Numerical Simulation of Annulus Flow Field for Under-size
Stabilizer Annulus

doi:10.11885/j.issn.1674-5086.2013.06.08.03

Abstract

Abstract:

Abstract：The under-size stabilizer have multiple functions in the steerable drilling for shale gas，which could not only control
well trajectory，but also help reduce friction/torque，reduce the risk of drilling resistance and improve hole cleaning status. While
the annulus flow characteristics and mechanism of the inadequate spiral stabilizer are not perfect. To solve these problems，we
stimulate the annulus fluid flow characteristics of the inadequate spiral stabilizer with the turbulent viscosity model method and
Realizable k-epsilon turbulence model，and the results show that：the annulus flow around the stabilizer inlet section is more
stable，beginning to appear in flow close to the position of the stabilizer；in the stabilizer annulus downstream section（lateral
stabilizer and outlet section），the annulus velocity，total pressure and distribution of the dynamic pressure bears axis symmetry
flow respectively. The formation，development and distribution of this section are the spiral shape，which is good to clearing
borehole cuttings bed. In addition，the eddy flow amount is big and，the development of streamline is irregular，which means
the spiral structure of the stabilizer leads to the fluid flowing around. The around flow forms a large number of eddy flow，
accompanied by a greater dynamic pressure，and the induced exciting force by dynamic pressure will increase the vibration of
drill string.

Key words: Key words：shale gas, steerable assembly, spiral stabilizer, under-size stabilizer, flow field simulation

Chen Yingjie1, Deng Chuanguang1, Chang Hongqu1, Li Xiangbi1, Ma Tianshou2. Numerical Simulation of Annulus Flow Field for Under-size
Stabilizer Annulus[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.06.08.03.

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