Underwater thermomanometer pressure compensation method

Abstract

The invention discloses a pressure compensation method for an underwater temperature and pressure gauge, and belongs to the technical field of underwater detection.The pressure compensation method comprises the steps that the underwater temperature and pressure gauge is connected into a calibration device, fluid is introduced for calibration, and the real-time calibration temperature Ti of the underwater temperature and pressure gauge is controlled to be kept stable; the real-time standard pressure Pi of the introduced fluid is changed, and the real-time measured pressure Pj output by the pressure sensor is obtained; calculating a real-time relative error Erel; and fitting the relationship between the relative error E and the measured pressure Pc output by the pressure sensor based on the real-time measured pressure Pj and the real-time relative error Erel, connecting the underwater thermomanometer into a production pipeline, and performing compensation calculation on the measured pressure Pc output by the pressure sensor to obtain a compensation pressure Pf as a metering result. According to the method, the stable working condition temperature and the unstable working condition temperature of the underwater thermomanometer can be modified respectively, pressure compensation algorithms corresponding to different temperatures are obtained, and the measurement precision and stability of the pressure sensor can be improved.

Description

Technical Field

[0001] The invention belongs to the field of underwater detection technology, and in particular relates to a pressure compensation method for an underwater temperature and pressure gauge. Background Art

[0002] During the process of offshore oil extraction, it is necessary to pay attention to the acquisition of temperature, pressure and other data in real time to calculate relevant production data and provide a basis for decision-making. The acquisition of underwater temperature and pressure data generally relies on temperature sensors and pressure sensors. During production, relevant data can be obtained in real time underwater under the temperature and pressure gauge composed of a temperature sensor and a pressure sensor; among them, the silicon piezoresistive pressure sensor is sensitive to temperature, and temperature changes will cause changes in the resistance of the core device (i.e., the pressure chip) in the silicon piezoresistive pressure sensor, which will lead to inaccurate output pressure, directly affecting the accuracy of the measurement results. This situation becomes more obvious as the pressure to be measured decreases. Therefore, in order to obtain relatively more accurate pressure data, it is necessary to correct the impact of temperature changes on the pressure sensor and perform compensation calculations on the measured pressure of the pressure sensor.

[0003] Therefore, it is urgent to design a pressure compensation method for an underwater temperature and pressure gauge to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure compensation method for an underwater thermometer and pressure gauge, which has the advantage of obtaining pressure compensation algorithms corresponding to different thermometers and pressure gauges to improve the measurement accuracy and stability of the pressure sensor, thereby solving the problems mentioned in the background technology.

[0005] To achieve the above purpose, the specific technical solution of the underwater temperature and pressure gauge pressure compensation method of the present invention is as follows:

[0006] A pressure compensation method for an underwater temperature and pressure gauge comprises the following steps:

[0007] S1. Connect the underwater temperature and pressure gauge to the calibration device and introduce fluid for calibration. The underwater temperature and pressure gauge includes a temperature sensor and a pressure sensor.

[0008] S2, control the real-time calibration temperature T of the underwater temperature and pressure gauge i Stay stable;

[0009] S3. Change the real-time standard pressure P of the incoming fluid i , obtain the real-time measured pressure P output by the pressure sensor j ;

[0010] S4. Calculate the real-time relative error E rel , the formula is:

[0011]

[0012] S5, based on real-time pressure measurement P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c The relationship is:

[0013] E=f(P c );

[0014] S6. Change the real-time calibration temperature T i To different temperatures and keep stable, repeat S3 and S4, based on the real-time calibration temperature T i , Real-time measurement of pressure P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c , the relationship between the calibration temperature T, the formula is:

[0015] E=f(T,P c );

[0016] S7. Connect the underwater temperature and pressure gauge to the production pipeline and measure the pressure P output by the pressure sensor. c Perform compensation calculation to obtain the compensation pressure P f As a result of the measurement, the formula is:

[0017]

[0018] When the underwater temperature and pressure gauge operates at a stable operating temperature, E is the calculation result of S5;

[0019] When the underwater temperature and pressure gauge operates at an unstable operating temperature, E is the calculation result of S6.

[0020] Further, in S1, the underwater temperature gauge includes a housing, and a temperature sensor and a pressure sensor are installed in the housing.

[0021] Further, in S5, according to the real-time standard pressure P i Or the measured pressure P c The size of the partition fitting relative error E and the measured pressure P output by the pressure sensor c The relationship is:

[0022] E=f(P c )=a*EXP(b*P c )+c;

[0023] Where a, b, and c are parameters obtained by fitting.

[0024] Further, in S6, the real-time calibration temperature T is observed. i , Real-time measurement of pressure Pj , Real-time relative error E rel The relationship between the real-time calibration temperature T i Real-time pressure measurement P j The real-time relative error E rel In the case of i , Real-time measurement of pressure P j , Real-time relative error E rel Divided into different sections.

[0025] Furthermore, the multivariate linear fitting method is used to fit the relative error E of the segmented fitting and the measured pressure P output by the pressure sensor. c , and the calibration temperature T, and the formula for the relative error E of each section is obtained.

[0026] Further, in S7, when the underwater temperature and pressure gauge operates at an unstable operating temperature, the relative error E is calculated using a corresponding formula according to the section to which the measured operating temperature value belongs.

[0027] Furthermore, the real-time calibration temperature T i , Real-time measurement of pressure P j , Real-time relative error E rel The partitioned segments were imported into Matlab for multivariate linear fitting.

[0028] Furthermore, in S6,

[0029]

[0030] In the formula, Q 0 -Q 20 is the fitting coefficient.

[0031] The present invention has the following advantages: the method can be modified according to the stable operating temperature and unstable operating temperature of the underwater temperature and pressure gauge respectively, and the pressure compensation algorithm corresponding to different temperatures can be obtained, so as to improve the measurement accuracy and stability of the pressure sensor. In addition, the method has the advantages of simple implementation and strong operability, and can be widely used in pressure correction in various industrial fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 For the present invention i -P j -E rel Graphs;

[0033] Figure 2 The structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 1 ;

[0034] Figure 3 The structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 2 ;

[0035] Figure 4 The cross-sectional structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0037] Figure 6 The structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 3 ;

[0038] Figure 7 The cross-sectional structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 2 ;

[0039] Figure 8 The structure of the temperature and pressure sensor of the present invention is shown in FIG. Figure 4 ;

[0040] Explanation of marks in the figure: 1. Shell; 11. Electronic compartment; 12. Flange; 13. Compartment body; 14. Insulation sleeve; 15. Second electrical connector; 16. Third sealing ring; 17. Second limiter; 2. Probe assembly; 21. Wiring hole; 22. First electrical connector; 23. Second sealing ring; 24. Base; 25. Connecting pipe; 26. Pressure detection probe; 27. Temperature detection probe; 28. First limiter; 29. ​​Limit sleeve; 210. Pressure detection hole; 211. First sealing ring; 3. Circuit transmission assembly; 31. Bracket; 32. PCB board; 33. Limit ring; 4. Flying wire. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0043] Please refer to the attached Figure 1 To Attachment Figure 7The invention describes a pressure compensation method for an underwater temperature and pressure gauge.

[0044] Embodiment 1:

[0045] A pressure compensation method for an underwater temperature and pressure gauge comprises the following steps:

[0046] S1. Connect the underwater temperature and pressure gauge to the calibration device and introduce fluid for calibration. The underwater temperature and pressure gauge includes a temperature sensor and a pressure sensor.

[0047] S2, adjusting the real-time calibration temperature T of the underwater temperature and pressure gauge i , so that T i Keep it stable, the process can be carried out in an incubator;

[0048] S3, constantly changing the real-time standard pressure P of the incoming fluid i , and obtain the real-time measured pressure P output by the pressure sensor j ;

[0049] S4. Real-time relative error E of calculated pressure rel , the formula is:

[0050]

[0051] S5, based on real-time pressure measurement P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c The relationship is:

[0052] E=f(P c );

[0053] S6. Change the calibration temperature T i To another different temperature value and keep stable, repeat S3 and S4, based on the real-time calibration temperature T i , Real-time measurement of pressure P j and real-time relative error E rel , the relationship between the fitting relative error E and the measured pressure Pc and calibration temperature T output by the pressure sensor is as follows:

[0054] E=f(T,P c );

[0055] S7. Connect the underwater temperature and pressure gauge to the production pipeline and measure the pressure P output by the pressure sensor. c Perform compensation calculation to obtain the compensation pressure P f As a result of the measurement, the formula is:

[0056]

[0057] S5 and S6 above give two different fitting formulas for the relative error E. The main difference between them is:

[0058] When the underwater temperature and pressure gauge works at a stable working temperature without change, or the temperature change is very small, E is the calculation result of S5. At this time, the formula of S5 can be further expressed as:

[0059] E=f(P c )=a*EXP(b*P c )+c;

[0060] Where a, b, and c are parameters obtained by fitting.

[0061] When the underwater temperature and pressure gauge works in an unstable working condition where the temperature changes in real time, E is the calculation result of S6. Further, in S6, it is necessary to observe the real-time calibration temperature T i , Real-time measurement of pressure P j , Real-time relative error E rel The relationship between the real-time calibration temperature T i Real-time pressure measurement P j The real-time relative error E rel In the case of i , Real-time measurement of pressure P j , Real-time relative error E rel Divide it into different sections, and then use the multivariate linear fitting method, the relative error E of the section fitting and the measured pressure P output by the pressure sensor c , the relationship between the calibration temperature T, and the formula for the relative error E of each section is obtained;

[0062] For the convenience of fitting, the real-time calibration temperature T i , Real-time measurement of pressure P j , Real-time relative error E rel The segmented data were imported into Matlab for multivariate linear fitting.

[0063] In S6, the specific multivariate linear fitting formula is:

[0064]

[0065] Where: Q 0 -Q 20 is the fitting coefficient, obtained by fitting.

[0066] Correspondingly, in step seven, when the underwater temperature and pressure gauge operates at an unstable operating temperature, the relative error E is calculated using a corresponding formula according to the section to which the measured operating temperature value belongs.

[0067] Embodiment 2:

[0068] A pressure compensation method for an underwater temperature and pressure gauge in a variable temperature environment comprises the following steps:

[0069] S1. Connect the underwater temperature and pressure gauge to the calibration device and introduce fluid for calibration. The underwater temperature and pressure gauge includes a temperature sensor and a pressure sensor.

[0070] S2, adjusting the real-time calibration temperature T of the underwater temperature and pressure gauge i , so that T i Keep it stable, the process can be carried out in an incubator;

[0071] S3, constantly changing the real-time standard pressure P of the incoming fluid i , and obtain the real-time measured pressure P output by the pressure sensor j ;

[0072] S4. Real-time relative error E of calculated pressure rel , the formula is:

[0073]

[0074] S5. Change the fluid to another temperature and maintain it again. After a period of time, the temperature of the system will be rebalanced and the temperature T will be calibrated in real time. i Thus, it can spontaneously adjust to different temperatures and keep stable, repeating S3 and S4 to obtain several sets of real-time calibration temperatures T i , Real-time standard pressure P i , Real-time measurement of pressure P j , Real-time relative error E rel Array-(T i , P i , P j 、E rel ) array, some of the extracted data are shown in Table 1;

[0075] The following is based on (T i , P i , P j 、E rel )Array fitting relative error E and measured pressure P output by pressure sensor c , the relationship between the calibration temperature T E = f (T, P c );

[0076] In order to facilitate the observation of real-time calibration temperature T i Real-time pressure measurement P j The real-time relative error E rel In this case, we can draw T i -P j -E rel Three-dimensional rectangular coordinate system, to intuitively see the relative error Erel The original T i , P j 、E rel The data is plotted in a three-dimensional rectangular coordinate system as Figure 1 As shown, it can be seen that:

[0077] Ⅰ. Real-time calibration temperature T i Real-time pressure measurement P j The real-time relative error E rel The basic situation is: at a fixed real-time calibration temperature T i The calculated real-time relative error E rel With the measured pressure P j The overall positive or negative shift is caused by the decrease of

[0078] II. E rel The overall positive or negative shift of

[0079] Therefore, the most basic thing is: should be based on the relative error E rel The positive or negative offset of (T i , P i , P j 、E rel ) array for partition fitting. On this basis, secondary partition fitting can also be performed according to the degree of offset. The specific fitting algorithm can adopt a multivariate linear fitting method and use Mat lab tools for fitting. It should be noted that: the fitting process requires enough data to be performed, which is well known to those skilled in the art.

[0080] In order to explain the partition fitting results in more detail, in a specific implementation, (T i , P i , P j 、E rel ) The array is divided into four sections for fitting respectively, and the general fitting formula is:

[0081]

[0082] After fitting, the fitting coefficients Q of each segment are obtained. 0 -Q 20 See Table 2:

[0083] S7, connect the underwater temperature and pressure gauge to the production pipeline, and calculate the relative error E using the corresponding formula according to the section to which the measured online working condition temperature value belongs, and then calculate the measured pressure P output by the pressure sensor. c Perform compensation calculation to obtain the compensation pressure P f As a result of the measurement, the formula is:

[0084]

[0085] Calculated relative error E and compensation pressure P f See Table 1, P f With P i The absolute error results are shown in Table 1, and the full-scale error is shown in Table 1.

[0086] Table 1, variable temperature environment T i , P i , P j 、E rel , E, P f , absolute error, full range error statistics table

[0087]

[0088]

[0089] It can be seen from Table 1 that the compensation pressure P after correction calculation f Obviously closer to the standard pressure P i , compensation pressure P f The relative error and full-scale error are both small.

[0090] Table 2. Fitting coefficients Q for each segment 0 -Q 20 Statistics

[0091]

[0092]

[0093] Embodiment 3:

[0094] A pressure compensation method for an underwater thermobarometer under a stable working temperature comprises the following steps:

[0095] S1. Connect the underwater temperature and pressure gauge to the calibration device and introduce fluid for calibration. The underwater temperature and pressure gauge includes a temperature sensor and a pressure sensor.

[0096] S2, adjusting the real-time calibration temperature T of the underwater temperature and pressure gauge i To operating temperature (25°C);

[0097] S3. Change the real-time standard pressure P of the incoming fluid i , obtain the real-time measured pressure P output by the pressure sensor j ; Determine the number of P i and P j Value, some data are extracted as shown in Table 3;

[0098] S4. Calculate the real-time relative error Erel , the formula is:

[0099]

[0100] Relative error E rel The calculation results are shown in Table 3;

[0101] S5, based on real-time pressure measurement P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c The relationship is:

[0102] E=f(P c )=a*EXP(b*P c )+c;

[0103] Combination Figure 1 It can be known that when the temperature and pressure gauge is working under a stable working condition, the influence of the test pressure on the relative error is different. Therefore, when fitting the formula of relative error E, you can choose overall fitting or segmented fitting according to the pressure size. Overall fitting is applicable to relative error E-measured pressure P j / Standard pressure P i The curve is relatively smooth and coherent; the segmented fitting can be used for EP j / P i Smooth curves, coherent scenes, more suitable for EP j / P i The curve is not smooth and coherent. The basis of segmented fitting is to measure the pressure P j Or standard pressure P i , and ultimately the node values ​​of the piecewise fitting are artificially defined.

[0104] The following is an example of a segmented fitting process in a specific implementation method: the node of the segmented fitting is artificially set to P i =5MPa;

[0105] Substituting the data in the range of <5MPa (specifically 0-5MPa) into the following formula, the fitted expression is:

[0106] E=f(P c )=1.129*EXP(-0.7036*P c )-7.484;

[0107] Substituting the data in the range of ≥5MPa (specifically 5-69MPa) into the following formula, the fitted expression is:

[0108] E=f(P c)=-7.496*EXP(-0.0005721*P c );

[0109] S6, connect the underwater temperature and pressure gauge to the production pipeline, and measure the pressure P c The relative error E is calculated for each section, and the measured pressure P output by the pressure sensor is c Perform compensation calculation to obtain the compensation pressure P f As a result of the measurement, the formula is:

[0110]

[0111] Calculated relative error E, compensation pressure P f The calculation results are shown in Table 3, and the full-scale error is shown in Table 3.

[0112] Table 3, stable operating temperature P i , P j 、E rel , E, P f , Full range error statistics table

[0113]

[0114]

[0115] It can be seen from Table 3 that the compensation pressure P after correction calculation f Obviously closer to the standard pressure P i , compensation pressure P f The full-scale error is very small.

[0116] The underwater temperature and pressure sensor includes a shell 1, an electronic compartment 11 is provided in the shell 1, the electronic compartment 11 is used for routing a circuit transmission component 3, a mounting hole is provided at a first direction end A of the shell 1, a probe component 2 is plugged into the mounting hole, the mounting hole is connected with the electronic compartment 11, after the probe component 2 is plugged into the mounting hole, the probe component 2 is sealed and connected with the mounting hole, the probe component 2 is communicatively connected with a flying line 4 component, a flying line 4 is fixedly connected with a second direction end B of the shell 1, a connecting hole is provided at the second direction end B of the shell 1, the connecting hole is communicated with the electronic compartment 11, and the circuit transmission component 3 is communicatively connected with the flying line 4 through the connecting hole.

[0117] Specifically, after the probe assembly 2 is plugged into the mounting hole, the probe assembly 2 is sealed and fixed to the mounting hole, and a first sealing ring 211 is provided at the connection between the probe assembly 2 and the mounting hole. A first sealing barrier is formed by sealing and welding between the probe assembly 2 and the shell 1. The first sealing ring 211 provided between the probe assembly 2 and the shell 1 forms a second sealing barrier, so that the measured medium needs to break through the above-mentioned multiple sealing barriers before it can flow to the electronic compartment 11, thereby reducing the risk of medium leakage and significantly improving the reliability of the temperature and pressure sensor.

[0118] Furthermore, the probe assembly 2 includes a base 24 , in which two pressure detection probes 26 and two temperature detection probes 27 are disposed. The two pressure detection probes 26 and the two temperature detection probes 27 are symmetrically arranged, and the two pressure detection probes 26 and the two temperature detection probes 27 are communicatively connected to the circuit transmission assembly 3 .

[0119] Preferably, the two pressure detection probes 26 and the two temperature detection probes 27 are symmetrically arranged. By symmetrically arranging two sets of redundant pressure detection probes 26 and temperature detection probes 27 while keeping the size of the probe assembly 2 as small as possible, the reliability of the temperature and pressure sensor is greatly improved. In other embodiments of the present invention, the two sets of pressure detection probes 26 and temperature detection probes 27 may also be asymmetrically arranged.

[0120] Furthermore, the probe assembly 2 includes a connecting tube 25, the base 24 is sealed and fixed to the connecting tube 25, a wiring hole 21 is opened in the connecting tube 25, after the probe assembly 2 is plugged into the mounting hole, the wiring hole 21 is connected to the electronic compartment 11, a first electrical connector 22 is plugged into the wiring hole 21, a first direction end A of the first electrical connector 22 is electrically connected to the pressure detection probe 26 and the temperature detection probe 27 through a lead, and a second direction end B of the first electrical connector 22 is electrically connected to the circuit transmission component 3 through a lead.

[0121] Preferably, in order to facilitate welding, the connecting pipe 25 is formed with a step surface, which is flush with the first direction end A surface of the shell 1 after the connecting pipe 25 is inserted into the mounting hole. In other embodiments of the present invention, the step surface can be eliminated and direct welding can be performed.

[0122] After the first electrical connector 22 is plugged into the wiring hole 21, a second sealing ring 23 is provided at the connection between the first electrical connector 22 and the wiring hole 21. By providing the second sealing ring 23, in addition to the sealing welding fixation between the first sealing ring 211 and the probe assembly 2 and the shell 1, a third sealing barrier is formed, which further requires the measured medium to break through the above-mentioned multiple sealing barriers before it can flow to the electronic compartment 11, thereby reducing the risk of medium leakage and significantly improving the reliability of the temperature and pressure sensor.

[0123] Furthermore, a first limiting piece 28 is provided in the wiring hole 21, and a thread is provided on the second direction end B of the wiring hole 21. The wiring hole 21 is screwed with a limiting sleeve 29 through the thread. After the first electrical connector 22 is plugged into the wiring hole 21, the first direction end A of the first electrical connector 22 abuts against the first limiting piece 28, and then the limiting sleeve 29 is screwed into the wiring hole 21 until the limiting sleeve 29 abuts against the second direction end B of the first electrical connector 22, thereby removably fixing the first electrical connector 22 for easy maintenance in the later stage.

[0124] Preferably, the first limiting member 28 is a limiting ring 33. In other embodiments of the present invention, it may also be a limiting step, a limiting block, a limiting strip, a limiting protrusion, etc.

[0125] Furthermore, a pressure detection hole 210 is opened on the base 24, and the pressure detection hole 210 is connected with the wiring hole 21. The pressure detection probe 26 is arranged in the pressure detection hole 210, and the sensing end of the pressure detection probe 26 faces outside the pressure detection hole 210, and the output end of the pressure detection probe 26 faces inside the wiring hole 21. Through the setting of the pressure detection hole 210, the pressure detection probe 26 is in close contact with the measured medium, which effectively improves the sensitivity of the temperature and pressure sensor, saves the installation space of the sensor, and expands the scope of use.

[0126] As for the temperature detection probe 27, the base 24 can be made of a heat-conducting material, and the temperature can also be measured by using a detection hole.

[0127] The housing 1 includes a coaxially arranged main flange 12 and a chamber body 13, one end of the main flange 12 is fixedly connected to the probe assembly 2, and the end of the main flange 12 away from the probe assembly 2 is sealed and welded to the chamber body 13, the interior of the chamber body 13 forms the electronic chamber 11, the circuit transmission assembly 3 is arranged in the electronic chamber 11, and the end of the chamber body 13 away from the main flange 12 is sealed and connected to the flying wire 4. The housing 1 is formed by connecting the main flange 12 and the chamber body 13, so that the structure of the housing 1 is more reasonable and easy to process.

[0128] An insulating sleeve 14 is provided in the electronic compartment 11, and the insulating sleeve 14 is flush with the inner wall of the electronic compartment 11. The circuit transmission component 3 is inserted into the insulating sleeve 14. Specifically, the insulating sleeve 14 is provided at the connection between the main flange 12 and the compartment body 13. Through the setting of the insulating sleeve 14, the high temperature during welding is prevented from affecting the normal operation of the circuit transmission component 3.

[0129] Furthermore, a second electrical connector 15 is fixedly connected in the connecting hole, a first direction end A of the second electrical connector 15 is electrically connected to the circuit transmission component 3, a second direction end B of the second electrical connector 15 is electrically connected to the flying wire 4, a third sealing ring 16 is provided at the connection between the second electrical connector 15 and the connecting hole, a second limit member 17 is provided at one end of the connecting hole away from the circuit transmission component 3, and the second limit member 17 is against the second electrical connector 15.

[0130] Preferably, the second limiting member 17 is a limiting ring 33. In other embodiments of the present invention, it may also be a limiting step, a limiting block, a limiting strip, a limiting protrusion, etc., and the structural form of the second limiting ring 33 and the first limiting ring 33 may be the same or different.

[0131] Furthermore, the circuit transmission component 3 includes a bracket 31, on which two PCB boards 32 are installed, and limit rings 33 are formed at both ends of the bracket 31, and the two limit rings 33 are respectively abutted against two end faces corresponding to the electronic warehouse 11, the limit ring 33 at the first direction end A is arranged in the insulation sleeve 14 and a fourth sealing ring is provided between the limit ring 33 at the first direction end A and the side wall of the electronic warehouse 11, and the inner wall of the limit ring 33 at the second direction end B is interference fit with the second electrical connector 15.

[0132] Based on the circuit transmission component 3, the leads of the pressure detection probe 26 and the temperature detection probe 27 are plugged into the input end of the first electrical connector 22, the output end of the first electrical connector 22 is connected to the two PCB boards 32 through the leads, the output ends of the two PCB boards 32 are plugged into the input end of the second electrical connector 15 through the leads, the output end of the second electrical connector 15 is then connected to the flying line 4 through the leads, the flying line 4 is connected to the above-water oil production platform, so as to realize the detection and transmission of underwater temperature and pressure data.

[0133] By providing the third sealing ring 16 and the fourth sealing ring, two sealing barriers are formed between the housing 1 and the flying wire 4 . The measured medium needs to break through the two sealing barriers before entering the electronic compartment 11 .

[0134] At the same time, since at least two sealing barriers are formed at both ends of the electronic compartment 11, even if the measured medium breaks through the sealing barrier between the probe assembly 2 and the shell 1 or between the shell 1 and the electrical connector and enters the electronic compartment 11, the sealing barrier formed by the electrical connector and the sealing ring on the other side can confine the high-pressure medium in the electronic compartment without causing the medium to leak and pollute the environment.

[0135] In this example, the flying lead 4 adopts a plate-type wet-plug connector, and its outlet angle is 90°. Of course, in other optional embodiments, the outlet angle of the flying lead 4 can also be 45°, 60° or 180°, which can be customized according to needs.

[0136] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pressure compensation method for an underwater temperature and pressure gauge, characterized in that: The following steps are involved: S1. Connect the underwater temperature and pressure gauge to the calibration device and introduce fluid for calibration. The underwater temperature and pressure gauge includes a temperature sensor and a pressure sensor. S2, control the real-time calibration temperature T of the underwater temperature and pressure gauge i Stay stable; S3. Change the real-time standard pressure P of the incoming fluid i , obtain the real-time measured pressure P output by the pressure sensor j ; S4. Calculate the real-time relative error E rel , the formula is: S5, based on real-time pressure measurement P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c The relationship is: E=f(P c ); S6. Change the real-time calibration temperature T i To different temperatures and keep stable, repeat S3 and S4, based on the real-time calibration temperature T i , Real-time measurement of pressure P j and real-time relative error E rel , fitting relative error E and measured pressure P output by pressure sensor c , the relationship between the calibration temperature T, the formula is: E=f(T,P c ); S7. Connect the underwater temperature and pressure gauge to the production pipeline and measure the pressure P output by the pressure sensor. c Perform compensation calculation to obtain the compensation pressure P f As a result of the measurement, the formula is: When the underwater temperature and pressure gauge operates at a stable operating temperature, E is the calculation result of S5; When the underwater temperature and pressure gauge operates at an unstable operating temperature, E is the calculation result of S6.

2. The underwater temperature and pressure gauge pressure compensation method according to claim 1, characterized in that: In S1, the underwater temperature gauge includes a housing, and a temperature sensor and a pressure sensor are installed in the housing.

3. The underwater temperature and pressure gauge pressure compensation method according to claim 1, characterized in that: In S5, according to the real-time standard pressure P i Or the measured pressure P c The size of the partition fitting relative error E and the measured pressure P output by the pressure sensor c The relationship is: E=f(P c )=a*EXP(b*P c )+c; Where a, b, and c are parameters obtained by fitting.

4. The underwater temperature and pressure gauge pressure compensation method according to claim 1, characterized in that: In S6, observe the real-time calibration temperature T i , Real-time measurement of pressure P j , Real-time relative error E rel The relationship between the real-time calibration temperature T i Real-time pressure measurement P j The real-time relative error E rel In the case of i , Real-time measurement of pressure P j , Real-time relative error E rel Divided into different sections.

5. The underwater temperature and pressure gauge pressure compensation method according to claim 4, characterized in that: The multivariate linear fitting method is used to fit the relative error E of the segmented fitting and the measured pressure P output by the pressure sensor. c , and the calibration temperature T, and the formula for the relative error E of each section is obtained.

6. The underwater temperature and pressure gauge pressure compensation method according to claim 5, characterized in that: In S7, when the underwater temperature and pressure gauge operates at an unstable operating temperature, the relative error E is calculated using a corresponding formula according to the section to which the measured operating temperature value belongs.

7. The underwater temperature and pressure gauge pressure compensation method according to claim 6, characterized in that: The real-time calibration temperature T i , Real-time measurement of pressure P j , Real-time relative error E rel The segmented data were imported into Matlab for multivariate linear fitting.

8. The underwater temperature and pressure gauge pressure compensation method according to claim 1, characterized in that: In S6, In the formula, Q0-Q 20 is the fitting coefficient.

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