AAPG PSGD Webinar/Q&A: Gang Han presents Stress-Sensitivity of Fractured Tight Reservoirs скачать в хорошем качестве

AAPG PSGD Webinar/Q&A: Gang Han presents Stress-Sensitivity of Fractured Tight Reservoirs

Stress-Sensitivity of Fractured Tight Reservoirs Presented by Dr. Gang Han Upstream, Aramco Americas President ARMA, 2021-2023 Abstract: It is observed that wells in unconventional reservoirs can experience sharp rate decline in the early stage of production, especially with aggressive drawdown. One key factor affecting rate decline is rock sensitivity to increasing compressive stress. Based on comprehensive rock tests of a fractured tight reservoir, this talk focuses on the stress-dependence of compaction and permeability for anisotropic rock matrix, natural fractures, and hydraulic fractures. The laboratory tests reveal that Despite rock strength in excess of 10,000 psi, the tight rock samples tested in the laboratory showed significant compaction with increasing confining stresses. High values of permeability anisotropy in the rock matrix correlate with abundant laminations. The anisotropy largely vanished as the confining stress increased. In samples with proppant-free hydraulic fractures, the fracture permeability was reduced 70% with a moderate increase in effective confining stress. In comparison, natural fractures or shear fractures stimulated by hydraulic fracturing are more resistant to closure stresses from pressure drawdown. These findings quantify the effectiveness and longevity of the stimulated reservoir volume as an important variable in unconventional reservoir development. Bio: Dr. Gang Han works at the Upstream of Aramco Americas. With 25 years of experience in rock mechanics and geomechanics, he focuses on the technologies related to rock characterization, in-situ stress, hydraulic fracturing, well planning and construction, reservoir performance, and well productivity. Prior to joining Aramco, Dr. Han worked offshore, continental, and unconventional reservoirs from Middle East, Gulf of Mexico, continental USA, North Sea, Southeast and East Asia, Australia, North and West Africa, and South America. He is the President of American Rock Mechanics Association (ARMA, 2021-2023). As the chair of ARMA Technical Committee on Hydraulic Fracturing, he is the founder and the chair of the Hydraulic Fracturing Community, with over 1000 professionals representing 335 global organizations. With over 55 publications in geomechanics, he is regularly invited to give keynotes at professional meetings and societies such as ARMA, SPE, AAPG, SEG, and URTeC. He is a leading author of a multi-industry book, Drilling in Extreme Environments - Penetration and Sampling on Earth and Other Planets. He holds a PhD in Chemical Engineering from the University of Waterloo, Canada.