東海西湖區(qū)塊深部地層復合沖擊破巖機制研究

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Li Jiwei.Composite percusive rock breaking mechanism in deep strata of Xihu block，East China Sea basin[J].China Petroleum Machinery，2025，53（5）：63-69.

關鍵詞：沖擊破巖；機械鉆速；PDC鉆頭；巖石動力學；應力應變中圖分類號：TE242 文獻標識碼：A DOI：10.12473/CPM.202404058

Composite Percussive Rock Breaking Mechanism in Deep Strata of Xihu Block，East China Sea Basin

Li Jiwei（Sinopec Offshore Oil Engineering Co.， Ltd. ； Sinopec Shanghai Offshore Oil & Gas Company）

Abstract：The improvement of rate of penetration（ROP）in deep，high confining pressure formations is closely related to therock breaking method.In the Xihu block of the East China Sea Basin，thepercussive rock breaking method is mainly used to improve ROP.In this paper，a numerical model of dynamic damage in composite percussive rock breaking was built using ANSYS-LS-Dyna.During the simulation，by considering the axial and circumferential impact loads on the bit，the percusson frequency，and the static-dynamic load action time ratio， the influences of percussion frequency and static/dynamic load action time on the penetration depth of the cutter， the rock damage after drilling，and the cuttings morphology were analyzed.The results show that the stress waves of different frequencies have varying degrees of atenuation in the medium，and higher-frequency stress waves attenuate faster，leading toa decrease in rock breaking efect.As the static-dynamic load action time ratio increases，thevibration amplitude at the penetration depth weakens，the cuting surface becomes smooth，and the volume of cuttings formed by rock breaking tend to decrease.The study results have been applied in deep wels in the Xihu block，and provide atheoreticalbasis for further understanding the composite percussive rock breaking mechanism in deep strata and optimizing the engineering parameters of percussion tools.

Keywords： percussive rock breaking； ROP； PDC bit; rock dynamics; stress-strain

0引言

東海盆地西湖凹陷中央背斜帶埋層深、圍壓高，其巖石壓實程度高、研磨性強，導致地層可鉆性差，機械鉆速（ROP）較慢[1-3]。（剩余9074字）