Abstract:

Since jet drilling found wide application, continuous research has been carried out as to fully utilizing the bit hydraulic power at the bottom hole. This paper deals with the experimental study technique and the application of fluid flow direction in the flow field. The imperfect flow patterns of vortex, backflow and stagnation are found to be the main factors affecting the bottom hole scavenging efficiency.
Improving the bottom hole flow field of a jet bit will increase the rate of penetration and reduce the cost of jet drilling.