Device and method for measuring oil-water content in petroleum production logging

Abstract

The invention relates to the technical field of measuring devices, and provides an oil-water content measuring device and method for oil production logging, the oil-water content measuring device for oil production logging comprises a device shell, a control assembly is fixedly installed on the device shell, a first pipeline is fixedly installed in the device shell, and a second pipeline is fixedly installed in the device shell. The two ends of the first pipeline are both located outside the device shell, the first valve is fixedly installed on the first pipeline, the branch assembly is installed in the device shell, the moisture content measuring instrument is installed on the branch assembly, the mixing assembly is installed on the branch assembly, and the mixing assembly is installed on the water content measuring instrument. By means of the technical scheme, the problem that in the prior art, due to the fact that the flowing time of petroleum is long, the petroleum is separated from water, and the detection result is inaccurate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring devices, and in particular to a device and method for measuring oil-water content in oil production logging. Background Art

[0002] The main purpose of oil production logging is to obtain various petroleum geological and engineering technical information. As the original data for well completion and oil field development, this type of logging can directly provide various information and data for petroleum geologists and engineering technicians. It is one of the important means to determine and evaluate oil and gas layers, and it is also an important means to solve a series of geological problems.

[0003] Oil is usually stored in the pores of underground rocks, which often contain groundwater. In the process of oil extraction, this water will be extracted along with the oil. Crude oil with a high water content is more likely to form sediments during transportation, increasing the risk of blockage in oil and gas pipelines, affecting the transportation efficiency of oil. It will also accelerate the corrosion process of storage and transportation facilities, shorten the service life of equipment, and increase maintenance costs. Therefore, it is necessary to detect the water content of the extracted oil. When the oil flows in the pipeline for a long time, the water in the oil will separate from the oil. At this time, when detecting the water content of the oil, inaccurate detection is likely to occur, which greatly affects the accuracy of the detection of the water content of the oil. Summary of the invention

[0004] The invention provides a device for measuring the oil-water content in oil production logging, which solves the problem in the prior art that the oil flow time is long, resulting in the separation of oil and water, causing inaccurate detection results.

[0005] The technical solution of the present invention is as follows: A device for measuring oil-water content in oil production logging, comprising a device housing, a control assembly fixedly mounted on the device housing, a first pipeline fixedly mounted inside the device housing, both ends of the first pipeline being located outside the device housing, and further comprising: a first valve, wherein the first valve is fixedly installed on the first pipeline; A branch circuit component is installed inside the device housing; A water content measuring instrument, the water content measuring instrument is installed on the branch assembly, and the branch assembly is used to transport oil to the water content measuring instrument for detection; A mixing assembly is installed on the branch assembly and is used to mix the petroleum and oilfield water mixed in the petroleum.

[0006] On the basis of the above scheme, the branch circuit assembly comprises: An input pipeline, the input pipeline is connected to the first pipeline; an output pipeline, the output pipeline is connected to the first pipeline, and the first valve is located between the input pipeline and the output pipeline; A central through pipeline, wherein the central through pipeline is fixedly installed inside the housing of the device; Wherein, the output end of the moisture content measuring instrument is communicated with the output pipeline, and the input end of the moisture content measuring instrument is communicated with the middle-through pipeline.

[0007] On the basis of the above scheme, the mixing assembly comprises: A mixing shell, the mixing shell is connected between the input pipeline and the middle through pipeline, and the mixing shell includes a mixing section and a primary mixing section; A mixing unit, which is installed inside the mixing section and is used to mix petroleum and oilfield water; A driving unit, the driving unit is installed inside the mixing unit and is used to drive the mixing unit to move; A premixing section is installed inside the primary mixing section and is used to pre-stir the petroleum and oilfield water before mixing them.

[0008] In addition to the above solutions, it also includes: a second valve, the second valve being fixedly mounted on the input pipeline; A third valve is fixedly installed on the output pipeline.

[0009] On the basis of the above scheme, it also includes a flow detection device, which is installed on the first pipeline. The flow detection device includes a flow detector, which is fixedly installed on the first pipeline. The flow detector is located between the end of the first pipeline and the connecting position between the output pipeline and the first pipeline.

[0010] On the basis of the above scheme, the mixing unit comprises: A mounting frame, the mounting frame being fixedly mounted inside the mixing housing: A stirring shaft, two stirring shafts are symmetrically and rotatably mounted on the mounting frame, and the two stirring shafts are coaxially arranged with the mixing housing; The stirring members are provided with a plurality of groups of stirring members fixedly mounted at equal angles in a circle on the two stirring shafts, each stirring member is provided with a plurality of stirring rods, and the plurality of stirring rods of each group of stirring members are arranged equidistantly along the axis direction of the stirring shaft.

[0011] In addition to the above solutions, it also includes: Mixing racks, a plurality of said mixing racks are fixedly installed at equal angles in a circular shape on both sides of the interior of the mixing shell; Through grooves, each of the mixing racks is provided with a plurality of through grooves at equal distances, and the through grooves correspond to the stirring rods.

[0012] On the basis of the above scheme, the driving unit comprises: A driving shaft, wherein the driving shaft is rotatably mounted inside the mounting frame; A first motor, wherein the first motor is fixedly mounted on the mounting frame, and an output end of the first motor is fixedly connected to the driving shaft; A driven helical gear, on the ends of the two stirring shafts, the driven helical gear is fixedly mounted; A driving helical gear is fixedly mounted on the driving shaft and is meshed with the two driven helical gears respectively.

[0013] On the basis of the above scheme, the premixing unit comprises: A mixing disk, the mixing disk is symmetrically and fixedly installed inside the primary mixing section; A groove body group, wherein the two mixing disks are provided with a plurality of groove body groups arranged at equal angles in a circumferential shape, and each groove body group comprises a plurality of spiral grooves arranged at equal angles in a circumferential shape; Wherein, the rotation directions of each two adjacent groups of spiral grooves are opposite.

[0014] A method for measuring the oil-water content in oil production logging, using the above-mentioned oil-water content measuring device in oil production logging, comprises the following steps: S1, diversion, close the first valve, open the second valve and the third valve, at this time the oil entering the first pipeline will enter the input pipeline; S2, initial mixing. After the oil enters the input pipeline, it will enter the mixing shell. The oil will first pass through the initial mixing section and then enter the mixing section. After the mixture of oil and water enters the initial mixing section, as the oil flows, the oil will pass through the spiral grooves on the mixing disk for initial mixing; S3, drive, after the oil enters the mixing section, the first motor drives the active bevel gear to rotate through the driving shaft, and the active bevel gear drives the two driven bevel gears to rotate in the opposite direction at the same time, thereby driving the two stirring shafts to rotate in the opposite direction at the same time; S4, stirring, the stirring shaft drives the stirring rod to rotate around the axis position of the stirring rod, thereby stirring the oil entering the mixing shell; S5, water content measurement, through the middle pipe, the oil can enter the water content measuring instrument to measure the water content of the oil online, and the measurement results are transmitted to the control assembly in real time for analysis and recording; S6, flow measurement, during the process of transporting the oil through the first pipeline, the oil passes through the flow detector, and the flow detector is started to detect it, so as to output the data to the control assembly for processing and recording.

[0015] The working principle and beneficial effects of the present invention are: 1. In the present invention, the stirring shaft drives the stirring rod to rotate, thereby stirring the oil entering the mixing shell. As the stirring shaft drives the stirring rod to stir the oil, the stirring rod will continuously pass through the through slot at the corresponding position on the mixing frame. The length and width of the stirring rod are slightly smaller than the size of the through slot. When the stirring rod passes through the through slot, a small-scale eddy current will appear at the intersection, thereby further improving the uniformity of the oil and water, thereby improving the measurement accuracy.

[0016] 2. In the present invention, the oil will pass through the spiral grooves on the mixing disk. Each mixing disk is provided with multiple sets of spiral grooves, and each set of spiral grooves is nested in a ring. After passing through the spiral grooves, the oil and water will automatically undergo preliminary mixing under the guidance of the spiral grooves, thereby improving the uniformity of the oil and water, thereby improving the accuracy of the measurement.

[0017] 3. In the present invention, by setting up the branch assembly, the water content of the oil can be measured without stopping the transportation, and by setting up the mixing assembly, the uniformity of the oil and the water present in the oil is greatly improved, thereby improving the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional structure in cross section in the present invention; Figure 3 It is a schematic diagram of the structure of the branch component and the mixing component in the present invention; Figure 4 is a schematic cross-sectional structural diagram of the mixing assembly in the present invention; Figure 5 is a schematic cross-sectional structural diagram of a mixing assembly from another angle in the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the mixing part and the driving part in the present invention; Figure 7 It is a cross-sectional structural schematic diagram of the driving part in the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the premixing unit in the present invention.

[0020] In the figure: 1. device housing; 2. control assembly; 3. first pipeline; 4. first valve; 5. moisture content measuring instrument; 6. input pipeline; 7. output pipeline; 8. middle pipeline; 9. second valve; 10. third valve; 11. flow detector; 12. mixing housing; 13. mounting frame; 14. stirring shaft; 15. stirring rod; 16. mixing frame; 17. through groove; 18. driving shaft; 19. first motor; 20. driven bevel gear; 21. driving bevel gear; 22. mixing disk; 23. spiral groove. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 like Figures 1 to 8 As shown, this embodiment proposes an oil-water content measuring device in petroleum production logging, including a device housing 1, a control assembly 2 is fixedly installed on the device housing 1, a first pipeline 3 is fixedly installed inside the device housing 1, both ends of the first pipeline 3 are located outside the device housing 1, and also includes a first valve 4, a branch assembly, a water content measuring instrument 5 and a mixing assembly, the first valve 4 is fixedly installed on the first pipeline 3, a branch assembly is installed inside the device housing 1, the branch assembly includes an input pipeline 6, an output pipeline 7 and a middle pipeline 8, the input pipeline 6 is connected to the first pipeline 3, the output pipeline 7 is connected to the first pipeline 3, the first valve 4 is located between the input pipeline 6 and the output pipeline 7, the middle pipeline 8 is fixedly installed inside the device housing 1, wherein the output end of the water content measuring instrument 5 is connected to the output pipeline 7, and the input end of the water content measuring instrument 5 is connected to the middle pipeline 8, and also includes a second valve 9 and a third valve 10, the second valve 9 is fixedly installed on the input pipeline 6, and the third valve 10 is fixedly installed on the output pipeline 7.

[0023] Specifically, during the oil transportation process, the second valve 9 and the third valve 10 are in a closed state, and the first valve 4 is in an open state. At this time, the oil enters the first pipeline 3, and after passing through the first valve 4 and the flow detector 11, it can be discharged into the next pipeline or the next link. When it is necessary to measure the water content of the oil, the first valve 4 is closed, and the second valve 9 and the third valve 10 are opened. At this time, the oil entering the first pipeline 3 will enter the input pipeline 6, pass through the mixing component, and enter the middle pipeline 8. After passing through the middle pipeline 8, it passes through the water content detector and enters the output pipeline 7, and then returns to the first pipeline 3. When the oil passes through the water content detector, the water content detector is started to measure the water content of the oil online, and the measurement results are transmitted to the control assembly 2 in real time for analysis and recording.

[0024] It should be added that the control assembly 2 in the present application is electrically connected to the first valve 4, the second valve 9, the third valve 10, the moisture content measuring instrument 5, the flow detector 11 and the first motor 19 respectively, so as to control them and record data.

[0025] It should be noted that online measurement technology refers to the real-time monitoring of the proportion of water in oil by sensors on the detector during oil production to provide continuous data, which helps to adjust production strategies in a timely manner. The water content detector in this application preferably uses capacitive sensor technology, that is, the measured oil water content is converted into a change in capacitance, which is converted into a suitable electrical signal through a measurement conversion circuit and output to the control assembly 2 for processing and recording. This can realize full remote online measurement of oil water content, which is simple, safe, convenient, reliable and fast to operate.

[0026] However, it should be noted that there are many other online measurement methods, such as density meter method, X-ray method, radio frequency method, shortwave method and microwave method, etc., which can be freely selected according to actual conditions and will not be elaborated here.

[0027] The above, such as Figure 3 As shown, it also includes a flow detection device, which is installed on the first pipeline 3. The flow detection device includes a flow detector 11, which is fixedly installed on the first pipeline 3. The flow detector 11 is located between the end of the first pipeline 3 and the connecting position between the output pipeline 7 and the first pipeline 3. The water content measuring instrument 5 is installed on the branch assembly, and the branch assembly is used to transport the oil to the water content measuring instrument 5 for detection; Specifically, in the process of transporting oil through the first pipeline 3, or when the oil passes through the input pipeline 6 and the output pipeline 7, after the water content is detected, it will pass through the flow detector 11, and the flow detector 11 will be started to detect it, so that the data can be output to the control assembly 2 for processing and recording.

[0028] It should be added that the flow detector 11 preferably adopts a turbine flowmeter, whose working principle is to install a sensor on the turbine shaft and measure the flow rate of oil in the oil well by measuring the number of rotations of the turbine, and the measurement accuracy is relatively high.

[0029] like Figures 3 to 8 As shown, a mixing assembly is installed on the branch assembly for mixing the petroleum and oilfield water mixed in the petroleum. The mixing assembly includes a mixing shell 12, a mixing part, a driving part and a premixing part. The mixing shell 12 is connected between the input pipeline 6 and the middle pipeline 8. The mixing shell 12 includes a mixing section and a primary mixing section. The mixing section is installed inside the mixing section for mixing the petroleum and the oilfield water. The driving part is installed inside the mixing section for driving the mixing part to move. The premixing part is installed inside the primary mixing section for pre-stirring the petroleum and the oilfield water before mixing them.

[0030] Specifically, when it is necessary to test the oil, after the oil enters the input pipeline 6, it will enter the inside of the mixing shell 12. The oil will first pass through the primary mixing section and then enter the mixing section. In order to make the oil and water uniform, when the oil passes through the primary mixing section, the oil and water are preliminarily mixed through the setting of the premixing section. When the oil enters the mixing section, the driving section is started to drive the mixing section to mix the oil and water in the mixing shell 12, and then it is discharged into the middle pipe 8. Through the middle pipe 8, it can enter the water content measuring instrument 5 to detect the water content of the oil, thereby improving the uniformity of the oil and water, and thus improving the accuracy of the detection.

[0031] The above, such as Figure 5 , Figure 6 As shown, the mixing part includes a mounting frame 13, a stirring shaft 14 and a stirring member. The mounting frame 13 is fixedly installed inside the mixing shell 12. Two stirring shafts 14 are symmetrically and rotatably installed on the mounting frame 13. The two stirring shafts 14 are coaxially arranged with the mixing shell 12. Multiple groups of stirring members are fixedly installed at equal angles in a circular shape on the two stirring shafts 14. Each stirring member is provided with multiple stirring rods 15. The multiple stirring rods 15 of each group of stirring members are equidistantly arranged along the axial direction of the stirring shaft 14. It also includes a mixing frame 16 and a through groove 17. Multiple mixing frames 16 are fixedly installed at equal angles in a circular shape on both sides of the mixing shell 12. Multiple through grooves 17 are evenly spaced on each mixing frame 16, and the through grooves 17 correspond to the stirring rods 15.

[0032] Specifically, when stirring is required, the two stirring shafts 14 are driven to rotate in opposite directions at the same time, and the stirring shaft 14 drives the stirring rod 15 to rotate around the axial position of the stirring rod 15, so as to stir the oil entering the mixing shell 12. As the stirring shaft 14 drives the stirring rod 15 to stir the oil, the stirring rod 15 will continuously pass through the through groove 17 at the corresponding position on the mixing frame 16. The length and width of the stirring rod 15 are slightly smaller than the size of the through groove 17. When the stirring rod 15 passes through the through groove 17, a small-scale vortex will appear at the intersection, thereby further improving the uniformity of the oil and water.

[0033] The above, such as Figure 6 , Figure 7 As shown, the driving part includes a driving shaft 18, a first motor 19, a driven bevel gear 20 and a driving bevel gear 21. The driving shaft 18 is rotatably installed inside the mounting frame 13, the first motor 19 is fixedly installed on the mounting frame 13, the output end of the first motor 19 is fixedly connected to the driving shaft 18, the ends of the two stirring shafts 14 are fixedly installed with driven bevel gears 20, and the driving bevel gear 21 is fixedly installed on the driving shaft 18, and the driving bevel gear 21 is respectively meshed with the two driven bevel gears 20.

[0034] Specifically, when driving the two stirring shafts 14 to rotate, the first motor 19 is started, the first motor 19 drives the driving column to rotate, the driving shaft 18 drives the active bevel gear 21 to rotate, and the active bevel gear 21 drives the two driven bevel gears 20 to rotate in the opposite direction at the same time, thereby driving the two stirring shafts 14 to rotate in the opposite direction at the same time.

[0035] The above, such as Figure 8 As shown, the premixing section includes a mixing disk 22 and a slot body group. The mixing disk 22 is symmetrically and fixedly installed inside the primary mixing section. Multiple groups of slot body groups are arranged in a circular shape at equal angles inside the two mixing disks 22. Each group of slot body groups includes multiple spiral grooves 23 arranged in a circular shape at equal angles, wherein the rotation directions of each two adjacent groups of spiral grooves 23 are opposite.

[0036] Specifically, when the mixture of oil and water enters the primary mixing section, the oil will pass through the spiral groove 23 on the mixing disk 22 as the oil flows. Figure 8 It can be seen that each mixing disk 22 is provided with multiple groups of spiral grooves 23, and each group of spiral grooves 23 is nested in a ring. After passing through the spiral grooves 23, the oil and water will automatically undergo preliminary mixing under the guidance of the spiral grooves 23, thereby improving the accuracy of detection.

[0037] The working principle or usage process of this application is: During the oil transportation process, the second valve 9 and the third valve 10 are in a closed state, and the first valve 4 is in an open state. At this time, the oil enters the first pipeline 3, and after passing through the first valve 4 and the flow detector 11, it can be discharged into the next pipeline or the next link. When it is necessary to measure the water content of the oil, the first valve 4 is closed, and the second valve 9 and the third valve 10 are opened. At this time, the oil entering the first pipeline 3 will enter the input pipeline 6. After the oil enters the input pipeline 6, it will enter the inside of the mixing shell 12. The oil will first pass through the primary mixing section and then enter the mixing section. After the mixture of oil and water enters the primary mixing section, as the oil flows, the oil will pass through the spiral groove 23 on the mixing disk 22. After passing through the spiral groove 23, the oil and water will automatically perform preliminary mixing under the guidance of the spiral groove 23, thereby improving the accuracy of the detection.

[0038] When the oil enters the mixing section, the first motor 19 is started, the first motor 19 drives the driving column to rotate, the driving shaft 18 drives the active bevel gear 21 to rotate, the active bevel gear 21 drives the two driven bevel gears 20 to rotate in the opposite direction at the same time, thereby driving the two stirring shafts 14 to rotate in the opposite direction at the same time, and the stirring shaft 14 drives the stirring rod 15 to rotate around the axis position of the stirring rod 15, thereby stirring the oil entering the mixing shell 12. As the stirring shaft 14 drives the stirring rod 15 to stir the oil, the stirring rod 15 will continuously pass through the through groove 17 at the corresponding position on the mixing frame 16. The length and width of the stirring rod 15 are slightly smaller than the size of the through groove 17. When the stirring rod 15 passes through the through groove 17, a small range of eddy currents will appear at the intersection position, thereby further improving the uniformity of the oil and water, and then it will be discharged into the middle through pipeline 8. Through the middle through pipeline 8, it can enter the water content measuring instrument 5 to measure the water content of the oil online, and the measured results are transmitted to the control assembly 2 in real time for analysis and recording, thereby improving the accuracy of the detection.

[0039] During the process of transporting oil through the first pipeline 3, or when the oil passes through the input pipeline 6 and the output pipeline 7, after the water content is detected, it will pass through the flow detector 11, and the flow detector 11 will be started to detect it, so that the data can be output to the control assembly 2 for processing and recording.

[0040] Embodiment 2 This second embodiment is based on a device for measuring the oil-water content in oil production logging, and also proposes a method for measuring the oil-water content in oil production logging, including the following steps: The first step is to divert the flow, close the first valve 4, and open the second valve 9 and the third valve 10. At this time, the oil entering the first pipeline 3 will enter the input pipeline 6.

[0041] The second step is the initial mixing. After the oil enters the input pipeline 6, it will enter the interior of the mixing housing 12. The oil will first pass through the initial mixing section and then enter the mixing section. After the mixture of oil and water enters the initial mixing section, as the oil flows, the oil will pass through the spiral groove 23 on the mixing disk 22. After passing through the spiral groove 23, the oil and water will automatically undergo initial mixing under the guidance of the spiral groove 23, thereby improving the accuracy of detection.

[0042] The third step is driving. After the oil enters the mixing section, the first motor 19 is started. The first motor 19 drives the driving column to rotate, the driving shaft 18 drives the active bevel gear 21 to rotate, and the active bevel gear 21 drives the two driven bevel gears 20 to rotate in the opposite direction at the same time, thereby driving the two stirring shafts 14 to rotate in the opposite direction at the same time.

[0043] The fourth step is stirring. The stirring shaft 14 drives the stirring rod 15 to rotate around the axial position of the stirring rod 15, so as to stir the oil entering the mixing shell 12. As the stirring shaft 14 drives the stirring rod 15 to stir the oil, the stirring rod 15 will continuously pass through the through groove 17 at the corresponding position on the mixing frame 16. The length and width of the stirring rod 15 are slightly smaller than the size of the through groove 17. When the stirring rod 15 passes through the through groove 17, a small vortex will appear at the intersection, thereby further improving the uniformity of the oil and water.

[0044] The fifth step is to measure the water content. The oil can enter the water content measuring instrument 5 through the central pipeline 8 to measure the water content of the oil online. The measured results are transmitted to the control assembly 2 in real time for analysis and recording, thereby improving the accuracy of the detection.

[0045] The sixth step is flow measurement. During the process of transporting oil through the first pipeline 3, or when the oil passes through the input pipeline 6 and the output pipeline 7, after the water content is detected, it will pass through the flow detector 11. The flow detector 11 is started to detect it, and the data is output to the control assembly 2 for processing and recording.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring oil-water content in oil production logging, comprising a device housing (1), a control assembly (2) fixedly mounted on the device housing (1), a first pipeline (3) fixedly mounted inside the device housing (1), both ends of the first pipeline (3) being located outside the device housing (1), and characterized in that: Also includes: a first valve (4), wherein the first valve (4) is fixedly mounted on the first pipeline (3); A branch circuit component, wherein the branch circuit component is installed inside the device housing (1); a water content measuring instrument (5), the water content measuring instrument (5) being mounted on the branch assembly, the branch assembly being used to transport petroleum to the water content measuring instrument (5) for detection; The branch circuit assembly comprises: an input pipeline (6), the input pipeline (6) being connected to the first pipeline (3); an output pipeline (7), the output pipeline (7) being connected to the first pipeline (3), and the first valve (4) being located between the input pipeline (6) and the output pipeline (7); A central through pipe (8), the central through pipe (8) being fixedly installed inside the device housing (1); Wherein, the output end of the moisture content measuring instrument (5) is in communication with the output pipeline (7), and the input end of the moisture content measuring instrument (5) is in communication with the central pipeline (8); A mixing assembly, the branch assembly is equipped with the mixing assembly, and is used to mix the petroleum and oilfield water mixed in the petroleum; The mixing assembly comprises: A mixing housing (12), the mixing housing (12) being connected between the input pipeline (6) and the central pipeline (8), the mixing housing (12) comprising a mixing section and a primary mixing section; A mixing unit, which is installed inside the mixing section and is used to mix petroleum and oilfield water; A driving unit, the driving unit is installed inside the mixing unit and is used to drive the mixing unit to move; A premixing section is installed inside the primary mixing section and is used to pre-stir the petroleum and oilfield water before mixing them.

2. The oil-water content measuring device in petroleum production logging according to claim 1 is characterized in that: Also includes: a second valve (9), the second valve (9) being fixedly mounted on the input pipeline (6); A third valve (10), wherein the third valve (10) is fixedly mounted on the output pipeline (7).

3. The oil-water content measuring device in petroleum production logging according to claim 2, further comprising a flow detection device, wherein the flow detection device is installed on the first pipeline (3), characterized in that: The flow detection device comprises a flow detector (11), the flow detector (11) being fixedly mounted on the first pipeline (3), the flow detector (11) being located between an end of the first pipeline (3) and a connection position between the output pipeline (7) and the first pipeline (3).

4. The oil-water content measuring device in petroleum production logging according to claim 3 is characterized in that: The mixing unit comprises: A mounting frame (13), wherein the mounting frame (13) is fixedly mounted inside the mixing housing (12): A stirring shaft (14), wherein two stirring shafts (14) are symmetrically and rotatably mounted on the mounting frame (13), and the two stirring shafts (14) are coaxially arranged with the mixing housing (12); A stirring member, wherein a plurality of groups of the stirring members are fixedly mounted at equal angles in a circular shape on the two stirring shafts (14), each stirring member is provided with a plurality of stirring rods (15), and the plurality of stirring rods (15) of each group of the stirring members are arranged at equal distances along the axis direction of the stirring shaft (14).

5. The oil-water content measuring device in petroleum production logging according to claim 4, characterized in that: Also includes: A mixing rack (16), wherein a plurality of the mixing racks (16) are fixedly mounted at equal angles in a circular shape on both sides of the interior of the mixing housing (12); Through grooves (17), each of the mixing racks (16) is provided with a plurality of through grooves (17) at equal distances, and the through grooves (17) correspond to the stirring rods (15).

6. The oil-water content measuring device in petroleum production logging according to claim 5, characterized in that: The driving unit comprises: A drive shaft (18), wherein the drive shaft (18) is rotatably mounted inside the mounting frame (13); a first motor (19), the first motor (19) being fixedly mounted on the mounting frame (13), the output end of the first motor (19) being fixedly connected to the drive shaft (18); A driven helical gear (20), the ends of the two stirring shafts (14) being fixedly mounted with the driven helical gear (20); A driving bevel gear (21), the driving bevel gear (21) being fixedly mounted on the driving shaft (18), the driving bevel gear (21) being meshed with the two driven bevel gears (20) respectively.

7. The oil-water content measuring device in petroleum production logging according to claim 6, characterized in that: The premixing section comprises: A mixing disk (22), the mixing disk (22) being symmetrically and fixedly mounted inside the primary mixing section; Groove groups, wherein the two mixing disks (22) have multiple groups of groove groups arranged at equal angles in a circular shape inside, and each group of groove groups includes multiple spiral grooves (23) arranged at equal angles in a circular shape; Wherein, the rotation directions of two adjacent groups of spiral grooves (23) are opposite.

8. A method for measuring the oil-water content in oil production logging, using the oil-water content measuring device in oil production logging according to claim 7, characterized in that: The following steps are involved: S1, diverting, closing the first valve (4), opening the second valve (9) and the third valve (10), at which time the oil entering the first pipeline (3) will enter the input pipeline (6); S2, initial mixing. After the oil enters the input pipeline (6), it will enter the interior of the mixing housing (12). The oil will first pass through the initial mixing section and then enter the mixing section. After the mixture of oil and water enters the initial mixing section, as the oil flows, the oil will pass through the spiral groove (23) on the mixing disk (22) to be initially mixed. S3, driving, after the oil enters the mixing section, the first motor (19) drives the driving bevel gear (21) to rotate via the driving shaft (18), and the driving bevel gear (21) drives the two driven bevel gears (20) to rotate in the opposite direction at the same time, thereby driving the two stirring shafts (14) to rotate in the opposite direction at the same time; S4, stirring, the stirring shaft (14) drives the stirring rod (15) to rotate around the axis position of the stirring rod (15), thereby stirring the petroleum entering the mixing housing (12); S5, water content measurement, through the central pipeline (8) to enter the water content measuring instrument (5) to measure the water content of the oil online, the measurement results are transmitted to the control assembly (2) in real time for analysis and recording; S6, flow measurement, during the process of transporting the oil through the first pipeline (3), the oil passes through the flow detector (11), and the flow detector (11) is started to detect the oil, thereby outputting the data to the control assembly (2) for processing and recording.

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