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工程设计学报
Chin J Eng Design  2022, Vol. 29 Issue (3): 384-393    DOI: 10.3785/j.issn.1006-754X.2022.00.044
Modeling, Simulation, Analysis and Decision     
Research on internal flow field law of mechanical automatic vertical drilling tool actuator
Chao-qun MA1,2(),Kai ZHANG1,2(),Lin CHAI1,2,Bao-lin LIU1,2,Qin ZHOU1,2
1.School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
2.Key Laboratory of Deep GeoDrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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Abstract  

In scientific drilling, the automatic vertical drilling technology can effectively control well deviation. However, the actuator of existing mechanical automatic vertical drilling tool needs a pump with large displacement to provide power. If the displacement is to be reduced, the internal structure of the actuator is required to have a good pressure maintaining effect. In order to solve the above problem, a new actuator with discharge gaps inside was proposed to improve its pressure retention performance, and the streamline distribution in its internal fluid zone was simulated by using the CFD (computational fluid dynamics) method to analyze the influence of discharge gaps on the pressure in the fluid zone, so as to verify the feasibility of using the gap discharge to achieve pressure retention; at the same time, through the sensitivity analysis of parameters such as the width and length of the discharge gap, the influence of different parameters on the pressure retention effect of the new actuator was obtained. The results showed that under the condition of small pump displacement, the new actuator still had good pressure retention effect, and the most obvious factor affecting the pressure retention effect was the discharge gap width; when the discharge gap width was less than 0.2 mm, the overall pressure of fluid zone in this actuator was small, that was, its pressure retention effect was good. It can be seen that the performance optimization of the actuator can be realized by setting up the discharge gap, which is of great significance to further improve the inclination correction ability of the mechanical automatic vertical drilling tool.

Key words： automatic vertical drilling tool      discharge gap      internal flow field      law analysis     
Received: 03 September 2021      Published: 05 July 2022
CLC:  TH 128  
Corresponding Authors: Kai ZHANG     E-mail: 804771505@qq.com;zhangkai66@cugb.edu.cn
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Chao-qun MA
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Cite this article:

Chao-qun MA,Kai ZHANG,Lin CHAI,Bao-lin LIU,Qin ZHOU. Research on internal flow field law of mechanical automatic vertical drilling tool actuator. Chin J Eng Design, 2022, 29(3): 384-393.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2022.00.044     OR     https://www.zjujournals.com/gcsjxb/Y2022/V29/I3/384


机械式自动垂直钻具执行机构内部流场规律研究

在科学钻探中，利用自动垂直钻井技术能够有效控制井斜。但是，现有机械式自动垂直钻具的执行机构需要较大排量的泵机来提供动力。若要降低排量，则要求执行机构的内部结构有良好的保压效果。为解决上述问题，提出一种内部带有泄流缝隙的新型执行机构，以提升其保压性能，并利用CFD（computational fluid dynamics，计算流体动力学）方法对其内部流体区域的流线分布进行模拟，分析泄流缝隙对流体区域压强产生的影响，以验证利用缝隙泄流实现保压的可行性；同时，通过对泄流缝隙宽度、长度等参数的敏感性分析，得到不同参数对新型执行机构保压效果的影响。结果表明，在泵机排量较小的条件下，新型执行机构仍具有良好的保压效果，对保压效果影响最明显的因素为泄流缝隙宽度；当泄流缝隙宽度小于0.2 mm时，该执行机构内部流体区域的整体压强较大，即其保压效果良好。由此可知，开设泄流缝隙可实现执行机构的性能优化，这对进一步提升机械式自动垂直钻具的纠斜能力具有重要意义。


关键词： 自动垂直钻具,  泄流缝隙,  内部流场,  规律分析 
Fig.1 Structure diagram of mechanical automatic vertical drilling tool
Fig.2 Inclination correction principle of mechanical automatic vertical drilling tool
Fig.3 Structural profile of new actuator
Fig.4 Naming of critical plam surface and its corresponding actuator housing surface
Fig.5 Schematic diagram of working principle of new actuator
Fig.6 Schematic diagram of fluid zone in new actuator
Fig.7 Dimensional parameter setting for three-dimensional model of fluid zone in new actuator
Fig.8 Schematic diagram of palm opening angle
Fig.9 Variation curve of average pressure of fluid zone with palm opening angle
Fig.10 Comparison of flow field streamlines of fluid zone under different palm opening angles
Fig.11 Pressure nephogram of fluid zone with palm fully opened
Fig.12 Variation curve of average pressure of fluid zone with palm fully opened
Fig.13 Variation curve of average pressure of fluid zone with inlet diameter
Fig.14 Schematic diagram of inlet angle of fluid zone
Fig.15 Variation curve of average pressure of fluid zone with inlet angle
Fig.16 Variation curve of average pressure of fluid zone with discharge gap width
Fig.17 Schematic diagram of discharge gap length
Fig.18 Variation curve of averge pressure of fluid zone with discharge gap length
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