Sealing Mechanism Based on Force Chain and Experimental Investigation of Sealing Fractures | Zendy

Dan Bao | Zendy; Chengyu Zhou | Zendy; Lei Wang | Zendy; Peng Zhang | Zendy; Zhenfu Jia | Zendy; Wenlong Zhang | Zendy

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Sealing Mechanism Based on Force Chain and Experimental Investigation of Sealing Fractures

Author(s) -

Dan Bao,

Chengyu Zhou,

Lei Wang,

Peng Zhang,

Zhenfu Jia,

Wenlong Zhang

Publication year - 2021

Publication title -

lithosphere

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.737

H-Index - 43

eISSN - 1941-8264

pISSN - 1947-4253

DOI - 10.2113/2021/2573782

Subject(s) - lost circulation , seal (emblem) , drilling , stiffness , materials science , mechanism (biology) , petroleum engineering , drilling fluid , composite material , fracture (geology) , shear (geology) , shear force , mechanical engineering , geology , engineering , art , philosophy , epistemology , visual arts

Lost circulation often occurs in fractured formations, which was a main technological problem during drilling. Conventional lost circulation material (LCM) was often used to form a plugging zone to prevent fluid loss during drilling. The formed seal was a granular material system composed of LCMs. This paper presented the physical mechanism of the force chain within the plugging zone. The seal performance is related to the properties of LCMs. A device for testing seal performance of LCMs with long fracture was developed. The effects of LCM performance on seal integrity were investigated using a plugging device with long fracture. The results showed that the wide particle size distribution (PSD) of LCMs tended to form a strong force chain network structure within the sealing zone. Increasing the stiffness and roughness of LCMs resulted in higher breaking pressure. The addition of fiber with high length-diameter ratio could improve the shear strength of the sealing zone and form a strong force chain network structure, and it can reduce fluid loss.

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