一种新型结构石油射孔弹的数值模拟研究

发布时间：2018-04-12 17:45

本文选题：石油射孔弹 + AUTODYN　；参考：《中北大学》2015年硕士论文

【摘要】：射孔完井是目前石油开采的主要完井方式，将聚能射孔技术应用到石油开采中有着极高的技术要求。因此，聚能石油射孔弹不仅要有足够的穿深，而且穿孔后不能有杵堵现象，为了使穿孔畅通，通油率高，则要求穿孔直径应当足够大。传统铜药型罩射孔弹杵堵现象十分严重，为了消除杵堵，本论文提出一种射孔弹结构上的改进方式，使其穿孔达到无杵堵、大孔径和高穿深的要求。本文在查阅国内外相关文献的基础上，设计了一种增加挡板的新型结构石油射孔弹，利用ANSYS/AUTODYN-2D有限元程序与传统石油射孔弹装药结构进行对比，并对不同因素对射流成型影响及挡板对杵体阻挡的过程进行了数值模拟，分析了石油射孔弹药型罩壁厚、锥角、挡板材料、挡板厚度以及挡板开孔孔径对射流形成和对杵体的阻挡程度进行影响分析。在此基础上，通过正交优化设计的方法对射流速度在不同因素水平组合下进行方案设计，并进行数值模拟计算，然后通过数据处理得出各因素的主次关系以及最优参数组合，，以射流头部速度为考察指标，最终选取射流较细、无杵堵情况，有较高穿深的最优解。研究表明：（1）含挡板的新型结构石油射孔弹与传统结构石油射孔弹相比，可以有效的切割阻挡射流杵体，这样可以减小杵堵现象发生的概率；（2）挡板结构设计中，挡板的孔径大小直接决定形成射流的形状和稳定性；（3）对于挡板材料的选取，由于形成高温射流，挡板应选熔点比较高的材料，通过对计算结果分析比较，最终选取钨作为挡板材料；（3）应用正交优化的方法针对四种影响因素对新型石油射孔弹形成射流速度的主次关系进行了分析研究。从而确定最终选择药型罩锥角为60°、药型罩壁厚1.0mm、挡板开孔孔径22mm、挡板厚度为5mm的方案为最优解；（4）通过对新型石油射孔弹优化后的结构方案进行侵彻混凝土靶板时，可以发现添加的挡板可以很明显的截断杵体，减小杵体对出油孔堵塞，且对有效射流的影响较小。
[Abstract]:Perforation completion is the main completion method for oil production at present. It has high technical requirements to apply the shaped energy perforation technology to oil production.Therefore, there should not only be enough penetration depth, but also no pestle plugging after perforation. In order to make the perforation smooth and the oil rate high, the perforation diameter should be large enough.The phenomenon of pestle plugging of traditional copper cartridge cartridge is very serious. In order to eliminate pestle blockage, this paper puts forward an improved method of perforating projectile structure, which can make perforation reach the requirements of no pestle, large aperture and high penetration depth.In this paper, a new type of petroleum perforating projectile with additional baffles is designed on the basis of consulting the relevant literature at home and abroad. The ANSYS/AUTODYN-2D finite element program is used to compare the charge structure of the traditional petroleum perforating projectile with that of the traditional one.The influence of different factors on jet forming and the process of baffle blocking to pestle body were simulated. The wall thickness, cone angle and baffle material of petroleum perforated ammunition cover were analyzed.The influence of baffle thickness and aperture of baffle on jet formation and barrier degree to pestle was analyzed.On this basis, the scheme of jet velocity is designed by orthogonal optimal design method under different factors and horizontal combination, and the numerical simulation is carried out, and then the primary and secondary relationships of each factor and the optimal parameter combination are obtained by data processing.Taking the velocity of the jet head as the index, the optimal solution with higher penetration depth and finer jet with no pestle plugging is selected.The research shows that a new type of petroleum perforating projectile with baffle can cut the jet effectively compared with the traditional one, which can reduce the probability of the phenomenon of pestle blockage in the design of the baffle structure.The diameter of the baffle determines the shape and stability of the jet directly) for the selection of the baffle material, due to the formation of high temperature jet, the material with higher melting point should be selected for the baffle, and the calculated results are analyzed and compared.Finally, tungsten is selected as the baffle material. The orthogonal optimization method is used to analyze the primary and secondary relationship of jet velocity of new petroleum perforating projectile by four factors.It is determined that the final conical angle is 60 掳, the wall thickness is 1.0 mm, the aperture of the baffle is 22mm, and the thickness of the baffle is 5mm. When the optimized structure of the new type of petroleum perforating projectile is penetrated into the concrete target plate,It can be found that the added baffle can obviously truncate the pestle body, reduce the plugging of the oil hole and have little effect on the effective jet.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE257.1

【参考文献】