Numerical simulation of proppant transport with multi-stage alternating injection in CO2 hybrid fracturing

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-26 DOI:10.1016/j.powtec.2025.120840

Yong Zheng , Zhigang Wang , Haoyu Chen , Hai Huang , Jun Ni , Liangbin Dou , Haizhu Wang , Bin Wang

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引用次数: 0

Abstract

Effective proppant placement has been one of the key objectives of reservoir stimulation. CO₂ hybrid fracturing is promising for the economic production of unconventional reservoirs, however, there is a lack of understanding of proppant transport within the rough fractures associated with it. In this study, a validated CFD-DEM model is used to simulate proppant transport with multi-stage alternating injection in CO₂ hybrid fracturing, focusing on evaluating the advantages of alternating injection within a rough fracture as well as the influence laws of key parameters. The simulation results show that the use of multi-stage alternating injection of proppant with different fluids in CO₂ hybrid fracturing can obtain better proppant placement than single fluid continuous pumping, with 36.4 % and 4.4 % higher proppant dune lengths, and 3.51 % and 2.3 % higher dune placement rate than single CO₂ pumping and water pumping, respectively. The optimal number of injection stages in multi-stage alternating injection of proppant is 4, while the optimal segment plug length ratio of CO₂ and water is 3:1. The best dune length and placement rate are obtained when the CO₂ segment plug is injected at a velocity of 0.1 m/s, but when the CO₂ segment plug is injected at a velocity of 0.2 m/s, it is favorable for the safety of the pipeline and equipment during fracturing operation.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.