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Hydraulic structure design and downhole flow field optimization of geophysical drill bits in a limestone stratum.
Sci Prog. 2020 Jul-Sep; 103(3):36850420931257.SP

Abstract

The hydraulic structure of conventional geophysical drill bit is designed for the general stratum. When conventional geophysical drill bit pierces into a limestone stratum, the shape of cuttings is large because of the high brittleness of limestone. The cuttings are ground repeatedly; this phenomenon can reduce drilling efficiency and increase drilling costs. According to the characteristics of limestone cuttings, the numerical simulation method is used to research downhole flow field characteristics of conventional geophysical drill bit. First, the influence of key hydraulic structure parameters on cuttings removal performance is found. Then, the hydraulic structure is optimized. The flow field characteristics of the hydraulic structure of the geophysical drill bit before and after optimization in the flow path is analyzed, at the bottom of the bit and the annulus area of the shaft lining. The optimized downhole crossflow area increased from 50% to 98%. No vortex was observed at the exit of the flow path and cuttings groove. The downhole pressure gradient increased from 0.12 Mpa to 0.15 Mpa. The cutting removal space in the annulus area of the shaft lining is fully utilized. Field tests show that the cutting removal and drilling performance of optimized geophysical drill bit has improved and the drilling speed increases by 20.6%.

Authors+Show Affiliations

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, P.R. China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32584162

Citation

Zhu, Jing, et al. "Hydraulic Structure Design and Downhole Flow Field Optimization of Geophysical Drill Bits in a Limestone Stratum." Science Progress, vol. 103, no. 3, 2020, p. 36850420931257.
Zhu J, Huang Z, Ma Y, et al. Hydraulic structure design and downhole flow field optimization of geophysical drill bits in a limestone stratum. Sci Prog. 2020;103(3):36850420931257.
Zhu, J., Huang, Z., Ma, Y., Xie, D., Yang, X., & Zhou, C. (2020). Hydraulic structure design and downhole flow field optimization of geophysical drill bits in a limestone stratum. Science Progress, 103(3), 36850420931257. https://doi.org/10.1177/0036850420931257
Zhu J, et al. Hydraulic Structure Design and Downhole Flow Field Optimization of Geophysical Drill Bits in a Limestone Stratum. Sci Prog. 2020 Jul-Sep;103(3):36850420931257. PubMed PMID: 32584162.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Hydraulic structure design and downhole flow field optimization of geophysical drill bits in a limestone stratum. AU - Zhu,Jing, AU - Huang,Zhiqiang, AU - Ma,Yachao, AU - Xie,Dou, AU - Yang,Xueying, AU - Zhou,Cao, PY - 2020/6/26/entrez PY - 2020/6/26/pubmed PY - 2020/6/26/medline KW - Limestone stratum KW - field test KW - flow field KW - geophysical drill bit KW - hydraulic structure SP - 36850420931257 EP - 36850420931257 JF - Science progress JO - Sci Prog VL - 103 IS - 3 N2 - The hydraulic structure of conventional geophysical drill bit is designed for the general stratum. When conventional geophysical drill bit pierces into a limestone stratum, the shape of cuttings is large because of the high brittleness of limestone. The cuttings are ground repeatedly; this phenomenon can reduce drilling efficiency and increase drilling costs. According to the characteristics of limestone cuttings, the numerical simulation method is used to research downhole flow field characteristics of conventional geophysical drill bit. First, the influence of key hydraulic structure parameters on cuttings removal performance is found. Then, the hydraulic structure is optimized. The flow field characteristics of the hydraulic structure of the geophysical drill bit before and after optimization in the flow path is analyzed, at the bottom of the bit and the annulus area of the shaft lining. The optimized downhole crossflow area increased from 50% to 98%. No vortex was observed at the exit of the flow path and cuttings groove. The downhole pressure gradient increased from 0.12 Mpa to 0.15 Mpa. The cutting removal space in the annulus area of the shaft lining is fully utilized. Field tests show that the cutting removal and drilling performance of optimized geophysical drill bit has improved and the drilling speed increases by 20.6%. SN - 2047-7163 UR - https://www.unboundmedicine.com/medline/citation/32584162/Hydraulic_structure_design_and_downhole_flow_field_optimization_of_geophysical_drill_bits_in_a_limestone_stratum L2 - http://journals.sagepub.com/doi/full/10.1177/0036850420931257?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -
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