A bimetallic composite pipe multi-medium coupling water pressure testing system and testing method

Abstract

This invention discloses a multi-media coupled hydraulic pressure testing system and method for bimetallic composite pipes, relating to the field of hydraulic pressure testing technology. The system comprises a protective mechanism and a pressurizing mechanism; the protective mechanism includes a heat preservation box and a blast protection box; the pressurizing mechanism includes a clean water tank, a metered plunger pump, and an injection tube. The system provided by this invention can withstand long-term hydraulic pressure and blast testing of bimetallic composite pipes under oil-gas mixing, high temperature, and high pressure conditions, and can automatically record all temperature and pressure change data during the test.

Description

Technical Field

[0001] The present invention relates to the technical field of water pressure testing, and in particular to a bimetallic composite pipe multi-medium coupling water pressure testing system and a testing method. Background Art

[0002] At present, the existing water pressure testing of bimetallic composite pipes only performs water pressure testing on the inside of the sample at room temperature to check the pressure bearing capacity of the sample, which cannot fully simulate the actual working conditions of the bimetallic composite pipes in actual use.

[0003] Bimetallic composite pipes used in highly corrosive environments of oil and gas fields should be tested under conditions where they can maintain high temperature (100-120 degrees Celsius), high pressure (0-120MPa), oil (oilfield water, diesel, crude oil), gas (natural gas) and other media mixtures for a long time. The water pressure test data obtained will be more accurate and can better reflect the true performance parameters of bimetallic composite pipes in long-term service. As of now, no relevant testing equipment has appeared on the market. Summary of the Invention

[0004] Technical problems to be solved

[0005] In order to address the lack of water pressure testing and blasting testing for bimetallic composite pipes under real working conditions of high temperature, high pressure, and mixed media such as oil, natural gas, and acid, the present invention provides a multi-media coupled water pressure testing system and testing method for bimetallic composite pipes; the system can meet the needs of long-term water pressure testing and blasting testing of bimetallic composite pipes under oil and gas mixing, high temperature and high pressure conditions, and can automatically record all temperature and pressure change data during the test process.

[0006] Technical Solution

[0007] In order to achieve the above-mentioned object, the present invention provides a bimetallic composite pipe multi-media coupling water pressure testing system in a first aspect, characterized in that it includes a protection mechanism and a pressure boosting mechanism;

[0008] The protection mechanism includes:

[0009] The insulated box has a plurality of support beams arranged horizontally inside;

[0010] A blasting protection box is arranged in the thermal insulation box and erected on the plurality of support beams, wherein a bracket for placing the bimetallic composite pipe is provided in the blasting protection box;

[0011] The boosting mechanism comprises:

[0012] A clean water tank, the water outlet of which is connected to the interior of the blasting protection box via a pipe that sequentially passes through the heat preservation box and the blasting protection box;

[0013] A quantitative plunger pump is provided on the pipe body between the clean water tank and the insulation box;

[0014] An injection pipe is connected to the pipe body between the quantitative plunger pump and the heat preservation box, and a manual stop valve for the injection port is provided on the injection pipe;

[0015] An air-controlled shut-off valve and an air-controlled pressure relief valve are sequentially provided on the pipe body between the connection point between the injection pipe and the pipe body and the heat preservation box;

[0016] A first one-way valve is provided between the quantitative plunger pump and the connection between the injection tube and the tube body;

[0017] A manual stop valve is also provided on the pipe body inside the heat preservation box and outside the explosion protection box.

[0018] Preferably, the boosting mechanism further comprises:

[0019] A pressure sensor is provided on the pipe body between the quantitative plunger pump and the first one-way valve; one side of the pressure sensor is also connected to a servo pressure regulating valve;

[0020] The air compressor is connected to an air control cabinet, and the air control cabinet is connected to a servo pressure regulating valve, the air-controlled stop valve and the air-controlled pressure relief valve.

[0021] Preferably, the boosting mechanism further comprises:

[0022] a single-cylinder servo booster pump, arranged in parallel with the quantitative plunger pump, with its input end connected to the clean water tank and its output end connected to the pipe body, and its connection point is located between the first one-way valve and the connection point between the injection pipe and the pipe body;

[0023] A shock-resistant and corrosion-resistant pressure gauge is arranged on the pipe body between the air-controlled pressure relief valve and the heat preservation box.

[0024] Preferably, a second one-way valve is provided on the pipe body between the connecting point between the single-cylinder servo booster pump and the pipe body and the connecting point between the injection pipe and the pipe body.

[0025] Preferably, a cover plate is provided on the top of the thermal insulation box, and the cover plate is slidably connected to the top ends of the two side walls of the thermal insulation box via slide rails.

[0026] Preferably, the thermal insulation box is further provided with a liquid level sensor, a temperature sensor, a circulation pump and a heater.

[0027] Preferably, the tube body penetrates the blasting protection box by providing a first pipe joint and a second pipe joint at opposite positions on the inner side and the outer side of one end of the blasting protection box, respectively, and the first pipe joint and the second pipe joint penetrate the blasting protection box to communicate with each other.

[0028] Preferably, the tube body passes through the insulation box by providing a third pipe joint and a fourth pipe joint at relative positions on the inner side and the outer side of one end of the insulation box, respectively, and the third pipe joint and the fourth pipe joint pass through the insulation box to communicate with each other.

[0029] A second aspect of the present invention provides a method for multi-media coupled water pressure testing of a bimetallic composite pipe, using the above-mentioned multi-media coupled water pressure testing system for a bimetallic composite pipe, comprising the following steps:

[0030] Injecting a test medium into the bimetallic composite pipe sample and placing it on a bracket in the explosion protection box; wherein the end of the bimetallic composite pipe sample is provided with a high-pressure connector with a valve body;

[0031] Close the manual stop valve, connect the high-pressure joint to the end of the pipe connected to the inside of the explosion protection box, open the valve on the high-pressure joint, add clean water to the explosion protection box, and after confirming that the clean water covers the bimetallic composite pipe sample, close the explosion protection box cover and then open the manual stop valve;

[0032] Pour clean water into the insulation box. When the clean water level is higher than the height of the bimetallic composite pipe sample, stop pouring water. Heat the clean water into the insulation box to the target temperature through the heater and maintain the target temperature.

[0033] Open the manual stop valve of the injection port and inject the test gas into the bimetallic composite pipe sample through the injection pipe, then close the manual stop valve of the injection port;

[0034] Start the quantitative plunger pump, open the air-controlled stop valve, inject clean water into the bimetallic composite pipe sample, and after increasing the pressure to the target pressure, close the air-controlled stop valve and stop the quantitative plunger pump to keep the bimetallic composite pipe sample at the current target pressure.

[0035] When the pressure test is completed, open the air-controlled pressure relief valve to discharge the test medium in the bimetallic composite pipe sample into the sewage collection tank to complete the water pressure test.

[0036] Preferably, the test medium comprises oilfield water, diesel or crude oil; and the test gas is nitrogen and / or carbon dioxide gas.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a multi-media coupled water pressure testing system and testing method for bimetallic composite pipes, which can meet the requirements of long-term water pressure testing and blasting testing of bimetallic composite pipes under oil-gas mixing, high temperature and high pressure conditions, and can automatically record all temperature and pressure change data during the test. The boosting mechanism can achieve precise boosting and pressure replenishment through the combination of a servo control valve and a single-cylinder servo booster pump, with a fast boosting rate and a uniform and continuous pressure curve. The overall structure of the system equipment is safe and reliable. The structure of the blasting protection box is embedded in the insulation box, and one-way valves are set at multiple locations on the boosting mechanism. This can effectively prevent the bimetallic composite pipe from impacting and corroding the test equipment after blasting, thereby ensuring the safety of on-site staff and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural diagram of the test system of the present invention.

[0039] Figure 2 It is a schematic diagram of the protection mechanism and blasting protection box.

[0040] In the figure: 1. Clean water tank; 2. Dosing plunger pump; 3. Pressure sensor; 4. First one-way valve; 5. Servo pressure regulating valve; 6. Air control cabinet; 7. Manual stop valve at the injection port; 8. Air-controlled stop valve; 9. Air-controlled pressure relief valve; 10. Shock-resistant and corrosion-resistant pressure gauge; 11. Insulation box; 1101. Slide rail; 1102. Insulation box frame; 1103. Support beam; 1104. Electric control cabinet; 1105. Circulation pump; 1106. Circulation pump inlet; 1107. Liquid level sensor; 1108. Temperature sensor; 1109. Heater; 1110. Circulation pump outlet; 12. Explosion protection box; 1201. V-shaped bracket; 1202. Manual stop valve; 13. Bimetallic composite pipe sample; 14. Sewage collection tank; 15. Air compressor; 16. Single-cylinder servo booster pump. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is further described below with reference to specific embodiments and drawings, but the embodiments are not intended to limit the present invention.

[0042] The present invention provides a bimetallic composite pipe multi-media coupling water pressure testing system, see Figures 1-2 As shown, it includes a protection mechanism and a pressurizing mechanism;

[0043] Protection agencies include:

[0044] The heat preservation box 11 has a plurality of support beams 1103 arranged horizontally inside.

[0045] The blasting protection box 12 is arranged in the heat preservation box 11 and is erected on a plurality of support beams 1103. A bracket 1201 for placing the bimetallic composite pipe 13 is provided in the blasting protection box 12;

[0046] The boost mechanism includes:

[0047] The clean water tank 1, the water outlet of the clean water tank 1 is connected to the interior of the explosion protection box 12 through a pipe body that passes through the heat preservation box 11 and the explosion protection box 12 in sequence;

[0048] The quantitative plunger pump 2 is provided on the pipe body between the clean water tank 1 and the insulation box 11;

[0049] The injection pipe is connected to the pipe body between the quantitative plunger pump 2 and the insulation box 11, and a manual stop valve 7 for the injection port is provided on the injection pipe;

[0050] The pipe body between the connection point between the injection pipe and the pipe body and the insulation box 11 is provided with an air-controlled stop valve 8 and an air-controlled pressure relief valve 9 in sequence;

[0051] A first one-way valve 4 is provided between the quantitative plunger pump 2 and the connection between the injection pipe and the pipe body;

[0052] A manual stop valve 1202 is also provided on the pipe body inside the heat preservation box 11 and outside the explosion protection box 12.

[0053] It should be noted that the booster mechanism and protection mechanism are placed on the ground, and the blast protection box is placed on the support beam inside the protection mechanism. The booster mechanism is connected to the protection mechanism via a high-pressure hose, and the blast protection box is connected to the protection mechanism via a high-temperature and high-pressure hose. The bimetallic composite pipe sample is placed on a V-shaped bracket inside the blast protection box and connected to the blast protection box via a high-temperature and high-pressure hose.

[0054] The boosting mechanism mainly provides sufficient and continuous pressure for the bimetallic composite pipe sample, and can realize functions such as pressure boosting, pressure replenishing, pressure relief, and pressure maintenance. The working medium is clean water. There is a welded box-type base at the bottom of the boosting mechanism, and various pumps, valves, and pipe clamp bases are welded on the base. Various pumps and valves are connected to the pump, valve, and pipe clamp bases with bolts. The pumps and valves are connected by high-pressure hard pipes.

[0055] According to the present invention, the boosting mechanism further comprises:

[0056] The pressure sensor 3 is provided on the high-pressure hard pipe between the quantitative plunger pump 2 and the first one-way valve 4; one side of the pressure sensor 3 is connected to the servo pressure regulating valve 5 through the high-pressure hard pipe;

[0057] The air compressor 15 is connected to the air control cabinet 6 , and the air control cabinet 6 is connected to the servo pressure regulating valve 5 , the air control stop valve 8 and the air control pressure relief valve 9 .

[0058] It should be noted that when the pressure in the pipe body is detected by the pressure sensor, if there is a pressure drop, the quantitative plunger pump is started to increase the pressure, and the servo pressure regulating valve 5 is controlled by the air control cabinet to ensure the accuracy of the pressure inside the entire pipeline during the pressurization process.

[0059] The boosting mechanism further includes: a single-cylinder servo booster pump 16, which is arranged in parallel with the quantitative plunger pump 2, with its input end connected to the clean water tank 1 and its output end connected to the pipe body, and its connection point is located between the first one-way valve 4 and the connection point between the injection pipe and the pipe body;

[0060] The shock-resistant and corrosion-resistant pressure gauge 10 is arranged on the pipe body between the air-controlled pressure relief valve 9 and the heat preservation box 11.

[0061] A second one-way valve is provided on the pipe body between the connection point between the single-cylinder servo booster pump 16 and the pipe body and the connection point between the injection pipe and the pipe body.

[0062] In order to facilitate the pipe body to pass through the insulation box and the blasting protection box in sequence, the following are provided:

[0063] The pipe body penetrates the explosion protection box 12 by providing a first pipe joint and a second pipe joint at opposite positions on the inner side and the outer side of one end of the explosion protection box 12, respectively, and the first pipe joint and the second pipe joint penetrate the explosion protection box 12 to communicate with each other.

[0064] The pipe body penetrates the heat preservation box 11 by providing a third pipe joint and a fourth pipe joint at opposite positions on the inner side and the outer side of one end of the heat preservation box 11, and the third pipe joint and the fourth pipe joint penetrate the heat preservation box 11 to communicate with each other.

[0065] It should be noted that as the pipe body sequentially passes through the insulation box and the blast protection box, it first connects to the fourth pipe joint, and then the third and second pipe joints are connected through the pipe body. The first pipe joint is located inside the blast protection box, effectively connecting the pipe body to the interior of the blast protection box. The manual shut-off valve 1202 is located on the pipe body between the third and second pipe joints.

[0066] In this embodiment, the boosting mechanism is mainly composed of a clean water tank 1, a quantitative plunger pump 2, a pressure sensor 3, a one-way valve 4, a servo pressure regulating valve 5, an air control cabinet 6, a manual stop valve 7 for the injection port, an air-controlled stop valve 8, an air-controlled pressure relief valve 9, a shock-resistant and corrosion-resistant pressure gauge 10, a sewage collection tank 14, an air compressor 15, and a single-cylinder servo booster pump 16.

[0067] The outlet of the clean water tank 1 is connected to the quantitative plunger pump 2 and the single-cylinder servo booster pump 16 through a hard pipe. The quantitative plunger pump 2 and the single-cylinder servo booster pump 16 are connected to the injection port manual stop valve 7, the air-controlled stop valve 8, the air-controlled pressure relief valve 9, the shock-resistant and corrosion-resistant pressure gauge 10, and the pressure sensor 3 in sequence through a parallel circuit.

[0068] Between the quantitative plunger pump 2 and the manual stop valve 7 at the injection port, a pressure sensor 3, a servo pressure regulating valve 5, and a first one-way valve 4 are installed. The installation of the first one-way valve can protect the quantitative plunger pump 2 from corrosion. A shock-resistant and corrosion-resistant pressure gauge 10 can be used to observe the quantitative plunger pump pressure.

[0069] The pressure relief path of the pneumatic pressure relief valve 9 is connected to the sewage collection tank 14 via a high-pressure rigid pipe. The air compressor 15 is connected to the pneumatic control cabinet 6 via a hose. The operating air pressure within the pneumatic control cabinet 6 is also connected to the servo pressure regulating valve 5, the pneumatic shutoff valve 8, and the pneumatic pressure relief valve 9 via hoses. The pneumatic control cabinet contains a pneumatic control triplex, a gas cylinder, a proportional valve, a reversing valve, and other components. Its primary function is to control the opening and closing of the pneumatic shutoff valve 8 and the pneumatic pressure relief valve 9, and to provide the required operating air pressure for the servo pressure regulating valve 5.

[0070] A second one-way valve is installed on the left side of the manual stop valve 7 of the injection port to prevent the corrosive medium in the bimetallic composite pipe sample from flowing back to the internal pipeline of the booster mechanism when the pressure is released, thereby corroding the pipeline, pump and valve.

[0071] In this embodiment, it is very difficult to prevent the pressure drop in the bimetallic composite pipe sample only by using the second one-way valve. Therefore, the opening and closing of the air-controlled stop valve is controlled by the air control cabinet and used in conjunction with the second one-way valve to avoid the pressure drop in the bimetallic composite pipe sample.

[0072] It should be noted that the clean water tank 1 serves as a storage tank for the working medium of the booster mechanism, and the quantitative plunger pump 2 is a three-cylinder quantitative plunger pump. The valve core and valve body of the one-way valve, manual shut-off valve 7 for the injection port, pneumatic shut-off valve 8, pneumatic pressure relief valve 9, and single-cylinder servo booster pump 16, which come into contact with the working medium of the booster mechanism, are made of 2205 stainless steel to prevent the corrosive medium in the bimetallic composite pipe sample from accidentally flowing back and corroding the booster mechanism pump and valve components.

[0073] The servo pressure regulating valve 5 is an air-controlled diaphragm pressure control valve. The working air pressure delivered by the air control cabinet is used to control the valve stem of the diaphragm extrusion control valve. The working pressure of the water pressure of the boosting mechanism is controlled by the valve stem according to the principle of force balance. The working pressure of the water pressure of the boosting mechanism is the water pressure at the output end of the quantitative plunger pump.

[0074] The sewage collection tank 14 is a 304 material box, which mainly collects the contaminated corrosive liquid discharged from the air-controlled pressure relief valve after the test is completed. The sewage collection tank 14 is placed in a foundation below the ground to ensure the safety of equipment and personnel.

[0075] The single-cylinder servo booster pump 16 has a very small displacement. The single-cylinder servo booster pump 16 is used to replenish the pressure of the bimetallic composite pipe sample 13 when there is a slight pressure drop inside the bimetallic composite pipe sample 13 during the long-term pressure holding test, generally within 0-1MPa.

[0076] According to the present invention, a cover plate is provided on the top of the heat preservation box 11 , and the cover plate is slidably connected to the top ends of the two side walls of the heat preservation box 11 via slide rails 1101 .

[0077] A liquid level sensor 1107 , a temperature sensor 1108 , a circulation pump 1105 and a heater 1109 are also provided in the heat preservation box 11 .

[0078] In this embodiment, the protection mechanism is mainly composed of an insulation box 11, a slide rail 1101, an insulation box frame 1102, a support beam 1103, an electric control cabinet 1104, a circulation pump 1105, a temperature sensor 1108, a liquid level sensor 1107, and a heater 1109.

[0079] The insulation box frame 1102 is a frame made of overlapped steel sections, with stainless steel plates welded and polished on the outside and 3mm 304 stainless steel plates bent and welded on the inside to prevent leakage and corrosion of the test medium. 120mm composite silicate foam boards are filled between the inner and outer steel plates, and a slide rail is welded on the top of the insulation box frame to match the insulation box cover. The insulation box can be opened by sliding on a flat surface, which is convenient for hoisting the blasting protection box. Four support beams 1103 are welded to the bottom of the insulation box frame 1102 to support the blasting protection box 12 and prevent the blasting protection box 13 from breaking through the insulation box liner due to improper operation during hoisting and causing leakage. An electric control cabinet 1104 is welded to the outside of the right side of the insulation box frame 1102, and a circulating pump 1105, a temperature sensor 1108, a liquid level sensor 1107, and a heater 1109 are welded to the inside of the right side of the insulation box frame 1102. A high-voltage connector is welded on the left side near the upper end, and the working medium of the insulation box is clean water.

[0080] The insulation box cover is a stainless steel square tube frame, the outside is wrapped with a 1.5mm thick 304 stainless steel plate, and the inside is stuffed with insulation cotton.

[0081] The liquid level sensor 1107 uses a 304 probe liquid level sensor, which can monitor the liquid level of the incubator in real time. If the liquid level drops, water will be automatically added to the incubator. The temperature sensor 1108 monitors the temperature change of the incubator in real time to prevent the test temperature from dropping. The circulating pump inlet 1106 is on the right side of the incubator, and the circulating pump outlet 1110 is on the bottom side of the incubator. Figure 2 , ensuring uniform temperature throughout the insulated box. The heater 1109 comprises two sets of 304 stainless steel heating tubes. If one set fails, the other set can continue heating to ensure the completion of the current test. The temperature control of the protection mechanism uses a PID control module.

[0082] It should be noted that the blasting protection box 12 is supported by a channel steel bottom support frame + square tube angle iron. 10mm thick 316 stainless steel plates are welded at both ends of the blasting protection box, and 3mm 316 stainless steel plates are welded at the remaining positions. Four V-shaped brackets 1201 made of square steel are evenly welded inside the stainless steel plate of the blasting protection box to prevent the bimetallic composite pipe sample 13 from shaking circumferentially during the test. A high-pressure connector with a manual shut-off valve 1202 is welded on the left side of the blasting protection box, and there is a frame-type cover on the top, which uses a metal buckle switch. The blasting protection box 12 is mainly used to prevent the bimetallic composite pipe sample from exploding and some of the debris from impacting and damaging the insulation box. At the same time, the medium after the explosion corrodes the electronic components and heat circulation pipelines in the insulation box. In order to ensure that the bimetallic composite pipe sample quickly reaches the target temperature and is heated evenly, the blasting protection box needs to be filled with water to the height above the sample after the sample is installed.

[0083] The present invention provides a method for multi-medium coupled water pressure testing of a bimetallic composite pipe, which uses the above-mentioned multi-medium coupled water pressure testing system for a bimetallic composite pipe, and includes the following steps:

[0084] Inject the test medium into the bimetallic composite pipe sample and place it on the bracket 1201 in the explosion protection box 12; wherein, the end of the bimetallic composite pipe sample is provided with a high-pressure connector with a valve body;

[0085] Close the manual stop valve 1202, connect the high-pressure joint to the end of the pipe connected to the inside of the explosion protection box 12, open the valve on the high-pressure joint, add clean water to the explosion protection box, and after confirming that the clean water covers the bimetallic composite pipe sample, close the explosion protection box cover and then open the manual stop valve 1202;

[0086] Pour clean water into the insulation box 11. When the clean water level is higher than the height of the bimetallic composite pipe sample, stop pouring water. Heat the clean water injected into the insulation box to the target temperature through the heater and maintain the target temperature.

[0087] Open the manual stop valve 7 of the injection port and inject the test gas into the bimetallic composite pipe sample through the injection pipe, then close the manual stop valve 7 of the injection port;

[0088] Start the quantitative plunger pump 2, open the air-controlled stop valve 8, inject clean water into the bimetallic composite pipe sample, and after increasing the pressure to the target pressure, close the air-controlled stop valve 8, and stop the quantitative plunger pump 2 to keep the bimetallic composite pipe sample at the current target pressure.

[0089] When the pressure test is completed, the air-controlled pressure relief valve 9 is opened to discharge the test medium in the bimetallic composite pipe sample into the sewage collection tank, thereby completing the water pressure test.

[0090] In this embodiment, the test medium includes oilfield water, diesel, or crude oil; and the test gas is nitrogen and / or carbon dioxide gas.

[0091] Among them, by starting the quantitative plunger pump to maintain the current target pressure, if the test time is too long and there is a pressure drop of about 1 MPa in the pressure of the bimetallic composite pipe sample, the single-cylinder servo booster pump 16 is started. When the pressure in the pipe body is equal to or slightly greater than the pressure in the bimetallic composite pipe sample, the air-controlled stop valve 8 is opened. When the pressure is increased to the target pressure, the air-controlled stop valve is closed and the single-cylinder servo booster pump is stopped.

[0092] When injecting the test gas, connect the compressed gas cylinder containing the test gas to the injection pipe through a hose, and then open the manual stop valve 7 on the injection port of the injection pipe. The test gas is mainly nitrogen and carbon dioxide. By adjusting the pressure reducing valve on the compressed gas cylinder, inject about 3MPa of test gas into the bimetallic composite pipe sample. After injection, close the manual stop valve 7 on the injection port.

[0093] It should be noted that during the test, the pressure and temperature change curves of the entire process are recorded. When the pressure in the bimetallic composite pipe sample drops to about 0.1MPa, the PLC saves the pressure and temperature change curves of the entire test process and prints them out in the form of a report.

[0094] Finally, take out the bimetallic composite pipe sample; turn off the circulation pump and heater, and after the temperature in the insulation box drops to room temperature, open the insulation box cover, close the manual shut-off valve on the blasting protection box, remove the high-pressure hose between the blasting protection box and the insulation box, hoist the blasting protection box out of the insulation box, open the blasting protection box cover, drain the clean water in the blasting protection box, remove the hose connecting the bimetallic composite pipe sample and the blasting protection box, take out the bimetallic composite pipe sample, and pour the test medium remaining in the bimetallic composite pipe sample into the sewage collection tank.

[0095] Example 1

[0096] A multi-medium coupled water pressure test method for a bimetallic composite pipe includes injecting a test medium into a bimetallic composite pipe sample 13, placing a blasting protection box in an insulation box, heating and maintaining the temperature, injecting a test gas, increasing and maintaining the pressure, completing the pressure test, releasing the pressure, recording the pressure and temperature change curves throughout the process, and removing the bimetallic composite pipe sample. The method specifically includes the following steps:

[0097] Step 1: Inject the test medium into the bimetallic composite pipe sample

[0098] A high-pressure joint with a valve body is welded to the left end of the bimetallic composite pipe sample. The test medium is filled into the bimetallic composite pipe sample through the high-pressure joint. The test medium includes oilfield water, diesel, crude oil, etc. After filling with the test medium, first close the manual stop valve 1202 on the outside of the explosion protection box, and then connect the bimetallic composite pipe sample to the first pipe joint inside the explosion protection box through a high-pressure hose, and place the bimetallic composite pipe sample into the explosion protection box. After the bimetallic composite pipe sample is properly placed and confirmed to have no leakage, add clean water into the explosion protection box. After confirming that the clean water covers the bimetallic composite pipe sample, close the explosion protection box cover.

[0099] Step 2: Place the blasting protection box into the insulation box

[0100] Open the cover of the insulation box through the slide rail, hoist the blasting protection box and place it on the support beam.

[0101] Step 3: Heat and keep warm

[0102] Connect the manual stop valve interface on the outside of the blasting protection box to the high-pressure interface on the inside of the insulation box through a high-pressure hose, and open the manual stop valve 1202 on the outside of the blasting protection box.

[0103] After closing the insulation box cover through the slide rail, inject clean water into the insulation box. When the clean water level is higher than the placement height of the bimetallic composite pipe sample, stop injecting water.

[0104] Heat to the target temperature and maintain the target temperature by the heater.

[0105] Start the circulation pump to ensure that the water temperature in the insulation box is evenly distributed.

[0106] If the test time is too long and the liquid level sensor detects that the water level in the insulation box has dropped, the insulation box will automatically and slowly add water to the insulation box to ensure that the target temperature is maintained.

[0107] Step 4: Inject test gas

[0108] After connecting the compressed gas cylinder containing the test gas to the manual stop valve 7 of the injection port through a hose, open the manual stop valve of the injection port. The test gas is mainly nitrogen and carbon dioxide gas. By adjusting the pressure reducing valve on the compressed gas cylinder, inject about 3MPa of test gas into the bimetallic composite pipe sample. After injection, close the manual stop valve 7 of the injection port.

[0109] Step 5: Boost and maintain pressure

[0110] Start the quantitative plunger pump 2, open the air-controlled stop valve 8, adjust the system pressure through the servo pressure regulating valve 5, and after the pressure is increased to the target pressure, close the air-controlled stop valve 8 and stop the quantitative plunger pump to keep the bimetallic composite pipe sample at the current target pressure.

[0111] If the test time is too long and there is a pressure drop of about 1 MPa in the bimetallic composite pipe sample, the single-cylinder servo booster pump 16 is started. When the pressure in the high-pressure pipeline is equal to or slightly greater than the pressure in the bimetallic composite pipe sample, the air-controlled stop valve 8 is opened. When the pressure is increased to the target pressure, the air-controlled stop valve is closed and the single-cylinder servo booster pump is stopped.

[0112] Step 6: Pressure test is completed and pressure is released

[0113] When the pressure test time is over, the air-controlled pressure relief valve 9 is opened to discharge the test medium in the bimetallic composite pipe sample into the sewage collection tank.

[0114] Step 7: Record the pressure and temperature change curves during the entire process

[0115] When the pressure inside the bimetallic composite pipe sample drops to about 0.1MPa, the PLC saves the pressure and temperature change curves of the entire test process and prints them out in the form of a report.

[0116] Step 8: Take out the bimetallic composite pipe sample

[0117] Turn off the circulation pump and heater, and after the temperature in the insulation box drops to room temperature, open the insulation box cover, close the manual stop valve on the blasting protection box, remove the high-pressure hose between the blasting protection box and the insulation box, hoist the blasting protection box out of the insulation box, open the blasting protection box cover, drain the clean water in the blasting protection box, remove the hose connecting the bimetallic composite pipe sample and the blasting protection box, take out the bimetallic composite pipe sample, and pour the test medium remaining in the bimetallic composite pipe sample into the sewage collection tank.

[0118] Example 2

[0119] A multi-media coupled blasting test method for a bimetallic composite pipe comprises injecting a test medium into a bimetallic composite pipe sample, placing a blasting protection box in an insulation box, heating and maintaining the temperature, injecting a test gas, increasing and maintaining the pressure, blasting the bimetallic composite pipe sample at the increased pressure, completing the pressure test, recording the pressure and temperature change curves throughout the process, and removing the bimetallic composite pipe sample. The method specifically comprises the following steps:

[0120] Step 1: Inject the test medium into the bimetallic composite pipe sample

[0121] A high-pressure joint with a valve body is welded to the left end of the bimetallic composite pipe sample. The test medium is filled into the bimetallic composite pipe sample through the high-pressure joint. The test medium includes oilfield water, diesel, crude oil, etc. After filling with the test medium, first close the manual stop valve 1202 on the outside of the explosion protection box, and then connect the bimetallic composite pipe sample to the first pipe joint inside the explosion protection box through a high-pressure hose, and place the bimetallic composite pipe sample into the explosion protection box. After the bimetallic composite pipe sample is properly placed and confirmed to have no leakage, add clean water into the explosion protection box. After confirming that the clean water covers the bimetallic composite pipe sample, close the explosion protection box cover.

[0122] Step 2: Place the blasting protection box into the insulation box

[0123] Open the cover of the insulation box through the slide rail, hoist the blasting protection box and place it on the support beam.

[0124] Step 3: Heat and keep warm

[0125] Connect the second pipe joint on the outside of the explosion protection box to the third pipe joint on the inside of the insulation box through a high-pressure hose, and open the manual stop valve 1202 on the outside of the explosion protection box.

[0126] After closing the insulation box cover through the slide rail, inject clean water into the insulation box. When the clean water level is higher than the placement height of the bimetallic composite pipe sample, stop injecting water.

[0127] Heat to the target temperature and maintain the target temperature by the heater.

[0128] Start the circulation pump to ensure that the water temperature in the insulation box is evenly distributed.

[0129] If the test time is too long and the liquid level sensor detects that the water level in the insulation box has dropped, the insulation box will automatically and slowly add water to the insulation box to ensure that the target temperature is maintained.

[0130] Step 4: Inject test gas

[0131] After connecting the compressed gas cylinder containing the test gas to the manual stop valve of the injection port through a hose, open the manual stop valve of the injection port. The test gas is mainly nitrogen and carbon dioxide gas. By adjusting the pressure reducing valve on the compressed gas cylinder, inject about 3MPa of test gas into the bimetallic composite pipe sample. After injection, close the manual stop valve of the injection port.

[0132] Step 5: Boost and maintain pressure

[0133] Start the quantitative plunger pump, open the air-controlled stop valve, adjust the system pressure through the servo pressure regulating valve, and after the pressure is increased to the target pressure, close the air-controlled stop valve and stop the quantitative plunger pump to keep the bimetallic composite pipe sample at the current target pressure.

[0134] If the test time is too long and there is a pressure drop of about 1MPa in the bimetallic composite pipe sample, start the single-cylinder servo booster pump. When the pressure in the high-pressure pipeline is equal to or slightly greater than the pressure in the bimetallic composite pipe sample, open the air-controlled stop valve. When the pressure reaches the target pressure, close the air-controlled stop valve and stop the single-cylinder servo booster pump.

[0135] Step 6: Boost pressure and blast the bimetallic composite pipe sample

[0136] Start the quantitative plunger pump, open the air-controlled stop valve, adjust the system pressure through the servo pressure regulating valve, and increase the pressure until the bimetallic composite pipe sample ruptures.

[0137] Step 6: Pressure test completed

[0138] After the bimetallic composite pipe sample breaks, close the air-controlled stop valve and the quantitative plunger pump.

[0139] Step 7: Record the pressure and temperature change curves during the entire process

[0140] When the pressure inside the bimetallic composite pipe sample drops to 0 MPa, the PLC saves the pressure and temperature change curves of the entire test process and prints them out in the form of a report.

[0141] Step 8: Take out the bimetallic composite pipe sample

[0142] Turn off the circulation pump and heater, and after the temperature in the insulation box drops to room temperature, open the insulation box cover, close the manual shut-off valve on the blasting protection box, remove the high-pressure hose between the blasting protection box and the insulation box, hoist the blasting protection box out of the insulation box, open the blasting protection box cover, drain the clean water in the blasting protection box, remove the hose connecting the bimetallic composite pipe sample and the blasting protection box, take out the ruptured bimetallic composite pipe sample, and pour the test medium remaining in the bimetallic composite pipe sample into the sewage collection tank.

[0143] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bimetallic composite pipe multi-media coupling water pressure testing system, characterized in that: Including protection mechanism and boost mechanism; The protection mechanism includes: The heat preservation box (11) has a plurality of support beams (1103) arranged horizontally therein; A blasting protection box (12) is arranged in the heat preservation box (11) and is mounted on the plurality of support beams (1103); a bracket (1201) for placing the bimetallic composite pipe (13) is provided in the blasting protection box (12); The boosting mechanism comprises: A clean water tank (1), wherein the water outlet of the clean water tank (1) is connected to the interior of the explosion protection box (12) via a pipe body that sequentially passes through the heat preservation box (11) and the explosion protection box (12); A quantitative plunger pump (2) is arranged on the pipe body between the clean water tank (1) and the heat preservation box (11); An injection pipe is connected to the pipe body between the quantitative plunger pump (2) and the heat preservation box (11), and a manual stop valve (7) for the injection port is provided on the injection pipe; An air-controlled stop valve (8) and an air-controlled pressure relief valve (9) are sequentially provided on the pipe body between the connection point between the injection pipe and the pipe body and the heat preservation box (11); A first one-way valve (4) is provided between the quantitative plunger pump (2), the connection point between the injection tube and the tube body; A manual stop valve (1202) is also provided on the pipe body inside the heat preservation box (11) and outside the explosion protection box (12).

2. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: The boosting mechanism further comprises: A pressure sensor (3) is provided on the pipe body between the quantitative plunger pump (2) and the first one-way valve (4); a servo pressure regulating valve (5) is also connected to one side of the pressure sensor (3); An air compressor (15) is connected to an air control cabinet (6), and the air control cabinet (6) is connected to a servo pressure regulating valve (5), the air control stop valve (8) and an air control pressure relief valve (9).

3. The multi-media coupled water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: The boosting mechanism further comprises: a single-cylinder servo booster pump (16) arranged in parallel with the quantitative plunger pump (2), with its input end connected to the clean water tank (1) and its output end connected to the pipe body, wherein the connection point is located between the first one-way valve (4) and the connection point between the injection pipe and the pipe body; A shock-resistant and corrosion-resistant pressure gauge (10) is arranged on the pipe body between the air-controlled pressure relief valve (9) and the heat preservation box (11).

4. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 3, characterized in that: A second one-way valve is provided on the pipe body between the connection point between the single-cylinder servo booster pump (16) and the pipe body and the connection point between the injection pipe and the pipe body.

5. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: A cover plate is provided on the top of the heat preservation box (11), and the cover plate is slidably connected to the top ends of the two side walls of the heat preservation box (11) via slide rails (1101).

6. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: The thermal insulation box (11) is further provided with a liquid level sensor (1107), a temperature sensor (1108), a circulation pump (1105) and a heater (1109).

7. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: The pipe body penetrates the explosion protection box (12) by providing a first pipe joint and a second pipe joint at opposite positions on the inner side and the outer side of one end of the explosion protection box (12), respectively, and the first pipe joint and the second pipe joint penetrate the explosion protection box (12) for communication.

8. The multi-media coupling water pressure testing system for bimetallic composite pipes according to claim 1, characterized in that: The pipe body penetrates the heat preservation box (11) by providing a third pipe joint and a fourth pipe joint at relative positions on the inner side and the outer side of one end of the heat preservation box (11), respectively, and the third pipe joint and the fourth pipe joint penetrate the heat preservation box (11) to communicate with each other.

9. A multi-media coupling water pressure testing method for bimetallic composite pipes, characterized in that: The multi-medium coupled water pressure testing system for bimetallic composite pipes according to claim 1 comprises the following steps: A test medium is injected into the bimetallic composite pipe sample, and the sample is placed on a bracket (1201) in the explosion protection box (12); wherein a high-pressure connector with a valve body is provided at the end of the bimetallic composite pipe sample; Close the manual stop valve (1202), connect the high-pressure joint to the end of the pipe connected to the inside of the explosion protection box (12), open the valve on the high-pressure joint, add clean water to the explosion protection box, confirm that the clean water covers the bimetallic composite pipe sample, close the explosion protection box cover, and then open the manual stop valve (1202); Injecting clean water into the insulation box (11), and stopping the water injection when the clean water level is higher than the height at which the bimetallic composite pipe sample is placed; heating the clean water injected into the insulation box to a target temperature through a heater and maintaining the target temperature; After opening the manual stop valve (7) of the injection port and injecting the test gas into the bimetallic composite pipe sample through the injection pipe, the manual stop valve (7) of the injection port is closed; Start the quantitative plunger pump (2), open the air-controlled stop valve (8), inject clean water into the bimetallic composite pipe sample, and after the pressure is increased to the target pressure, close the air-controlled stop valve (8), and stop the quantitative plunger pump (2), so that the bimetallic composite pipe sample maintains the current target pressure; When the pressure test is completed, the air-controlled pressure relief valve (9) is opened to discharge the test medium in the bimetallic composite pipe sample into the sewage collection tank, thus completing the water pressure test.

10. The multi-media coupling water pressure testing method for bimetallic composite pipes according to claim 9, characterized in that: The test medium includes oilfield water, diesel or crude oil; and the test gas is nitrogen and / or carbon dioxide gas.

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