CFD analysis and field observation of tool erosion caused by abrasive waterjet fracturing  

作　　者：Mao Sheng Zhong-Wei Huang Shou-Ceng Tian Yi Zhang Shi-Wang Gao Yun-Peng Jia 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum-Beijing,Beijing 102249,China [2]College of Petroleum Engineering,China University of Petroleum-Beijing,Beijing 102249,China [3]Petroleum Engineering Research Institute of PetroChina Dagang Oilfield Company,Tianjin 300270,China

出　　处：《Petroleum Science》2020年第3期701-711,共11页石油科学（英文版）

基　　金：financially supported by the National Science and Technology Major Project(Nos.2017 ZX05009-003&2016 ZX05028);PetroChina Innovation Foundation(No.2018D-5007-0308)

摘　　要：Abrasive waterjet(AWJ)fracturing has become an accepted horizontal multistage stimulation technique due to its flexibility and high efficiency of extensive fracture placement.The downhole tool failure of AWJ fracturing becomes an issue in the massive hydraulic fracturing because of high velocity and proppant erosion.This paper proposed a 3D computational fluid dynamics(CFD)-based erosion model by considering high-velocity waterjet impact,proppant shear erosion,and specific inner structure of hydra-jet tool body.The discrete phase approach was used to track the proppant transport and its concentration distribution.Field observation provides strong evidence of erosion patterns and mechanisms obtained from CFD simulation.The results show that the erosion rate has a space dependence in the inner wall of the tool body.The severe erosion areas are primarily located at the entries of the nozzle.Evident erosion patterns are found including a‘Rabbit’s ear’erosion at the upper-layer nozzles and a half bottom loop erosion at the lower-layer nozzles.Erosion mechanisms attribute to high flow velocity at the entry of nozzles and the inertia force of proppant.Sensitivity analysis demonstrates that the pumping rate is a primary factor contributing to erosion intensity.

关 键 词：Hydraulic fracturing EROSION Computational fluid dynamics(CFD) Waterjet 

分 类 号：TE983[石油与天然气工程—石油机械设备]