首页|Characteristics of proppant transport and placement within rough hydraulic fractures

Characteristics of proppant transport and placement within rough hydraulic fractures

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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 ex-periments.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.

reservoir fracturingrough fractureproppanttransport and placement characteristicsbridging buildup

HUANG Hai、ZHENG Yong、WANG Yi、WANG Haizhu、NI Jun、WANG Bin、YANG Bing、ZHANG Wentong

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School of Petroleum Engineering,Xi'an Shiyou University,Xi'an 710065,China

Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery,Xi'an 710075,China

Shaanxi Provincial Key Laboratory of Oil and Gas Well and Reservoir Seepage and Rock Mechanics,Xi'an 710065,China

Oil & Gas Field Production Construction Division,PetroChina Tarim Oilfield Company,Korla 841000,China

National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China

Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an 710075,China

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2024

10.1016/S1876-3804(24)60036-4

石油勘探与开发(英文)
中国石油天然气股份有限公司勘探开发研究院 中国石油集团科学技术研究院

石油勘探与开发(英文)

ISSN：2096-4803
年,卷(期)：2024.51(2)