Device and method for testing fluid heat conductivity coefficient of non-metal composite pipe

Abstract

The invention belongs to the technical field of petroleum non-metal composite pipe performance testing, and particularly relates to a non-metal composite pipe fluid heat conductivity coefficient testing device and a testing method. A non-metal composite pipe fluid heat conductivity coefficient testing device comprises a non-metal composite pipe sample, a temperature control module and a data acquisition module, the non-metal composite pipe sample comprises a non-metal testing pipe sample, and a through hole is formed in the middle of a blocking plate at the upper end of the non-metal testing pipe sample; the temperature control module comprises a digital display constant temperature controller and a temperature sensing heating rod, the top of the temperature sensing heating rod is provided with a mounting cap, the mounting cap is hermetically connected with the through hole, the data acquisition module comprises a temperature recorder, a thermocouple I and a plurality of thermocouples II, and the thermocouples II are laid on the outer surface of the non-metal test tube sample. The device can be used for detecting a real composite pipe, simulating the temperature collected and conveyed on the site of an oil field, heating and controlling the temperature of fluid in the pipe, and meeting the actual requirements of monitoring and evaluating the heat-conducting property of the nonmetal pipe for the oil field.

Description

Technical Field

[0001] The present invention belongs to the technical field of performance testing of non-metallic composite pipes for oil, and particularly relates to a testing device and a testing method for the fluid thermal conductivity of non-metallic composite pipes. Background Art

[0002] During the exploitation and transportation of crude oil in oilfields, a large amount of heat is dissipated, resulting in waste of energy. In severe cases, it may even cause economic losses and safety accidents. Therefore, improving the pipeline heat insulation technology level is an important measure to ensure the safe exploitation, collection, transportation, energy conservation, consumption reduction, and efficiency increase of oil and gas in oilfields.

[0003] Currently, in enterprises, tests are only carried out on sheets, and there is no dedicated equipment for detecting the whole physical pipe. Through retrieval, it is found that Chinese invention CN103267774A discloses a testing instrument and a testing method for the thermal conductivity of pipes with hyperbolic reality. However, in the exploitation and transportation of oil and gas in oilfields, heating and temperature control are often required, while the fluid medium in the pipes of this invention is 0°C brine, which cannot be heated and temperature controlled, and can only be tested under room temperature conditions (23 - 25°C); moreover, this invention tests the change in temperature inside the composite pipe, which belongs to heat absorption, while the working conditions of the oilfield site environment are heat dissipation. Therefore, testing the change in temperature inside the composite pipe will cause great errors in the evaluation of the thermal conductivity of non-metallic pipes used in oilfields. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a testing device and a testing method for the fluid thermal conductivity of non-metallic composite pipes. This device can detect the whole physical pipe of the composite pipe and simulate the temperature of oilfield on-site exploitation, collection, and transportation to heat and control the temperature of the fluid inside the pipe. Thus, it can meet the actual needs of enterprises for monitoring and evaluating the thermal conductivity of non-metallic pipes used in oilfields.

[0005] The technical solution of the present invention lies in: a test device for the fluid thermal conductivity of a non-metallic composite pipe, including a non-metallic composite pipe sample, a temperature control module and a data acquisition module. The non-metallic composite pipe sample includes a non-metallic test pipe sample, which is vertically placed. The upper and lower ends of the non-metallic test pipe sample are respectively sealed with plug plates. A through hole is provided in the middle position of the plug plate at the upper end of the non-metallic test pipe sample. The temperature control module includes a digital display constant temperature controller and a temperature sensing heating rod. An installation cap is provided at the top of the temperature sensing heating rod. After the temperature sensing heating rod extends into the through hole of the upper end plug plate of the non-metallic test pipe sample, the installation cap is hermetically connected to the through hole. The digital display constant temperature controller is electrically connected to the temperature sensing heating rod. The data acquisition module includes a temperature recorder, a thermocouple I and multiple thermocouples II. The temperature recorder is electrically connected to the thermocouple I and the thermocouple II. The thermocouple II is laid on the outer surface of the non-metallic test pipe sample, and the thermocouple I is located outside the non-metallic test pipe sample. A test fluid medium is provided inside the non-metallic test pipe sample.

[0006] A touch screen is provided on the digital display constant temperature controller, and the temperature sensing heating rod is regulated and heated through the touch screen.

[0007] Internal threads are provided in the through hole of the upper end plug plate of the non-metallic test pipe sample, and external threads matching the internal threads are provided on the outer surface of the installation cap at the top of the temperature sensing heating rod.

[0008] The length of the non-metallic test pipe sample is 0.5 - 1 m. The thermocouple II is evenly laid on the outer surface of the non-metallic test pipe sample from top to bottom, and the laying spacing of the thermocouple II is 0.1 - 0.15 m.

[0009] The test fluid medium includes one of crude oil, water or an oil-water mixture, and the oil-water mixture is a mixture of crude oil and water with any volume ratio.

[0010] A test method for the fluid thermal conductivity of a non-metallic composite pipe, using the above-mentioned test device for the fluid thermal conductivity of a non-metallic composite pipe, includes the following steps: S1: Vertically place the non-metallic test pipe sample, and pour the test fluid medium into the non-metallic test pipe sample whose lower end has been sealed with a plug plate according to the test requirements. The upper end of the non-metallic test pipe sample is sealed with a plug plate provided with a through hole. S2: Insert the temperature sensing heating rod into the through hole and seal it. The digital display constant temperature controller is electrically connected to the temperature sensing heating rod. Enter the designed heating temperature on the touch screen interface, and heat the test fluid medium in the non-metallic test pipe sample to the corresponding temperature and keep it constant through the temperature sensing heating rod. S3: After the temperature inside the non-metallic test tube sample becomes constant, place the thermocouple Ⅰ connected to the temperature recorder in the external air of the non-metallic test tube sample to measure the environmental temperature, and evenly lay the thermocouple Ⅱ on the outer surface of the non-metallic test tube sample from top to bottom; set the acquisition frequency on the touch screen of the temperature recorder and save the corresponding data; S4: Through the time and temperature change data recorded in step S3, calculate the thermal conductivity of the non-metallic composite pipe. The determination formula for the thermal conductivity is: (1) In the formula, T R is the average temperature of the outer wall of the non-metallic test tube sample, in °C; T E is the environmental temperature, in °C; T H is the heating temperature, in °C; r 2 is the outer tube radius of the non-metallic test tube sample, in m; r 1 is the inner tube radius of the non-metallic test tube sample, in m; λ is the apparent thermal conductivity of the heat-insulating oil pipe, in W / (m·K).

[0011] The technical effects of the present invention are as follows: 1. Through the non-metallic composite pipe sample, the temperature control module and the data acquisition module, the present invention can detect the whole pipe of the composite pipe, simulate the temperature of oilfield field production, transportation and gathering, heat and control the temperature of the fluid in the pipe. The device is simply and reasonably designed, easy to operate, has high test accuracy and low cost, and is suitable for industrial production applications; 2. The present invention heats and keeps the temperature constant of the fluid medium in the non-metallic test tube sample through a digital display constant temperature control machine, so as to simulate the working condition temperature of the non-metallic composite pipe in the oilfield field, making the test results more accurate and persuasive; 3. The plug plate at the upper end of the non-metallic test tube sample of the present invention is provided with a through hole with internal threads, which can be tightly connected to the mounting cap with external threads on the temperature sensing heating rod. During the test, there is no need to separately replace the sealing plug on the temperature sensing heating rod according to the composite pipes of different specifications and sizes, so it is applicable to the test of composite pipes of different specifications and sizes, reducing the manufacturing cost.

[0012] The following will be further described with reference to the drawings. Brief Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of a device for testing the fluid thermal conductivity of a non-metallic composite pipe according to an embodiment of the present invention.

[0014] Reference numerals: 1 - digital display constant temperature control machine; 2 - touch screen; 3 - temperature sensing heating rod; 4 - non-metallic test tube sample; 5 - thermocouple Ⅰ; 6 - thermocouple Ⅱ; 7 - temperature recorder; 8 - touch screen. Detailed Embodiments Embodiment 1

[0015] AsFigure 1 As shown in the figure, a test device for the thermal conductivity of fluids in non-metallic composite pipes includes a non-metallic composite pipe sample, a temperature control module, and a data acquisition module. The non-metallic composite pipe sample includes a non-metallic test pipe sample 4, which is vertically placed. The upper and lower ends of the non-metallic test pipe sample 4 are sealed with plug plates. A through hole is provided in the middle of the plug plate at the upper end of the non-metallic test pipe sample 4. The temperature control module includes a digital display constant temperature controller 1 and a temperature sensing heating rod 2. The top of the temperature sensing heating rod 2 is provided with a mounting cap. After the temperature sensing heating rod 2 extends into the through hole of the upper end plug plate of the non-metallic test pipe sample 4, the mounting cap is hermetically connected to the through hole. The digital display constant temperature controller 1 is electrically connected to the temperature sensing heating rod 2. The data acquisition module includes a temperature recorder 7, a thermocouple I 5, and multiple thermocouples II 6. The temperature recorder 7 is electrically connected to the thermocouple I 5 and the thermocouple II 6. The thermocouple II 6 is laid on the outer surface of the non-metallic test pipe sample 4, and the thermocouple I 5 is located outside the non-metallic test pipe sample 4. A test fluid medium is provided inside the non-metallic test pipe sample 4.

[0016] During actual use, in the present invention, the non-metallic test pipe sample 4 is vertically placed. According to the test requirements, the test fluid medium is poured into the non-metallic test pipe sample 4 whose lower end has been sealed with a plug plate, and the upper end of the non-metallic test pipe sample 4 is sealed with a plug plate provided with a through hole; the temperature sensing heating rod 2 is inserted into the through hole and sealed, and the digital display constant temperature controller 1 is electrically connected to the temperature sensing heating rod 2. The test fluid medium inside the non-metallic test pipe sample 4 is heated to the corresponding temperature and kept constant through the temperature sensing heating rod 2; After the temperature inside the non-metallic test pipe sample 4 is constant, the thermocouple I 5 connected to the temperature recorder 7 is placed in the external air of the non-metallic test pipe sample 4 to measure the test environment temperature, and the thermocouple II 6 is evenly laid on the outer surface of the non-metallic test pipe sample 4 from top to bottom; the acquisition frequency is set on the touch screen of the temperature recorder 7 and the corresponding data is saved; through the time and temperature change data recorded in step S3, the thermal conductivity of the non-metallic composite pipe is calculated. Through the non-metallic composite pipe sample, the temperature control module, and the data acquisition module, the present invention can detect the entire physical pipe of the composite pipe, simulate the temperature of oilfield field production, transportation, heating, and temperature control of the fluid inside the pipe. The device is simply and reasonably designed, easy to operate, has high test accuracy, and low cost, and is suitable for industrial production applications. Example 2

[0017] Preferably, on the basis of Example 1, in this embodiment, a touch screen 8 is provided on the digital display constant temperature controller 1, and the temperature sensing heating rod 2 is regulated and heated through the touch screen 8.

[0018] During actual use, the designed heating temperature is input on the touch screen 8 interface of the present invention, and the test fluid medium in the non-metallic test tube sample 4 is heated to the corresponding temperature and kept constant by the temperature-sensing heating rod 2. Example 3

[0019] Preferably, on the basis of Example 1 or Example 2, in this embodiment, an internal thread is provided in the through hole of the upper end plug of the non-metallic test tube sample 4, and an external thread matching the internal thread is provided on the outer surface of the mounting cap at the top of the temperature-sensing heating rod 2.

[0020] During actual use, an internal thread is provided in the through hole of the upper end plug of the non-metallic test tube sample 4 of the present invention, and an external thread matching the internal thread is provided on the outer surface of the mounting cap at the top of the temperature-sensing heating rod 2, which facilitates the sealed connection between the non-metallic test tube sample 4 and the temperature-sensing heating rod 2. Example 4

[0021] Preferably, on the basis of Example 1 or Example 3, in this embodiment, the length of the non-metallic test tube sample 4 is 0.5 - 1 m, the thermocouple II 6 is evenly laid on the outer surface of the non-metallic test tube sample 4 from top to bottom, and the laying spacing of the thermocouple II 6 is 0.1 - 0.15 m.

[0022] During actual use, the thermocouple II 6 of the present invention is evenly laid on the outer surface of the non-metallic test tube sample 4 from top to bottom, which can measure the surface temperature change of the non-metallic test tube sample 4. Example 5

[0023] Preferably, on the basis of Example 1 or Example 4, in this embodiment, the test fluid medium includes one of crude oil, water or an oil-water mixture, and the oil-water mixture is a mixture of crude oil and water with any volume ratio.

[0024] During actual use, the test fluid medium of the present invention includes one of crude oil, water or an oil-water mixture, and the oil-water mixture is a mixture of crude oil and water with any volume ratio, which can simulate the transportation medium in the actual pipeline transportation process of the oilfield. Example 6

[0025] A test method for the fluid thermal conductivity of a non-metallic composite pipe uses a test device for the fluid thermal conductivity of a non-metallic composite pipe as described above, and includes the following steps: S1: Vertically place the non-metallic test tube sample 4, and pour the test fluid medium into the non-metallic test tube sample 4 whose lower end has been sealed with a plug according to the test requirements. The upper end of the non-metallic test tube sample 4 is sealed with a plug provided with a through hole. S2: Insert the temperature-sensing heating rod 2 into the through hole and seal it. The digital display constant temperature controller 1 is electrically connected to the temperature-sensing heating rod 2. Input the designed heating temperature on the touch screen 8 interface, and heat the test fluid medium in the non-metallic test tube sample 4 to the corresponding temperature through the temperature-sensing heating rod 2 and keep it constant. S3: After the temperature in the non-metallic test tube sample 4 is constant, place the thermocouple Ⅰ5 connected to the temperature recorder 7 in the external air of the non-metallic test tube sample 4 to measure the ambient temperature, and evenly lay the thermocouple Ⅱ6 from top to bottom on the outer surface of the non-metallic test tube sample 4; Set the acquisition frequency on the touch screen of the temperature recorder 7 and save the corresponding data. S4: Through the time and temperature change data recorded in step S3, calculate the thermal conductivity of the non-metallic composite pipe. The determination formula for the thermal conductivity is: (1) In the formula, T R is the average temperature of the outer wall of the non-metallic test tube sample, °C; T E is the ambient temperature, °C; T H is the heating temperature, °C; r 2 is the outer radius of the non-metallic test tube sample, m; r 1 is the inner radius of the non-metallic test tube sample, m; λ is the apparent thermal conductivity of the heat-insulating oil pipe, W / (m·K).

[0026] As mentioned above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A test device for the thermal conductivity of fluids in non-metallic composite pipes, characterized in that: It includes a non-metallic composite pipe sample, a temperature control module and a data acquisition module. The non-metallic composite pipe sample includes a non-metallic test pipe sample (4). The non-metallic test pipe sample (4) is placed vertically. The upper and lower ends of the non-metallic test pipe sample (4) are sealed with plug plates. A through hole is provided in the middle of the plug plate at the upper end of the non-metallic test pipe sample (4). The temperature control module includes a digital display constant temperature controller (1) and a temperature sensing heating rod (2). An installation cap is provided at the top of the temperature sensing heating rod (2). After the temperature sensing heating rod (2) extends into the through hole of the upper end plug plate of the non-metallic test pipe sample (4), the installation cap is hermetically connected to the through hole. The digital display constant temperature controller (1) is electrically connected to the temperature sensing heating rod (2). The data acquisition module includes a temperature recorder (7), a thermocouple I (5) and multiple thermocouples II (6). The temperature recorder (7) is electrically connected to the thermocouple I (5) and the thermocouple II (6). The thermocouple II (6) is laid on the outer surface of the non-metallic test pipe sample (4). The thermocouple I (5) is located outside the non-metallic test pipe sample (4). A test fluid medium is provided inside the non-metallic test pipe sample (4).

2. The test device for the thermal conductivity of fluids in non-metallic composite pipes according to claim 1, characterized in that: A touch screen (8) is provided on the digital display constant temperature controller (1), and the temperature sensing heating rod (2) is regulated and heated through the touch screen (8).

3. The test device for the thermal conductivity of fluids in non-metallic composite pipes according to claim 1, characterized in that: Internal threads are provided in the through hole of the upper end plug plate of the non-metallic test pipe sample (4), and external threads matching the internal threads are provided on the outer surface of the installation cap at the top of the temperature sensing heating rod (2).

4. The test device for the thermal conductivity of fluids in non-metallic composite pipes according to claim 1, characterized in that: The length of the non-metallic test pipe sample (4) is 0.5 - 1 m. The thermocouple II (6) is evenly laid on the outer surface of the non-metallic test pipe sample (4) from top to bottom, and the laying spacing of the thermocouple II (6) is 0.1 - 0.15 m.

5. The test device for the thermal conductivity of fluids in non-metallic composite pipes according to claim 1, characterized in that: The test fluid medium includes one of crude oil, water or an oil-water mixture. The oil-water mixture is a mixture of crude oil and water in any volume ratio.

6. A test method for the thermal conductivity of fluids in non-metallic composite pipes, using the test device for the thermal conductivity of fluids in non-metallic composite pipes according to claim 1, characterized in that: It includes the following steps: S1: Vertically place the non-metallic test pipe sample (4). According to the test requirements, pour the test fluid medium into the non-metallic test pipe sample (4) whose lower end has been sealed with a plug plate. The upper end of the non-metallic test pipe sample (4) is sealed with a plug plate provided with a through hole. S2: Insert the temperature-sensing heating rod (2) into the through-hole and seal it. The digital display constant temperature controller (1) is electrically connected to the temperature-sensing heating rod (2). Input the designed heating temperature on the touch screen (8) interface, and heat the test fluid medium in the non-metallic test tube sample (4) to the corresponding temperature and keep it constant through the temperature-sensing heating rod (2). S3: After the temperature in the non-metallic test tube sample (4) is constant, place the thermocouple Ⅰ (5) connected to the temperature recorder (7) in the external air of the non-metallic test tube sample (4) to measure the ambient temperature, and evenly lay the thermocouple Ⅱ (6) on the outer surface of the non-metallic test tube sample (4) from top to bottom. Set the acquisition frequency on the touch screen of the temperature recorder (7) and save the corresponding data. S4: Through the time and temperature change data recorded in step S3, calculate the thermal conductivity of the non-metallic composite pipe. The determination formula for the thermal conductivity is as follows: （1） Where, T R is the average temperature of the outer wall of the non-metallic test tube sample, °C; T E is the ambient temperature, °C; T H is the heating temperature, °C; r 2 is the outer tube radius of the non-metallic test tube sample, m; r 1 is the inner tube radius of the non-metallic test tube sample, m; λ is the apparent thermal conductivity of the heat-insulated tubing, W / (m·K).

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