CN114113464B - Online testing device and method for wet steam dryness of steam transmission pipeline - Google Patents
Online testing device and method for wet steam dryness of steam transmission pipeline Download PDFInfo
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- CN114113464B CN114113464B CN202010876349.7A CN202010876349A CN114113464B CN 114113464 B CN114113464 B CN 114113464B CN 202010876349 A CN202010876349 A CN 202010876349A CN 114113464 B CN114113464 B CN 114113464B
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Abstract
The invention discloses an online testing device and method for wet steam dryness of a steam transmission pipeline, wherein the device comprises the following components: a heat preservation layer; a temperature measuring optical fiber; the temperature measuring optical fiber comprises a plurality of optical fiber temperature measuring points for measuring a plurality of temperature data of different positions of the pipeline along the length direction; the temperature and pressure integrated sensor obtains the temperature and pressure of a medium in the pipeline; the environmental temperature and wind speed integrated sensor acquires the temperature and wind speed of the environment; the optical fiber demodulator acquires a plurality of temperature data measured by a plurality of optical fiber temperature measuring points by utilizing a Raman reflection principle; the data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be tested according to the temperature and pressure of the medium in the pipeline, the temperature and wind speed of the environment, a plurality of temperature data of the steam transmission pipeline and the wet steam dryness test model. The method can acquire the along-path wet steam dryness data of the steam conveying pipeline, so that the real-time change condition of the along-path wet steam dryness of the steam conveying pipeline can be known, further the steam injection effect can be accurately analyzed and mastered, and the thermal recovery efficiency is improved.
Description
Technical Field
The invention relates to the technical field of multiphase flow testing, in particular to an online wet steam dryness testing device and method for a steam transmission pipeline.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Liaohe oil field is the biggest viscous crude production base in our country, and Liaohe oil field mainly uses development modes such as steam huff and puff, steam flooding and Steam Assisted Gravity Drainage (SAGD), in the development process, in order to reasonably adjust steam injection parameters, dryness parameters need to be measured in the steam production and injection processes so as to accurately analyze and master the steam injection effect and improve the thermal recovery efficiency.
In the aspect of wet steam dryness measurement, the existing oilfield on-site steam dryness test still adopts a plurality of methods of manual sampling and testing, and the test result cannot truly and continuously reflect the steam dryness parameters of the steam transmission pipeline along the whole production process because the on-line test cannot be performed in real time.
Disclosure of Invention
The embodiment of the invention provides an on-line testing device for the dryness of wet steam of a steam transmission pipeline, which is used for acquiring the dryness data of the wet steam along the steam transmission pipeline, and comprises the following components:
The heat preservation layer is arranged on the steam transmission pipeline to be tested;
the temperature measuring optical fiber is arranged outside the heat preservation layer; the temperature measuring optical fiber comprises a plurality of optical fiber temperature measuring points which are arranged at different positions along the length direction of the steam conveying pipeline, and the plurality of optical fiber temperature measuring points are used for measuring a plurality of temperature data of the steam conveying pipeline at different positions along the length direction;
the temperature and pressure integrated sensor is arranged on the steam transmission pipeline to be detected and is used for acquiring temperature data and pressure data of a medium in the steam transmission pipeline;
the environment temperature and wind speed integrated sensor is used for acquiring temperature data and wind speed data of the environment;
The optical fiber demodulator is connected with the temperature measuring optical fiber and is used for transmitting a preset wavelength spectrum to the temperature measuring optical fiber, and a plurality of temperature data at different positions along the length direction of the steam transmission pipeline are obtained by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
the data acquisition control system is connected with the temperature and pressure integrated sensor, the ambient temperature and wind speed integrated sensor and the optical fiber demodulator and is used for obtaining a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model.
The embodiment of the invention also provides an online test method for the wet steam dryness of the steam transmission pipeline, which is used for acquiring the along-path wet steam dryness data of the steam transmission pipeline, and comprises the following steps:
The plurality of optical fiber temperature measuring points measure a plurality of temperature data of different positions of the steam conveying pipeline along the length direction; the plurality of optical fiber temperature measuring points are arranged on the temperature measuring optical fibers at different positions along the length direction of the steam conveying pipeline; the temperature measuring optical fiber is arranged outside the heat preservation layer, and the heat preservation layer is arranged on the steam transmission pipeline to be measured;
The temperature and pressure integrated sensor acquires temperature data and pressure data of a medium in the steam transmission pipeline;
the method comprises the steps that an ambient temperature and wind speed integrated sensor obtains ambient temperature data and wind speed data;
The optical fiber demodulator transmits a preset wavelength spectrum to the temperature measuring optical fiber, and acquires a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
The data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the online testing method of the wet steam dryness of the steam transmission pipeline when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium which stores a computer program for executing the online testing method for the wet steam dryness of the steam transmission pipeline.
In the embodiment of the invention, compared with the technical scheme that the wet steam dryness of the steam transmission pipeline cannot be tested on line in real time in the prior art, the test result cannot truly and continuously reflect the steam dryness parameter along the steam transmission pipeline in the whole production process, the method has the advantages that: the plurality of optical fiber temperature measuring points measure a plurality of temperature data of different positions of the steam conveying pipeline along the length direction; the plurality of optical fiber temperature measuring points are arranged on the temperature measuring optical fibers at different positions along the length direction of the steam transmission pipeline; the temperature measuring optical fiber is arranged outside the heat preservation layer, and the heat preservation layer is arranged on the steam transmission pipeline to be measured; the temperature and pressure integrated sensor acquires temperature data and pressure data of a medium in the steam transmission pipeline; the method comprises the steps that an ambient temperature and wind speed integrated sensor obtains ambient temperature data and wind speed data; the optical fiber demodulator transmits a preset wavelength spectrum to the temperature measuring optical fiber, and acquires a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber; the data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model, namely, along-path wet steam dryness data of the steam transmission pipeline can be obtained, so that real-time change conditions of along-path wet steam dryness of the steam transmission pipeline can be known, further, the steam injection effect can be accurately analyzed and mastered, and the thermal recovery efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a device for testing the dryness of wet steam in a steam transmission pipeline on line in an embodiment of the invention;
FIG. 2 is a schematic diagram of a data acquisition control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a data acquisition control system according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for online testing the dryness of wet steam in a steam transmission pipeline according to an embodiment of the invention;
FIG. 5 is a schematic flow chart of a method for online testing of dryness of wet steam in a steam delivery pipeline according to another embodiment of the present invention;
Reference numerals: 1-a steam transmission pipeline; 2-an insulating layer; 3-an optical fiber temperature measuring point; 4-temperature measuring optical fiber; 5-protecting layer; 6-a temperature and pressure integrated sensor; 7-an ambient temperature and wind speed integrated sensor; 8-a data acquisition control system; a 9-fiber demodulator; 91-a receiving unit; 92-dryness determining unit; 93-a heat preservation effect determining unit; 10-fiber pigtail.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
The inventors found that: at present, the online test of the dryness of the wet steam of the steam transmission pipeline mainly uses methods such as electricity, optics, thermodynamics and the like, and the methods have the following defects:
1. In the electrical method, the oil field commonly uses a steam-water separator to measure the two-phase flow of steam-water respectively, and then calculates the dryness of steam; some online test instruments capable of simultaneously measuring the dryness and the flow of the wet steam are adopted, and some methods utilize the orifice plate differential pressure noise measurement principle, so that the test instruments are convenient to install, but because of complex field working conditions, the two-phase flow state change interval is large, and larger test errors exist. Other methods are combined testing methods using conventional flow meters and density meters.
2. In the thermodynamic method, some methods utilize an electric heater to heat a wet steam sample body entering a cylinder heating cavity, heat the wet steam sample body into superheated steam, and utilize the law of mass conservation and the thermophysical properties of the water steam, and realize the online measurement of the dryness of the wet steam by combining temperature and pressure test parameters and a water steam state equation.
3. In the optical methods, a plurality of methods relate to point-type dryness measuring devices of steam transmission pipelines, and the along-path dryness change of the steam transmission pipelines and the heat preservation effect of the pipelines cannot be diagnosed. In the aspect of pipeline detection, some methods realize direct monitoring of multiple measuring points of leaked steam, and provide higher sensitivity of main steam pipeline leakage monitoring; in some methods, the optical fiber sensing system adopts a single-mode optical fiber to form a distributed vibration sensor, the distributed optical fiber sensor is adopted to realize real-time monitoring and early warning along the pipeline, the time difference from the transmission of the system alarm signal to the signal acquisition is realized through the interference of the vibration signal to realize the positioning of the system, and the signals with different danger levels are classified. The pipeline detection adopts the vibration detection principle of optical fibers for detecting pipeline leakage, and the pipeline heat preservation effect detection and the online dryness test are not mentioned.
In addition, the steam conveying pipeline as a wet steam conveying carrier is required to be tested and evaluated regularly for heat preservation effect, so that basis is provided for improving steam injection quality and implementing energy-saving technical improvement. As can be seen from the above, the existing detection method cannot diagnose the heat preservation effect of the steam transmission pipeline.
In view of the above technical problems, the inventor provides an online testing scheme for the dryness of wet steam of a steam transmission pipeline, which is based on an optical fiber Raman scattering temperature measurement principle and combines a thermodynamic calculation method to obtain real-time data of the along-path heat loss of the steam transmission pipeline and the heat preservation condition of each node, and utilizes an energy conservation equation to obtain the along-path and real-time change condition of the dryness of wet saturated steam when the steam transmission pipeline is in the steam transmission pipeline, and can also be used as a detection method for the leakage of the steam transmission pipeline. The real-time data of the along-path heat loss of the steam transmission pipeline and the heat preservation condition of each node are obtained, the along-path and real-time change condition of the dryness of the wet saturated steam in the steam transmission pipeline is obtained, and the method can be used as a detection method of the leakage of the steam transmission pipeline.
In order to solve the technical problems, the technical scheme adopted by the embodiment of the invention is as follows: the technical scheme provided by the embodiment of the invention can also realize online detection of the dryness of the wet steam and the heat preservation effect, and mainly comprises a temperature measuring optical fiber, an optical fiber demodulator, a temperature and pressure integrated sensor, a temperature and wind speed integrated sensor, a data acquisition control system (comprising a data acquisition processing device and built-in data acquisition processing software) and the like.
The temperature and pressure of the wet steam in the pipeline are obtained by utilizing a temperature and pressure integrated sensor, the ambient temperature and the wind speed are obtained by utilizing a temperature and wind speed integrated sensor, the along-path temperature profile of the outer surface of the wet steam pipeline is obtained by utilizing a temperature measuring optical fiber, the test data are transmitted to a data acquisition control system through wires or wirelessly, a wet steam dryness and heat preservation effect evaluation calculation model (a wet steam dryness test model and a heat preservation effect test model) is installed in the data acquisition control system, different nodes of the steam pipeline can be obtained by the model according to related principles such as heat transfer science, mass conservation law, a gas state equation and the like (the node distance depends on the optical fiber temperature measuring interval (the interval between every 2 optical fiber temperature measuring points), the along-path heat loss and the wet steam dryness of 2 points/m can be realized by utilizing the optical fiber temperature measuring technology at present, meanwhile, the heat preservation effect and leakage state of different node positions can be evaluated, and the calculation model is detailed in the embodiment.
The steam transmission pipeline wet steam dryness online test scheme is described in detail below.
Fig. 1 is a schematic structural diagram of an online testing device for wet steam dryness of a steam transmission pipeline according to an embodiment of the present invention, as shown in fig. 1, the device includes:
the heat preservation layer 2 is arranged on the steam transmission pipeline 1 to be tested;
the temperature measuring optical fiber 4 is arranged outside the heat insulation layer; the temperature measuring optical fiber comprises a plurality of optical fiber temperature measuring points 3 which are arranged at different positions along the length direction of the steam conveying pipeline, and the plurality of optical fiber temperature measuring points are used for measuring a plurality of temperature data of the steam conveying pipeline at different positions along the length direction;
The temperature and pressure integrated sensor 6 is arranged on the steam transmission pipeline to be detected and is used for acquiring temperature data and pressure data of a medium in the steam transmission pipeline;
the environment temperature and wind speed integrated sensor 7 is used for acquiring temperature data and wind speed data of the environment;
the optical fiber demodulator 9 is connected with the temperature measuring optical fiber and is used for transmitting a preset wavelength spectrum to the temperature measuring optical fiber, and acquiring a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
The data acquisition control system 8 is connected with the temperature and pressure integrated sensor, the ambient temperature and wind speed integrated sensor and the optical fiber demodulator and is used for obtaining a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model.
In specific implementation, as shown in fig. 1, the technical scheme provided by the embodiment of the invention can realize an on-line detection device for the dryness of wet steam and the heat preservation effect of a pipeline, and the device mainly comprises: an insulation layer 2 outside the wet steam conveying pipeline 1, an optical fiber temperature measuring point 3, a temperature measuring optical fiber 4, a protective layer 5, a temperature and pressure integrated sensor 6, an environment temperature and wind speed integrated sensor 7, a data acquisition control system 8, an optical fiber demodulator 9, an optical fiber tail fiber 10 and the like.
In specific implementation, as shown in fig. 1, a temperature measuring optical fiber 4 is installed on a wet steam conveying pipeline 1, and continuous and positioning measurement of the along-path temperature of the conveying pipeline is realized according to the raman signal and optical time domain reflection principle of the optical fiber. The optical fiber temperature measuring point 3 can realize 2 points/m at present. During testing, the optical fiber demodulator 9 transmits a specific wavelength spectrum to the temperature measuring optical fiber 4 through the optical fiber tail fiber 10, and temperature data of different positions along the pipeline are obtained by utilizing the Raman scattering principle. The temperature and pressure integrated sensor 6 is arranged on the wet steam conveying pipeline 1 and acquires temperature and pressure data of a medium in the steam conveying pipeline in real time; the ambient temperature and wind speed integrated sensor 7 acquires the ambient temperature and wind speed in real time.
In specific implementation, temperature signal data obtained by the optical fiber demodulator 9, medium temperature and pressure data measured by the temperature and pressure integrated sensor 6, and environment temperature and wind speed data measured by the environment temperature and wind speed integrated sensor 7 are transmitted to the data acquisition control system 8 in a wireless or wired mode for centralized processing, and a wet steam dryness test model and a heat preservation effect test model (which are pre-established through a pipeline along-path heat loss calculation model, a steam thermal physical property and other calculation models) installed in the data acquisition control system 8 are calculated.
In specific implementation, the pressure data measured by the temperature and pressure integrated sensor 6 is input into the data acquisition control system 8, so as to determine the state of the steam in the steam delivery pipeline together with the temperature data, for example, whether the steam is wet steam.
In specific implementation, the embodiment of the invention also knows the real-time change condition of the steam transmission pipeline along the length of the steam transmission pipeline according to the multiple wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction, so that the steam injection effect can be accurately analyzed and mastered, and the thermal recovery efficiency is improved. Meanwhile, the leakage condition of the steam transmission pipeline can be determined through a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction.
In one embodiment, the data acquisition control system may be further configured to obtain thermal insulation effect data of the steam delivery pipe to be tested according to temperature data and pressure data of the medium in the steam delivery pipe, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam delivery pipe, and a pre-established thermal insulation effect test model.
In specific implementation, the scheme provided by the embodiment of the invention can also test the heat preservation effect of different node positions, and according to the effect and the leakage condition.
In one embodiment, the online wet steam dryness testing device for a steam delivery pipeline further comprises a model building unit, wherein the model building unit is used for building a wet steam dryness testing model according to the following method:
obtaining the along-path heat loss data of the steam transmission pipeline through the along-path heat loss model of the steam transmission pipeline;
Acquiring steam enthalpy values at all optical fiber temperature measuring points by using an energy conservation law model and along-path heat loss data of a steam transmission pipeline;
and establishing a wet steam dryness test model according to the steam thermal physical property model and the steam enthalpy value at each optical fiber temperature measuring point.
In the specific implementation, the along-path heat loss Q Heat of the body of the pipeline and the comprehensive heat transfer coefficient lambda' for judging the current situation of the heat preservation effect can be obtained through calculation of the pipeline along-path heat loss model; then, using an energy conservation law model to obtain steam enthalpy values Q' at all nodes; finally, obtaining moisture dryness values X of different node positions according to a moisture thermal physical property model, and establishing the model to perform the following equivalence and simplification: (1) the heat transfer process is considered as steady state heat exchange of the multi-layer cylinder; (2) The temperature of the outer insulating layer obtained by the optical fiber is approximately the temperature of the outer protective layer; (3) The heat-insulating layers are equivalent to one heat-insulating layer, and the comprehensive heat transfer coefficient is lambda'.
The simplified calculation model and the related calculation method are as follows:
pipeline along-path heat loss calculation model in unit time:
Wherein: q Heat of the body -heat dissipation loss of the pipeline to the atmosphere through the outer heat-insulating layer, kJ/h;
A-the external surface area of the pipe, the product of the pipe circumference and the length pi DL, m 2;
D, diameter of an outer protective layer of the pipeline, m;
h, the convection heat exchange coefficient of the pipeline surface and the environment is related to wind speed;
t 0, the temperature of each optical fiber temperature measuring point of the outer heat preservation layer of the pipeline, and the temperature is lower than the temperature;
t f -ambient temperature, DEG C;
epsilon-emissivity of radiation on the outer surface of the pipe;
C 0 -boltzmann constant.
The pipeline heat preservation effect calculation model (heat preservation effect test model) can obtain comprehensive heat preservation coefficients lambda '(lambda' can reflect the heat preservation effect of the steam transmission pipeline) at different nodes:
Q Heat of the body ＝Q Heat of the body '；
because the outer protective layer of the pipeline is only 1-2mm thick and the heat conductivity coefficient lambda 0 'of the galvanized iron sheet is far less than lambda', the thermal resistance is high Negligible, can be deduced:
wherein: q Heat of the body ' -heat transfer quantity of medium in the pipeline along the iron sheet pipeline and the heat insulation layer, kJ/h;
t m -medium temperature in the pipeline, DEG C;
lambda 0 -the heat transfer coefficient of the metal pipe;
Lambda' -the integrated thermal conductivity of the heat-insulating layer;
d 1,d2, diameter of inner wall and outer wall of metal pipeline, m;
d 3, the diameter outside the heat-insulating layer of the pipeline, m;
D 4 -diameter D, m of the outer protective layer of the pipeline.
Using the energy conservation law model, obtaining the steam heat value Q' at each node (optical fiber temperature measuring point):
Q'＝Q0-Q Heat of the body ；
wherein: steam enthalpy value at Q' -pipe node (corresponding to optical fiber temperature measuring point), kJ/h;
Q 0 -the enthalpy of steam at the inlet of the pipe, kJ/h.
Wet steam dryness X calculation model:
hx＝Xh"+(1-X)h'；
Namely:
Wherein:
X-wet saturated steam dryness;
m-medium flow in the pipeline, kg/h;
h' -measuring the corresponding saturated water enthalpy value at the medium temperature in the pipeline, kJ/(kg×K);
h' -measuring the corresponding dry saturated steam enthalpy value, kJ/(kg X K) at the medium temperature in the channel.
From the foregoing, in one embodiment, the data acquisition control system may be specifically configured to obtain a comprehensive heat insulation coefficient of the steam delivery pipeline according to the following heat insulation effect test model; the comprehensive heat preservation coefficient is used for reflecting the heat preservation effect of the steam transmission pipeline:
Wherein t m is the temperature of the medium in the steam transmission pipeline; lambda 0 is the heat transfer coefficient of the steam transmission pipeline; lambda' is the comprehensive heat conductivity coefficient of the heat insulation layer; d 1 is the diameter of the inner wall of the steam transmission pipeline; d 2 is the diameter of the outer wall of the steam transmission pipeline; d 3 is the diameter outside the heat-insulating layer; d 4 is the diameter of the outer protective layer of the steam transmission pipeline.
From the foregoing, in one embodiment, the data acquisition control system may be specifically configured to obtain a plurality of wet steam dryness data of different positions of the steam delivery pipe along the length direction according to the following wet steam dryness test model:
Wherein Q' =q 0-Q Heat of the body ;
Wherein X is the dryness of wet steam; m is the medium flow in the steam transmission pipeline; h' is the corresponding saturated water enthalpy value at the medium temperature in the steam transmission pipeline; h' is the corresponding enthalpy value of the dry saturated steam at the medium temperature in the steam transmission pipeline; q' is the steam enthalpy value of each different position of the steam transmission pipeline; q 0 is the steam enthalpy value at the inlet of the steam conveying pipeline; q Heat of the body is the heat dissipation loss of the steam transmission pipeline to the atmosphere through the heat insulation layer; a is the outer surface area of a steam transmission pipeline; d is the diameter of an outer protective layer of the steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
In one embodiment, as shown in FIG. 2, the data acquisition control system may include: the receiving unit 91 is configured to receive temperature data and pressure data of a medium in the steam delivery pipeline reported by the temperature-pressure integrated sensor, temperature data and wind speed data of the environment reported by the ambient temperature-wind speed integrated sensor, and a plurality of temperature data of different positions along the length direction of the steam delivery pipeline reported by the optical fiber demodulator; and the dryness determining unit 92 is configured to obtain a plurality of humidity dryness data of the steam delivery pipeline to be tested at different positions along the length direction according to temperature data and pressure data of the medium in the steam delivery pipeline, temperature data and wind speed data of the environment, a plurality of temperature data at different positions along the length direction of the steam delivery pipeline, and a pre-established humidity dryness test model.
In one embodiment, as shown in fig. 3, the data acquisition control system may further include: the thermal insulation effect determining unit 93 is configured to obtain thermal insulation effect data of the steam delivery pipeline to be tested according to the temperature data and the pressure data of the medium in the steam delivery pipeline, the temperature data and the wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam delivery pipeline, and a pre-established thermal insulation effect test model.
In one embodiment, the online testing device for wet steam dryness of a steam transmission pipeline may further include: and the protective layer 5 is arranged outside the temperature measuring optical fiber.
In the concrete implementation, the arrangement of the protective layer 5 ensures that the online test of the wet steam dryness of the steam transmission pipeline is stably carried out.
In one embodiment, the online testing device for wet steam dryness of a steam transmission pipeline may further include: the optical fiber pigtail 10 has a first end connected with the temperature measuring optical fiber and a second end connected with the optical fiber demodulator for transmitting the preset wavelength spectrum or temperature data.
In specific implementation, the fiber tail fiber 10 is used for transmitting the preset wavelength spectrum or temperature data, so that the online test of the wet steam dryness of the steam transmission pipeline is ensured to be carried out stably.
In conclusion, the embodiment of the invention installs the temperature measuring optical fiber on the steam transmission pipeline, has simple implementation and low cost, can realize online and accurate test of wet saturated steam dryness, can accurately judge the comprehensive heat transfer coefficient of the along-the-way heat preservation layer, evaluates the heat preservation effect of the heat preservation layer, and has important significance for evaluating the steam injection effect, implementing energy-saving technical improvement, reducing the labor intensity of workers and safe operation of the pipeline. The device has been tested in the oil extraction factory in Liaohe oil field, the measured dryness error is within the error range of 2%, and the damaged heat preservation layer can be maintained and replaced in time, thus having wide application prospect.
The embodiment of the invention also provides an online test method for the wet steam dryness of the steam transmission pipeline, as described in the following embodiment. Because the principle of solving the problem by the method is similar to that of the on-line testing device for the wet steam dryness of the steam transmission pipeline, the implementation of the method can be referred to the implementation of the on-line testing device for the wet steam dryness of the steam transmission pipeline, and the repeated parts are not repeated.
Fig. 4 is a schematic flow chart of a method for online testing the dryness of wet steam in a steam transmission pipeline according to an embodiment of the invention, as shown in fig. 4, the method includes the following steps:
Step 101: the plurality of optical fiber temperature measuring points measure a plurality of temperature data of different positions of the steam conveying pipeline along the length direction; the plurality of optical fiber temperature measuring points are arranged on the temperature measuring optical fibers at different positions along the length direction of the steam conveying pipeline; the temperature measuring optical fiber is arranged outside the heat preservation layer, and the heat preservation layer is arranged on the steam transmission pipeline to be measured;
Step 102: the temperature and pressure integrated sensor acquires temperature data and pressure data of a medium in the steam transmission pipeline;
step 103: the method comprises the steps that an ambient temperature and wind speed integrated sensor obtains ambient temperature data and wind speed data;
Step 104: the optical fiber demodulator transmits a preset wavelength spectrum to the temperature measuring optical fiber, and acquires a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
Step 105: the data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model.
In one embodiment, as shown in fig. 5, the online testing method for the wet steam dryness of the steam delivery pipeline may further include step 106: and the data acquisition control system obtains heat preservation effect data of the steam transmission pipeline to be detected according to the temperature data and the pressure data of the medium in the steam transmission pipeline, the temperature data and the wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established heat preservation effect test model.
In one embodiment, the data acquisition control system obtains the thermal insulation effect of the steam delivery pipeline according to the temperature data and the pressure data of the medium in the steam delivery pipeline, the temperature data and the wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam delivery pipeline, and a pre-established thermal insulation effect test model, and the method may include: obtaining the comprehensive heat preservation coefficient of the steam transmission pipeline according to the following heat preservation effect test model; the comprehensive heat preservation coefficient is used for reflecting the heat preservation effect of the steam transmission pipeline:
Wherein t m is the temperature of the medium in the steam transmission pipeline; lambda 0 is the heat transfer coefficient of the steam transmission pipeline; lambda' is the comprehensive heat conductivity coefficient of the heat insulation layer; d 1 is the diameter of the inner wall of the steam transmission pipeline; d 2 is the diameter of the outer wall of the steam transmission pipeline; d 3 is the diameter outside the heat-insulating layer; d 4 is the diameter of the outer protective layer of the steam transmission pipeline.
In one embodiment, the data acquisition control system obtains a plurality of wet steam dryness of the steam delivery pipeline at different positions along the length direction according to temperature data and pressure data of a medium in the steam delivery pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam delivery pipeline, and a pre-established wet steam dryness test model, and the method may include: obtaining a plurality of wet steam dryness data of different positions of the steam transmission pipeline along the length direction according to the following wet steam dryness test model:
Wherein Q' =q 0-Q Heat of the body ;
Wherein X is the dryness of wet steam; m is the medium flow in the steam transmission pipeline; h' is the corresponding saturated water enthalpy value at the medium temperature in the steam transmission pipeline; h' is the corresponding enthalpy value of the dry saturated steam at the medium temperature in the steam transmission pipeline; q' is the steam enthalpy value of each different position of the steam transmission pipeline; q 0 is the steam enthalpy value at the inlet of the steam conveying pipeline; q Heat of the body is the heat dissipation loss of the steam transmission pipeline to the atmosphere through the heat insulation layer; a is the outer surface area of a steam transmission pipeline; d is the diameter of an outer protective layer of the steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
In one embodiment, the online testing method for the wet steam dryness of the steam transmission pipeline can further comprise the following steps: the wet steam dryness test model is established according to the following method:
obtaining the along-path heat loss data of the steam transmission pipeline through the along-path heat loss model of the steam transmission pipeline;
Acquiring steam enthalpy values at all optical fiber temperature measuring points by using an energy conservation law model and along-path heat loss data of a steam transmission pipeline;
and establishing a wet steam dryness test model according to the steam thermal physical property model and the steam enthalpy value at each optical fiber temperature measuring point.
In one embodiment, the online testing method for the wet steam dryness of the steam transmission pipeline can further comprise the following steps: the protective layer is arranged outside the temperature measuring optical fiber.
In one embodiment, the online testing method for the wet steam dryness of the steam transmission pipeline can further comprise the following steps: transmitting preset wavelength spectrum or temperature data by utilizing an optical fiber tail fiber; the first end of the optical fiber tail fiber is connected with the temperature measuring optical fiber, and the second end of the optical fiber tail fiber is connected with the optical fiber demodulator.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the online testing method of the wet steam dryness of the steam transmission pipeline when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium which stores a computer program for executing the online testing method for the wet steam dryness of the steam transmission pipeline.
In the embodiment of the invention, compared with the technical scheme that the real-time online test cannot be performed in the prior art, the test result cannot truly and continuously reflect the steam dryness parameter of the whole production process, the method has the advantages that: the plurality of optical fiber temperature measuring points measure a plurality of temperature data of different positions of the steam conveying pipeline along the length direction; the plurality of optical fiber temperature measuring points are arranged on the temperature measuring optical fibers at different positions along the length direction of the steam transmission pipeline; the temperature measuring optical fiber is arranged outside the heat preservation layer, and the heat preservation layer is arranged on the steam transmission pipeline to be measured; the temperature and pressure integrated sensor acquires temperature data and pressure data of a medium in the steam transmission pipeline; the method comprises the steps that an ambient temperature and wind speed integrated sensor obtains ambient temperature data and wind speed data; the optical fiber demodulator transmits a preset wavelength spectrum to the temperature measuring optical fiber, and acquires a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber; the data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model, and can acquire along-path wet steam dryness data of the steam transmission pipeline, so that real-time change conditions of the along-path wet steam dryness of the steam transmission pipeline can be known, further, the steam injection effect can be accurately analyzed and mastered, and the thermal recovery efficiency is improved.
In addition, according to the temperature data and the pressure data of the medium in the steam transmission pipeline, the temperature data and the wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established heat preservation effect test model, heat preservation effect data of the steam transmission pipeline to be tested can be obtained, and then leakage condition of the steam transmission pipeline can be judged.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (14)
1. The utility model provides a steam pipeline wet steam dryness on-line measuring device which characterized in that includes:
The heat preservation layer is arranged on the steam transmission pipeline to be tested;
the temperature measuring optical fiber is arranged outside the heat preservation layer; the temperature measuring optical fiber comprises a plurality of optical fiber temperature measuring points which are arranged at different positions along the length direction of the steam conveying pipeline, and the plurality of optical fiber temperature measuring points are used for measuring a plurality of temperature data of the steam conveying pipeline at different positions along the length direction;
the temperature and pressure integrated sensor is arranged on the steam transmission pipeline to be detected and is used for acquiring temperature data and pressure data of a medium in the steam transmission pipeline;
the environment temperature and wind speed integrated sensor is used for acquiring temperature data and wind speed data of the environment;
The optical fiber demodulator is connected with the temperature measuring optical fiber and is used for transmitting a preset wavelength spectrum to the temperature measuring optical fiber, and a plurality of temperature data at different positions along the length direction of the steam transmission pipeline are obtained by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
The data acquisition control system is connected with the temperature and pressure integrated sensor, the ambient temperature and wind speed integrated sensor and the optical fiber demodulator and is used for obtaining a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model; according to a plurality of wet steam dryness data of the steam transmission pipeline to be tested at different positions along the length direction, the real-time change condition of the wet steam dryness of the steam transmission pipeline along the path is known, so that the steam injection effect is analyzed and mastered; the wet steam dryness test model is built according to the steam enthalpy value at each optical fiber temperature measuring point;
The data acquisition control system is particularly used for obtaining a plurality of wet steam dryness data of different positions of the steam transmission pipeline along the length direction according to the following wet steam dryness test model:
Wherein Q' =q 0-Q Heat of the body ;
Wherein X is the dryness of wet steam; m is the medium flow in the steam transmission pipeline; h' is the corresponding saturated water enthalpy value at the medium temperature in the steam transmission pipeline; h' is the corresponding enthalpy value of the dry saturated steam at the medium temperature in the steam transmission pipeline; q' is the steam enthalpy value of each different position of the steam transmission pipeline; q 0 is the steam enthalpy value at the inlet of the steam conveying pipeline; q Heat of the body is the heat dissipation loss of the steam transmission pipeline to the atmosphere through the heat insulation layer; a is the outer surface area of a steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
2. The online testing device for the wet steam dryness of the steam transmission pipeline according to claim 1, wherein the data acquisition control system is further used for obtaining heat preservation effect data of the steam transmission pipeline to be tested according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline, and a pre-established heat preservation effect testing model.
3. The online testing device for the dryness of the wet steam of the steam transmission pipeline according to claim 2, wherein the data acquisition control system is specifically used for obtaining the comprehensive heat preservation coefficient of the steam transmission pipeline according to the following heat preservation effect testing model; the comprehensive heat preservation coefficient is used for reflecting the heat preservation effect of the steam transmission pipeline:
Wherein t m is the temperature of the medium in the steam transmission pipeline; lambda 0 is the heat transfer coefficient of the steam transmission pipeline; lambda' is the comprehensive heat preservation coefficient; d 1 is the diameter of the inner wall of the steam transmission pipeline; d 2 is the diameter of the outer wall of the steam transmission pipeline; d 3 is the diameter outside the heat-insulating layer; d is the diameter of an outer protective layer of the steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
4. The on-line steam dryness testing device for steam transmission pipelines according to claim 1, further comprising: the protective layer is arranged outside the temperature measuring optical fiber.
5. The on-line steam dryness testing device for steam transmission pipelines according to claim 1, further comprising: the first end of the optical fiber tail fiber is connected with the temperature measuring optical fiber, and the second end of the optical fiber tail fiber is connected with the optical fiber demodulator and is used for transmitting preset wavelength spectrum or temperature data.
6. The on-line testing device for the dryness of the wet steam of the steam transmission pipeline according to claim 1, further comprising a model building unit for building a model for testing the dryness of the wet steam according to the following method:
obtaining the along-path heat loss data of the steam transmission pipeline through the along-path heat loss model of the steam transmission pipeline;
Acquiring steam enthalpy values at all optical fiber temperature measuring points by using an energy conservation law model and along-path heat loss data of a steam transmission pipeline;
and establishing a wet steam dryness test model according to the steam thermal physical property model and the steam enthalpy value at each optical fiber temperature measuring point.
7. The online testing method for the wet steam dryness of the steam transmission pipeline is characterized by comprising the following steps of:
The plurality of optical fiber temperature measuring points measure a plurality of temperature data of different positions of the steam conveying pipeline along the length direction; the plurality of optical fiber temperature measuring points are arranged on the temperature measuring optical fibers at different positions along the length direction of the steam conveying pipeline; the temperature measuring optical fiber is arranged outside the heat preservation layer, and the heat preservation layer is arranged on the steam transmission pipeline to be measured;
The temperature and pressure integrated sensor acquires temperature data and pressure data of a medium in the steam transmission pipeline;
the method comprises the steps that an ambient temperature and wind speed integrated sensor obtains ambient temperature data and wind speed data;
The optical fiber demodulator transmits a preset wavelength spectrum to the temperature measuring optical fiber, and acquires a plurality of temperature data at different positions along the length direction of the steam transmission pipeline by utilizing the Raman signal and the optical time domain reflection principle of the optical fiber;
the data acquisition control system obtains a plurality of wet steam dryness data of the steam transmission pipeline to be detected at different positions along the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established wet steam dryness test model; according to a plurality of wet steam dryness data of the steam transmission pipeline to be tested at different positions along the length direction, the real-time change condition of the wet steam dryness of the steam transmission pipeline along the path is known, so that the steam injection effect is analyzed and mastered; the wet steam dryness test model is built according to the steam enthalpy value at each optical fiber temperature measuring point;
The data acquisition control system obtains a plurality of wet steam dryness of the steam transmission pipeline along different positions of the length direction according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline, and a pre-established wet steam dryness test model, and comprises the following components: obtaining a plurality of wet steam dryness data of different positions of the steam transmission pipeline along the length direction according to the following wet steam dryness test model:
Wherein Q' =q 0-Q Heat of the body ;
Wherein X is the dryness of wet steam; m is the medium flow in the steam transmission pipeline; h' is the corresponding saturated water enthalpy value at the medium temperature in the steam transmission pipeline; h' is the corresponding enthalpy value of the dry saturated steam at the medium temperature in the steam transmission pipeline; q' is the steam enthalpy value of each different position of the steam transmission pipeline; q 0 is the steam enthalpy value at the inlet of the steam conveying pipeline; q Heat of the body is the heat dissipation loss of the steam transmission pipeline to the atmosphere through the heat insulation layer; a is the outer surface area of a steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
8. The method for online testing of wet steam dryness of a steam delivery pipeline according to claim 7, further comprising: and the data acquisition control system obtains heat preservation effect data of the steam transmission pipeline to be detected according to the temperature data and the pressure data of the medium in the steam transmission pipeline, the temperature data and the wind speed data of the environment, a plurality of temperature data of different positions along the length direction of the steam transmission pipeline and a pre-established heat preservation effect test model.
9. The method for online testing of wet steam dryness of a steam transmission pipeline according to claim 8, wherein the data acquisition control system obtains a thermal insulation effect of the steam transmission pipeline according to temperature data and pressure data of a medium in the steam transmission pipeline, temperature data and wind speed data of an environment, a plurality of temperature data at different positions along the length direction of the steam transmission pipeline, and a pre-established thermal insulation effect test model, and the method comprises the following steps: obtaining the comprehensive heat preservation coefficient of the steam transmission pipeline according to the following heat preservation effect test model; the comprehensive heat preservation coefficient is used for reflecting the heat preservation effect of the steam transmission pipeline:
Wherein t m is the temperature of the medium in the steam transmission pipeline; lambda 0 is the heat transfer coefficient of the steam transmission pipeline; lambda' is the comprehensive heat preservation coefficient; d 1 is the diameter of the inner wall of the steam transmission pipeline; d 2 is the diameter of the outer wall of the steam transmission pipeline; d 3 is the diameter outside the heat-insulating layer; d is the diameter of an outer protective layer of the steam transmission pipeline; h is the convection heat transfer coefficient of the surface of the steam transmission pipeline and the environment, and is related to the wind speed; t 0 is the temperature of each optical fiber temperature measuring point of the heat preservation layer; t f is ambient temperature; epsilon is the emissivity of radiation on the outer surface of the steam transmission pipeline; c 0 is the Boltzmann constant.
10. The method for online testing of wet steam dryness of a steam delivery pipeline according to claim 7, further comprising: the wet steam dryness test model is established according to the following method:
obtaining the along-path heat loss data of the steam transmission pipeline through the along-path heat loss model of the steam transmission pipeline;
Acquiring steam enthalpy values at all optical fiber temperature measuring points by using an energy conservation law model and along-path heat loss data of a steam transmission pipeline;
and establishing a wet steam dryness test model according to the steam thermal physical property model and the steam enthalpy value at each optical fiber temperature measuring point.
11. The method for online testing of wet steam dryness of a steam delivery pipeline according to claim 7, further comprising: the protective layer is arranged outside the temperature measuring optical fiber.
12. The method for online testing of wet steam dryness of a steam delivery pipeline according to claim 7, further comprising: transmitting preset wavelength spectrum or temperature data by utilizing an optical fiber tail fiber; the first end of the optical fiber tail fiber is connected with the temperature measuring optical fiber, and the second end of the optical fiber tail fiber is connected with the optical fiber demodulator.
13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 7 to 12 when executing the computer program.
14. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 7 to 12.
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