Offshore oil and gas flexible hose annulus nondestructive detection device and method

Abstract

The invention discloses an offshore oil and gas flexible hose annulus nondestructive detection device and method. The detection device comprises a gas sample collection sealing box, an annulus pressure test box and a gas supply device, a gas sample collection bag is arranged in the gas sample collection sealing box; the annulus pressure test box comprises a vacuum pump, a gas-liquid separator, a flow meter, a pressure gauge, a ball valve, a pressure reducing valve and a safety valve; the gas supply device comprises a nitrogen cylinder, and the nitrogen cylinder is connected with the gas sample collection bag and a flexible hose through a pipeline in the annular pressure test box; and the vacuum pump is connected with the gas sample collecting bag. The detection method comprises the following five tests: flexible hose annulus gas sample collection, flexible hose gas permeability test, flexible hose annulus volume measurement and calculation, flexible hose outer protection layer leakage detection and flexible hose annulus corrosion protection. The function of detecting the real annulus condition of the flexible hose can be achieved, and meanwhile data support and technical guidance are provided for the safe operation of the flexible hose and prolonging of the actual service life of the flexible hose.

Description

technical field [0001] The invention relates to an offshore oil and gas gathering and transportation flexible hose detection technology, in particular to a nondestructive detection device and method for an offshore oil and gas flexible hose annulus. Background technique [0002] Offshore oil and gas flexible hoses are mainly used for marine flexible hoses and submarine pipelines developed in offshore oil and gas fields. They are generally composed of multiple layers of high-strength metal layers and high-barrier polymer layers in a non-bonding manner. The pipe body is mainly composed of a skeleton layer, an internal pressure sealing layer, a compressive armor layer, a tensile armor layer and an outer protective layer from the inside to the outside. The skeleton layer is made of corrosion-resistant metal material, and plays a supporting role against external pressure. Both the internal pressure sealing layer and the outer protective layer are polymer materials. The inner pre...

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Problems solved by technology

If the condensed water is not discharged out of the pipe in time after the annulus is formed, it may cause flooding; if the annulus pressure reaches the upper limit and cannot be discharged as soon as possible, the outer protective layer will bulge or even be damaged; when the pressure relief of the inner pipe does not match the pressure of the annulus, can lead to the collapse of the matrix layer; CO infiltration into the annulus 2 、H 2 When S gas meets the condensed water vapor in the annulus, it will form a corrosive environment, which will cause damage to the metal reinforcement, especially for dynamic hoses, under alternating stress and H 2 Under the combined action of S, it will induce stress corrosion fatigue of the annular metal layer, greatly reducing the actual service life of the flexible hose

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