Intelligent sampling device and method for oil field

Abstract

The invention relates to the technical field of oil field oil production engineering, and discloses an intelligent sampling device and method for an oil field. The intelligent sampling device for the oil field comprises a signal acquisition module, an electric control module, a data storage unit, a data transmission unit, a data processing unit, a mixed liquid main pipe, a mixed liquid inlet, a sampling port and a mixed liquid outlet, the signal acquisition module, the electric control module, the data storage unit and the data transmission unit are respectively and electrically connected with the data processing unit, and the data processing unit is configured to control the signal acquisition module, the electric control module, the data storage unit and the data transmission unit so as to realize data acquisition, storage and transmission. All mixed liquid in a pipeline can be collected, the sampled oil-water mixed liquid is more uniform and representative, the water content of crude oil can be truly reflected, accurate measurement of the oil well yield is guaranteed, the collected data can be transmitted to a central control room in a wireless mode, and the digital and automatic management level of an oil field at present is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield production engineering, and in particular to an intelligent oilfield sampling device and method. Background Art

[0002] In the production of oil wells in oil fields, water content is an important indicator for measuring the output fluid. The water content directly affects the production, gathering, dehydration, metering, sales, refining and other links of crude oil. The higher the water content, the higher the cost of crude oil production, the more crude oil processing procedures, the more complex the processing process, the greater the processing difficulty, the higher the processing cost, and the more supporting facilities and equipment that need to be built on the oil field site. Accurate detection of crude oil water content can estimate crude oil production and predict the development life of oil wells. It is an important basis for evaluating oil field development investment and long-term comprehensive benefits. In the current state, the sampling device for crude oil water content only installs a valve in the vertical direction of the wellhead riser, and the wellhead mixed liquid is sampled through the valve to test the water content of crude oil. The disadvantages of this method are: due to the different physical properties (viscosity, temperature) of crude oil in each well, the crude oil and water are mixed unevenly. When sampling through the valve, only part of the mixed liquid in the pipeline can be sampled, and all the mixed liquid in the pipeline cannot be sampled, resulting in poor representativeness of the collected mixed liquid and cannot accurately reflect the actual crude oil water content of the oil well.

[0003] Based on patent search, the existing oil well sampling technologies are exemplified as follows: Example 1, the invention patent with application number 201310603232.1, "An intelligent sampler and sampling method for offshore oil wells", the sampler described in the patent includes a first solenoid valve, a second solenoid valve, a sampling cylinder, a piston, a return spring, a sample storage container, and a controller. The piston is arranged in the sampling cylinder, one end of the piston forms an inner cavity with the sampling cylinder, the return spring is arranged between the other end of the piston and the end face of the sampling cylinder, one end of the first solenoid valve is connected to the well fluid pipeline, and the other end is connected to the inner cavity of the sampling cylinder, one end of the second solenoid valve is connected to the inner cavity of the sampling cylinder, and the other end is connected to the sample storage container, the controller receives the signal of the multiphase flowmeter, and the output opening and closing signal of the controller is sent to the first solenoid valve and the second solenoid valve. This invention is only applicable to the installation of a sampler on the basis of the multiphase flowmeter of the offshore oil platform, and the controller can edit the software to realize the automation of the sampling process and perform continuous sampling, which is not applicable to the collection of oil samples in land oil wells.

[0004] Example 2, the invention patent with application number 201610315072.4, "A fully analytical oil sampling machine for high water-content oil wells", includes three parts: a mobile chassis, a liquid storage and processing machine, and an electrical automatic control machine; the mobile chassis part is composed of a push-pull handle, a partition, longitudinal partitions in the warp and weft directions, a gear train, a motor bracket, and a bottom plate; the liquid storage and processing part is composed of a funnel, a control valve І, an air balance gate, a solenoid valve, a vent valve, a sewage tank, an oil sample barrel, a bevel gear set, a DC motor, a stuffing box, a motor fixing plate, an exhaust pipe, a hot water (steam) spray pipe, a separator, a stirring rod, a buffer cap, a concave partition, a liquid inlet pipe, a sand retaining plate, and a sewage tank; the electrical automatic control part is composed of an audible and visual alarm, a detection body, a liquid level switch, a display screen, a control panel, an exhaust fan, a battery pack, a gas leakage alarm LHD, and a controller PLC; the mobile chassis is provided with a liquid storage and processing part. The present invention attempts to achieve automatic separation of oil, gas and water in the oil well output fluid through the electrical automatic control part and complete the quantitative oil sampling. However, the scheme is still in the experimental stage and has not been put into field use.

[0005] Example 3, the utility model patent "An intelligent sampling device for oil wells" with application number 201720233253.2, the sampling device includes a vertical guide tube, a sampling part, an anti-theft box, and an electrical intelligent control part; the sampling part of the intelligent sampling device for oil wells is vertically welded on the vertical guide tube, and the receiver and motor of the sampling part and the electrical intelligent control part are installed in the anti-theft box; the sampling valve of the sampling part is vertically installed at the lower part of the valve body and passes through the anti-theft box, the pressure control valve and the pressure gauge are vertically installed at the upper part of the valve body and pass through the anti-theft box, the power supply of the electrical intelligent control part is inserted through the power box socket, the power line column is plugged into the power jack, and connected to the receiver and the motor through the wire, and the motor drives the driven gear through the driving gear to drive the center rod to open or close the valve core. This utility model is operated by a remote control, and the valve switch is driven by a motor to sample, which is a conventional technology and does not reach the level of intelligent technology. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an oilfield intelligent sampling device and method, and its technical solution is as follows: An intelligent sampling device for oil fields comprises a signal acquisition module, an electric control module, a data storage unit, a data transmission unit, a data processing unit, a mixed liquid main pipe, a mixed liquid inlet, a sampling port and a mixed liquid outlet; the signal acquisition module is electrically connected to the data processing unit and is used to collect data when the oil well pipeline is in working state; the electric control module is electrically connected to the data processing unit and is used to realize the processing and sampling of the oil-water mixed liquid in the pipeline; the data storage unit is electrically connected to the data processing unit and is used to store the collected data; the data transmission unit is electrically connected to the data processing unit and is used to send the collected data to a central control room; the data processing unit is configured to control the signal acquisition module, the electric control module, the data storage unit and the data transmission unit to realize data collection, storage and transmission; the mixed liquid main pipe is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet and the mixed liquid outlet are located at the two ends of the mixed liquid main pipe, and the sampling port is located below the mixed liquid main pipe near the mixed liquid outlet.

[0007] Furthermore, the signal acquisition module includes a temperature acquisition unit for acquiring pipeline temperature data and a pressure acquisition unit for acquiring pressure data in the pipeline.

[0008] Furthermore, the electric control module includes a heating unit for heating the mixed liquid in the pipeline, a stirring unit for stirring the mixed liquid in the pipeline, and a valve control unit for controlling the flow direction of the mixed liquid in the pipeline.

[0009] Furthermore, the heating unit is heated by an electromagnetic coil.

[0010] Furthermore, the stirring unit includes a motor, a stirring rod and a stirring paddle. The motor is located outside the mixed liquid main pipe. The upper end of the stirring rod is mechanically connected to the motor and the lower end is mechanically connected to the stirring paddle. The stirring paddle is located in the center of the mixed liquid main pipe.

[0011] Furthermore, the valve control unit adopts an electric three-way valve.

[0012] Furthermore, the data transmission unit transmits data wirelessly.

[0013] An intelligent oilfield sampling method comprises the following steps: (1) Setting the time interval for sampling the oil-water mixture produced from the oil well through the data processing unit of the oilfield intelligent sampling device; (2) Turn on the heating unit of the oilfield intelligent sampling device to heat the oil-water mixture flowing through, quickly increase the temperature of the mixture, reduce the viscosity of the crude oil, and make the oil-water mixture easier to mix; (3) When the oil-water mixture flows through the stirring unit of the field intelligent sampling device, the stirring rod drives the stirring paddle to fully stir the oil-water mixture under the drive of the motor; (4) The oil-water mixture flows through the valve control unit of the oilfield intelligent sampling device and flows out through the sampling port instead of flowing into the original gathering pipeline of the oil well, so that the cross-sectional sampling or full sampling of the oil-water mixture produced from the oil well in the oil pipeline is realized instead of partial sampling, so that the sampled data is more representative; at the same time, the sampling time is stored in the data storage unit; (5) The signal acquisition module collects the temperature and pressure data of the oil-water mixture; at the same time, the temperature and pressure data are stored in the data storage unit; (6) The pressure, temperature and sampling time data of the data storage unit of the oilfield intelligent sampling device are wirelessly transmitted to the central control room through the data transmission unit.

[0014] Furthermore, the sampling time interval in step (1) is set to 1 hour, 2 hours, 5 hours, 8 hours, 12 hours or 24 hours.

[0015] Furthermore, the wireless transmission method in step (6) is ZigBee, LoRa, WIFI or GPRS.

[0016] Compared with the prior art, the present invention mainly has the following beneficial technical effects: The present invention makes the oil sample of the oil-water mixture at the wellhead of the oil well more uniform, can collect all the mixed liquid in the pipeline, and makes the sampled oil-water mixture more representative, can truly reflect the water content of the crude oil at the wellhead of the oil well, and ensures the accurate measurement of the oil well production. At the same time, the temperature and pressure of the oil-water mixture at the wellhead of the oil well can be collected in real time and the sampling time can be automatically recorded, and the collected data can be transmitted to the central control room by wireless means, thus improving the current digital and automated management level of oil fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a block diagram of the electrical working principle of the present invention; Figure 2 This is a block diagram of the electrical working principle of the signal acquisition module of the present invention; Figure 3 This is a block diagram of the electrical working principle of the electric control module of the present invention; Figure 4 It is a front view of the mechanical structure of the present invention; Figure 5 This is a schematic diagram of the installation structure of the current oil well sampling device in the oil field; Figure 6 This is a schematic diagram of the installation structure after the present invention is used on site in an oil field; In the figure: 1-signal acquisition module, 2-data storage unit, 3-data processing unit, 4-data transmission unit, 5-electric control module, 6-temperature acquisition unit, 7-pressure acquisition unit, 8-heating unit, 9-stirring unit, 9.1-motor, 9.2-stirring rod, 9.3-stirring paddle, 10-valve control unit, 11-mixed liquid inlet, 12-sampling port, 13-mixed liquid outlet, 14-mixed liquid main pipe, 15-original sampling valve, 16-oilfield intelligent sampling device. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the embodiments and drawings. Embodiment 1

[0019] like Figure 1 , Figure 2 and Figure 3 and Figure 4 As shown, an intelligent sampling device for oil fields includes a signal acquisition module 1, an electric control module 5, a data storage unit 2, a data transmission unit 4, a data processing unit 3, a mixed liquid main pipe 14, a mixed liquid inlet 11, a sampling port 12 and a mixed liquid outlet 13; the signal acquisition module 1 is electrically connected to the data processing unit 3 for collecting data when the oil well pipeline is in working state; the electric control module 5 is electrically connected to the data processing unit 3 for processing and sampling the oil-water mixed liquid in the pipeline; the data storage unit 2 is electrically connected to the data processing unit 3 for storing the collected data; the data transmission unit 4 is electrically connected to the data processing unit 3 for sending the collected data to the central control room; the data processing unit 3 is configured to control the signal acquisition module 1, the electric control module 5, the data storage unit 2 and the data transmission unit 4 to realize data collection, storage and transmission; the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet 11 and the mixed liquid outlet 13 are located at both ends of the mixed liquid main pipe 14, and the sampling port 12 is located below the mixed liquid main pipe 14 near the mixed liquid outlet 13.

[0020] The signal acquisition module 1 includes a temperature acquisition unit 6 for acquiring pipeline temperature data and a pressure acquisition unit 7 for acquiring pressure data in the pipeline. The temperature acquisition unit can use various temperature acquisition sensors such as PT100, PT1000, DS18B20, etc. The pressure acquisition unit 7 can be implemented in a bridge manner to convert physical pressure data into electrical signals for acquisition. Embodiment 2

[0021] like Figure 1 , Figure 2 and Figure 3 and Figure 4As shown, an intelligent sampling device for oil fields includes a signal acquisition module 1, an electric control module 5, a data storage unit 2, a data transmission unit 4, a data processing unit 3, a mixed liquid main pipe 14, a mixed liquid inlet 11, a sampling port 12 and a mixed liquid outlet 13; the signal acquisition module 1 is electrically connected to the data processing unit 3 for collecting data when the oil well pipeline is in working state; the electric control module 5 is electrically connected to the data processing unit 3 for processing and sampling the oil-water mixed liquid in the pipeline; the data storage unit 2 is electrically connected to the data processing unit 3 for storing the collected data; the data transmission unit 4 is electrically connected to the data processing unit 3 for sending the collected data to the central control room; the data processing unit 3 is configured to control the signal acquisition module 1, the electric control module 5, the data storage unit 2 and the data transmission unit 4 to realize data collection, storage and transmission; the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet 11 and the mixed liquid outlet 13 are located at both ends of the mixed liquid main pipe 14, and the sampling port 12 is located below the mixed liquid main pipe 14 near the mixed liquid outlet 13.

[0022] The signal acquisition module 1 includes a temperature acquisition unit 6 for acquiring pipeline temperature data and a pressure acquisition unit 7 for acquiring pressure data in the pipeline. The temperature acquisition unit can use various temperature acquisition sensors such as PT100, PT1000, DS18B20, etc. The pressure acquisition unit 7 can be implemented in a bridge manner to convert physical pressure data into electrical signals for acquisition.

[0023] The electric control module 5 includes a heating unit 8 for heating the mixed liquid in the pipeline, a stirring unit 9 for stirring the mixed liquid in the pipeline, and a valve control unit 10 for controlling the flow direction of the mixed liquid in the pipeline. Embodiment 3

[0024] like Figure 1 , Figure 2 and Figure 3 and Figure 4As shown, an intelligent sampling device for oil fields includes a signal acquisition module 1, an electric control module 5, a data storage unit 2, a data transmission unit 4, a data processing unit 3, a mixed liquid main pipe 14, a mixed liquid inlet 11, a sampling port 12 and a mixed liquid outlet 13; the signal acquisition module 1 is electrically connected to the data processing unit 3 for collecting data when the oil well pipeline is in working state; the electric control module 5 is electrically connected to the data processing unit 3 for processing and sampling the oil-water mixed liquid in the pipeline; the data storage unit 2 is electrically connected to the data processing unit 3 for storing the collected data; the data transmission unit 4 is electrically connected to the data processing unit 3 for sending the collected data to the central control room; the data processing unit 3 is configured to control the signal acquisition module 1, the electric control module 5, the data storage unit 2 and the data transmission unit 4 to realize data collection, storage and transmission; the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet 11 and the mixed liquid outlet 13 are located at both ends of the mixed liquid main pipe 14, and the sampling port 12 is located below the mixed liquid main pipe 14 near the mixed liquid outlet 13.

[0025] The signal acquisition module 1 includes a temperature acquisition unit 6 for acquiring pipeline temperature data and a pressure acquisition unit 7 for acquiring pressure data in the pipeline. The temperature acquisition unit can use various temperature acquisition sensors such as PT100, PT1000, DS18B20, etc. The pressure acquisition unit 7 can be implemented in a bridge manner to convert physical pressure data into electrical signals for acquisition.

[0026] The electric control module 5 includes a heating unit 8 for heating the mixed liquid in the pipeline, a stirring unit 9 for stirring the mixed liquid in the pipeline, and a valve control unit 10 for controlling the flow direction of the mixed liquid in the pipeline.

[0027] The heating unit 8 is heated by electromagnetic coils. In practical applications, due to the different physical properties of crude oil, the wax content, viscosity, temperature, water content, etc. of different oil well production fluids (oil-water mixtures) are different, resulting in poor fluidity of the oil-water mixture. At low temperatures, crude oil is easily agglomerated, resulting in complete separation of oil and water. At the same time, due to the existing sampling method, only part of the oil-water mixture is collected during mixed liquid sampling, resulting in a high water content in the test results. In view of this part of the reason, the present invention adds the heating unit 8 and uses electromagnetic coils for heating, which has the advantages of fast heating, high efficiency, and easy installation. Heating by the heating unit 8 can increase the temperature of the oil-water mixture, enhance the fluidity of crude oil, reduce the viscosity of crude oil, and facilitate the mixing of crude oil and water. Embodiment 4

[0028] like Figure 1 , Figure 2 and Figure 3 and Figure 4As shown, an intelligent sampling device for oil fields includes a signal acquisition module 1, an electric control module 5, a data storage unit 2, a data transmission unit 4, a data processing unit 3, a mixed liquid main pipe 14, a mixed liquid inlet 11, a sampling port 12 and a mixed liquid outlet 13; the signal acquisition module 1 is electrically connected to the data processing unit 3 for collecting data when the oil well pipeline is in working state; the electric control module 5 is electrically connected to the data processing unit 3 for processing and sampling the oil-water mixed liquid in the pipeline; the data storage unit 2 is electrically connected to the data processing unit 3 for storing the collected data; the data transmission unit 4 is electrically connected to the data processing unit 3 for sending the collected data to the central control room; the data processing unit 3 is configured to control the signal acquisition module 1, the electric control module 5, the data storage unit 2 and the data transmission unit 4 to realize data collection, storage and transmission; the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet 11 and the mixed liquid outlet 13 are located at both ends of the mixed liquid main pipe 14, and the sampling port 12 is located below the mixed liquid main pipe 14 near the mixed liquid outlet 13.

[0029] The signal acquisition module 1 includes a temperature acquisition unit 6 for acquiring pipeline temperature data and a pressure acquisition unit 7 for acquiring pressure data in the pipeline. The temperature acquisition unit can use various temperature acquisition sensors such as PT100, PT1000, DS18B20, etc. The pressure acquisition unit 7 can be implemented in a bridge manner to convert physical pressure data into electrical signals for acquisition.

[0030] The electric control module 5 includes a heating unit 8 for heating the mixed liquid in the pipeline, a stirring unit 9 for stirring the mixed liquid in the pipeline, and a valve control unit 10 for controlling the flow direction of the mixed liquid in the pipeline.

[0031] The heating unit 8 is heated by electromagnetic coils. In practical applications, due to the different physical properties of crude oil, the wax content, viscosity, temperature, water content, etc. of different oil well production fluids (oil-water mixtures) are different, resulting in poor fluidity of the oil-water mixture. At low temperatures, crude oil is easily agglomerated, resulting in complete separation of oil and water. At the same time, due to the existing sampling method, only part of the oil-water mixture is collected during mixed liquid sampling, resulting in a high water content in the test results. In view of this part of the reason, the present invention adds the heating unit 8 and uses electromagnetic coils for heating, which has the advantages of fast heating, high efficiency, and easy installation. Heating by the heating unit 8 can increase the temperature of the oil-water mixture, enhance the fluidity of crude oil, reduce the viscosity of crude oil, and facilitate the mixing of crude oil and water.

[0032] The stirring unit 9 comprises a motor 9.1, a stirring rod 9.2 and a stirring paddle 9.3. The motor 9.1 is located outside the mixed liquid main pipe 14. The upper end of the stirring rod 9.2 is mechanically connected to the motor 9.1, and the lower end is mechanically connected to the stirring paddle 9.3. The stirring paddle 9.3 is located in the center of the mixed liquid main pipe 14. The stirring paddle 9.3 can be a two-leaf, three-leaf, U-shaped structure, etc. The rotation of the motor 9.1 drives the stirring paddle 9.3 to rotate, and the crude oil and water are evenly stirred. Embodiment 5

[0033] like Figure 1 , Figure 2 and Figure 3 and Figure 4 As shown, an intelligent sampling device for oil fields includes a signal acquisition module 1, an electric control module 5, a data storage unit 2, a data transmission unit 4, a data processing unit 3, a mixed liquid main pipe 14, a mixed liquid inlet 11, a sampling port 12 and a mixed liquid outlet 13; the signal acquisition module 1 is electrically connected to the data processing unit 3 for collecting data when the oil well pipeline is in working state; the electric control module 5 is electrically connected to the data processing unit 3 for processing and sampling the oil-water mixed liquid in the pipeline; the data storage unit 2 is electrically connected to the data processing unit 3 for storing the collected data; the data transmission unit 4 is electrically connected to the data processing unit 3 for sending the collected data to the central control room; the data processing unit 3 is configured to control the signal acquisition module 1, the electric control module 5, the data storage unit 2 and the data transmission unit 4 to realize data collection, storage and transmission; the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet 11 and the mixed liquid outlet 13 are located at both ends of the mixed liquid main pipe 14, and the sampling port 12 is located below the mixed liquid main pipe 14 near the mixed liquid outlet 13.

[0034] The signal acquisition module 1 includes a temperature acquisition unit 6 for acquiring pipeline temperature data and a pressure acquisition unit 7 for acquiring pressure data in the pipeline. The temperature acquisition unit can use various temperature acquisition sensors such as PT100, PT1000, DS18B20, etc. The pressure acquisition unit 7 can be implemented in a bridge manner to convert physical pressure data into electrical signals for acquisition.

[0035] The electric control module 5 includes a heating unit 8 for heating the mixed liquid in the pipeline, a stirring unit 9 for stirring the mixed liquid in the pipeline, and a valve control unit 10 for controlling the flow direction of the mixed liquid in the pipeline.

[0036] The heating unit 8 is heated by electromagnetic coils. In practical applications, due to the different physical properties of crude oil, the wax content, viscosity, temperature, water content, etc. of different oil well production fluids (oil-water mixtures) are different, resulting in poor fluidity of the oil-water mixture. At low temperatures, crude oil is easily agglomerated, resulting in complete separation of oil and water. At the same time, due to the existing sampling method, only part of the oil-water mixture is collected during mixed liquid sampling, resulting in a high water content in the test results. In view of this part of the reason, the present invention adds the heating unit 8 and uses electromagnetic coils for heating, which has the advantages of fast heating, high efficiency, and easy installation. Heating by the heating unit 8 can increase the temperature of the oil-water mixture, enhance the fluidity of crude oil, reduce the viscosity of crude oil, and facilitate the mixing of crude oil and water.

[0037] The stirring unit 9 comprises a motor 9.1, a stirring rod 9.2 and a stirring paddle 9.3. The motor 9.1 is located outside the mixed liquid main pipe 14. The upper end of the stirring rod 9.2 is mechanically connected to the motor 9.1, and the lower end is mechanically connected to the stirring paddle 9.3. The stirring paddle 9.3 is located in the center of the mixed liquid main pipe 14. The stirring paddle 9.3 can be a two-leaf, three-leaf, U-shaped structure, etc. The rotation of the motor 9.1 drives the stirring paddle 9.3 to rotate, and the crude oil and water are evenly stirred.

[0038] The valve control unit 10 adopts an electric three-way valve. When the wellhead oil-water mixture is not sampled, the oil-water mixture can directly enter the mixture outlet 13 through the electric three-way valve and flow into the original gathering pipeline; when the wellhead oil-water mixture is sampled, under the control of the data processing unit 3, the electric three-way valve is configured so that the stirred oil-water mixture flows out through the sampling port 12 and flows into the sampling bucket prepared by the sampler, and the oil-water mixture no longer flows into the mixture outlet 13, nor into the original gathering pipeline of the oil well. In this way, all the mixed liquid in the pipeline can be obtained, and the cross-sectional sampling of the mixed liquid in the pipeline can be realized, so that the sampled sample is more representative; after the sampling is completed, the sampler takes the sampling bucket and sends it to the laboratory for testing, thereby obtaining the water content of the crude oil.

[0039] The data transmission unit 4 transmits data wirelessly. Embodiment 6

[0040] like Figure 1 , Figure 2 and Figure 3 and Figure 4 As shown, an intelligent oilfield sampling method comprises the following steps: (1) Setting the time interval for sampling the oil-water mixture produced from the oil well through the data processing unit of the oilfield intelligent sampling device; the sampling time interval is set to 1 hour, 2 hours, 5 hours, 8 hours, 12 hours or 24 hours; (2) Turn on the heating unit 8 of the oilfield intelligent sampling device to heat the oil-water mixture flowing through, quickly increase the temperature of the mixture, reduce the viscosity of the crude oil, and make the oil-water mixture easier to mix; (3) When the oil-water mixture flows through the stirring unit 9 of the field intelligent sampling device, the stirring rod 9.2 drives the stirring paddle 9.3 to fully stir the oil-water mixture under the drive of the motor 9.1; (4) The oil-water mixture flows through the valve control unit 10 of the oilfield intelligent sampling device and flows out through the sampling port 12, instead of flowing into the original gathering pipeline of the oil well, so that cross-sectional sampling or full sampling of the oil-water mixture produced from the oil well in the oil pipe is achieved, rather than partial sampling, so that the sampled data is more representative; at the same time, the sampling time is stored in the data storage unit 3; (5) The signal acquisition module 1 acquires the temperature and pressure data of the oil-water mixture; meanwhile, the temperature and pressure data are stored in the data storage unit 3; (6) The pressure, temperature and sampling time data of the data storage unit 3 of the oilfield intelligent sampling device are wirelessly transmitted to the central control room through the data transmission unit 4; the wireless transmission method is ZigBee, LoRa, WIFI or GPRS, which can achieve long-distance transmission.

[0041] Comparative Example 1 Figure 5 The present invention is a schematic diagram of the structure of an oil well sampling device currently commonly used in oil fields. The present invention mainly comprises one end of a seamless steel pipe welded in the vertical direction of a vertical guide pipe at the wellhead of an oil well, and an original sampling valve 15 is installed at the other end of the seamless steel pipe. The oil-water mixture of the oil well is sampled by opening and closing the original sampling valve 15. This mode is simple to install, but causes uneven mixing of the sampled oil-water mixture, and cannot sample all the mixed liquid in the pipeline. The sampled mixed liquid is less representative.

[0042] Application Example 1 Figure 6 The schematic diagram of the installation structure of the oilfield intelligent sampling device 16 of the present invention is shown in FIG. Figure 1 , Figure 2 , Figure 3 and Figure 4, the mixed liquid main pipe 14 is connected in series to the wellhead transverse pipe of the oil well, so that the oil-water mixed liquid produced by the oil well flows through the heating unit 8, the stirring unit 9, and the valve control unit 10 in sequence. Under the control of the data processing unit 3, the temperature acquisition unit 6 and the pressure acquisition unit 7 collect the pressure and temperature data in the oil well pipeline in real time, and store the collected pressure and temperature data in the data storage unit 2. Through the implementation of the present invention, the oil-water mixed liquid at the wellhead of the oil well to be sampled can be made more uniform, all the mixed liquid in the pipeline can be collected, and the sampled oil-water mixed liquid can be more representative, and can truly reflect the water content of the crude oil at the wellhead of the oil well. At the same time, the temperature and pressure of the oil-water mixed liquid at the wellhead of the oil well can be collected in real time and the sampling time can be automatically recorded. The collected data can be transmitted to the central control room by wireless means, thereby improving the digitalization and automation management level of the oil field.

Claims

1. An intelligent oilfield sampling device, characterized in that: It includes a signal acquisition module, an electric control module, a data storage unit, a data transmission unit, a data processing unit, a mixed liquid main pipe, a mixed liquid inlet, a sampling port and a mixed liquid outlet; the signal acquisition module is electrically connected to the data processing unit and is used to collect data when the oil well pipeline is in working state; the electric control module is electrically connected to the data processing unit and is used to realize the processing and sampling of the oil-water mixed liquid in the pipeline; the data storage unit is electrically connected to the data processing unit and is used to save the collected data; the data transmission unit is electrically connected to the data processing unit and is used to send the collected data to the central control room; the data processing unit is configured to control the signal acquisition module, the electric control module, the data storage unit and the data transmission unit to realize data collection, storage and transmission; the mixed liquid main pipe is connected in series to the wellhead transverse pipe of the oil well, the mixed liquid inlet and the mixed liquid outlet are located at the two ends of the mixed liquid main pipe, and the sampling port is located below the mixed liquid main pipe near the mixed liquid outlet.

2. The intelligent oilfield sampling device according to claim 1, characterized in that: The signal acquisition module includes a temperature acquisition unit for acquiring pipeline temperature data and a pressure acquisition unit for acquiring pressure data in the pipeline.

3. The intelligent oilfield sampling device according to claim 1, characterized in that: The electric control module includes a heating unit for heating the mixed liquid in the pipeline, a stirring unit for stirring the mixed liquid in the pipeline, and a valve control unit for controlling the flow direction of the mixed liquid in the pipeline.

4. The intelligent oilfield sampling device according to claim 3, characterized in that: The heating unit is heated by an electromagnetic coil.

5. The intelligent oilfield sampling device according to claim 3, characterized in that: The stirring unit comprises a motor, a stirring rod and a stirring paddle. The motor is located outside the mixed liquid main pipe. The upper end of the stirring rod is mechanically connected to the motor and the lower end is mechanically connected to the stirring paddle. The stirring paddle is located in the center of the mixed liquid main pipe.

6. The intelligent oilfield sampling device according to claim 3, characterized in that: The valve control unit adopts an electric three-way valve.

7. The intelligent oilfield sampling device according to claim 1, characterized in that: The data transmission unit transmits data wirelessly.

8. An intelligent oilfield sampling method, characterized in that: The following steps are involved: (1) Setting the time interval for sampling the oil-water mixture produced from the oil well through the data processing unit of the oilfield intelligent sampling device; (2) Turn on the heating unit of the oilfield intelligent sampling device to heat the oil-water mixture flowing through, quickly increase the temperature of the mixture, reduce the viscosity of the crude oil, and make the oil-water mixture easier to mix; (3) When the oil-water mixture flows through the stirring unit of the field intelligent sampling device, the stirring rod drives the stirring paddle to fully stir the oil-water mixture under the drive of the motor; (4) The oil-water mixture flows through the valve control unit of the oilfield intelligent sampling device and flows out through the sampling port instead of flowing into the original gathering pipeline of the oil well, so that the cross-sectional sampling or full sampling of the oil-water mixture produced from the oil well in the oil pipeline is realized instead of partial sampling, so that the sampled data is more representative; at the same time, the sampling time is stored in the data storage unit; (5) The signal acquisition module collects the temperature and pressure data of the oil-water mixture; at the same time, the temperature and pressure data are stored in the data storage unit; (6) The pressure, temperature and sampling time data of the data storage unit of the oilfield intelligent sampling device are wirelessly transmitted to the central control room through the data transmission unit.

9. An intelligent oilfield sampling method according to claim 8, characterized in that: The sampling time interval in step (1) is set to 1 hour, 2 hours, 5 hours, 8 hours, 12 hours or 24 hours.

10. An intelligent oilfield sampling method according to claim 8, characterized in that: The wireless transmission method in step (6) is ZigBee, LoRa, WIFI or GPRS.

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