A prying and metering method for oil, gas and water three-phase metering of multi-well crude oil

Abstract

This invention relates to the field of three-phase flow metering technology for oil, gas, and water, specifically to a three-phase flow metering skid and method for multi-well crude oil, comprising a mounting base, an input component, a metering component, a data processing terminal, and an output component mounted on the mounting base. The input component's input port can be selectively connected to a single crude oil wellhead. The input component includes a mixer capable of mixing the crude oil to obtain a homogenized three-phase mixture. The metering component can scan cross-sectional images of the mixture and acquire the flow velocity of the mixture, displaying both the cross-sectional image and the flow velocity. By installing a mixer on the input component, three-phase homogenization of oil, gas, and water is achieved. Combined with the tomographic scanning cross-sectional imaging technology of the metering component, accurate acquisition of the three-phase ratio and flow rate data is obtained. Furthermore, the input port of the input component can be selectively connected to a single crude oil wellhead, and the data processing terminal, in conjunction with a valve position feedback module, enables automatic rotational metering across multiple oil wells.

Description

Technical Field

[0001] This invention relates to the field of three-phase flow metering technology for oil, gas and water, and particularly to a three-phase flow metering skid and metering method for crude oil from multiple wells. Background Technology

[0002] In the process of oilfield development and production, the measurement of single-well oil, gas and water production is the core basis for understanding oil well productivity, optimizing production parameters, calculating oil and gas reserves, and formulating development plans. Traditional oilfield metering often adopts a separate metering method, that is, after separating the three phases of oil, gas and water through a large separator on a metering skid, the oil, gas and water are measured separately using equipment such as flow meters, valve position feedback modules, and water cut analyzers, and then the results are aggregated to obtain the single-well production.

[0003] Currently, oilfield metering devices generally use metering skids. Existing metering skids typically include a mounting base, a three-phase separator mounted on the base, and gas, liquid, and oil pipelines separated from the three-phase separator. Parameters such as flow rate and level of gas, water, and oil on these three pipelines are measured to determine the crude oil production within a single well. Furthermore, a frame structure is installed on the base, housing the three-phase separator and other components. However, current metering skids have several problems: the pursuit of higher separation efficiency results in a large three-phase separator, and the numerous pipelines on the separate metering skid also contribute to its bulky size, large footprint, and low integration. Consequently, for wells with high wellhead density, such as slave wells or multi-well groups, there is insufficient space to accommodate the metering skid, leading to high costs for equipment installation, relocation, and maintenance.

[0004] In addition, in the existing multi-well crude oil metering skid, each wellhead is connected to the crude oil inlet main pipe on the three-phase separator through a crude oil inlet branch pipe. Each crude oil inlet branch pipe can be selectively connected to the crude oil inlet main pipe on the three-phase separator of the metering skid through a control valve to realize the alternating metering of different wellheads. In other words, when metering crude oil from multiple wells, it is necessary to manually control the opening and closing of different valves, resulting in a low rotation rate and low efficiency of crude oil metering from multiple wells.

[0005] Furthermore, during the separation process of crude oil through a three-phase separator, since the separation is based on density, it is inevitable that some gas or water will flow into the oil phase to form a mixed flow. In particular, mixed flows with high gas content, high water content, and complex flow patterns are easily affected by flow pattern distortion and uneven phase distribution, resulting in poor metering accuracy and large errors in water content and gas content measurement. In other words, it cannot accurately reflect the true production capacity of a single well. Summary of the Invention

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a three-phase metering skid for oil, gas and water in multi-well crude oil and a metering method, which solves the technical problems of traditional metering skid equipment being large in size, having low crude oil metering efficiency in multiple wells, and being unable to accurately reflect the true production capacity of a single well.

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include: On one hand, embodiments of the present invention provide a three-phase metering skid for oil, gas and water in multi-well crude oil, including a mounting base, an input component, a metering component, a data processing terminal and an output component disposed on the mounting base; The input component has an input port and an output port. The data acquisition end of the metering component is fitted outside the input component. The data output end of the metering component is connected to the data processing terminal. The input port of the input component can be selectively connected to a crude oil wellhead. The input component includes a mixer disposed between the input port and the output port. The mixer is capable of mixing crude oil to obtain a three-phase homogenized mixture. The metering component can scan the cross-sectional image of the mixture and collect the flow rate of the mixture, and feed the cross-sectional image and the flow rate as metering information back to the data processing terminal. The data processing terminal can receive and analyze the metering information. The output component is used to deliver the mixture into a crude oil storage tank.

[0008] Optionally, the input component further includes a multi-way valve, the multi-way valve including a valve body and a plurality of inlet pipes connected to the valve body; The valve body has multiple liquid inlets and one liquid outlet. The liquid inlets are spaced apart around the circumference of the valve body and the liquid inlet pipe is connected to the liquid inlet. A valve position feedback module is provided at the liquid inlet and the valve position feedback module is electrically connected to the data processing terminal. The outlet is connected to an oil supply pipe, and the mixer is disposed on the oil supply pipe to divide the oil supply pipe into a first part connected to the outlet and a second part connected to the output component.

[0009] Optionally, the mixer includes a mixing housing, within which a swirling disturbance core, multiple shear baffles, and multiple guide vanes are disposed; The swirling disturbance core, multiple shear baffles, and multiple guide vanes are sequentially fixedly installed inside the mixing shell. The swirling disturbance core is located on the side close to the output component, and the multiple guide vanes are spirally distributed along the circumference of the swirling disturbance core. Multiple holes are provided on the shear baffles.

[0010] Optionally, the mixing shell is a stainless steel pressure-resistant cylinder, the helix angle of the guide vanes is set to 30°-50°, the aperture of the holes on the shear baffle is 2mm-5mm, and the pressure resistance rating of the mixing shell is 14MPa-18MPa.

[0011] Optionally, the metering component includes a flow rate detector and a tomographic imaging body; The flow velocity detector and the tomographic imaging body are respectively mounted on the outer wall of the second part of the oil pipeline. The flow velocity detector is equipped with a flow velocity detection module and a flow velocity signal transmission module. The flow velocity detection module is used to collect the flow velocity of the mixture and send it to the flow velocity signal transmission module. The flow velocity signal transmission module sends the flow velocity signal to the output component. The tomographic imaging body includes a tomographic imaging module and an image signal transmission module. The tomographic imaging module is used to scan the cross-sectional image of the mixture and send it to the image signal transmission module. The image signal transmission module sends the cross-sectional image signal to the output component.

[0012] Optionally, the tomographic imaging subject employs X-ray tomography.

[0013] Optionally, the flow rate detector employs ultrasonic detection.

[0014] Optionally, the output component includes a terminal housing, and an image analysis module, a flow calculation module, a phase content rate analysis module, and a production calculation module disposed within the terminal housing; The image parsing module is electrically connected to the image signal transmission module; The flow calculation module is electrically connected to the flow velocity signal transmission module; The phase content analysis module is electrically connected to the image signal transmission module and the flow rate signal transmission module, and the production calculation module is electrically connected to the image signal transmission module and the flow rate signal transmission module.

[0015] Optionally, the bottom end face of the mounting base is provided with a lifting lug and a pad hinged to the lifting lug.

[0016] On the other hand, a method for metering the three phases of oil, gas, and water in multi-well crude oil, the assembly method being based on the aforementioned three-phase metering skid for multi-well crude oil, the metering method comprising the following steps: The metering method is based on a three-phase metering skid for oil, gas and water in multi-well crude oil, and the metering method includes the following steps: S1. On-site installation: The three-phase metering skid for oil, gas and water is hoisted to the designated location of the multi-well group in the oilfield. The input ports of the input components are connected to the inlet pipes of each oil wellhead, and the power supply and data transmission lines are connected. S2. Parameter setting: Input the basic parameters of each oil well number, metering duration, and pipeline diameter through the data processing terminal, and debug the tomographic imaging body of the input component to ensure normal equipment operation; S3. Metering Operation: The metering program is started, and the data processing terminal controls the input component to open the first oil well. The crude oil produced from the first oil well enters the mixer of the input component for homogenization to obtain a mixture. The mixture flows into the fault scanning imaging body. The fault scanning imaging module and the flow velocity detection module of the fault scanning imaging body synchronously collect data. The data processing terminal analyzes and calculates in real time. After the metering time reaches the target, the well oil, gas and water production data are automatically generated. S4. Multi-well rotation: After the first well is metered, the inlet corresponding to the first well of the input component is automatically closed and switched to the next oil well. Repeat S3 to complete the metering of all oil wells in sequence. The mixture after metering is then fed into the output component.

[0017] The beneficial effects of this invention are as follows: This invention provides a three-phase metering skid and method for multi-well crude oil, which achieves homogenization of the three phases (oil, gas, and water) by setting a mixer on the input component. This completely solves the problems of uneven flow patterns and discrete phase distribution in traditional metering. Combined with the tomographic scanning cross-sectional imaging technology of the metering component, it accurately acquires the three-phase proportion and flow rate data, resulting in a metering error far lower than traditional separate metering. The accuracy of water cut and gas cut detection is significantly improved. Furthermore, the input port of the input component can be selectively connected to a single crude oil wellhead. The data processing terminal, in conjunction with the valve position feedback module, enables automatic rotation metering of multiple oil wells. The process is simple, the metering speed is fast, and no manual operation is required, significantly improving the efficiency of multi-well metering in oil fields and reducing manual maintenance costs.

[0018] In addition, all equipment is installed on the mounting base, with high integration and strong adaptability: the overall skid-mounted structure is compact and occupies little space, eliminating the need to build large separation equipment, and is suitable for space-constrained scenarios such as oilfield cluster wells, multi-well groups, and offshore platforms. It is convenient for hoisting and transportation, and has high efficiency for on-site installation and commissioning. Attached Figure Description

[0019] Figure 1 This is a top view schematic diagram of the three-phase metering skid for oil, gas and water in multi-well crude oil according to the present invention. Figure 2 for Figure 1 A schematic diagram of the flow velocity detector; Figure 3 This is a schematic diagram of the three-dimensional structure of the tomographic imaging subject of the present invention; Figure 4 This is a schematic diagram of the internal structure of the mixer in Embodiment 1 of the present invention; Figure 5This is a schematic diagram of the internal structure of the mixer in Embodiment 2 of the present invention.

[0020] Explanation of reference numerals in the attached figures 1. Mounting base; 2. Input component; 21. Mixer; 211. Mixing housing; 212. Swirl disturbance core; 213. Shear baffle; 214. Guide vane; 215. Helical cross unit structure; 22. Multi-port valve; 221. Valve body; 222. Inlet pipe; 23. Oil delivery pipe; 231. First part; 232. Second part; 3. Metering component; 31. Flow rate detector; 311. Ultrasonic transmitter; 312. Ultrasonic receiver; 32. Tomography imaging body; 321. X-ray source; 322. X-ray receiver; 4. Data processing terminal; 5. Output component. Detailed Implementation

[0021] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 See Figures 1-4 As shown in the figure, an oil, gas and water three-phase metering skid for multi-well crude oil proposed in this embodiment of the invention includes a mounting base 1, an input component 2, a metering component 3, a data processing terminal 4 and an output component 5 disposed on the mounting base 1.

[0023] The input component 2 has an input port and an output port. The data acquisition end of the metering component 3 is fitted outside the input component 2. The data output end of the metering component 3 is connected to the data processing terminal 4. The input port of the input component 2 can be selectively connected to a crude oil wellhead. The input component 2 includes a mixer 21 disposed between the input port and the output port. The mixer 21 can mix crude oil to obtain a three-phase homogenized mixture. The metering component 3 can scan the cross-sectional image of the mixture and collect the flow rate of the mixture, and feed the cross-sectional image and the flow rate as metering information back to the data processing terminal 4. The data processing terminal 4 can receive and analyze the metering information.

[0024] The output component 5 is used to transport the mixture into the crude oil storage tank.

[0025] Furthermore, the input component 2 also includes a multi-way valve 22, which includes a valve body 221 and a plurality of inlet pipes 222 connected to the valve body 221.

[0026] The valve body 221 has multiple liquid inlets and one liquid outlet. The liquid inlets are spaced apart circumferentially along the valve body 221 and the liquid inlet pipe 222 is connected to the liquid inlet. The liquid inlet has a valve position feedback module, which is electrically connected to the data processing terminal 4.

[0027] The outlet is connected to an oil pipeline 23. The mixer 21 is installed on the oil pipeline 23 to divide the oil pipeline 23 into a first part 231 connected to the outlet and a second part 232 connected to the output component 5. The multi-way valve 22 adopts an electric explosion-proof ball valve combination structure and is equipped with a valve position feedback module. It can receive commands from the data processing terminal 4 to realize automatic switching and on / off control of oil pipelines from multiple oil wells. It also has a manual switching backup function, adapts to the explosion-proof safety requirements of oilfields, has a fast single-well switching response, avoids crosstalk between media from multiple wells, and ensures the uniqueness of metering data.

[0028] Furthermore, the mixer 21 includes a mixing shell 211, and the mixing shell 211 is provided with a swirling disturbance core 212, a plurality of shear baffles 213 and a plurality of guide vanes 214; The swirling disturbance core 212, multiple shear baffles 213 and multiple guide vanes 214 are sequentially fixedly installed inside the mixing shell 211. The swirling disturbance core 212 is located on the side close to the output component 5, and the multiple guide vanes 214 are spirally distributed along the circumference of the swirling disturbance core 212. Multiple holes are provided on the shear baffles 213.

[0029] It should be noted that the high-efficiency mixer 21 is a static multi-stage shear homogenizing mixing structure, internally equipped with spiral guide vanes 214, porous shear baffles 213, and swirling disturbance cores 212. After the extracted oil-gas-water three-phase mixture enters the high-efficiency mixer 21 through the multi-way valve 22, it achieves initial swirling mixing through spiral guidance, breaks up bubbles and droplets through the porous shear baffles 213, refines the particle size of gas phase bubbles and liquid phase oil and water droplets, and then enhances turbulent disturbance through the swirling disturbance cores 212, completely eliminating phase separation, stratification, and flow deviation of the oil-gas-water three phases, so that the mixed flow forms a uniform and stable homogeneous flow, ensuring the accuracy and representativeness of subsequent fault scanning detection data. The high-efficiency mixer 21 has no external power components, is driven by the pressure of the medium in the pipeline, has low energy consumption and no vulnerable parts, and is suitable for long-term continuous operation in oil fields.

[0030] Furthermore, the mixing shell 211 is a stainless steel pressure-resistant cylinder, the helix angle of the guide vane 214 is set to 30°-50°, the aperture of the hole on the shear baffle 213 is 2mm-5mm, and the pressure resistance rating of the mixing shell 211 is 14MPa-18MPa. Specifically, the high-efficiency mixer 21 adopts a static multi-stage homogeneous structure. The main body is a stainless steel pressure-resistant cylinder. Inside, three-stage spiral guide vanes 214, two sets of porous shear baffles 213, and a swirling disturbance core 212 are arranged sequentially. The spiral angle of the guide vanes 214 is set to 45°, the aperture of the porous shear baffles 213 is 3mm, and the swirling disturbance core 212 is a cross-shaped swirling structure. The mixer 21 has a pressure rating of 16MPa, which is suitable for the conventional produced fluid pressure of oil fields. When the oil-gas-water mixture flows through the high-efficiency mixer 21, it undergoes three steps of treatment: guiding swirling, shearing and crushing, and disturbance and mixing. The gas phase bubble particle size is refined to less than 0.5mm, and the liquid phase water droplets and oil droplets are evenly dispersed to form a homogeneous mixed flow.

[0031] Among them, the data processing terminal 4 adopts an explosion-proof industrial control computer, which has four core modules built-in: image analysis, flow calculation, phase content analysis, and production calculation. The image analysis module accurately segments the cross-sectional area of ​​oil, gas and water using deep learning algorithms. The flow calculation module calculates the volumetric flow rate based on the formula of flow velocity and pipe diameter. The phase content analysis module converts the three-phase volume percentage by pixel ratio. The production calculation module calculates the production based on the metering time of a single well. The data storage period is ≥1 year, and it supports remote data transmission and report printing.

[0032] Furthermore, the metering component 3 includes a flow rate detector 31 and a tomographic imaging body 32.

[0033] The flow velocity detector 31 and the tomographic imaging body 32 are respectively mounted on the outer wall of the second part 232 of the oil pipeline 23. The flow velocity detector 31 is equipped with a flow velocity detection module and a flow velocity signal transmission module. The flow velocity detection module is used to collect the flow velocity of the mixture and send it to the flow velocity signal transmission module. The flow velocity signal transmission module sends the flow velocity signal to the output component 5.

[0034] The tomographic imaging body 32 includes a tomographic imaging module and an image signal transmission module. The tomographic imaging module scans the cross-sectional image of the mixture and sends it to the image signal transmission module, which then sends the cross-sectional image signal to the output component 5. The second part 232 of the oil pipeline 23 is a smooth straight pipe of equal diameter, with both ends connected to the output end of the high-efficiency mixer 21 and the confluence output pipeline, ensuring stable flow of the homogeneous mixed flow. The tomographic imaging module is arranged around the outer wall of the second part 232 of the oil pipeline 23, using non-invasive tomographic scanning technology to acquire cross-sectional tomographic images of the homogeneous mixed flow in the pipeline in real time, clearly capturing the distribution characteristics and phase interface information of the oil, gas, and water phases in the pipeline cross-section. The flow velocity detection module is built into the second part 232 of the oil pipeline 23, synchronously detecting the real-time flow velocity data of the homogeneous mixed flow and matching and linking it with the cross-sectional image data. The signal transmission module transmits the cross-sectional image data and flow velocity data to the data processing terminal 4 in real time.

[0035] Furthermore, the tomographic imaging body 32 employs X-ray tomography. The tomographic imaging module utilizes X-ray tomography technology, which is a non-invasive detection method that does not interfere with the flow field, avoids media contact contamination, and ensures detection accuracy unaffected by media temperature, pressure, or viscosity, making it suitable for detecting oil-gas-water mixed flows under different oilfield operating conditions. The inner wall of the second part 232 of the oil pipeline 23 is equipped with an anti-scaling and anti-corrosion coating, extending the service life of the device.

[0036] Furthermore, the flow rate detector 31 employs ultrasonic detection.

[0037] The metering component 3 includes the second part 232 of the equal-diameter oil pipeline 23, an X-ray tomography imaging module, an ultrasonic flow velocity detection module, and a signal transmission module. The diameter of the second part 232 of the oil pipeline 23 matches that of the oil production pipeline, and the inner wall is coated with a polytetrafluoroethylene anti-scaling coating. The X-ray tomography imaging module uses dual-energy X-ray (such as a molybdenum target 20–50 keV, or a tungsten target ~60 keV) transmission + detector array symmetrically arranged around the outer wall of the straight pipe section. It is equipped with two sets of scanning probes to non-invasively acquire cross-sectional tomographic images in real time, and simultaneously calculate water cut and gas cut, eliminating interference from flow pattern and dielectric properties. The ultrasonic flow velocity detection module is non-invasively installed, with two sets of flow velocity sensing units embedded along the pipe wall, evenly distributed around the cross-section, synchronously acquiring multi-point flow velocity data. After weighted fitting, the true average flow velocity of the cross-section is obtained. The flow velocity detection range is 0.1-10 m / s, the detection accuracy is ±0.25%, and the detection sequence is strictly synchronized with the tomography module, with the time difference controlled within 1 ms.

[0038] The flow velocity detector 31 is an ultrasonic flow velocity detection module, which includes an ultrasonic transmitter 311 and an ultrasonic receiver 312. The tomographic imaging body 32 is an X-ray tomographic imaging module, which includes an X-ray source 321 and an X-ray receiver 322.

[0039] Furthermore, the output component 5 includes a terminal housing, and an image analysis module, a flow calculation module, a phase content analysis module, and a production calculation module disposed within the terminal housing.

[0040] The image parsing module is electrically connected to the image signal transmission module.

[0041] The flow calculation module is electrically connected to the flow rate signal transmission module.

[0042] The phase content analysis module is electrically connected to the image signal transmission module and the flow velocity signal transmission module, and the production calculation module is also electrically connected to the image signal transmission module and the flow velocity signal transmission module. The data processing terminal 4 has a built-in image analysis module, flow calculation module, phase content analysis module, and production calculation module. The image analysis module performs noise reduction, enhancement, and segmentation processing on the fault scan cross-sectional image to accurately identify the distribution area and proportion of the oil, gas, and water phases within the cross-section. The flow calculation module combines flow velocity detection data with the pipe diameter parameters of the second part 232 of the oil pipeline 23 to calculate the real-time volumetric flow rate of the homogeneous mixed flow. The phase content analysis module analyzes the volume percentage of oil, gas, and water phases in the mixed flow based on the three-phase proportion data of the cross-sectional image. The production calculation module accurately calculates the single-phase production of oil, gas, and water in a single well based on the single-well metering time, volumetric flow rate, and three-phase percentage data, and generates metering reports, stores historical data, and supports the classification, collection, and comparative analysis of multi-well metering data.

[0043] Furthermore, the bottom end face of the mounting base 1 is provided with a lifting lug and a pad hinged to the lifting lug. The skid-mounted base adopts a reinforced structure of welded steel sections, and is provided with a lifting lug and fixed support at the bottom. The overall structure meets the requirements for field lifting, transportation, and fixed installation in oilfields. High-pressure sealing joints are used at all pipeline connections to adapt to the high-pressure operating conditions of oilfield produced fluids, ensuring reliable sealing performance.

[0044] In this embodiment, the effective effect is as follows: 1. High metering accuracy: The high-efficiency mixer 21 achieves homogenization of oil, gas and water phases, completely solving the problems of uneven flow patterns and discrete phase distribution in traditional metering. Combined with tomographic cross-sectional imaging technology, it accurately obtains the three-phase ratio and flow data. The metering error is much lower than that of traditional separate metering, and the detection accuracy of water content and gas content is greatly improved.

[0045] 2. High integration and strong adaptability: The overall skid-mounted structure is compact and occupies little space. There is no need to build large separation equipment. It is suitable for space-constrained scenarios such as oilfield cluster wells, multi-well groups, and offshore platforms. It is convenient for hoisting and transportation and has high efficiency for on-site installation and commissioning.

[0046] 3. High-efficiency metering for multiple wells: Equipped with a multi-way valve 22, it enables automatic rotation metering of multiple oil wells. The process is simple, the metering speed is fast, and no manual operation is required, which greatly improves the metering efficiency of multiple wells in the oil field and reduces the cost of manual operation and maintenance.

[0047] 4. Stable and reliable operation: The high-efficiency mixer 21 has no powered parts and a low failure rate; the tomographic scanning unit performs non-invasive detection without wear or media contamination, making it suitable for complex working conditions such as high pressure, high temperature, and high viscosity in oil fields; and the data processing terminal 4 realizes automatic data parsing, storage, and output, with a high degree of intelligence.

[0048] 5. Excellent economic performance: It abandons traditional large-scale separation equipment, reduces equipment purchase, infrastructure and operation and maintenance costs, has low energy consumption and long service life, effectively reduces the overall cost of oilfield metering, and is suitable for large-scale promotion and application.

[0049] Furthermore, a method for metering the three phases of oil, gas, and water in multi-well crude oil, the method being based on a three-phase metering skid for multi-well crude oil, the method comprising the following steps: S1. On-site installation: The three-phase metering skid for oil, gas and water is hoisted to the designated location of the multi-well group in the oilfield. The input port of the input component 2 is connected to the inlet pipe 222 of each oil wellhead, and the power supply and data transmission line are connected.

[0050] S2. Parameter setting: Input basic parameters such as well number, metering duration, and pipeline diameter of each oil well through the data processing terminal 4, and debug the tomographic imaging body 32 of the input component 2 to ensure normal equipment operation.

[0051] S3. Metering Operation: The metering program is initiated. The data processing terminal 4 controls the input component 2 to open the first oil well. The crude oil produced from the first oil well enters the mixer 21 of the input component 2 for homogenization to obtain a mixture. The mixture flows into the tomographic imaging body 32. The tomographic imaging module and flow velocity detection module of the tomographic imaging body 32 synchronously collect data. The data processing terminal 4 analyzes and calculates the data in real time. After the metering time reaches the target, the well oil, gas and water production data are automatically generated.

[0052] S4. Multi-well rotation: After the first well is metered, the inlet corresponding to the first well of the input component 2 is automatically closed and switched to the next oil well. Repeat S3 to complete the metering of all oil wells in sequence. The mixture after metering is fed into the output component 5.

[0053] First, the metering well number is set through the data processing terminal 4, and the multi-way valve 22 is controlled to open the corresponding oil well's oil outlet pipeline (liquid inlet pipe 222). The oil, gas and water three-phase mixture produced by the well enters the high-efficiency mixer 21 under the pressure of the pipeline. The mixture is processed by multi-stage shearing and swirling disturbance inside the high-efficiency mixer 21, and the gas phase bubbles, liquid phase oil droplets and water droplets are fully refined. The three-phase medium is uniformly mixed to form a stable homogeneous flow, eliminating the interference of flow pattern distortion and phase stratification on the metering.

[0054] The homogeneous mixed flow smoothly flows into the second part 232 of the oil pipeline 23 of the fault scanning imaging body 32. The flow velocity detection module collects the mixed flow velocity data in real time, and the fault scanning imaging module simultaneously acquires the cross-sectional tomographic image of the pipeline. Both types of data are uploaded to the data processing terminal 4 in real time through the signal transmission module. The data processing terminal 4 extracts the proportion of oil, gas and water phases in the cross-section through the image analysis module, calculates the volumetric flow rate of the mixed flow by combining the flow velocity and the pipe diameter through the flow rate calculation module, accurately calculates the volume percentage of the three phases through the phase content analysis module, and calculates the single-phase production of oil, gas and water in a single well by combining the metering time through the production calculation module. After the single-well metering is completed, the data processing terminal 4 controls the multi-way valve 22 to switch to the next oil production well and repeats the above process to achieve accurate metering of multiple wells. The metered mixed liquid is then fed into the oilfield gathering and transportation trunk line (output component 5) through the manifold output pipeline. A skid for three-phase metering of oil, gas, and water in multiple wells of an oilfield includes a mounting base 1, a multi-way valve 22, a high-efficiency mixer 21, a tomographic imaging main body 32, a data processing terminal 4, and a manifold output pipeline (output component 5). The multi-way valve 22, the high-efficiency mixer 21, the tomographic imaging main body 32, the data processing terminal 4, and the manifold output pipeline (output component 5) are sequentially connected via an oil pipeline 23 and are all fixedly installed on the mounting base 1, achieving overall skid-mounted integration, which facilitates on-site hoisting, relocation, and installation. The input end of the multi-way valve 22 is connected to the oil production pipeline of multiple oil wells in the oilfield, realizing flexible switching between single-well and multi-well alternating metering, and the output end is connected to the feed inlet of the high-efficiency mixer 21. The data processing terminal 4 is electrically connected to the multi-way valve 22 and the tomographic imaging main body 32 respectively, realizing valve group switching control, data acquisition and analysis, and metering result output.

[0055] Example 2 See Figure 5As shown, unlike Example 1, the mixing shell 211 employs a 5-stage series spiral cross unit structure 215, which combines shearing, diversion, and swirling functions to ensure thorough mixing of the three phases. Specifically, it adopts a Kenics-type spiral cross unit design, composed of multiple 180° twisted spiral blades connected in series. Adjacent blades are installed in opposite directions and cross at 90°, forming a continuous diversion-swirling-convergence mixing chamber. The advantages of this embodiment are: completely no moving parts, purely static structure; integrated welding of the helical blades to the inner wall of the pipe; five-stage mixing units connected in series, progressively enhancing the mixing effect; modular design, allowing for the addition or reduction of units as needed; diversion effect: each blade section divides the pipe cross-section into 2-4 channels, continuously cutting the fluid; swirling effect: the helical twisting causes the fluid to generate radial swirling flow, generating centrifugal force to replace the light and heavy phases; cross-action effect: adjacent blades are installed at 90° intersections, reversing the swirling direction and generating a strong shear interface; turbulence effect: the local turbulence intensity reaches 5-8 times that of the pipe turbulence, enhancing interphase mass transfer. Special optimizations for oil-gas-water three-phase mixing: First inlet rectifying section: a 2D length straight pipe section is set as rectifying; avoiding the influence of inlet swirling flow on the mixing effect; Second blade profile optimization: using a constant pitch helix with a chamfer at the inlet; the blade edge is rounded by R=0.5mm to reduce wax buildup; Third anti-clogging design: the minimum flow channel area is ≥70% of the pipe cross-sectional area; no dead zones or sharp angles, reducing sand deposition; the blades are fully welded to the pipe wall to avoid gap corrosion.

[0056] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A three-phase metering skid for oil, gas, and water in multi-well crude oil systems, characterized in that: It includes a mounting base (1), an input component (2) disposed on the mounting base (1), a metering component (3), a data processing terminal (4) and an output component (5); The input component (2) has an input port and an output port. The data acquisition end of the metering component (3) is fitted outside the input component (2). The data output end of the metering component (3) is connected to the data processing terminal (4). The input port of the input component (2) can be selectively connected to a crude oil wellhead. The input component (2) includes a mixer (21) disposed between the input port and the output port. The mixer (21) can mix crude oil to obtain a three-phase homogenized mixture. The metering component (3) can scan the cross-sectional image of the mixture and collect the flow rate of the mixture, and feed the cross-sectional image and the flow rate as metering information back to the data processing terminal (4). The data processing terminal (4) can receive the metering information and parse it. The output component (5) is used to deliver the mixture into the crude oil storage tank.

2. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 1, characterized in that: The input component (2) further includes a multi-way valve (22), which includes a valve body (221) and a plurality of inlet pipes (222) connected to the valve body (221). The valve body (221) has multiple inlets and one outlet. The inlets are spaced apart around the circumference of the valve body (221) and the inlet pipe (222) is connected to the inlet. The inlet has a valve position feedback module, which is electrically connected to the data processing terminal (4). The outlet is connected to an oil pipe (23), and the mixer (21) is disposed on the oil pipe (23) to divide the oil pipe (23) into a first part (231) connected to the outlet and a second part (232) connected to the output component (5).

3. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 2, characterized in that: The mixer (21) includes a mixing shell (211), and the mixing shell (211) is provided with a plurality of swirling disturbance cores (212), a plurality of shear baffles (213) and a plurality of guide vanes (214). The plurality of guide vanes (214), the plurality of shear baffles (213) and the plurality of swirling disturbance cores (212) are sequentially fixedly installed inside the mixing shell (211). The swirling disturbance cores (212) are located on the side close to the output component (5), and the plurality of guide vanes (214) are spirally distributed along the circumference of the swirling disturbance cores (212). The shear baffles (213) have a plurality of holes.

4. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 3, characterized in that: The mixing shell (211) is a stainless steel pressure-resistant cylinder, the helix angle of the guide vane (214) is set to 30°-50°; the aperture of the hole on the shear baffle (213) is 2mm-5mm, and the pressure resistance rating of the mixing shell (211) is 14MPa-18MPa.

5. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 4, characterized in that: The metering component (3) includes a flow rate detector (31) and a tomographic imaging body (32). The flow velocity detector (31) and the tomographic imaging body (32) are respectively mounted on the outer wall of the second part (232) of the oil pipeline (23). The flow velocity detector (31) is equipped with a flow velocity detection module and a flow velocity signal transmission module. The flow velocity detection module is used to collect the flow velocity of the mixture and send it to the flow velocity signal transmission module. The flow velocity signal transmission module sends the flow velocity signal to the output component (5). The tomographic imaging body (32) includes a tomographic imaging module and an image signal transmission module. The tomographic imaging module is used to scan the cross-sectional image of the mixture and send it to the image signal transmission module. The image signal transmission module sends the cross-sectional image signal to the output component (5).

6. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 5, characterized in that: The tomographic imaging subject (32) is subjected to X-ray tomography.

7. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 6, characterized in that: The flow rate detector (31) uses ultrasonic detection.

8. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 5, characterized in that: The output component (5) includes a terminal housing, and an image analysis module, a flow calculation module, a phase content rate analysis module, and a production calculation module disposed within the terminal housing; The image parsing module is electrically connected to the image signal transmission module; The flow calculation module is electrically connected to the flow velocity signal transmission module; The phase content analysis module is electrically connected to the image signal transmission module and the flow rate signal transmission module, and the production calculation module is electrically connected to the image signal transmission module and the flow rate signal transmission module.

9. The three-phase metering skid for oil, gas, and water in multi-well crude oil as described in claim 1, characterized in that: The bottom end face of the mounting base (1) is provided with a lifting lug and a pad hinged to the lifting lug.

10. A method for metering the three phases of oil, gas, and water in multi-well crude oil, characterized in that: The metering method is based on the three-phase oil-gas-water metering skid for multi-well crude oil as described in any one of claims 1-9, and the metering method includes the following steps: S1. On-site installation: The three-phase metering skid for oil, gas and water is hoisted to the designated location of the multi-well group in the oilfield. The input port of the input component (2) is connected to the liquid inlet pipe (222) connected to each wellhead. The power supply and data transmission line are connected. S2, Parameter setting: Input the basic parameters of well number, metering duration and pipeline diameter of each oil well through the data processing terminal (4), and debug the tomographic imaging body (32) of the input component (2) to ensure that the equipment is operating normally; S3. Metering operation: Start the metering program, the data processing terminal (4) controls the input component (2) to open the first oil well, the crude oil produced from the first oil well enters the mixer (21) of the input component (2) for homogenization to obtain a mixture, the mixture flows into the fault scanning imaging body (32); the fault scanning imaging module and the flow velocity detection module of the fault scanning imaging body (32) collect data synchronously, the data processing terminal (4) analyzes and calculates in real time, and automatically generates well oil, gas and water production data after the metering time reaches the target; S4, Multi-well rotation: After the first well is metered, the inlet of the first well of the input component (2) is automatically closed and switched to the next oil well. Repeat S3 to complete the metering of all oil wells in sequence. After metering, the mixture is fed into the output component (5).

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