A device and method for simulating and testing the heating performance of submarine pipeline electric heating cables

Abstract

The present invention relates to a device and method for simulating the testing of the heating performance of an electric heating belt for a submarine pipeline, which comprises: a pressure chamber connected to an external temperature control device to control the temperature of the medium inside the pressure chamber; a pipeline test piece arranged in the pressure chamber for thermodynamic testing; an electric heating belt arranged on the pipeline test piece for heating; a temperature measuring module arranged in the pipeline test piece and the pressure chamber to transmit the detected temperature information to the external device; a first test pipeline connected to the pressure chamber through the pipeline test piece to simulate the normal transportation state; a second test pipeline connected to the pressure chamber through the pipeline test piece to simulate the stop transportation heating state; and in addition, a simulation of the unblocking state can be performed. The present invention can comprehensively test the various performances of the electric heating belt heating device when it is running under various working conditions in water. The present invention can be widely used in the field of petrochemical technology.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical industry, and in particular to a device and method for simulating and testing the heating performance of an electric heating belt for a submarine pipeline. Background Art

[0002] Nowadays, the demand for oil and gas is increasing, and conventional oil and gas resources are becoming increasingly depleted. Unconventional heavy oil resources have become the focus of attention. Offshore heavy oil resources are abundant, but there is a problem of difficulty in offshore heavy oil transportation. In order to cope with the difficulties of offshore extra-heavy oil and high-condensate oil transportation, prevent wax deposition, hydrate formation, and reduce flow safety risks, it is necessary to study heat tracing technology to increase and control the temperature of submarine pipelines.

[0003] The underwater crude oil pipeline wax blockage electric heating removal simulation device disclosed in the prior art includes a wax oil preparation and loading and unloading system, a direct electric heating system and a measurement system. The heating power supply is directly connected to the test pipe section to form a current loop, and a number of sensors for collecting information are installed on the test pipe section. Direct current is passed into the wax-blocked pipeline, and the underwater waxy crude oil pipeline is heated and unblocked by direct electric heating. The key data is recorded in real time by a combination of sensors, which can simulate the unblocking process and the pipeline shutdown and temperature drop process. However, since direct electric heating directly passes alternating current on the pipe wall, there is a risk of AC corrosion, which requires special design of anti-corrosion and regular inspection and maintenance.

[0004] Compared with direct electric heating technology, electric heating tape heating technology is more efficient, safer and more stable, and can achieve long-term stable operation. It is more suitable for the transportation of offshore oil and gas logistics and is a more effective solution. Since pipelines on the seabed face problems such as lower temperatures than on land and greater water pressure, the need to use electric heating tapes to heat submarine pipelines is more urgent and the relevant requirements are more stringent. However, in the field of petrochemicals, medium and long-distance electric heating tape heating pipelines are mostly used on land, and there are no cases of electric heating tape heating pipelines being used on the seabed, and there are no corresponding test devices and technologies to simulate and test the heating performance of submarine pipeline electric heating tapes, which cannot provide strong support for the application of electric heating tape heating technology on submarine pipelines. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a submarine pipeline electric heating tape heating performance simulation test device and method, which can comprehensively test the various performances of the electric heating tape heating device when operating under various working conditions in water.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a submarine pipeline electric heating belt heating performance simulation test device, which comprises:

[0007] A pressure chamber connected to an external temperature control device to control the temperature of the medium inside the pressure chamber;

[0008] A pipeline test piece, arranged in the pressure chamber, for conducting a thermodynamic test;

[0009] An electric heating tape is arranged on the pipeline test piece for heating;

[0010] A temperature measurement module is arranged in the pipeline test piece and the pressure chamber, and transmits the detected temperature information to an external device;

[0011] A first test pipeline is connected to the pressure chamber through the pipeline test piece to simulate the normal transportation state;

[0012] The second test pipeline is connected to the pressure chamber through the pipeline test piece to simulate the working condition of the stop-heating state.

[0013] Preferably, the pressure chamber comprises:

[0014] Base;

[0015] A cabin body, arranged on the base;

[0016] A first flange is provided at both ends of the cabin body to seal the cabin body; an opening is provided at the center of the first flange, and the pipeline test piece is passed through the opening and is arranged in the cabin body; a sealing treatment is performed between the opening and the pipeline test piece, and both ends of the pipeline test piece extend to the outside of the cabin body to form an extension portion;

[0017] A water inlet pipe, arranged on the first flange at one end of the cabin;

[0018] A drainage pipe is arranged at one side of the bottom of the cabin;

[0019] The water level in the cabin is adjusted by the water inlet pipe and the water outlet pipe.

[0020] Preferably, the pressure chamber further comprises a safety valve and a pressure gauge, and the safety valve and the pressure gauge are both arranged on the chamber body.

[0021] Preferably, the pipeline test piece comprises an inner tube, an insulation layer and an outer tube arranged in sequence from inside to outside;

[0022] The extension part of the pipeline test piece is connected to the three-way valve through the second flange respectively; the horizontal port part of each three-way valve is provided with a flange cover, and the vertical port part is used to connect with the first test pipeline and the second test pipeline.

[0023] Preferably, the temperature measurement module comprises:

[0024] A heating cable trough is arranged on the inner tube, and the electric heating tape is arranged in the heating cable trough, and the power can be continuously adjusted;

[0025] Temperature measuring optical fibers are arranged at intervals on the outer wall of the inner tube and are used to measure the temperature of the surface of the inner tube;

[0026] A thermocouple is arranged in a steel casing pre-arranged in the inner tube, and a temperature measuring probe of the thermocouple is in direct contact with the oil body, so as to directly test the temperature of the oil body transported in the pipeline test piece;

[0027] Heat flow meters are embedded at intervals on the outer surface of the thermal insulation layer to measure the heat there;

[0028] and a power source connected to the electric heating tape, the temperature measuring optical fiber, the thermocouple and the heat flow meter to supply power to each component.

[0029] Preferably, the first test pipeline comprises:

[0030] Oil storage tanks, used to store and supply oil;

[0031] A first valve, one end of which is connected to the oil storage tank via a pipeline;

[0032] A screw pump, the input end of which is connected to the other end of the first valve via the pipeline;

[0033] A second valve, one end of which is connected to the output end of the screw pump via the pipeline, and the other end of which is connected to the three-way valve on one end of the pipeline test piece via the pipeline;

[0034] A third valve, one end of which is connected to the three-way valve on the other end of the pipeline test piece through the pipeline;

[0035] and a fourth valve, one end of which is connected to the other end of the third valve via the pipeline, and the other end of the fourth valve is connected to the oil storage tank via the pipeline.

[0036] Preferably, a vent valve is connected in parallel on the pipeline between the third valve and the three-way valve on the other end of the pipeline test piece for venting or sampling.

[0037] Preferably, the second test pipeline comprises:

[0038] The screw pump;

[0039] a water storage tank for storing and supplying water and for cleaning the pipeline;

[0040] a fifth valve, one end of which is connected to the water storage tank via the pipeline, and the other end of which is connected to the input end of the screw pump via the pipeline;

[0041] a sixth valve, one end of which is connected to the output end of the screw pump via the pipeline;

[0042] a seventh valve, one end of which is connected to the other end of the sixth valve via the pipeline;

[0043] an eighth valve, one end of which is connected to the other end of the seventh valve via the pipeline, and the other end of the eighth valve is connected to the water storage tank via the pipeline;

[0044] And a centrifugal pump, one end of which is connected to the water storage tank via the pipeline, and the other end of the centrifugal pump is connected to the oil storage tank.

[0045] Preferably, the test device is used to simulate the unblocking state working condition, including: closing all valves; cooling the oil temperature in the pipeline test piece, adjusting the cable heating power, testing the change of the oil flow temperature field over time, and stopping the experiment when the oil temperature exceeds a preset value, completing the unblocking state working condition test.

[0046] A method for simulating the heating performance of a submarine pipeline electric heating cable, which is implemented based on the above device and includes a normal transportation test, a stop-transmission heating test and a blockage removal test;

[0047] Normal delivery test includes:

[0048] Close all valves and turn on the tank bottom heating;

[0049] Open the first valve, start the screw pump, and then open the second valve after waiting for a preset time;

[0050] Open the third valve and the fourth valve;

[0051] Adjust the screw pump to adjust the flow rate, and at the same time adjust the cable power and the water temperature of the pressure chamber;

[0052] After running for a preset time, the test piece reaches a thermal equilibrium state and records the data;

[0053] When the heat tracing test is stopped, it includes:

[0054] Turn on the bottom heating of the water tank, close the second valve, the third valve, the first valve, and the fourth valve under normal conveying conditions, open the fifth valve at the same time, and open the sixth valve after waiting for a preset time;

[0055] Open the seventh valve and the eighth valve;

[0056] By adjusting the cable heating power, the change of oil flow temperature field over time is recorded, and the experiment stops when the oil temperature exceeds the preset value;

[0057] After standing, use a centrifugal pump to pump the oil from the water tank back to the oil tank;

[0058] The unblocking test includes:

[0059] Close all valves;

[0060] Under the condition that the oil temperature of the test piece is fully cooled, the cable heating power is adjusted to test the change of the oil flow temperature field over time. When the oil temperature exceeds the preset value, the experiment is stopped and the unblocking state working condition test is completed.

[0061] The present invention adopts the above technical solution, which has the following advantages:

[0062] 1. The present invention is used for simulating the heating performance of submarine pipeline electric heating cables, filling the gap in the test equipment and technology for simulating the heating performance of submarine pipeline electric heating cables.

[0063] 2. The present invention is used for simulating the heating performance test of submarine pipeline electric heating tapes, and can comprehensively test the various performances of the electric heating tape heating device when operating under various working conditions in water, thereby reflecting the operating characteristics of the electric heating tape heating device in a marine environment.

[0064] 3. The present invention is used for simulating the heating performance test of the electric heating cable of the submarine pipeline, and the test device is simple, accurate and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 is a schematic diagram of the structure of a pressure chamber in one embodiment of the present invention;

[0066] Figure 2 is a schematic diagram of the structure of a pipeline test piece in one embodiment of the present invention;

[0067] Figure 3 It is a schematic diagram of a test flow in one embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] The present invention provides a submarine pipeline electric heating belt heating performance simulation test device, which is applied to the electric heating belt heating of submarine oil and gas pipelines; the experimental device includes a pressure chamber 1, a pipeline test piece 2, a power module, an electric heating belt, a temperature measurement module, a liquid storage tank, a temperature sensor, a pressure sensor, a flow meter, a pipeline, a valve, a tee, and a pump; the pressure chamber 1 can be connected to a temperature control device to control the temperature of the internal medium; the medium includes liquids such as water; the pipeline test piece 2 is immersed in the water inside the pressure chamber 1; the medium flowing inside the pipeline test piece 2 includes oil and gas, etc.; an electric heating belt is placed on the pipeline test piece 2 for heating, and the thermodynamic properties of the pipeline test piece 2 and the pipeline are tested by a temperature measuring optical fiber 14, a thermocouple 15 and a heat flow meter 16. The present invention can comprehensively test various performances of the electric heating belt heating device when it is running under various working conditions in water.

[0071] In one embodiment of the present invention, Figure 1 to Figure 3 As shown, a submarine pipeline electric heating cable heating performance simulation test device is provided, which includes:

[0072] The pressure chamber 1 is connected to an external temperature control device to control the temperature of the medium inside the pressure chamber 1;

[0073] The pipeline specimen 2 is arranged in the pressure chamber 1 and is used for thermodynamic testing;

[0074] An electric heating tape is arranged on the pipeline specimen 2 for heating;

[0075] The temperature measurement module is arranged in the pipeline test piece 2 and the pressure chamber 1, and transmits the detected temperature and other information to the external device;

[0076] The first test pipeline is connected to the pressure chamber 1 through the pipeline test piece 2 to simulate the normal transportation state;

[0077] The second test pipeline is connected to the pressure chamber 1 through the pipeline test piece 2 to simulate the working condition of the stop-heating state.

[0078] In this embodiment, the testing device provided by the present invention can also simulate the unblocking state.

[0079] In a preferred embodiment, Figure 1 As shown, the pressure chamber 1 comprises: a base 3 and a chamber body 4 arranged on the base 3;

[0080] The first flange 5 is respectively arranged at both ends of the cabin 4 to seal the cabin 4; an opening is arranged at the center of the first flange 5, and the pipeline test piece 2 is passed through the opening in the cabin 4, and the opening and the pipeline test piece 2 are sealed, and both ends of the pipeline test piece 2 extend to the outside of the cabin 4 to form an extension part 6;

[0081] A water inlet pipe 7 is provided on a first flange 5 at one end of the cabin 4;

[0082] A drainage pipe 8 is arranged at one side of the bottom of the cabin 4;

[0083] The water level in the cabin 4 is adjusted by the water inlet pipe 7 and the water outlet pipe 8 .

[0084] In the above embodiment, the pressure chamber 1 further includes a safety valve 9 and a pressure gauge 10 , and both the safety valve 9 and the pressure gauge 10 are arranged on the chamber body 4 .

[0085] In the above embodiment, if Figure 2 As shown, the pipeline test piece 2 includes an inner tube 201, an insulation layer 202, an inner and outer tube gap 203 and an outer tube 204 arranged in sequence from the inside to the outside; the extension portion 6 of the pipeline test piece 2 is connected to the three-way valve 11 through a second flange plate; the horizontal port portion of each three-way valve 11 is provided with a flange cover 12, and the vertical port portion is used to connect with the first test pipeline and the second test pipeline.

[0086] Among them, the pressure chamber 1 is sealed as a whole and can be connected to a temperature control device to control the temperature of the internal medium; the medium in the chamber 4 is water, and the water level can be adjusted through the water inlet pipe 7 and the water outlet pipe 8; the chamber 4 can be placed on a movable device through the base 3; the first flange 5 of the chamber 4 can be opened from the outside of the chamber 4, and the first flange 5 is specially treated to open a hole; the pipeline test piece 2 passes through the opening and extends outward to form an extension part 6, and the length of the extension part 6 is preferably 0.1 meters; the pipeline test piece 2 is immersed in the water inside the pressure chamber 1; the pipeline test piece 2 is connected to the three-way valve 11 by a flange connection, and the flow direction of the oil body is changed through the three-way valve 11, and the direction is changed from the direction of the pipeline to the direction perpendicular to the pipeline, but then returns to the pipeline through the bend.

[0087] In a preferred embodiment, the temperature measurement module includes:

[0088] A heating cable trough 13 is arranged on the inner tube 201, and an electric heating tape is arranged in the heating cable trough 13, and the power can be adjusted continuously;

[0089] The temperature measuring optical fibers 14 are arranged at intervals on the outer wall of the inner tube 201 and are used to measure the temperature of the surface of the inner tube 201;

[0090] Thermocouple 15 is arranged in a steel casing pre-arranged in the inner tube 201, and the temperature measuring probe of thermocouple 15 is in direct contact with the oil body, and is used to directly test the temperature of the oil body transported in the pipeline test piece 2;

[0091] The heat flow meter 16 is embedded at intervals on the outer surface of the insulation layer 202 to measure the heat there;

[0092] And a power supply, connected to the electric heating tape, the temperature measuring optical fiber 14, the thermocouple 15 and the heat flow meter 16, to supply power to each component.

[0093] Specifically, Figure 2 As shown, 11 holes are arranged on the second flange of the pipeline test piece 2, and steel sleeves are welded in the holes so that the measuring rod of the thermocouple 15 can be placed in the steel sleeve to prevent the measuring rod from sagging.

[0094] Six heating cable troughs 13 are provided, and six electric heating cables heat one pipe specimen 2 at the same time; wherein the electric heating cable comprises a heating core wire, core wire insulation, insulation sheath, braided layer and reinforced sheath layer arranged in sequence from the inside to the outside. A heating cable trough 13 is connected to the inner tube 201 of the pipe specimen 2, and the heating cable trough 13 is also located in the insulation layer 202 at the same time, and the electric heating cable is placed in the heating cable trough 13; the electric heating cable is connected to a power source, and the power can be continuously adjusted.

[0095] The temperature measurement module also includes an optical fiber temperature measurement host, which is connected to a power supply and uses an optical fiber temperature measurement method; there are a total of 8 temperature measurement optical fibers 14, which are evenly attached to the outer wall of the inner tube 201 at 45° intervals and can be used to measure the temperature of the surface of the inner tube 201.

[0096] The temperature measurement module also includes a thermocouple 15 temperature measurement host; the thermocouple 15 includes a temperature measuring probe and a measuring rod; there are 11 thermocouples 15 in total, and the measuring rod is placed in a steel casing to prevent the measuring rod from sagging; the temperature measuring probe is placed at 11 designated positions inside the pipeline specimen 2, and the temperature measuring probe is in direct contact with the oil body, and is used to directly test the temperature of the oil body transported in the pipeline specimen 2; the thermocouple 15 temperature measurement host is connected to a power supply.

[0097] The temperature measurement module also includes a heat flux meter 16 host; the heat flux meter 16 includes wires and patches; there are 4 patches in total, embedded on the outer surface of the insulation layer 202, evenly spaced at 90° intervals, to measure the heat here; the patches are connected to the heat flux meter 16 host through wires; the heat flux meter 16 host is connected to a power supply.

[0098] In a preferred embodiment, Figure 3 As shown, the first test pipeline includes:

[0099] An oil storage tank 17, used for storing and supplying oil;

[0100] A first valve 18, one end of which is connected to the oil storage tank 17 via a pipeline;

[0101] The screw pump 19, the input end of which is connected to the other end of the first valve 18 via a pipeline;

[0102] A second valve 20, one end of which is connected to the output end of the screw pump 19 via a pipeline, and the other end of which is connected to the three-way valve 11 on one end of the pipeline test piece 2 via a pipeline;

[0103] A third valve 21, one end of which is connected to the three-way valve 11 on the other end of the pipeline test piece 2 through a pipeline;

[0104] And a fourth valve 22, one end of which is connected to the other end of the third valve 21 via a pipeline, and the other end of the fourth valve 22 is connected to the oil storage tank 17 via a pipeline.

[0105] The second test line includes a screw pump 19; and

[0106] A water storage tank 23, used for storing and supplying water and cleaning the pipeline;

[0107] A fifth valve 24, one end of which is connected to the water storage tank 23 via a pipeline, and the other end of which is connected to the input end of the screw pump 19 via a pipeline;

[0108] A sixth valve 25, one end of which is connected to the output end of the screw pump 19 via a pipeline;

[0109] A seventh valve 26, one end of which is connected to the other end of the sixth valve 25 via a pipeline;

[0110] An eighth valve 27, one end of which is connected to the other end of the seventh valve 26 via a pipeline, and the other end of the eighth valve 27 is connected to the water storage tank 23 via a pipeline;

[0111] One end of the centrifugal pump 28 is connected to the water storage tank 23 via a pipeline, and the other end of the centrifugal pump 28 is connected to the oil storage tank 17 .

[0112] In the above embodiment, a temperature sensor T and a pressure sensor P are provided on the pipeline at the other end of the second valve 20 and the pipeline at the other end of the third valve 21;

[0113] A pressure sensor P is provided on the pipeline at the input end of the screw pump 19;

[0114] A flow meter 29 is provided on the pipeline at the output end of the screw pump 19 .

[0115] In the above embodiment, a vent valve 30 is connected in parallel on the pipeline between the third valve 21 and the three-way valve 11 on the other end of the pipeline test piece 2 for venting or sampling.

[0116] Specifically, the oil storage tank 17 includes a tank body, a valve and a heating coil, and the temperature can be controlled by the heating coil. The oil storage tank 17 is connected to a pipeline and a centrifugal pump 28 to store and supply oil. The water storage tank 23 includes a tank body, a valve and a heating coil, and the temperature can be controlled by the heating coil. The water storage tank 23 is connected to a pipeline and a centrifugal pump 28 to store and supply water, and then the pipeline can be cleaned. The centrifugal pump 28 connects the oil storage tank 17 and the water storage tank 23; the screw pump 19 is connected to the pipeline to provide a delivery pressure for the pipeline.

[0117] The temperature sensor T is connected to the pipeline to test the temperature of the pipeline; the pressure sensor P is connected to the pipeline to test the pressure of the pipeline; the flow meter 29 is connected to the pipeline to test the flow of the pipeline. The valve is connected to the pipeline to control the flow of the fluid medium in the corresponding pipeline.

[0118] In this embodiment, the working conditions include normal conveying state, stop conveying and heating state and unblocking state; the working processes are as follows:

[0119] The normal delivery test includes the following steps:

[0120] Step 1: Close all valves and turn on the bottom heating of the oil tank;

[0121] Step 2: Open the first valve 18, start the screw pump 19, and wait for a preset time before opening the second valve 20; in this embodiment, the preset time is preferably 5 to 10 seconds.

[0122] Step 3, opening the third valve 21 and the fourth valve 22;

[0123] Step 4: Adjust the screw pump to adjust the flow rate, and at the same time adjust the cable power and the water temperature of the pressure chamber 1;

[0124] Step 5: After the test piece reaches a thermal equilibrium state after running for a preset time, record the data;

[0125] Step 6. Repeat steps 4 to 5.

[0126] The following steps are included in the heat tracing test:

[0127] Step 1: Turn on the bottom heating of the water tank, close the second valve 20, the third valve 21, the first valve 18, and the fourth valve 22 under normal conveying conditions, open the fifth valve 24 at the same time, and open the sixth valve 25 after waiting for a preset time; in this embodiment, the preset time is preferably: 5 to 10 seconds.

[0128] Step 2: Open the seventh valve 26 and the eighth valve 27;

[0129] Step 3: Adjust the cable heating power and record the change of oil flow temperature field over time. When the oil temperature exceeds 60℃, stop the experiment.

[0130] Step 4: After standing for a period of time, the oil is pumped back from the water tank to the oil tank using a centrifugal pump 28;

[0131] Step 5. Repeat steps 1 to 4.

[0132] The unblocking test includes the following steps:

[0133] Step 1: Close all valves;

[0134] Step 2: When the oil temperature of the test piece is fully cooled, adjust the cable heating power to test the change of the oil flow temperature field over time. When the oil temperature exceeds 60°C, stop the experiment.

[0135] Step 3: Repeat step 2 to complete the unblocking state working condition test;

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating the heating performance of submarine pipeline electric heating cables, characterized in that: This method is implemented based on a submarine pipeline electric heating cable heating performance simulation test device. The testing device comprises: A pressure chamber connected to an external temperature control device to control the temperature of the medium inside the pressure chamber; A pipeline test piece, arranged in the pressure chamber, for conducting a thermodynamic test; An electric heating tape is arranged on the pipeline test piece for heating; A temperature measurement module is arranged in the pipeline test piece and the pressure chamber, and transmits the detected temperature information to an external device; A first test pipeline is connected to the pressure chamber through the pipeline test piece to simulate the normal transportation state; A second test pipeline is connected to the pressure chamber through the pipeline test piece to simulate the working condition of the stop-heating state; The first test pipeline comprises: Oil storage tanks, used to store and supply oil; A first valve, one end of which is connected to the oil storage tank via a pipeline; A screw pump, the input end of which is connected to the other end of the first valve via the pipeline; A second valve, one end of which is connected to the output end of the screw pump via the pipeline, and the other end of which is connected to the three-way valve on one end of the pipeline test piece via the pipeline; A third valve, one end of which is connected to the three-way valve on the other end of the pipeline test piece through the pipeline; and a fourth valve, one end of which is connected to the other end of the third valve via the pipeline, and the other end of the fourth valve is connected to the oil storage tank via the pipeline; The second test pipeline comprises: The screw pump; a water storage tank for storing and supplying water and for cleaning the pipeline; a fifth valve, one end of which is connected to the water storage tank via the pipeline, and the other end of which is connected to the input end of the screw pump via the pipeline; a sixth valve, one end of which is connected to the output end of the screw pump via the pipeline; a seventh valve, one end of which is connected to the other end of the sixth valve via the pipeline; an eighth valve, one end of which is connected to the other end of the seventh valve via the pipeline, and the other end of the eighth valve is connected to the water storage tank via the pipeline; and a centrifugal pump, one end of which is connected to the water storage tank via the pipeline, and the other end of which is connected to the oil storage tank; The test method includes normal delivery test, stop delivery heat tracing test and blockage removal test; Normal delivery test includes: Close all valves and turn on the tank bottom heating; Open the first valve, start the screw pump, and then open the second valve after waiting for a preset time; Open the third valve and the fourth valve; Adjust the screw pump to adjust the flow rate, and at the same time adjust the cable power and the water temperature of the pressure chamber; After running for a preset time, the test piece reaches a thermal equilibrium state and records the data; When the heat tracing test is stopped, it includes: Turn on the bottom heating of the water tank, close the second valve, the third valve, the first valve, and the fourth valve under normal conveying conditions, open the fifth valve at the same time, and open the sixth valve after waiting for a preset time; Open the seventh valve and the eighth valve; By adjusting the cable heating power, the change of oil flow temperature field over time is recorded, and the experiment stops when the oil temperature exceeds the preset value; After standing, use a centrifugal pump to pump the oil from the water tank back to the oil tank; The unblocking test includes: Close all valves; Under the condition that the oil temperature of the test piece is fully cooled, the cable heating power is adjusted to test the change of the oil flow temperature field over time. When the oil temperature exceeds the preset value, the experiment is stopped and the unblocking state working condition test is completed.

2. The testing method according to claim 1, characterized in that: The pressure chamber comprises: Base; A cabin body, arranged on the base; A first flange is provided at both ends of the cabin body to seal the cabin body; an opening is provided at the center of the first flange, and the pipeline test piece is passed through the opening and is arranged in the cabin body; a sealing treatment is performed between the opening and the pipeline test piece, and both ends of the pipeline test piece extend to the outside of the cabin body to form an extension portion; A water inlet pipe, arranged on the first flange at one end of the cabin; A drainage pipe is arranged at one side of the bottom of the cabin; The water level in the cabin is adjusted by the water inlet pipe and the water outlet pipe.

3. The testing method according to claim 2, characterized in that: The pressure cabin also includes a safety valve and a pressure gauge, and the safety valve and the pressure gauge are both arranged on the cabin body.

4. The testing method according to claim 2, characterized in that: The pipeline test piece includes an inner pipe, an insulation layer and an outer pipe arranged in sequence from the inside to the outside; The extension part of the pipeline test piece is connected to the three-way valve through the second flange respectively; the horizontal port part of each three-way valve is provided with a flange cover, and the vertical port part is used to connect with the first test pipeline and the second test pipeline.

5. The testing method according to claim 4, characterized in that: The temperature measurement module comprises: A heating cable trough is arranged on the inner tube, and the electric heating tape is arranged in the heating cable trough, and the power can be continuously adjusted; Temperature measuring optical fibers are arranged at intervals on the outer wall of the inner tube and are used to measure the temperature of the surface of the inner tube; A thermocouple is arranged in a steel casing pre-arranged in the inner tube, and a temperature measuring probe of the thermocouple is in direct contact with the oil body, so as to directly test the temperature of the oil body transported in the pipeline test piece; Heat flow meters are embedded at intervals on the outer surface of the thermal insulation layer to measure the heat there; and a power source connected to the electric heating tape, the temperature measuring optical fiber, the thermocouple and the heat flow meter to supply power to each component.

6. The testing method according to claim 1, characterized in that: A vent valve is connected in parallel on the pipeline between the third valve and the three-way valve on the other end of the pipeline test piece for venting or sampling.

7. The testing method according to claim 1, characterized in that: The test device is used to simulate the unblocking state working condition, including: closing all valves; cooling the oil temperature in the pipeline test piece, adjusting the cable heating power, testing the change of the oil flow temperature field over time, and stopping the experiment when the oil temperature exceeds a preset value, completing the unblocking state working condition test.

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