Stress corrosion experimental method for full-scale marine oil and gas pipeline

Abstract

The invention relates to a stress corrosion experimental method for a full-scale marine oil and gas pipeline. An experimental device adopted by the method comprises an axial loading device, a torsional loading device, a bending loading device, two corrosion experimental water tanks (10 and 13), a pipeline fixing device and an outer wall 18. The experimental method comprises the following steps: preparing an experimental water sample and a reference water sample; controlling the temperature and humidity; connecting a connecting data line of a stress sheet to a stress measuring instrument and controlling the concentrations of oxygen in an experimental box and a reference box; according to experimental requirements, applying an axial load, a torsional load, a bending load or a complicated load; reading a stress numerical value by means of a stress measuring instrument and calculating a stress value; and researching influence of a single variable on an experimental pipeline by means of a method of controlling variables, including oxygen concentration, of the experimental box and the reference box.

Description

technical field [0001] The invention relates to an experimental method for simulating the corrosion process of ocean engineering pipelines under complex load conditions. Background technique [0002] In the offshore oil and gas production system, underwater structures such as oil and gas transmission pipelines account for a considerable proportion of the total offshore oil and gas investment, especially in deep sea development where oil fields are far away from land, and the proportion of investment in the transmission system will be even higher, such as the Canyon in the Gulf of Mexico. The water depth of the Express gas field is 2,225 meters, and the pipeline is 100 kilometers long; the Liwan 3-1 gas field in the South my country Sea has a water depth of 1,480 meters. It is planned to use multiple deep-water manifolds to transport the collected natural gas to the shallow water area through a 75-kilometer-long pipeline The central platform for processing and so on. Therefore...

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Problems solved by technology

[0004] 1. Most of them are experimental test methods for scaled-scale pipes, and there are few experimental methods for full-scale pipes. For example, the application numbers are CN101226135A, CN10 5136596A, etc., all of which are based on scaled-scale pipe specimens or material research Corrosive properties

[0005] 2. The type of load applied in the experiment is limited, especially the function of applying the bending moment load is lacking. For example, the application number CN105136596A can only measure the loading situation of the constant displacement load. The experimental methods described in the application numbers CN201610030544.1 and CN201510296350.1 only Capable of loading tensile stress, etc.

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