Study on coring bit selection for Paleogene plastic-brittle strata in Cangzhou Salt Mine

JING Long and LI Wei; ${author.authorNameEn}

doi:10.12143/j.ztgc.2022.06.010

2022 Vol. 49, No. 6

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JING Long and LI Wei, . 2022. Study on coring bit selection for Paleogene plastic-brittle strata in Cangzhou Salt Mine. DRILLING ENGINEERING, 49(6): 71-78. doi: 10.12143/j.ztgc.2022.06.010

Citation:

JING Long and LI Wei, . 2022. Study on coring bit selection for Paleogene plastic-brittle strata in Cangzhou Salt Mine. DRILLING ENGINEERING, 49(6): 71-78. doi: 10.12143/j.ztgc.2022.06.010

Study on coring bit selection for Paleogene plastic-brittle strata in Cangzhou Salt Mine

JING Long and LI Wei^1,2,
³

No. 3 Geological Brigade of Hebei Geology and Mineral Exploration Bureau, Hengshui Hebei 053000, China;Hebei Institute of Geothermal Resources Development, Hengshui Hebei 053000, China,No. 4 Geological Brigade of Hebei Geology and Mineral Exploration Bureau, Cangzhou Hebei 061000, China

Received Date: 25 August 2021

Revised Date: 30 April 2022

Abstract

Abstract

Three exploration boreholes have been completed in the Cangzhou Salt Mine general survey project， with the drilling depth ranging from 3000 to 3451m， and the total coring length of 3791m in Paleogene plastic-brittle formation. Based on the drilling characteristics， the proper bit selection principle was determined for the elastic-plastic interval and brittle interval in the work area. After several tests and improvements， 15 kinds of bits belonging to three categories-carbide， PDC and Balas were used. Comprehensive analysis was carried out according to the bit structure， rock fragmentation mechanism and application effect， and three kinds of bits of H-4-Ⅱ， F-3 and F-6 were optimized. These bits had high efficiency and good coring quality when drilling in Paleogene strata， which are suitable for the geological conditions in the work area， and can be recommended to popularize and apply in this area.
- Paleogene /
- plastic-brittle formation /
- coring bit /
- carbide drill bits /
- PDC drill bits

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References

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