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Numerical Analysis of Residual Strength in the perforated casing of Ultra Deep Wells

Fluid Dynamics & Materials Processing 2023年第1期19卷 261-271页

作者： Yanxian Wu Shouming Zhong Zhigang Guan Lin Song Kun Li Jiarui Sun Yuqiang Xu Maochuan Tu Chaobin Fan Jinbin Yang Engineering Technology Research Institute of Petro China Xinjiang Oilfield Company Karamay834000China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China SINOPEC Xinan Oilfield Service Corporation Deyang618000China SINOPEC Southwest China Oil&Gas Company Chengdu610041China

A three-dimensional model for the numerical simulation of casing-cement behavior is used to investigate residual strength in the perforated casing of ultra deep *** influence of the hole diameter,hole density and phase angle on the residual strength of the casing under non-uniform stress and fracturing conditions is revealed through the consideration of different perforation *** is shown that the residual strength of the casing increases with the hole diameter and periodically changes with the hole density;the phase angle is the main factor that affects the residual strength of the perforated casing,and the perforation should be avoided in the direction of the minimum principal stress to reduce stress concentration at the perforation ***,as shown by a companion orthogonal experiment,the descending order of influence of the different influential parameters is:phase angle,hole diameter,hole density and the thickness of casing.

关键词： perforated casing non-uniform stress residual strength orthogonal experiment

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Simulation of the erosion of casing and perforation under staged sand fracturing conditions in horizontal sections

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Journal of Hydrodynamics 2022年第4期34卷 725-743页

作者： Bao-cheng Wu Si-song Zhang Jian-min Li Yu-ting Pan De-zhi Zeng Hui-yong Yu Hong-jun Zhu Research Institute of Engineering Technology PetroChina Xinjiang Oilfield CompanyKaramay 834000China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

The new fracturing technology of intensive stages and high-intensity proppant injection shows significant advantages of cost reduction and high efficiency in the volume fracturing of unconventional reservoirs,but it also intensifies the erosion of the casing and the perforations,with a perforation diameter expansion and the casing wall *** solve this problem,in view of the applications of the perforation fracturing technology under the construction conditions in Mahu Area in Xinjiang,China,the structure parameters of the downhole strings are measured and a calculation model of the perforation casing erosion is established for the large-displacement sand fracturing process in horizontal *** software ANSYS-FLUENT is used to simulate the casing and perforation erosion under different conditions of the displacement,the sand content,the proppant particle size,and the fracturing fluid viscosity in the sand fracturing *** particle size of the proppant and the viscosity of the fracturing fluid mainly affect the erosion area,but they have little influence on the erosion *** sand content and the displacement significantly affect the erosion *** these factors,the sand content has a more significant effect on the erosion rate and the displacement has a more significant effect on the erosion *** to the influence of gravity,the perforation erosion rate is larger when the phase angle ranges from 120°to 240°.

关键词： Sand fracturing erosion numerical simulation perforated casing solid-liquid flow

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