A Measuring Method of Oil Phase Flow Velocity Based on Orb and Ransac
A technology of flow velocity measurement and measurement method, which is applied in the direction of fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., which can solve the problems of blurred images, affecting the accuracy of flow velocity measurement, and uneven brightness.
Active Publication Date: 2020-11-17
龙沃科技开发有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem that the measurement accuracy of flow velocity is affected by image blur and brightness unevenness due to the image particle matching in the process of measuring the flow velocity of the oil-water two-phase flow with low flow velocity and high water content, and to provide a method based on improved ORB and RANSAC Algorithm-Based Oil-Water Two-Phase Flow Measuring Method for Oil-Phase Velocity
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Embodiment 1
[0073] Such as Figure 1-5 Shown, a kind of oil phase flow rate measurement method based on ORB and RANSAC is characterized in that: described measurement method comprises the following steps:
[0074] Step 1: Process the data information of the image according to the FAST algorithm, and detect the feature points in the image;
[0075] The calculation method of the FAST algorithm is:
[0076] To judge whether a certain pixel point O(i,j) is a feature point, compare the pixel value corresponding to the surrounding pixel point with point O as the center and the radius of 3 with the pixel value at point O, if more than 12 If the absolute value of the difference between the pixel value corresponding to the pixel point and the pixel value of point O is greater than the set threshold, it is determined that point O is a feature point, otherwise point O is not a feature point;
[0077] The expression for judging whether a point O(i, j) is a feature point is
[0078]
[0079] In ...
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The invention belongs to the technical field of oilfield production, and specifically relates to a method for measuring oil phase flow velocity based on ORB and RANSAC. 1. Process image data information according to the FAST algorithm to detect feature points in the image; 2. Determine the direction θ of the feature points, Describe the feature points detected in step 2 according to the improved BRIEF algorithm, so that the descriptor is stable; 3. Match the feature points in the collected multi-frame images according to the Hamming distance, and initially extract the matching point pairs; 4. Use the improved The RANSAC algorithm screens the initially extracted matching point pairs, and extracts the final matching point pairs. 5. Calculate the average velocity of all characteristic particles according to the position information of the finally extracted matching point pairs and the time difference t collected between images, which is the oil phase The average speed of movement can realize the rapid measurement of the oil phase flow rate of low flow rate and high water content oil-water two-phase flow, which can improve the work accuracy.
Description
Technical field: [0001] The invention belongs to the technical field of oil field production, and in particular relates to an oil phase flow velocity measurement method based on ORB and RANSAC. Background technique: [0002] In oil field production and chemical industry, oil-water two-phase flow is the most common two-phase flow. At present, the main characteristics of oil-water two-phase flow are low flow velocity, high water content, and relatively complex flow patterns, which make its flow characteristics different from those of fluids under other conditions, and increase the difficulty of measuring flow parameters such as flow velocity. It is very important to estimate the total amount of liquid oil produced in the oilfield and to accurately measure the safe operation of oilfield equipment and flow parameters. Particle Tracking Technology (PTV) is a common multiphase flow velocity measurement technology, the key of which is to track the trajectory of a single particle, ...
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IPC IPC(8): G01P5/00G06K9/62G06K9/46
CPCG01P5/00G06V10/44G06V10/757
Inventor 韩连福王海霞付长凤刘兴斌谢荣华刘超
Owner 龙沃科技开发有限公司