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    A Study on Stress Corrosion Crack of Thick Walled Elbow in Manifold for Acid Fracturing

    Source: Journal of Pressure Vessel Technology:;2013:;volume( 135 ):;issue: 002::page 21207
    Author:
    Xie, Yong
    ,
    Zhang, Hong
    ,
    Liu, Shuai
    ,
    Yang, Peng
    ,
    Luo, Xi
    DOI: 10.1115/1.4023420
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Acid fracturing, with a pumping pressure up to 140 MPa for fractural liquid injection, is commonly used in enhanced oil recovery. Subjected to severely high hoop stress, stress corrosion cracking (SCC) often occurs at cracks inside manifold elbows which are due to acid corrosion and fracturing propping agent erosion. To avoid the occurrence of SCC, it is necessary to establish a substantial understanding of the fracture strength of thickwalled elbow, including the stress state distribution in elbow and SCC properties of elbow material. Base on the hoop stress calculation for thin wall straight pipe, a formula for hoop stress of thickwalled elbow is derived and also verified with finite element method (FEM). This is accomplished by introduce curvature factor and wall thickness factor into the formula. Furthermore, the critical stress intensity factor, KISCC, is determined subsequently in simulated acid fracturing corrosion condition. However, part of the considerable contribution of this work is to scale the critical crack depth. A simplified hoop stress formula proposed in this paper can be used in design of elbow wall thickness and strength evaluation. The established critical crack depth calculation formula can be applied to safety assessment of elbows with initial erosion cracks. The proposed method has been proved to be a simple and useful method to calculate the stress and fractural strength of thickwalled elbow.
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      A Study on Stress Corrosion Crack of Thick Walled Elbow in Manifold for Acid Fracturing

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    http://yetl.yabesh.ir/yetl1/handle/yetl/152990
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    contributor authorXie, Yong
    contributor authorZhang, Hong
    contributor authorLiu, Shuai
    contributor authorYang, Peng
    contributor authorLuo, Xi
    date accessioned2017-05-09T01:02:08Z
    date available2017-05-09T01:02:08Z
    date issued2013
    identifier issn0094-9930
    identifier otherpvt_135_2_021207.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/152990
    description abstractAcid fracturing, with a pumping pressure up to 140 MPa for fractural liquid injection, is commonly used in enhanced oil recovery. Subjected to severely high hoop stress, stress corrosion cracking (SCC) often occurs at cracks inside manifold elbows which are due to acid corrosion and fracturing propping agent erosion. To avoid the occurrence of SCC, it is necessary to establish a substantial understanding of the fracture strength of thickwalled elbow, including the stress state distribution in elbow and SCC properties of elbow material. Base on the hoop stress calculation for thin wall straight pipe, a formula for hoop stress of thickwalled elbow is derived and also verified with finite element method (FEM). This is accomplished by introduce curvature factor and wall thickness factor into the formula. Furthermore, the critical stress intensity factor, KISCC, is determined subsequently in simulated acid fracturing corrosion condition. However, part of the considerable contribution of this work is to scale the critical crack depth. A simplified hoop stress formula proposed in this paper can be used in design of elbow wall thickness and strength evaluation. The established critical crack depth calculation formula can be applied to safety assessment of elbows with initial erosion cracks. The proposed method has been proved to be a simple and useful method to calculate the stress and fractural strength of thickwalled elbow.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Study on Stress Corrosion Crack of Thick Walled Elbow in Manifold for Acid Fracturing
    typeJournal Paper
    journal volume135
    journal issue2
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.4023420
    journal fristpage21207
    journal lastpage21207
    identifier eissn1528-8978
    treeJournal of Pressure Vessel Technology:;2013:;volume( 135 ):;issue: 002
    contenttypeFulltext
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