Study on the rock‐breaking effect of water jets generated by self‐rotatory multinozzle drilling bit,Energy Science & Engineering

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Study on the rock‐breaking effect of water jets generated by self‐rotatory multinozzle drilling bit
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-03-11 , DOI: 10.1002/ese3.679
Yanbao Liu ₁ , Quanbin Ba ₁ , Lipeng He _{1,

2} , Kai Shen ₁ , Wei Xiong ₁

Affiliation

Underground radial drilling technique is a novel hydraulic stimulation technology, which is one of the important ways to realize precise, intelligent, and efficient extraction of the gas resources. There are many factors influencing the hole‐forming effect by water jet, such as nozzle arrangement and so on. Recently, the self‐rotatory multinozzle drilling bit is frequently used to improve the rock‐breaking effect of water jets. In this paper, to study the effects of inclination angle of forward nozzles and standoff distance, the ANSYS FLUENT combined with RNG turbulence model was adopted to analyze the multinozzle jets flow field. The results indicate that the components of axial velocity and tangential velocity of forward nozzle jets are different with inclination angles of forward nozzles. Moreover, there exists an optimal standoff distance of multinozzle drilling bit for rock breaking. Besides, the drilling test was conducted using the self‐developed drilling simulation system to investigate the effect of inclination angle, radial angle, standoff distance, and jet pressure on the rock‐breaking effect of water jet. Based on the rotating characteristic of rotary jet, the asymmetric inclined linear nozzle arrangement was proposed for the multinozzle drilling bit. And the results also show that the drilling bit with three forward nozzles has larger rock‐breaking zone in terms of jetted hole diameter. Besides, the depth of jetted hole decreased, while the hole diameter increased with the inclination angle of forward nozzle.

中文翻译：

自旋转多喷嘴钻头产生的水射流的破岩效应研究

地下放射状钻井技术是一种新型的水力增产技术，是实现精确，智能，高效开采天然气资源的重要途径之一。有许多因素会影响水射流形成孔的效果，例如喷嘴布置等。近年来，自旋转多喷嘴钻头经常用于改善喷水器的破岩效果。为了研究前喷嘴倾角和支座距离的影响，采用ANSYS FLUENT结合RNG湍流模型对多喷嘴射流场进行了分析。结果表明，前向喷嘴射流的轴向速度和切向速度分量随前向喷嘴的倾斜角度而不同。此外，对于碎石来说，存在一个多喷嘴钻头的最佳间隔距离。此外，使用自行开发的钻探仿真系统进行了钻探测试，以研究倾角，径向角，支座距离和射流压力对射流破岩效果的影响。根据旋转射流的旋转特性，提出了多喷嘴钻头的非对称倾斜线性喷嘴布置。结果还表明，就射孔直径而言，具有三个前喷嘴的钻头具有较大的破岩区。另外，随着前喷嘴的倾斜角度的增加，喷出孔的深度减小，而孔径增大。使用自行开发的钻探仿真系统进行了钻探测试，以研究倾角，径向角，支座距离和射流压力对喷水器破岩效果的影响。根据旋转射流的旋转特性，提出了多喷嘴钻头的不对称倾斜线性喷嘴布置。结果还表明，就射孔直径而言，具有三个前喷嘴的钻头具有较大的破岩区。另外，随着前喷嘴的倾斜角度的增加，喷出孔的深度减小，而孔径增大。使用自行开发的钻探仿真系统进行了钻探测试，以研究倾角，径向角，支座距离和射流压力对喷水器破岩效果的影响。根据旋转射流的旋转特性，提出了多喷嘴钻头的不对称倾斜线性喷嘴布置。结果还表明，就射孔直径而言，具有三个前喷嘴的钻头具有较大的破岩区。另外，随着前喷嘴的倾斜角度的增加，喷出孔的深度减小，而孔径增大。提出了多喷嘴钻头的非对称倾斜线性喷嘴布置。结果还表明，就射孔直径而言，具有三个前喷嘴的钻头具有较大的破岩区。另外，随着前喷嘴的倾斜角度的增加，喷出孔的深度减小，而孔径增大。提出了多喷嘴钻头的非对称倾斜线性喷嘴布置。结果还表明，就射孔直径而言，具有三个前喷嘴的钻头具有较大的破岩区。另外，随着前喷嘴的倾斜角度的增加，喷出孔的深度减小，而孔径增大。

更新日期：2020-03-11

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