Effect of thermochemical fluids on fracturing pressure in tight reservoirs

doi:10.3969/j.issn.1006-6535.2025.04.010

Abstract

Abstract: Aiming at the challenges in reducing fracturing pressure to enhance fracturing efficiency in the field of efficient unconventional hydrocarbon development,this study employs mechanism analysis,numerical simulation,and comprehensive comparison to investigate the selected exothermic reaction system of ammonium chloride and sodium nitrite (NH₄Cl-NaNO₂). It clarifies the temperature and pressure variation patterns generated by this exothermic system in tight sandstone cores and its impact on rock mechanical parameters,and compares this system with conventional hydraulic fracturing regarding fracturing pressure and fracture initiation. The results indicate that the NH₄Cl-NaNO₂ exothermic system can generate a maximum temperature of 133 ℃ and a high pressure of 11 MPa in the core.Simulation results align with laboratory experiments,showing that this system can effectively increase the Young′s modulus and reduces the Poisson′s ratio of tight sandstone.Compared with conventional hydraulic fracturing, the rock fracturing pressure is reduced by 23.76%.This research is significant for promoting the efficient development of unconventional hydrocarbons and advancing the application level of thermochemical fluid fracturing technology.

Key words: thermochemical fluid, tight reservoir, fracturing pressure, rock mechanical parameters, numerical simulation

CLC Number:

TE348

LAI Fengpeng, ZHANG Haonan, CAO Longtao, LIU Kaiyuan, ZHAO Qianhui, MIAO Lili. Effect of thermochemical fluids on fracturing pressure in tight reservoirs[J]. Special Oil & Gas Reservoirs, 2025, 32(4): 87-93.

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