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工程设计学报  2023, Vol. 30 Issue (4): 521-530    DOI: 10.3785/j.issn.1006-754X.2023.00.047
机械优化设计     
基于EDEM-Fluent耦合的激光机械钻头井底流场与排屑性能研究
李琴(),雷雨薇,孙浩翔,代茂林,陈科
西南石油大学 机电工程学院,四川 成都 610500
Study on downhole flow field and chip removal performance of laser mechanical drill bit based on EDEM-Fluent coupling
Qin LI(),Yuwei LEI,Haoxiang SUN,Maolin DAI,Ke CHEN
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
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摘要:

激光机械钻头是一种新型破岩装备,适用于超深层油气资源的开发。在钻进过程中,先利用激光对岩石进行辐射,使得机械钻头能够快速破岩,但同时会产生大量岩屑。若激光机械钻头的排屑性能不佳,则会导致二次钻井以及钻头磨损加剧,而钻头起下钻频繁会严重影响钻井效率。为此,以提高激光机械钻头排屑性能为目标,建立了激光机械钻头三维模型,利用EDEM-Fluent耦合方法对其排屑过程进行了数值模拟;同时,通过对激光机械钻头井底流场的分析,提出了排屑性能指标,并采用正交试验法对其流道倾角、流道直径以及激光通道宽度进行了优化,从而改进了其井底流场和排屑性能。结果表明:优化后激光机械钻头的流道倾角为17°,流道直径为10 mm,激光通道宽度为5 mm;井底低速区面积占比为11.07%,下降了26.19个百分点;井底径向漫流速度为27.93 m/s,提高了61.54%;环空岩屑运移速度为8.97 m/s,提高了46.57%;平均岩屑滞留量减少了46.38%,平均岩屑堆积量减少了59.43%。综上,优化后激光机械钻头的排屑性能得到了有效提升。研究结果可为激光机械钻头水力结构的设计提供数据参考。

关键词: 激光机械钻头EDEM-Fluent耦合水力结构井底流场排屑性能    
Abstract:

Laser mechanical drill bit is a new type of rock-breaking equipment, which is suitable for the development of ultra-deep oil and gas resources. In the process of drilling, the laser is first used to irradiate the rock, so that the mechanical drill bit can quickly break the rock, but at the same time, a large number of rock chip will be produced. If the chip removal performance of the laser mechanical drill bit is poor, it will lead to the secondary drilling and the bit wear will be aggravated, and frequent bit trips will seriously affect the drilling efficiency. Therefore, in order to improve the chip removal performance of the laser mechanical drill bit, a three-dimensional model of the laser mechanical drill bit was established, and the chip removal process was numerically simulated by using the EDEM-Fluent coupling method; at the same time, through the analysis of the downhole flow field of the laser mechanical drill bit, the chip removal performance indexes were put forward, and the flow channel inclination angle, flow channel diameter and laser channel width were optimized by the orthogonal test method, so as to improve the downhole flow field and chip removal performance. The results showed that after optimization, the laser mechanical drill bit had a flow channel inclination angle of 17°, a flow channel diameter of 10 mm, and a laser channel width of 5 mm; the downhole low-speed area accounted for 11.07%, which decreased by 26.19 percentage points; the downhole radial crossflow velocity was 27.93 m/s, which was increased by 61.54%; the annulus rock chip transport velocity was 8.97 m/s, which was increased by 46.57%; the average rock chip retention was reduced by 46.38%, and the average rock chip accumulation was reduced by 59.43%. In conclusion, the chip removal performance of the optimized laser mechanical drill bit has been effectively improved. The research results can provide a data reference for the hydraulic structure design of the laser mechanical drill bit.

Key words: laser mechanical drill bit    EDEM-Fluent coupling    hydraulic structure    downhole flow field    chip removal performance
收稿日期: 2022-08-08 出版日期: 2023-09-04
CLC:  TE 242  
基金资助: 国家自然科学基金资助项目(51974272);四川省科技创新苗子工程项目(2022035)
作者简介: 李 琴(1970—),女,四川江油人,副教授,硕士生导师,硕士,从事深水油气开发及海洋工程关键技术等研究,E-mail: liqin_swpu@163.com,https://orcid.org/0000-0001-9838-2390
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引用本文:

李琴,雷雨薇,孙浩翔,代茂林,陈科. 基于EDEM-Fluent耦合的激光机械钻头井底流场与排屑性能研究[J]. 工程设计学报, 2023, 30(4): 521-530.

Qin LI,Yuwei LEI,Haoxiang SUN,Maolin DAI,Ke CHEN. Study on downhole flow field and chip removal performance of laser mechanical drill bit based on EDEM-Fluent coupling[J]. Chinese Journal of Engineering Design, 2023, 30(4): 521-530.

链接本文:

https://www.zjujournals.com/gcsjxb/CN/10.3785/j.issn.1006-754X.2023.00.047        https://www.zjujournals.com/gcsjxb/CN/Y2023/V30/I4/521

图1  激光机械钻头的EDEM-Fluent耦合流程
图2  激光机械钻头模型和计算流体域模型
图3  不同网格尺寸对应的出口平均流速
图4  激光机械钻头计算流体域模型网格划分
材料参数岩屑钻头
密度/(kg/m3)2 6727 850
泊松比0.20.3
弹性模量/MPa6.5×1032.06×105
表1  岩屑和激光机械钻头的材料参数
接触参数岩屑-岩屑岩屑-钻头
恢复系数0.20.3
静摩擦系数0.560.50
滚动摩擦系数0.010.01
表2  岩屑和激光机械钻头的接触参数
图5  井底上方4 mm处平面的速度云图
图6  井底低速区速度云图
图7  环空区域流线分布图
图8  岩屑分布示意
图9  岩屑数量随时间的变化曲线
图10  激光机械钻头水力结构参数示意
水平因素

流道倾角

α/(°)

流道直径

D/mm

激光通道宽度W/mm
117105
2211510
3252015
表3  激光机械钻头水力结构优化试验因素水平表
试验序号因素评价指标

流道倾角

α/(°)

流道直径

D/mm

激光通道宽度

W/mm

平均岩屑滞留量/

平均岩屑堆积量/

117105225.7568.60
2171515348.67115.67
3172010272.5078.03
4211010283.86115.34
521155226.3972.50
6212015396.29136.66
7251015347.17142.50
8251510345.10141.31
925205274.60102.00
表4  激光机械钻头水力结构优化正交试验方案与结果
参数平均岩屑滞留量平均岩屑堆积量
αDWαDW
K1846.92856.78726.74262.30326.44243.10
K2906.54920.16901.46324.50329.48334.68
K3966.87943.391 092.13385.81316.69394.83
k1282.31285.59242.2587.43108.8181.03
k2302.18306.72300.49108.17109.83111.56
k3322.29314.46364.04128.60105.56131.61
R39.9828.87121.7941.173.2550.58
表5  激光机械钻头水力结构优化正交试验结果极差分析 (颗)
图11  激光机械钻头水力结构参数对平均岩屑滞留量的影响
图12  激光机械钻头水力结构参数对平均岩屑堆积量的影响
图13  优化前后井底低速区速度云图对比(t=0.5 s)
图14  优化前后井底径向漫流速度对比(t=0.5 s)
图15  环空岩屑分布示意
图16  优化前后环空岩屑运移速度对比
图17  优化前后激光机械钻头的排屑性能对比
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