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Simulation Analysis of Igneous Rock Breaking Law Under Cut-Impact Load

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
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Chemistry and Technology of Fuels and Oils Aims and scope

Aiming at the problem of low efficiency of breaking Igneous rock, the models of breaking Igneous rock under cut-impact loads by spherical cutter, wedge cutter, and conical cutter were established respectively based on rock mechanics and finite element theory, and the Igneous rock breaking processes of three types of cutter under different combinations of impact parameters are simulated. The variation curves with impact parameters of Igneous rock breaking depth and volume, mechanical specific energy, and average tangential force of cutters are subsequently obtained, and the influence of cutter types, impact frequency, impact force on rock breaking efficiency were analyzed. Moreover, the mechanical properties of the cores collected from Hashan block and Mulei block in Junggar basin are analyzed by expariments under the condition of confining pressure. When the confining pressure reaches 60 MPa, the compressive strength of HS-3 and ML-3 rock samples reach 730.72 MPa and 301.75 MPa respectively. The results show that the impact resistance of spherical cutter is the best. When the weight of bit is 600 N and cutting speed is 1000 mm/s, the rock breaking efficiency of spherical cutter is the lowest, followed by conical cutter, and the wedge cutter is the highest. The drilling bit used in breaking Igneous rock under cut-impact loads should be a combination of these three types of cutters, which could improve the rock breaking efficiency by impact operation, and ensure the service life of bit. The results could provide basis for the design of drill bit and the parameters selection of impact tools for Igneous rock.

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Acknowledgement

This work was supported by the SINOPEC Key Laboratory Project “Experimental study on the mechanism of rock broken by coupling with cut and impact in deep hard strata” [number KL22066]. This study received funding from SINOPEC. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication. All authors declare no other competing interests.

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Correspondence to Zou Deyong.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 113–118 September–October, 2022.

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Jifei, C., Deyong, Z., Cheng, L. et al. Simulation Analysis of Igneous Rock Breaking Law Under Cut-Impact Load. Chem Technol Fuels Oils 58, 862–872 (2022). https://doi.org/10.1007/s10553-022-01461-w

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