Device and method for testing hydrogen induced cracking of pipeline steel under hydrogen sulfide-containing condition and threshold stress intensity factor determination method

Abstract

The invention discloses a device and a method for testing hydrogen induced cracking of pipeline steel under a hydrogen sulfide-containing condition and a method for determining a threshold stress intensity factor. The device comprises a hydrogen induced cracking test container, a pressure test pump and a hydrogen sulfide storage tank, the hydrogen induced cracking test container is made of target pipeline steel, and at least one group of prefabricated cracks are prefabricated on the inner wall; each prefabricated crack group consists of at least two prefabricated cracks with different depths; and the pressure test pump and the hydrogen sulfide storage tank are connected with the hydrogen induced cracking test container. The test method comprises the following steps: determining experimental parameters of a pipeline steel hydrogen induced cracking test under a hydrogen sulfide-containing condition; preparing a hydrogen induced cracking test container prefabricated with a prefabricated crack group; and carrying out a hydrogen induced cracking test. The determination method comprises the following steps: performing a hydrogen induced cracking test on target pipeline steel, and determining the maximum depth of a crack without crack propagation and the minimum depth of a crack with crack propagation; and further determining a threshold stress intensity factor.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a degradable zinc alloy, a preparation method and application thereof, and a soluble bridge plug. Background technique [0002] Oil and gas pipelines are the "lifeblood" of energy, but oil and gas pipelines are flammable and explosive, and the safety of pipeline transportation has become a social and public safety issue. A certain amount of H is usually contained in the process of development, exploitation and transportation of sour gas fields at home and abroad. 2 S gas, the pipeline is prone to hydrogen-induced cracking damage during the transportation process, which seriously affects the service life of the pipeline. Therefore, the problem of crack prediction and control under the condition of hydrogen sulfide is imminent. [0003] Threshold stress intensity factor is the maximum stress intensity factor corresponding to no delayed fracture of the cracked body. U...

AI Technical Summary

Problems solved by technology

However, there are many problems in the existing conventional hydrogen-induced cracking test methods: first, it cannot fully meet the requirements of theoretical model verification and key parameter correction; second, the threshold stress intensity factor measurement requires a large amount of experimental accumulation; The cracking test test method can only simulate the situation under simple load conditions, and it is difficult to match the actual field conditions

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