A non-destructive testing device and method for offshore oil and gas flexible hose annulus
A non-destructive testing and flexible technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as damage, reduced service life of flexible hoses, and collapse of the skeleton layer
Active Publication Date: 2021-10-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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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
Method used
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[0124] Before operation, the valves of the whole device are closed. At the same time, to avoid H 2 For the hazards caused by high-risk gases such as S, the operator must wear a gas mask before entering the workplace, and take it off after completing the test task and leaving the work area to reach a safe location.
[0125] image 3 It is a schematic diagram of the overall structure of the entire detection system, which can realize the functions of the above five aspects, which are explained separately below:
[0126] 1. Flexible hose ring air sample collection
[0127] Figure 4 is a schematic diagram of flexible hose ring air sample collection, refer to Figure 4 Connect the experimental equipment, follow the steps below to sample the ambient air, the specific steps are as follows:
[0128] ① Vacuum the gas sample collection bag and connecting piping system. Close the ball valve 12, open the valves 15-20 of the gas sample collection bag, start the vacuum pump 1, and eva...
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The invention discloses an annulus non-destructive detection device and method for a flexible offshore oil and gas hose. The detection device includes a gas sample collection sealed box, an annular pressure test box, and a gas supply device; the gas sample collection sealed box has a gas sample collection bag, The annular pressure test box includes 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 includes a nitrogen bottle, and the nitrogen bottle passes through the pipeline and the gas sample in the annular pressure test box The collection bag and the flexible hose are connected respectively; the vacuum pump is connected with the gas sample collection bag. The testing method includes testing of the following five items: flexible hose annular air sample collection, flexible hose gas permeability test, flexible hose annulus volume measurement, flexible hose outer protective layer leakage detection, flexible hose annulus corrosion protection . It can realize the function of detecting the real condition of the flexible hose annulus, and at the same time provide data support and technical guidance for the safe operation of the flexible hose and improve 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-bonded 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 pres...
Claims
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IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 王凯赵炳亮谢磊毛港涛茅磊
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY