An Experimental Study on Cyclical Thermal Stimulation to Enhance Permeability of Water-bearing Organic-rich Shale

doi:10.11885/j.issn.1674-5086.2019.09.17.03

Abstract

Abstract: Hydraulic fracturing can improve the production of shale gas wells, but its modification scale is mostly concentrated in millimeter-scale cracks. It is difficult to connect micro-nanopores and natural cracks, and a large number of fracturing fluids remained in formation tend to form water phase trapping damage. Organic-rich shale of the lower silurian Longmaxi formation in the Sichuan Basin was selected to simulate heat treatment of shale gas reservoir after hydraulic fracturing. Heating experiments on dry shales with the heating rate of 5℃/min and water-bearing shale with 10℃/min were carried out to monitor parameters such as color change, mass loss, seepage capacity, and wave velocity. Results have shown that color of organic-rich shale turns lighter when temperature rises. Gas permeability increases 3～5 times when dry shales are heated at 600～700℃. Permeability of water-bearing shale improves more significantly after heating at 200～300℃. Wave velocity decreases more after water-bearing shale heating than that of dry shales. Water-rock interaction, hot vapor pressure and spatial thermal stress change induced by heating rate are favorable conditions for reducing threshold temperature of shale.

Key words: organic-rich shale, gas permeability, thermal stimulation, permeability improvement, threshold temperature

CLC Number:

TE377

YOU Lijun, LI Xinlei, KANG Yili, CHEN Mingjun, HAO Zhiwei. An Experimental Study on Cyclical Thermal Stimulation to Enhance Permeability of Water-bearing Organic-rich Shale[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 120-132.

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