PD C水力参数的不同综合表现为井底流场能量的变化。
Different combinations of PDC drilling bits hydraulic parameters are comprehensively reflected by flow field energy transformation at oil well bottoms.
分析了流场的总体特点，得出了喷嘴孔径对PDC钻头井底流场的各种影响。
The overall characteristics of flow field are analyzed and various influences of nozzle diameter on the downhole flow field of PDC bits are obtained.
通过改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素，来研究井底流场的变化。
By changing the nozzle inlet pressure, drill gage width, nozzle diameter factors, to study the changes in these flow fields.
分析认为，该潜孔钻头导致井底流场分布不合理的原因在于喷嘴安放位置太靠近钻头边缘。
Analysis shows that the reason of improper flow field distribution caused by DTH bit is that the nozzle position is close to the edge of bit.
PDC钻头在实钻过程中井底流场非常复杂，而优化其水力学参数是提高钻头钻井能力的有效手段。
The flow field of PDC bits is very complicated during drilling process, while optimizing its hydraulics parameters is an effective method to improve its drilling performance.
通过156口调整井钻井试验，对比分析了刮刀钻头和牙轮钻头的钻进特性、牙齿磨损特性、井底流场特性及钻井效果。
Through drilling experiment in 156 adjustment Wells, the drilling behaviors, cutter wear, downhole jet flow field and drilling effect of drag bits and roller ones were comparatively analyzed.
以一种现场常用的PDC取心钻头为原型，充分考虑排屑槽和切削齿对于井底流动的影响，建立了与实际相接近的PDC取心钻头井底流场的物理模型。
The bottom hole flow physical model of a kind of PDC coring bits is established considering the effect of junk slot and teeth layout in this paper.
针对以上问题设计了一种复锥面异形牙轮单牙轮钻头，为了研究设计的钻头结构是否合理、钻头的井底破岩效果、钻头的井底流场特性等问题，对试验钻头进行了一系列的分析。
To resolve the above problems we have designed a singular one-cone bit. We analyzed the bit to understand the mechanism, the result of breaking the rock, the characters of the fluid field.
针对以上问题设计了一种复锥面异形牙轮单牙轮钻头，为了研究设计的钻头结构是否合理、钻头的井底破岩效果、钻头的井底流场特性等问题，对试验钻头进行了一系列的分析。
To resolve the above problems we have designed a singular one-cone bit. We analyzed the bit to understand the mechanism, the result of breaking the rock, the characters of the fluid field.
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