About

Munhong (Robin) Hui

Senior Research Scientist

Munhong (Robin) Hui is a senior reservoir modeling and simulation expert with more than 20 years of experience developing and deploying advanced subsurface technologies for complex carbonate and unconventional reservoirs.

Robin joined ResFrac after a long tenure at Chevron, where he served as a Senior Research Scientist and Product Owner, leading the development of upscaling, reservoir simulation, history-matching, and optimization workflows used to support critical asset decisions.

Robin’s work focuses on physics-based and data-driven modeling of fluid flow in fractured reservoirs, including coupled flow–geomechanics. He has made significant contributions to discrete fracture modeling and data–physics hybrid approaches, authoring numerous peer-reviewed publications in these areas. His work bridges fundamental research and practical deployment, with an emphasis on scalable, production-ready solutions.

Robin is an active member of the Society of Petroleum Engineers (SPE), where he serves on a local Section Board and multiple Conference Technical Program Committees. He has received an SPE Regional Award in Reservoir Description & Dynamics and has served on the U.S. Department of Energy’s Methane Hydrate Advisory Committee. He also holds several patents related to reservoir modeling and simulation technologies.

He holds a Ph.D. in Petroleum Engineering from Stanford University and a B.S. in Chemical Engineering from the National University of Singapore.

Outside of work, Robin enjoys playing tennis, hiking, biking, cooking, and gardening.

Please click here for a list of Robin’s publications.

Munhong's posts

Production impact of horizontal fractures

At the 2025 SPE International Hydraulic Fracturing Technology Conference, we (Dontsov, Zoback, McClure, and Fowler) presented “Hydraulic Fracture Propagation Along Bedding Planes Might Be More Prevalent Than We Think” (SPE-226637). The paper reviewed case studies with evidence of horizontal or bedding plane fractures from microseismic, fiber optics, core observations, and casing deformation.

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Testing the new Kryvenko model for proppant washout

What controls proppant placement during hydraulic fracturing? As described in Chapter 8 from McClure et al. (2025), ResFrac incorporates a variety of physical processes – viscous drag, gravitational settling, hindered settling, clustered settling, bed slumping, and more. In addition, ResFrac accounts for the complex physics associated with proppant flowing out of the wellbore (Dontsov, 2023; Ponners et al., 2025).

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Horizontal fracture initiated along weak bedding plane or frictional interface in ResFrac

Horizontal hydraulic fractures in ResFrac

Horizontal hydraulic fracture propagation is believed to be widespread in shale plays where the frac gradient approaches the overburden – such as the Vaca Muerta, Utica, and Montney. However, horizontal propagation is nearly always ignored in hydraulic fracture modeling. In ResFrac, we are obsessed with ‘getting the physics right’, and so naturally, we extended our simulator to handle horizontal fracturing. The first version of this new capability was released earlier this year. We are eager to start collecting feedback from users, which will help us to fine tune the algorithm and workflow.

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