzed by the MCU; the wireless communication unit is used for sending analyzed plunger operation state data information; the power supply is used for supplying electric energy to the whole plunger system.
The measuring unit comprises a temperature sensor, a pressure sensor and an MEMS acceleration sensor, the temperature sensor, the pressure sensor and the MEMS acceleration sensor are respectively connected with the MCU through the analog-to-digital converter, the MCU is used for resolving data of the MEMS acceleration sensor so as to resolve the running state of the plunger, and the MCU is connected with the data storage and can be used for storing acquired sensor signal data and resolved data information into the data storage; and when the MCU microcontroller identifies that the plunger system moves to the position of the wellhead blowout preventer, the measurement data stored in the data memory is sent through the wireless communication unit.
The technical index requirements of the temperature sensor are as follows:
the temperature coefficient TCR =3850ppm/K, the temperature range is-50 ℃ to 300 ℃, the long-term stability R0 drift is less than or equal to 0.04%, the self-heating coefficient is less than or equal to 0.4K/mW (at 0 ℃), the response time in water is less than 0.1S, and the response time in air is less than 5S.
The technical index requirements of the pressure sensor are as follows:
the measurement range is 0-35MPa, the ambient temperature is-10-100 ℃, the medium temperature is-20-120 ℃, the temperature influence quantity is +/-0.04%/10K, the accuracy grade is 0.1, and the long-term drift is less than or equal to 0.1%/3 years.
The technical index requirements of the acceleration sensor are as follows:
the power supply voltage is 2.0-3.6V, the SPI or I2C digital interface, the temperature range is-40-85 ℃, the impact resistance is greater than 1000g, the measurement range is not less than +/-4 g, the measurement resolution is greater than 4mg/LSB, and the measurement current is less than 25uA.
The interval time of parameter measurement is specifically as follows:
when the plunger is positioned in the blowout prevention pipe at the well mouth, stopping temperature measurement, wherein the pressure measurement interval time is 5 seconds, and the pressure measurement interval time is used for detecting and identifying the downward state conversion of the plunger;
when the plunger is in an ascending state, the walking speed of the plunger is 200-300 m/min, and the measurement interval time is set to 10 seconds, namely the temperature and pressure gradient change is measured every 30-50 m;
when the plunger is in a descending state, the walking speed of the plunger is 30-40 m/min, the measurement interval time is 1 min, namely the temperature and pressure gradient change is measured every 30-40 m;
when the bottom hole is in a static state, the pressure of the stratum is slowly recovered, the measurement interval time is set to be 20 minutes, and the stratum pressure recovery speed is recorded.
Sampling of the analog-to-digital converter plays a crucial role in data processing, signals at the same time need to be simultaneously acquired by multiple channels to be accurately resolved, and meanwhile, the converted data bits, noise and the like of the digital part of the analog-to-digital converter have requirements.
The conversion accuracy ADCbi is related to the reference voltage of the analog-to-digital converter and the minimum resolution of the converted signal, specifically:
wherein, V ref Is a reference voltage, V sen Is the minimum resolution to be converted.
The reference voltage is 2.5V, the minimum resolution is 0.0004V, and the ADCbit is minimum 15 bits according to the calculation conversion precision, that is, the least significant bit of the analog-to-digital converter is 15 bits, if there is a certain error in the analog-to-digital converter, the bit number of the analog-to-digital converter should be larger than 15 bits. In combination with practical use cases, the invention selects a 6-channel 16-bit precision analog-to-digital converter.
Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The working method of the intelligent plunger system for detecting the accumulated liquid is characterized by comprising the following steps of:
s1: arranging a plunger in a sealed, high-pressure and all-metal oil pipe, wherein the plunger can move up and down from a well bottom to a wellhead lubricator by means of formation pressure;
s2: acquiring temperature, pressure and acceleration information in an oil pipe through a measuring unit arranged in the plunger, and identifying the running state of the plunger through an MCU (micro control unit);
s3: when the MCU microcontroller identifies that the plunger moves to the position of the wellhead blowout prevention pipe, the acquired measurement data are sent through the wireless communication unit.
2. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 1, wherein the information of the temperature, the pressure and the acceleration in the collection pipe in the step S2 is specifically as follows:
when the plunger is positioned in the wellhead lubricator, stopping temperature measurement, and measuring the pressure at 5 seconds intervals for detecting and identifying the downward state conversion of the plunger;
when the plunger is in an ascending state, the walking speed of the plunger is 200-300 m/min, and the measurement interval time is set to 10 seconds, namely the temperature and pressure gradient change is measured every 30-50 m;
when the plunger is in a descending state, the walking speed of the plunger is 30-40 m/min, the measurement interval time is 1 min, and the temperature and pressure gradient change is measured every 30-40 m;
when the bottom hole is in a static state, the measurement interval time is set to 20 minutes, and the formation pressure recovery speed is recorded.
3. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 1, wherein the signal conversion by the MCU microcontroller in the step S2 is specifically that the conversion accuracy ADCbit is determined according to the analog-to-digital conversion reference voltage and the minimum resolution of the converted signal as follows:
wherein, V ref Is a reference voltage, V sen Is the minimum resolution to be converted.
4. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 1, wherein the operation state of the plunger identified in the step S2 is specifically a plunger wellhead state, a plunger descending state, a plunger bottom-hole static state and a plunger ascending state.
5. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 4, wherein the state that the plunger reaches the wellhead specifically comprises: and the change of the acceleration information exceeds a threshold value of +/-0.6 g within 0.5s, namely the plunger is determined to reach the wellhead state.
6. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 4, wherein the identification of the descending state of the plunger is specifically as follows: when the pressure rises by at least 3MPa within 10 seconds and changes by 2MPa within 10 seconds as a threshold value, the starting moment of the descending state is determined.
7. The working method of the intelligent plunger system for detecting accumulated liquid as claimed in claim 4, wherein the identification of the stationary state of the plunger bottom hole is specifically as follows: identifying a bottom-hole static state according to the temperature and acceleration information, and confirming that the plunger is in the bottom-hole static state after the following two conditions are met;
sampling temperature data at regular time, judging the temperature change condition, and confirming that the plunger finishes the descending state after the temperature is detected not to be increased so as to meet the first condition of the bottom hole static state;
when the plunger is in a static state, measuring an effective acceleration value X when the plunger is in the static state rmsB As standard data, when the plunger works, the effective value X of the acceleration when the plunger moves is compared rmsN And X rmsB When X is present rmsN Greater than X rmsB When 50%, the condition is true; and when the condition of continuous 10s is met, the plunger is confirmed to be in a static state, and the condition II is met.
8. The working method of the intelligent plunger system for detecting accumulated liquid according to claim 4, wherein the identification of the plunger ascending state specifically comprises: while the plunger is at a standstill downhole
Calculating acceleration measurement data, X, in real time rmsN Is the effective value of the acceleration of the plunger during movement, X rmsB Is the effective value of the acceleration when the plunger is at rest
And when the conditions continuously exceed 10s, confirming that the plunger is changed into an ascending state from a bottom hole static state.
9. An intelligent plunger system for detecting accumulated liquid, which is applied to the working method of the intelligent plunger system for detecting accumulated liquid according to any one of claims 1 to 8,
comprises a measuring unit, an analog-to-digital converter, an MCU microcontroller, a data memory, a wireless communication unit and a power supply,
a measurement unit: the device is used for acquiring temperature, pressure and acceleration information in the oil pipe;
an analog-to-digital converter: for converting temperature, pressure and acceleration information in oil pipe
The MCU microcontroller: the device is used for processing the converted temperature, pressure and acceleration information and analyzing the running state of the plunger;
a data memory: the device is used for storing temperature, pressure and acceleration information data and plunger operating state data information analyzed by the MCU;
the wireless communication unit: for transmitting data;
power supply: for providing electrical energy.
10. The intelligent plunger system for detecting accumulated liquid according to claim 9, wherein the measuring unit comprises a temperature sensor, a pressure sensor and an MEMS acceleration sensor, the temperature sensor, the pressure sensor and the MEMS acceleration sensor are respectively connected with the MCU through an analog-to-digital converter, and the analog-to-digital converter has 24-bit precision.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117027767A (en) * | 2023-06-12 | 2023-11-10 | 中国石油工程建设有限公司 | Liquid level on-line monitoring method and plunger for monitoring |
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