Analysis of Bottom Hole Flow Field Characteristics in Gas Drilling
With Cone Bit

doi:10.11885/j.issn.1674-5086.2013.09.23.01

Abstract

Abstract:

Based on the CFD technique，the bottom hole flow field CFD model is constructed，the bottom hole flow field
of three-cone bit in gas drilling is studied by numerical simulation. We also analyze the impact of nozzle position，side rake
angle，front rake angle and back rack angle on bottom hole flow field. The results show that the setting of three nozzles with
different side rake angles is more conductive to remove rock from bottom of hole than with same side angle，the bottom hole
rock cleaning ability of three nozzles with composite front rake angles is stronger，but cleaning effect on rock cutting structure is
poorer，Under the condition of constant gas displacement，mixing three nozzles with composite front rake angle and back rake
angle enhances cone cutting structure′s cleaning ability and annulus cutting′s carrying capacity，which guarantees a relatively
good bottom hole rock cleaning ability as well. The results of the research provide theoretical guidance for the design and
evaluation of cone bit in gas drilling as well as technical measures for gas drilling.

Key words: gas drilling, cone bit, bottom hole flow field, numerical simulation, nozzle rake angle

Wen Jiewen1, Xiong Jiyou1, Liang Hongjun2, Yu Jing3, Wang Guohua1. Analysis of Bottom Hole Flow Field Characteristics in Gas Drilling
With Cone Bit[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.09.23.01.

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