改善井底流场能够提高钻速

自从喷射钻井技术广泛应用以来，人们一直在研究如何充分利用喷射钻头在井底获得的岑力功率，，以获得更好的钻井经济效益。本文介绍了喷射钻头井底流场液流流向、井底排屑量和井底液流压力的试验研究方法及其应用。研究表明，由于井底流场的不完善而形成的涡旋、回流和滞流区是造成岩屑在井底重复破碎，影响井底净化效率的重要因素，改善喷射钻头的井底流场，最大限度地减少这些因素的影响，能够更好地发掘喷射钻井技术的潜力，提高钻井速度，降低钻井成本。

IMPROVING THE BOTTOM HOLE FLOW FIELD WILL INCREASE ROP OF JET DUILLING

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.