Laboratory calibration method for reducing flow velocity of recovery force nozzle of gravity anchor

By preparing three-axis test samples and calculating the confining and axial pressure, and using a triaxis instrument to perform multi-pressure differential test and fluid viscosity correction, the problem of inaccurate measurement results in the gravity anchor recovery nozzle flow rate calibration method is solved, and accurate data conversion from laboratory to actual working conditions is achieved, and nozzle design and construction are optimized.

CN120489768APending Publication Date: 2025-08-15OFFSHORE OIL ENG CO LTD
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Patent Information

Application Number
CN202510366319.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-26
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

In the prior art, the laboratory calibration method for the gravity anchor recovery nozzle flow rate is inaccurate due to the accuracy limitation of the experimental equipment or the operation error, and the fluid viscosity and nozzle geometry have a significant impact on the flow rate. In actual operation, it is difficult to accurately determine the parameters and make effective corrections, resulting in uncertainty and error in data conversion.

Method used

The on-site soil is obtained through a thin-wall soil extractor, a triaxial test sample is prepared, and the confining and axial pressure are calculated. The initial back pressure is applied by a triaxial instrument for multi-pressure differential test and fluid viscosity correction. The flow rate is optimized in combination with the fluid viscosity, and finally the actual working conditions flow rate is converted according to the test results.

Benefits of technology

It improves the accuracy and application value of experimental results, ensures consistency between experimental conditions and actual conditions, optimizes nozzle design, and improves construction efficiency and safety.

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Abstract

The invention relates to the technical field of ocean engineering, in particular to a laboratory calibration method for reducing the flow velocity of a gravity anchor recovery force nozzle. The method comprises the following steps: S1, obtaining a field soil body needing gravity anchor recovery operation through a thin-wall soil sampler, and preparing a triaxial test sample; s2, calculating confining pressure and axial pressure according to field conditions; s3, the prepared sample is installed on a triaxial apparatus, the calculated confining pressure and axial pressure are applied, initial back pressure is applied through a back pressure system of the triaxial apparatus, and the water injection amount changing along with time is recorded; s4, performing a multi-pressure-difference test and fluid viscosity correction based on the initial back pressure applied in S3; and S5, according to a test result, carrying out actual working condition flow velocity conversion. The back pressure value is changed, the corresponding water injection rate and time are recorded, and the flow velocity is corrected in combination with factors such as fluid viscosity, so that the accuracy of an experimental result is improved, and a scientific basis is provided for optimizing a nozzle design.
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