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

作　　者：Bao-cheng Wu Si-song Zhang Jian-min Li Yu-ting Pan De-zhi Zeng Hui-yong Yu Hong-jun Zhu 

机构地区：[1]Research Institute of Engineering Technology,PetroChina Xinjiang Oilfield Company,Karamay 834000,China [2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China

出　　处：《Journal of Hydrodynamics》2022年第4期725-743,共19页水动力学研究与进展B辑（英文版）

基　　金：the Sichuan Science and Technology Program(Grant No.21JCQN0066);the National Natural ScienceFoundation ofChina(GrantNo.51774249).

摘　　要：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 thinning.To 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 sections.The 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 process.The 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 rate.The sand content and the displacement significantly affect the erosion rate.Among 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 area.Due 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 

分 类 号：U612[交通运输工程—船舶及航道工程]