摘要
影响钻头性能的因素主要有切削齿结构设计、切削齿技术,水力因素是对钻头性能有显著影响的因素。文章利用计算流体动力学(CFD)技术,通过分析PDC钻头各流道的流量分配、井底速度与压力分布、各刀翼近剖面的漩涡等情况,使钻头水力部分的设计更为合理,从而改善钻头性能。到目前,还没有一个合适的评价PDC钻头水力结构和井底流场优劣的标准,文中根据地层岩石可钻性与岩屑生成机理的不同,分别针对软硬地层,就钻头水力结构优化设计准则给出了一个初步定性的评判标准,为今后PDC钻头水力结构优化提供一定的依据。
The main factors of affecting the performance of drill bits are cutting tooth structure design and cutting-tooth technology. Another factor is the hydraulic performance, it has a significant influence on bit capability. In this paper, by analyzing the flow distribution of the flow channel, bottom velocity and pressure distribution and the swirl near the blade of PDC bit and using the computational fluid dynamics (CFD) technology, the design of hydraulic part of bits was more reasonable and the performance of bit was improved. At the same time, there was no appropriate standard to estimate waterpower structure and the bottom-hole fluid field of the PDC bit. According to the difference of drillability and formation mechanism of rock and debris, a primary evaluation standard of bit hydraulic structure design was given, it provided basis for optimizing the PDC bit waterpower structure in the future.
出处
《钻采工艺》
CAS
北大核心
2013年第3期74-77,9,共4页
Drilling & Production Technology
