Study on downhole flow field and chip removal performance of laser mechanical drill bit based on EDEM-Fluent coupling

doi:10.3785/j.issn.1006-754X.2023.00.047

Chin J Eng Design

2023, Vol. 30

Issue (4): 521-530 DOI: 10.3785/j.issn.1006-754X.2023.00.047

Mechanical Optimization Design

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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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

Received: 08 August 2022 Published: 04 September 2023

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	Qin LI
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Cite this article:

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. Chin J Eng Design, 2023, 30(4): 521-530.

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

基于EDEM-Fluent耦合的激光机械钻头井底流场与排屑性能研究

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

Fig.1 EDEM-Fluent coupling flow of laser mechanical drill bit

Fig.2 Laser mechanical drill bit model and computational fluid domain model

Fig.3 Average outlet flow rate for different grid sizes

Fig.4 Grid division of computational fluid domain model for laser mechanical drill bit

Table 1 Material parameters of rock chip and laser mechanical drill bit

Table 2 Contact parameters of rock chip and laser mechanical drill bit

Fig.5 Velocity cloud map of cross-section at 4 mm above downhole

Fig.6 Velocity cloud map of downhole low-speed zone

Fig.7 Streamline distribution diagram of annulus region

Fig.8 Schematic diagram of rock chip distribution

Fig.9 Variation curve of rock chip quantity over time

Fig.10 Schematic diagram of hydraulic structure parameters of laser mechanical drill bit

Table 3 Factor level table for hydraulic structure optimization test of laser mechanical drill bit

Table 4 Orthogonal test schemes and results for hydraulic structure optimization of laser mechanical drill bit

参数	平均岩屑滞留量			平均岩屑堆积量
参数	α	D	W	α	D	W
$K 1$	846.92	856.78	726.74	262.30	326.44	243.10
$K 2$	906.54	920.16	901.46	324.50	329.48	334.68
$K 3$	966.87	943.39	1 092.13	385.81	316.69	394.83
$k 1$	282.31	285.59	242.25	87.43	108.81	81.03
$k 2$	302.18	306.72	300.49	108.17	109.83	111.56
$k 3$	322.29	314.46	364.04	128.60	105.56	131.61
$R$	39.98	28.87	121.79	41.17	3.25	50.58

Table 5 Range analysis of orthogonal test results for hydraulic structure optimization of laser mechanical drill bit

Fig.11 Influence of hydraulic structural parameters of laser mechanical drill bit on average rock chip retention

Fig.12 Influence of hydraulic structural parameters of laser mechanical drill bit on average rock chip accumulation

Fig.13 Comparison of velocity cloud map of downhole low-speed zone before and after optimization (t=0.5 s)

Fig.14 Comparison of downhole radial crossflow velocity before and after optimization （t=0.5 s）

Fig.15 Schematic diagram of annulus rock chip distribution

Fig.16 Comparison of annulus rock chip transport velocity before and after optimization

Fig.17 Comparison of chip removal performance of laser mechanical drill bit before and after optimization


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