A mechanical composite pipe lining collapse evaluation device and method

Abstract

The present invention discloses a mechanical composite pipe lining collapse evaluation device and method. Through a control unit connected to a temperature sensing element, a pressure sensing element, a heating component, a liquid metering pump and a gas booster pump, program parameters can be set in the control unit according to the operating conditions, and the test pipe temperature, pressure, gas-liquid ratio and other parameters can be controlled automatically, thereby truly simulating the pipe operating conditions; the control unit can be set to allow the flow rate of the flow control valve to simulate the emptying speed, thereby reproducing the pipe emptying process under different gas-liquid ratios; different forms of test pipes can be used to demonstrate the ability of different pipes to resist lining collapse, and at the same time, the lining collapse monitoring component can be used to record the change process of lining deformation over time, thereby realizing the full monitoring and effective evaluation of lining collapse during the emptying process of different pipes. The entire test process is fully automatically and intelligently controlled, easy to operate, easy to implement and reasonable in structure.

Description

Technical Field

[0001] The invention belongs to the field of material composite performance testing and relates to a mechanical composite pipe liner collapse evaluation device and method. Background Art

[0002] In recent years, bimetallic composite pipes are becoming an anti-corrosion pipeline to solve the problem of highly corrosive oil and gas gathering and transportation. At present, corrosion-resistant alloy lined composite pipes have been widely used in highly corrosive oil and gas gathering and transportation pipelines. However, many cases of lining collapse and failure have occurred in the application. The base pipe and lining of the mechanical composite pipe are only tightly fitted together with the help of external loads such as water pressure, and the two are not actually integrated. In actual operation, once the lining is subjected to excessive force, the lining may deform, thereby affecting the operation of the pipeline. Therefore, the lining's ability to resist collapse has become a performance that must be evaluated when using pipes.

[0003] At present, the industry is mainly concerned about the collapse of pipe lining during the external corrosion protection process, and has analyzed the impact of the manufacturing process. By formulating the GB / T 37701 standard, the lining's ability to resist collapse is evaluated by keeping warm for a certain period of time under corrosion temperature conditions. The Chinese patent application number is 201420448517.2, and a corresponding collapse test tooling is proposed. However, for the failure forms that occur during operation (such as lining collapse in some pipe sections after the pipeline is emptied), it is obvious that the existing standards and technologies have not yet involved them, and it is still impossible to evaluate the lining's ability to resist collapse found after the pipeline is emptied. The causes of its failure, influencing factors, and subsequent control measures have not yet been well explored. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that failure forms such as lining collapse after pipeline emptying cannot be evaluated in the prior art, and to provide a mechanical composite pipe lining collapse evaluation device and method, which can accurately simulate the operating temperature, medium, pressure and other working conditions of the pipeline, realize precise control of the emptying speed under different gas-liquid ratio conditions, monitor the pipe lining collapse process online, and comprehensively display the lining composite pipe lining collapse process under different conditions, so as to realize effective evaluation of the lining collapse capacity.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A mechanical composite pipe lining collapse evaluation device, characterized in that it includes a liquid distribution container, a gas distribution container, a gas processing equipment, a heating component, a lining collapse monitoring component, a first test plug and a second test plug for sealing both ends of a test pipe, the first test plug is provided with a first through hole and a second through hole, the first through hole is connected to the liquid distribution container, the second through hole is connected to the gas distribution container, the second test plug is provided with a third through hole, and the third through hole is connected to the gas processing equipment; the heating component and the lining collapse monitoring component are both arranged on the outer wall of the test pipe.

[0007] A further improvement of the present invention is:

[0008] The first through hole is communicated with the liquid preparation container through a liquid injection pipe, and a liquid metering pump and a liquid one-way protection valve are installed on the liquid injection pipe.

[0009] The second through hole is communicated with the gas distribution container through a gas injection pipe, and a gas booster pump and a gas one-way protection valve are installed on the gas injection pipe.

[0010] The third through hole is communicated with the gas processing equipment through a first exhaust pipe, and a flow control valve is installed on the first exhaust pipe.

[0011] A second exhaust pipe communicating with the atmosphere and the gas processing equipment is arranged at the upper end of the gas processing equipment.

[0012] A pressure sensing element and a first temperature sensing element are arranged in the test pipe, and the pressure sensing element and the first temperature sensing element extend to the outside of the first test plug and the second test plug respectively.

[0013] A second temperature sensing element and a heat-insulating layer are installed on the outer wall of the test pipe.

[0014] It also includes a control unit, the control end of which is connected to the lining collapse monitoring component, the liquid metering pump, the gas booster pump, the flow control valve, the pressure sensing element, the first temperature sensing element and the second temperature sensing element.

[0015] Lining collapse monitoring components are installed on the outer wall of the test pipe at intervals of 120° along the circumferential direction.

[0016] An evaluation method using a mechanical composite pipe liner collapse evaluation device comprises the following steps:

[0017] Step 1: Set the target test solution volume, tube wall temperature, tube temperature, tube pressure, pressure holding time, and emptying flow rate, and set the priority order, and complete the test solution pumping, test temperature operation, test gas pumping, pressure holding operation, and emptying operation in sequence to complete the test preparation;

[0018] Step 2: According to the working condition requirements, the test solution in the liquid distribution container is pumped into the test pipe through the liquid injection pipe until the test solution volume reaches the target test solution volume, and the heating component is turned on until the pipe wall temperature rises to the set pipe wall temperature. The constant temperature heating is maintained until the temperature inside the pipe reaches the set pipe temperature. The test gas in the gas distribution container is pumped into the test pipe through the gas injection pipe until the pressure inside the pipe reaches the set pipe pressure, and the medium simulation stage of the test working condition is completed;

[0019] Step 3, start the test timing until the set pressure holding time is reached, and the pressure holding stage is completed; when the temperature inside the test tube drops during the pressure holding period, start the heating component to reheat until the temperature inside the test tube reaches the set tube temperature, and then stop heating, and repeat the operation;

[0020] Step 4, emptying according to the set emptying flow rate, controlling the emptying rate of the flow control valve through the control unit, discharging the gas in the test pipe through the first emptying pipe to the gas treatment device, and discharging the treated gas into the atmosphere through the second emptying pipe, and recording the change process of lining deformation over time through the lining collapse monitoring component, the emptying is completed, and the test is completed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses a mechanical composite pipe lining collapse evaluation device, wherein a liquid distribution container, a gas distribution container and a gas recovery device are respectively installed at both ends of the test pipe, and a heating component and a lining collapse monitoring component are installed on the outer wall of the test pipe. The ability of different pipes to resist lining collapse can be demonstrated by means of test pipes of different forms, and the lining collapse monitoring component is used to record the change process of lining deformation over time, thereby realizing full-process monitoring and effective evaluation of lining collapse during the emptying process of different pipes.

[0023] The present invention discloses an evaluation method for a mechanical composite pipe lining collapse evaluation device, wherein a test solution and a test gas according to working condition requirements are pumped into the test pipe to reach a set volume and pressure, the heating component is turned on, the test pipe is cyclically heated, and then emptied. The lining collapse monitoring component records the change process of the echo between interfaces over time, and the echo change curve between interfaces is used to show the deformation amplitude of the lining, thereby characterizing the lining collapse; the flow control valve is set by the control unit to allow the flow rate to simulate the emptying speed, thereby reproducing the pipe emptying process under different gas-liquid ratios; the entire test process is fully automatically and intelligently controlled, easy to operate, easy to implement and with a reasonable structure.

[0024] Furthermore, the test pipe material, i.e., the mechanical composite pipe section under different conditions to be evaluated in the test, may be a pipe in an intact state, or a pipe section with a defective lining, or a pipe with a perforated lining, etc.

[0025] Furthermore, the liquid one-way protection valve and the gas one-way protection valve are respectively arranged on the liquid injection pipe and the gas injection pipe, which can prevent the liquid and gas in the test pipe from flowing back.

[0026] Furthermore, the flow control valve is a pneumatic control valve with a control accuracy of 0.01m 3 / min.

[0027] Furthermore, the pressure sensing element passes through the test plug and extends into the test sample to measure the internal pressure of the pipeline; the first temperature sensing element and the second temperature sensing element are respectively attached to the outer wall of the test pipe and pass through the test plug to extend into the test pipe, and are used to measure the temperature inside the pipe and the temperature of the medium on the pipe wall and thus control the temperature of the medium in the pipe.

[0028] Furthermore, the liquid injection pipe, gas injection pipe and exhaust pipe have pressure bearing and corrosion resistance capabilities, and corrosion-resistant alloy materials should be selected.

[0029] Furthermore, the control unit can control the gas metering pump air intake according to the pressure feedback from the sensor element, control the liquid metering pump liquid intake according to the set value, control the emptying rate of the flow control valve according to the set value, and record the interface echo change curve over time according to the monitoring precision component. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the mechanical composite pipe liner collapse evaluation device of the present invention.

[0031] Among them: 1-test pipe; 2-liquid distribution container; 3-gas distribution container; 4-gas processing device; 5-lining collapse monitoring component; 6-control unit; 7-first test plug; 8-liquid injection pipe; 9-gas injection pipe; 10-liquid metering pump; 11-liquid one-way protection valve; 12-gas booster pump; 13-gas one-way protection valve; 14-first drain pipe; 15-flow control valve; 16-pressure sensor element; 17-first temperature sensor element; 18-heating component; 19-insulation layer; 20-second test plug; 21-second temperature sensor element; 22-second drain pipe. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0034] See also Figure 1The present invention provides a mechanical composite pipe lining collapse evaluation device, comprising a liquid distribution container 2, a gas distribution container 3, a gas processing device 4, a first test plug 7 and a second test plug 20 for plugging both ends of a test pipe 1, wherein the test pipe 1 is a section of a mechanical composite pipe in different states to be evaluated in the test, which can be a pipe in a good state, or a section with a defective lining, or a pipe with a perforated lining, etc. The first test plug 7 is provided with a first through hole and a second through hole, and the second test plug 20 is provided with a third through hole. The first through hole is connected to the liquid distribution container 2 through a liquid injection pipe 8, and a liquid metering pump 10 and a liquid one-way protection valve 11 are installed on the liquid injection pipe 8. The second through hole is connected to the gas distribution container 3 through a gas injection pipe 9, and a gas booster pump 12 and a gas one-way protection valve 13 are installed on the gas injection pipe 9. The liquid one-way protection valve 11 and the gas one-way protection valve 13 can prevent the backflow of liquid and gas in the test pipe. The third through hole is connected to the gas processing device 4 through the first exhaust pipe 14. A flow control valve 15 is installed on the first exhaust pipe 14. The flow control valve is a pneumatic control valve with a control accuracy of 0.01m 3 The upper end of the gas processing device 4 is provided with a second exhaust pipe 22 communicating with the atmosphere and the interior of the gas processing device 4 .

[0035] The evaluation device of the present invention also includes a heating component 18 and a lining collapse monitoring component 5, both of which are arranged on the outer wall of the test pipe 1. The lining collapse monitoring components 5 are installed on the outer wall of the test pipe 1 at intervals of 120° along the circumferential direction. A pressure sensing element 16 and a first temperature sensing element 17 are arranged in the test pipe 1. The pressure sensing element 16 penetrates through the test plug and penetrates into the test sample to measure the internal pressure of the pipeline. A second temperature sensing element 21 and an insulation layer 19 are installed on the outer wall of the test pipe 1. The first temperature sensing element 17 and the second temperature sensing element 21 are respectively attached to the outer wall of the test pipe and penetrate through the test plug to extend into the test pipe, and are used to measure the temperature inside the pipe and the temperature of the medium in the pipe wall, thereby controlling the temperature of the medium in the pipe.

[0036] It also includes a control unit 6, the control end of which is connected to the lining collapse monitoring component 5, the liquid metering pump 10, the gas booster pump 12, the flow control valve 15, the pressure sensing element 16, the first temperature sensing element 17 and the second temperature sensing element 21. The control unit can control the gas intake of the gas metering pump according to the pressure feedback from the sensing element, control the liquid intake of the liquid metering pump according to the set value, control the emptying rate of the flow control valve according to the set value, and record the curve of the echo change between interfaces over time according to the monitoring component.

[0037] The present invention provides an evaluation method for a mechanical composite pipe liner collapse evaluation device, comprising the following steps:

[0038] Step 1, set the target test solution volume, tube wall temperature, tube temperature, tube pressure, pressure holding time, and emptying flow rate in the control unit 6, and set the priority order, and complete the test solution pumping, test temperature operation, test gas pumping, pressure holding operation, and emptying operation in sequence to complete the test preparation;

[0039] Step 2: According to the working condition requirements, the test solution in the liquid preparation container 2 is pumped into the test pipe 1 through the liquid injection pipe 8 until the solution volume reaches the set test solution volume, the heating component 18 is turned on until the pipe wall temperature rises to the set pipe wall temperature, and the constant temperature heating is maintained until the temperature inside the pipe reaches the set pipe temperature, and the test gas in the gas preparation container 3 is pumped into the test pipe 1 through the gas injection pipe 9 until the pressure inside the pipe reaches the set pipe pressure, and the medium simulation stage of the test working condition is completed;

[0040] Step 3, start the test timing until the set pressure holding time is reached, and the pressure holding stage is completed; when the temperature in the test tube 1 drops during the pressure holding period, the heating component 18 is started to heat again until the temperature in the test tube 1 reaches the set tube temperature, and then the heating is stopped, and the operation is repeated;

[0041] Step 4, emptying is performed according to the set emptying flow rate, the emptying rate of the flow control valve 15 is controlled by the control unit 6, the gas in the test pipe 1 is discharged to the gas treatment device 4 through the first emptying pipe 14, the treated gas is discharged into the atmosphere through the second emptying pipe 22, and the change process of the lining deformation over time is recorded through the lining collapse monitoring component 5, the emptying is completed, and the test is completed.

[0042] The mechanical composite pipe lining collapse evaluation device and method disclosed in the present invention sets program parameters in the control unit according to the operating conditions, automatically controls the test pipe temperature, pressure, gas-liquid ratio and other parameters, and thus truly simulates the pipe operating conditions; can use different forms of test pipes to demonstrate the ability of different pipes to resist lining collapse, and use lining collapse monitoring components to record the change process of lining deformation over time, thereby achieving full monitoring and effective evaluation of lining collapse during the emptying process of different pipes. The entire test process is fully automatically and intelligently controlled, easy to operate, easy to implement and has a reasonable structure.

[0043] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A mechanical composite pipe liner collapse evaluation device, characterized in that: The invention comprises a liquid preparation container (2), a gas preparation container (3), a gas processing device (4), a heating component (18), a lining collapse monitoring component (5), a first test plug (7) and a second test plug (20) for plugging both ends of a test pipe (1), the first test plug (7) being provided with a first through hole and a second through hole, the first through hole being connected to the liquid preparation container (2), the second through hole being connected to the gas preparation container (3), the second test plug (20) being provided with a third through hole, the third through hole being connected to the gas processing device (4); the heating component (18) and the lining collapse monitoring component (5) are both arranged on the outer wall of the test pipe (1); The first through hole is connected to the liquid preparation container (2) via a liquid injection pipe (8), and a liquid metering pump (10) and a liquid one-way protection valve (11) are installed on the liquid injection pipe (8); The second through hole is connected to the gas distribution container (3) via a gas injection pipe (9), and a gas booster pump (12) and a gas one-way protection valve (13) are installed on the gas injection pipe (9); The third through hole is connected to the gas processing equipment (4) via a first exhaust pipe (14), and a flow control valve (15) is installed on the first exhaust pipe (14); A second exhaust pipe (22) is provided at the upper end of the gas processing device (4) and is connected to the atmosphere and the gas processing device (4); A pressure sensing element (16) and a first temperature sensing element (17) are arranged in the test pipe (1), and the pressure sensing element (16) and the first temperature sensing element (17) extend to the outside of the first test plug (7) and the second test plug (20) respectively; A second temperature sensing element (21) and a thermal insulation layer (19) are installed on the outer wall of the test pipe (1); It also includes a control unit (6), wherein a control end of the control unit (6) is connected to a lining collapse monitoring assembly (5), a liquid metering pump (10), a gas booster pump (12), a flow control valve (15), a pressure sensing element (16), a first temperature sensing element (17), and a second temperature sensing element (21).

2. A mechanical composite pipe liner collapse assessment device according to claim 1, characterized in that: Liner collapse monitoring components (5) are installed on the outer wall of the test pipe (1) at intervals of 120° along the circumferential direction.

3. An evaluation method using the mechanical composite pipe liner collapse evaluation device according to claim 1, characterized in that: The steps include: Step 1: Set the target test solution volume, tube wall temperature, tube temperature, tube pressure, pressure holding time, and emptying flow rate, and set the priority order, and complete the test solution pumping, test temperature operation, test gas pumping, pressure holding operation, and emptying operation in sequence to complete the test preparation; Step 2, according to the working condition requirements, the test solution in the liquid distribution container (2) is pumped into the test pipe (1) through the liquid injection pipe (8) until the volume of the test solution reaches the target test solution volume, the heating component (18) is turned on until the pipe wall temperature rises to the set pipe wall temperature, and the constant temperature heating is maintained until the temperature inside the pipe reaches the set pipe temperature, and the test gas in the gas distribution container (3) is pumped into the test pipe (1) through the gas injection pipe (9) until the pressure inside the pipe reaches the set pipe pressure, thereby completing the medium simulation stage of the test working condition; Step 3, starting the test timing until the set pressure holding time is reached, and the pressure holding stage is completed; when the temperature inside the test tube (1) drops during the pressure holding period, the heating component (18) is started to reheat until the temperature inside the test tube (1) reaches the set tube temperature, and then the heating is stopped, and the operation is repeated in this way; Step 4, emptying is performed according to the set emptying flow rate, the emptying rate of the flow control valve (15) is controlled by the control unit (6), the gas in the test pipe (1) is discharged to the gas treatment device (4) through the first emptying pipe (14), the treated gas is discharged into the atmosphere through the second emptying pipe (22), and the change process of the lining deformation over time is recorded by the lining collapse monitoring component (5), the emptying is completed, and the test is completed.

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