Pipeline automatic sampling and density conductivity detection method

Abstract

The invention relates to the technical field of petroleum detection, in particular to a pipeline automatic sampling and density conductivity detection method. The method comprises the following steps: 1, observing an oil pipeline, 2, combining and connecting, 3, controlling sampling operation, and 4, detecting density conductivity. The steps of sampling, inspection and detection and photographing and uploading are achieved through remote control, the aviation kerosene automatic quantitative sampling function is achieved, meanwhile, sample density, conductivity and appearance detection can be completed in the sampling period, sample indexes can be monitored in real time, oil quality property changes can be observed in time, and the detection accuracy is improved. Manual work is replaced to achieve automatic sampling of the pipeline, density measurement, conductivity measurement, appearance photographing and uploading and sample reserving are carried out, sealed protection is formed, the automatic detection effect is met, and therefore flammable and explosive conditions are completely eradicated.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum detection, in particular to a pipeline automatic sampling and density conductivity detection method. Background Art

[0002] In the measurement and quality control of long-distance oil pipelines, in order to determine the quality parameters of oil products, it is necessary to dynamically sample the oil products in the pipeline and send them to the laboratory for testing and analysis. The key to pipeline dynamic sampling is the representativeness of the oil samples taken, which must truly reflect the overall situation of the oil products passing through the pipeline during that period.

[0003] The current online sampling model is an online sampling system that directly extracts representative samples from the pipeline. The samples are collected into an atmospheric pressure receiver under the working pressure of the pipeline through manual extraction or external force. This step-by-step sampling method obtains samples that are not synchronized with the real-time working conditions of the pipeline, and requires manual participation in sampling operations at multiple nodes, which is prone to pollution, increases labor workload, and causes flammable and explosive situations, affecting the overall sampling effect.

[0004] Therefore, in view of the problem that samples are collected into an atmospheric pressure receiver under pipeline working pressure by manual extraction or external force, this step-by-step sampling method is not synchronized with the real-time working conditions of the pipeline, and requires manual participation in sampling operations at multiple nodes, which is easy to cause pollution, increase the workload, and cause flammable and explosive situations. A pipeline automatic sampling and density conductivity detection method can be designed. Summary of the invention

[0005] In order to overcome the problem of collecting samples into an atmospheric pressure receiver under pipeline working pressure through manual extraction or external force, this step-by-step sampling method obtains samples that are not synchronized with the real-time working conditions of the pipeline, and requires manual participation in sampling operations at multiple nodes, which is easy to cause pollution, increase the workload, and cause flammable and explosive situations, affecting the overall sampling effect.

[0006] The technical solution of the present invention is: a pipeline automatic sampling and density conductivity detection method, comprising the following steps;

[0007] Step 1: Observe the oil pipeline

[0008] Observe the overall status of the oil pipeline, perform treatment operations around the pipeline, and maintain the cleanliness of the sampling environment and instruments and equipment;

[0009] Step 2: Combine and connect

[0010] The sampling port and oil return port should avoid elbows, branch pipes and valves, etc. The opening position is usually at the lower half of the pipeline near the bottom. The sampling port and oil return port are set at two points on the oil pipeline. The U-shaped pipeline is set, and the oil transmission components are assembled on the pipeline in sequence;

[0011] Step 3: Control sampling operation

[0012] The oil passes through the U-shaped pipeline and is transported by the control pump in turn. The first electromagnetic valve, the third electromagnetic valve, and the second electromagnetic valve are opened, and the control pump is started. The oil in the pipeline is discharged through the oil return port by calculating the volume of the pipeline and replaced with new oil. After the oil is replaced, the third electromagnetic valve is closed and the flow control electromagnetic valve is opened for sampling. The quantitative sample is injected into the sampling bottle through the liquid separation control device. When the sampling bottle is full, the sampling slot is rotated to replace the next sampling bottle and wait for the next sampling.

[0013] Step 4: Density and conductivity testing

[0014] During the transportation process, the electronic density meter transmits density data, the online conductivity meter transmits conductivity data, and the high-definition camera takes pictures of the samples and uploads them.

[0015] Preferably, according to step one, remove obvious dirt on the pipeline surface, check and remove easily clogged components, follow the process flow, first the main line and then the branch line, blow from high to low to prevent dirt from entering the equipment, use a high-pressure water jet between 50 MPa and 80 MPa to clean the equipment, and stay at a distance of 1 m for 5 min to 8 min.

[0016] Preferably, according to step one, the sampling point is selected on the pressure pipeline and is led out from the low-temperature part of the main pipeline of the flowing process material. The inner diameters of the sampling hole and the oil return hole are 80mm to 120mm. Solenoid valve 1 and solenoid valve 2 are respectively installed inside the sampling port and the oil return port, and a U-shaped pipeline is connected between solenoid valve 1 and solenoid valve 2.

[0017] Preferably, according to step 2, an electronic density meter, an online conductivity meter, a control pump, a third electromagnetic valve, a flow control electromagnetic valve, an online flow meter and a liquid separation control device are sequentially installed on the three-way U-shaped pipeline.

[0018] Preferably, according to step 4, the online conductivity meter is turned to the "calibration" position for 1 to 2 minutes and adjusted to the full scale indication.

[0019] Preferably, a suitable range, low frequency and high frequency are selected according to the conductivity, and the liquid sample to be tested is placed between the electrodes. When the conductivity of the solution changes, an electromotive force difference is generated between the reference electrode and the working electrode, and this signal is converted and displayed.

[0020] Preferably, the liquid dispensing control device includes a fully automatic liquid dispenser, which starts the device to perform automatic liquid dispensing, with a liquid volume of 1L to 4L, a dispensing number of 1 to 3 times, and a dispensing speed of 1L / 1min to 1.5min.

[0021] Preferably, the online flow meter calculates that the oil has passed through 1L to 5L, and transmits the information to the flow control solenoid valve to close it.

[0022] Beneficial effects of the present invention:

[0023] 1. According to the previous manual extraction or external force, the samples were collected into the atmospheric pressure receiver under the working pressure of the pipeline. This step-by-step sampling method is not synchronized with the real-time working conditions of the pipeline, and requires manual participation in sampling operations at multiple nodes, which increases the workload and affects the overall sampling effect. The difference is that the sampling, inspection and testing, photo uploading steps are realized through remote control, and the automatic quantitative sampling function of aviation kerosene can be realized. At the same time, the sample density, conductivity and appearance detection can be completed during the sampling period, the sample indicators can be monitored in real time, and the changes in the quality properties of the oil products can be observed in time. It replaces manual work to realize automatic pipeline sampling and density measurement, conductivity measurement, appearance photo uploading and sample retention, forming an automated operation to prevent oil spillage, form a sealed protection, meet the automatic detection effect, and thus prevent flammable and explosive situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall process of the present invention; DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] See also Figure 1 , the present invention provides an embodiment: a pipeline automatic sampling and density conductivity detection method, comprising the following steps;

[0027] Step 1: Observe the oil pipeline

[0028] Observe the overall status of the oil pipeline, perform treatment operations around the pipeline, and maintain the cleanliness of the sampling environment and instruments and equipment;

[0029] Step 2: Combine and connect

[0030] The sampling port and oil return port should avoid elbows, branch pipes and valves, etc. The opening position is usually at the lower half of the pipeline near the bottom. The sampling port and oil return port are set at two points on the oil pipeline. The U-shaped pipeline is set, and the oil transmission components are assembled on the pipeline in sequence;

[0031] Step 3: Control sampling operation

[0032] The oil passes through the U-shaped pipeline and is transported by the control pump in turn. The first electromagnetic valve, the third electromagnetic valve, and the second electromagnetic valve are opened, and the control pump is started. The oil in the pipeline is discharged through the oil return port by calculating the volume of the pipeline and replaced with new oil. After the oil is replaced, the third electromagnetic valve is closed and the flow control electromagnetic valve is opened for sampling. The quantitative sample is injected into the sampling bottle through the liquid separation control device. When the sampling bottle is full, the sampling slot is rotated to replace the next sampling bottle and wait for the next sampling.

[0033] Step 4: Density and conductivity testing

[0034] During the transportation process, the electronic density meter transmits density data, the online conductivity meter transmits conductivity data, and the high-definition camera takes pictures of the samples and uploads them.

[0035] Example 1

[0036] The present invention provides an embodiment: a pipeline automatic sampling and density conductivity detection method, comprising the following steps;

[0037] Step 1: Observe the oil pipeline

[0038] Observe the overall status of the oil pipeline, perform treatment operations around the pipeline, maintain the cleanliness of the sampling environment and instruments and equipment, remove obvious dirt on the pipeline surface according to step one, check and remove easy blockages, follow the process direction, first the main line and then the branch line, blow from high to low to prevent dirt from entering the equipment, use 50 MPa high-pressure water jet cleaning operation, stay at a distance of 1m for 5min, select the sampling point on the pressure pipeline according to step one, lead out from the low-temperature part of the main pipeline of the flowing process material, the inner diameter of the sampling hole and the return oil hole is 80mm, and the electromagnetic valve 1 and the electromagnetic valve 2 are installed inside the sampling port and the return oil port respectively, and the electromagnetic valve 1 and the electromagnetic valve 2 are connected with a U-shaped pipeline;

[0039] Step 2: Combine and connect

[0040] The sampling port and oil return port should avoid elbows, branch pipes and valves, etc. The opening position is usually at the lower half of the pipeline near the bottom. The sampling port and oil return port are set at two points on the oil pipeline. The U-shaped pipeline is set, and the oil transmission components are assembled on the pipeline in sequence;

[0041] Step 3: Control sampling operation

[0042] The oil passes through the U-shaped pipeline and is transported by the control pump in turn. The first electromagnetic valve, the third electromagnetic valve, and the second electromagnetic valve are opened, and the control pump is started. The oil in the pipeline is discharged through the oil return port by calculating the pipeline volume and replaced with new oil. After the oil is replaced, the third electromagnetic valve is closed, and the flow control electromagnetic valve is opened for sampling. The quantitative sample is injected into the sampling bottle through the liquid separation control device. When the sampling bottle is full, the sampling tank is rotated to replace the next sampling bottle and wait for the next sampling. According to steps two and three, the electronic density meter, the online conductivity meter, the control pump, the electromagnetic valve three, the flow control electromagnetic valve, the online flow meter and the liquid separation control device are installed on the U-shaped pipeline in turn;

[0043] Step 4: Density and conductivity testing

[0044] During the transportation process, the electronic density meter transmits density data while sampling, the online conductivity meter transmits conductivity data, and the high-definition camera takes pictures of the samples and uploads them. According to step 4, the online conductivity meter turns the calibration and measurement switch to the "calibration" position, preheats for 1 minute and adjusts to the full scale indication. According to the conductivity, the appropriate range low-frequency state is selected, and the liquid sample to be tested is placed between the electrodes. When the conductivity of the solution changes, an electromotive force difference is generated between the reference electrode and the working electrode. This signal is converted and displayed. The liquid dispensing control device includes a fully automatic liquid dispenser, which starts the equipment and performs automatic liquid dispensing. The liquid volume is 1L, the number of dispensing times is 1 time, and the dispensing speed is 1L / 1min. The online flow calculation oil passes through 1L and transmits information to the flow control solenoid valve for closing.

[0045] Example 2

[0046] The present invention provides an embodiment: a pipeline automatic sampling and density conductivity detection method, comprising the following steps;

[0047] Step 1: Observe the oil pipeline

[0048] Observe the overall status of the oil pipeline, perform treatment operations around the pipeline, maintain the cleanliness of the sampling environment and instruments and equipment, remove obvious dirt on the pipeline surface according to step one, check and remove easily blocked components, follow the process direction, first the main line and then the branch line, blow from high to low to prevent dirt from entering the equipment, use a high-pressure water jet between 80 MPa to clean the operation, stay at a distance of 1m for 8min, select the sampling point on the pressure pipeline according to step one, lead it out from the low-temperature part of the main pipeline of the flowing process material, the inner diameter of the sampling hole and the oil return hole is 120mm, and the electromagnetic valve 1 and the electromagnetic valve 2 are installed inside the sampling port and the oil return port respectively, and the electromagnetic valve 1 and the electromagnetic valve 2 are connected to the U-shaped pipeline;

[0049] Step 2: Combine and connect

[0050] The sampling port and oil return port should avoid elbows, branch pipes and valves, etc. The opening position is usually at the lower half of the pipeline near the bottom. The sampling port and oil return port are set at two points on the oil pipeline. The U-shaped pipeline is set, and the oil transmission components are assembled on the pipeline in sequence;

[0051] Step 3: Control sampling operation

[0052] The oil passes through the U-shaped pipeline and is transported by the control pump in turn. The first electromagnetic valve, the third electromagnetic valve, and the second electromagnetic valve are opened, and the control pump is started. The oil in the pipeline is discharged through the oil return port by calculating the pipeline volume and replaced with new oil. After the oil is replaced, the third electromagnetic valve is closed, and the flow control electromagnetic valve is opened for sampling. The quantitative sample is injected into the sampling bottle through the liquid separation control device. When the sampling bottle is full, the sampling tank is rotated to replace the next sampling bottle and wait for the next sampling. According to steps two and three, the electronic density meter, the online conductivity meter, the control pump, the electromagnetic valve three, the flow control electromagnetic valve, the online flow meter and the liquid separation control device are installed on the U-shaped pipeline in turn;

[0053] Step 4: Density and conductivity testing

[0054] During the transportation process, the electronic density meter transmits density data while sampling, the online conductivity meter transmits conductivity data, and the high-definition camera takes pictures of the samples and uploads them. According to step 4, the online conductivity meter turns the calibration and measurement switch to the "calibration" position, preheats for 2 minutes and adjusts to the full scale indication. According to the conductivity, the appropriate range, low frequency and high frequency are selected, and the liquid sample to be tested is placed between the electrodes. When the conductivity of the solution changes, an electromotive force difference is generated between the reference electrode and the working electrode. This signal is converted and displayed. The liquid dispensing control device includes a fully automatic liquid dispenser, which starts the equipment and performs automatic liquid dispensing. The liquid volume is 4L, the number of dispensing times is 3, and the dispensing speed is 1L / 1.5min. The online flow calculation oil passes 5L and transmits information to the flow control solenoid valve for closing.

[0055] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. The pipeline automatic sampling and density conductivity detection method is characterized by: The steps include: Step 1: Observe the oil pipeline Observe the overall status of the oil pipeline, perform treatment operations around the pipeline, and maintain the cleanliness of the sampling environment and instruments and equipment; Step 2: Combine and connect The sampling port and oil return port should avoid elbows, branch pipes and valves, etc. The opening position is usually at the lower half of the pipeline near the bottom. The sampling port and oil return port are set at two points on the oil pipeline. The U-shaped pipeline is set, and the oil transmission components are assembled on the pipeline in sequence; Step 3: Control sampling operation The oil passes through the U-shaped pipeline and is transported by the control pump in turn. The first electromagnetic valve, the third electromagnetic valve, and the second electromagnetic valve are opened, and the control pump is started. The oil in the pipeline is discharged through the oil return port by calculating the volume of the pipeline and replaced with new oil. After the oil is replaced, the third electromagnetic valve is closed and the flow control electromagnetic valve is opened for sampling. The quantitative sample is injected into the sampling bottle through the liquid separation control device. When the sampling bottle is full, the sampling slot is rotated to replace the next sampling bottle and wait for the next sampling. Step 4: Density and conductivity testing During the transportation process, the electronic density meter transmits density data, the online conductivity meter transmits conductivity data, and the high-definition camera takes pictures of the samples and uploads them.

2. The pipeline automatic sampling and density conductivity detection method according to claim 1 is characterized in that: According to step 1, remove obvious dirt on the surface of the pipeline, check and remove components that are prone to clogging, and follow the process flow, first the main line and then the branch line, blowing from high to low to prevent dirt from entering the equipment. Use a high-pressure water jet between 50 MPa and 80 MPa to clean the equipment, and stay at a distance of 1m for 5min to 8min.

3. The pipeline automatic sampling and density conductivity detection method according to claim 1 is characterized in that: According to step one, the sampling point is selected on the pressure pipeline and is led out from the low-temperature part of the main pipeline of the flowing process material. The inner diameters of the sampling hole and the oil return hole are 80mm to 120mm. Solenoid valve 1 and solenoid valve 2 are installed inside the sampling port and the oil return port respectively. A U-shaped pipeline is connected between solenoid valve 1 and solenoid valve 2.

4. The pipeline automatic sampling and density conductivity detection method according to claim 1 is characterized in that: According to step 2, install the electronic density meter, online conductivity meter, control pump, electromagnetic valve 3, flow control electromagnetic valve, online flow meter and liquid separation control device on the three-way U-shaped pipeline in sequence.

5. The pipeline automatic sampling and density conductivity detection method according to claim 4 is characterized in that: According to step 4, for the online conductivity meter, turn the calibration and measurement switch to the "calibration" position, and adjust to the full scale indication for 1min to 2min.

6. The pipeline automatic sampling and density conductivity detection method according to claim 4 is characterized in that: Select the appropriate range, low frequency and high frequency according to the conductivity, place the liquid sample to be tested between the electrodes, when the conductivity of the solution changes, an electromotive force difference is generated between the reference electrode and the working electrode, and this signal is converted and displayed.

7. The pipeline automatic sampling and density conductivity detection method according to claim 4 is characterized in that: The liquid dispensing control device includes a fully automatic liquid dispenser, a start-up device, and automatic liquid dispensing, with a liquid volume of 1L to 4L, a dispensing number of 1 to 3 times, and a dispensing speed of 1L / 1min to 1.5min.

8. The pipeline automatic sampling and density conductivity detection method according to claim 1 is characterized in that: The online flow meter calculates the oil flow through 1L to 5L and transmits the information to the flow control solenoid valve to close.

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