Effects of Particle Shape on the Meso-structure Stability of Fracture Plugging Zones

doi:10.11885/j.issn.16745086.2020.12.20.02

Abstract

Abstract: The stability of fracture plugging zone has a great impact on the lost circulation control effect in fractured reservoirs. To investigate the effect of particle shape on the stability of the mesoscopic structure of fracture plugging zone, polycarbonate particles with five different shapes are chosen for the photoelastic experiment. Photoelastic images of the simulated fracture plugging zone under shear loads are obtained to characterize the mesoscopic structure evolution of fracture plugging zone. The key parameters for the mesoscale structure characterization of fracture plugging zone are proposed based on the mean square gray gradient method, including the strong force chain and its orientation. The experimental results show that adding elliptic, equilateral triangular, square, and rectangular particles into fracture plugging zone formed by circular particles can make the structure of the force chain more varied and increase ring-like strong force chain. The contribution of long strip particles to the stability of the meso-structure of fracture plugging zone is larger than the regular polygon particles as the pressure fluctuation applies on the fracture plugging zone. The angular particles disperse the direction of force better than the circular ones, which makes the meso-structure of fracture plugging zone more stable. The effect of lost circulation control is improved when the proportion of angular and long strip particles is about 40% of rigid lost circulation materials (LCMs). Based on this understanding, the prescriptives of lost circulation control is adjusted, and the bearing capacity of the fracture plugging zone is enhanced. Field test of lost circulation control are successful once.

Key words: drilling, lost circulation control, fracture plugging zone, granular matter, geometric shapes, mesoscopic structure, force chain, photoelastic experiment

CLC Number:

TE28

KANG Yili, JING Haoran, XU Chengyuan, YAN Xiaopeng, SHANG Xiangyu. Effects of Particle Shape on the Meso-structure Stability of Fracture Plugging Zones[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 81-92.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I3/81

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