水平井段脉冲携岩数值模拟研究

发布时间：2018-06-04 04:15

本文选题：脉冲携岩 + 水平井　；参考：《西南石油大学学报(自然科学版)》2016年06期

【摘要】：水平井钻井技术已成为现代油气勘探开发的重要手段,水平井段岩屑运移不畅造成钻井过程中的高摩阻和扭矩、卡钻和憋泵等情况,影响钻具的使用寿命和钻进安全,特别是使用现有的常规携岩方法无法解决,为此,提出脉冲携岩方法。在现有水力脉冲的基础上,根据分流继能机理,建立小井眼水平井岩屑运移的流场模型,采用RNG k-ε模型、幂律模式及二次开发子程序进行数值计算,确定脉冲携岩合理的脉冲周期、占空比等参数,并研究水力脉冲条件下钻井液排量、偏心度、岩屑粒径等参数对偏心环空岩屑运移的影响,得到环空岩屑运移速度和浓度的分布规律。研究表明,在同等条件下,脉冲携岩效率更高,破坏岩屑床效果更好,降低岩屑床浓度约40%。
[Abstract]:Horizontal well drilling technology has become an important means of modern oil and gas exploration and development. The failure of cuttings movement in horizontal well section results in high friction and torque during drilling, drilling jam and pump holding, etc., which affect the service life and drilling safety of drilling tools. Especially, the conventional rock carrying method can not be solved, so the pulse rock carrying method is put forward. Based on the existing hydraulic pulse, the flow field model of cuttings migration in slim hole horizontal wells is established according to the principle of secondary energy distribution. The numerical calculation is carried out by using RNG k- 蔚 model, power law model and secondary development subroutine. The reasonable pulse period, duty cycle and other parameters are determined. The effects of drilling fluid displacement, eccentricity and cuttings particle size on the migration of eccentric annulus cuttings are studied under the condition of hydraulic pulse. The distribution of the velocity and concentration of cuttings in annulus is obtained. The results show that under the same conditions, the pulse carrying efficiency is higher, the effect of destroying cuttings bed is better, and the concentration of cuttings bed is reduced by about 40%.
【作者单位】：西南石油大学机电工程学院;
【基金】：国家自然科学基金(51222406) 教育部新世纪优秀人才支持计划(NCET-12-1061)
【分类号】：TE243

【相似文献】