A Study on Stress Corrosion Crack of Thick Walled Elbow in Manifold for Acid FracturingSource: Journal of Pressure Vessel Technology:;2013:;volume( 135 ):;issue: 002::page 21207DOI: 10.1115/1.4023420Publisher: 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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contributor author | Xie, Yong | |
contributor author | Zhang, Hong | |
contributor author | Liu, Shuai | |
contributor author | Yang, Peng | |
contributor author | Luo, Xi | |
date accessioned | 2017-05-09T01:02:08Z | |
date available | 2017-05-09T01:02:08Z | |
date issued | 2013 | |
identifier issn | 0094-9930 | |
identifier other | pvt_135_2_021207.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/152990 | |
description 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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | A Study on Stress Corrosion Crack of Thick Walled Elbow in Manifold for Acid Fracturing | |
type | Journal Paper | |
journal volume | 135 | |
journal issue | 2 | |
journal title | Journal of Pressure Vessel Technology | |
identifier doi | 10.1115/1.4023420 | |
journal fristpage | 21207 | |
journal lastpage | 21207 | |
identifier eissn | 1528-8978 | |
tree | Journal of Pressure Vessel Technology:;2013:;volume( 135 ):;issue: 002 | |
contenttype | Fulltext |