Characteristics of proppant transport and placement within rough hydraulic fractures  

作　　者：HUANG Hai ZHENG Yong WANG Yi WANG Haizhu NI Jun WANG Bin YANG Bing ZHANG Wentong 

机构地区：[1]School of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China [2]Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery,Xi’an 710075,China [3]Shaanxi Provincial Key Laboratory of Oil and Gas Well and Reservoir Seepage and Rock Mechanics,Xi’an 710065,China [4]Oil&Gas Field Production Construction Division,PetroChina Tarim Oilfield Company,Korla 841000,China [5]National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China [6]Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710075,China

出　　处：《Petroleum Exploration and Development》2024年第2期453-463,共11页石油勘探与开发（英文版）

基　　金：Supported by National Key Research and Development Program of China(2022YFE0137200);Outstanding Youth Natural Science Fund of Shaanxi Province(2022JC-37);Innovation Capability Support Program of Shaanxi(2023-CX-TD-31);Natural Science Basic Research Project of Shaanxi Province(2024JC-YBQN-0381);National Natural Science Foundation of China(51874240,52204021)。

摘　　要：A three-dimensional reconstruction of rough fracture surfaces of hydraulically fractured rock outcrops is carried out by casting process,a large-scale experimental setup for visualizing rough fractures is built to perform proppant transport experiments.The typical characteristics of proppant transport and placement in rough fractures and its intrinsic mechanisms are investigated,and the influences of fracture inclination,fracture width and fracturing fluid viscosity on proppant transport and placement in rough fractures are analyzed.The results show that the rough fractures cause variations in the shape of the flow channel and the fluid flow pattern,resulting in the bridging buildup during proppant transport to form unfilled zone,the emergence of multiple complex flow patterns such as channeling,reverse flow and bypassing of sand-carrying fluid,and the influence on the stability of the sand dune.The proppant has a higher placement rate in inclined rough fractures,with a maximum increase of 22.16 percentage points in the experiments compared to vertical fractures,but exhibits poor stability of the sand dune.Reduced fracture width aggravates the bridging of proppant and induces higher pumping pressure.Increasing the viscosity of the fracturing fluid can weaken the proppant bridging phenomenon caused by the rough fractures.

关 键 词：reservoir fracturing rough fracture PROPPANT transport and placement characteristics bridging buildup 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]