摘要：In horizontal drilling, the cuttings bed is frequently formed to result in severe problems such as backing pressure, binding of bottom hole assembly (BHA) and even sticking of tool. Practice and research show that the smaller particle size is, the more favorable to carry out from bottom of hole in extended reach well or horizontal well. This paper presented a new solution to enhance cuttings transport in mining drilling through a new type of bit called pulsed mill bit (PMB) by using pulse jet mill technique. It provides a promising solution to enhance the efficiencies of rock breaking and cuttings carrying for pulsed jet, sucking cuttings to decrease the chip hold down effect, and reducing cuttings' diameter to eliminate cuttings bed. The design was supported by the calculation models of Helmholtz resonator natural frequency, optimal drilling fluid flow rate of resonator, drilling fluid flow velocity in forward jet channel, critical impact velocity of cuttings and minimum length of the accelerating cavity. Meanwhile, factors affecting optimal drilling fluid flow rate, critical impact velocity of cuttings and minimum length of accelerating cavity were investigated. Case study showed a good consistency between the calculation results and the related theories. It is concluded that optimal drilling fluid flow rate increases with the increase of inlet and outlet cavity's diameter, and decreases with the increase of the diameter of the resonant cavity. Critical impact velocity of cuttings increases with the energy conversion factor () and ROP, while decreasing with the final size of the cuttings (d(t)). This effect is obvious when <0.2, ROP <3.048 m h(-1) and d(t)<0.3 mm. Minimum length of the accelerating cavity decreases with the increase of the resonator's natural frequency and separation coefficient () of drilling fluid flow rate. This study provides a promising solution to remove cuttings bed in horizontal well.

关键字：pulse jet mill technique cuttings bed Helmholtz resonator optimal flow rate critical impact velocity

ISSN号：1674-7321

卷、期、页：卷: 62 期: 5 页: 875-884

发表日期：2019-05-01

影响因子：1.719000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,SCIE（科学引文索引网络版）

发表期刊名称：SCIENCE CHINA-TECHNOLOGICAL SCIENCES

参与作者：Balachandran, Balakumar

通讯作者：刘永升,魏征,谭雷川,谭雷川

第一作者：高德利

论文类型：期刊论文

论文概要：刘永升,高德利,魏征,Balachandran, Balakumar,谭雷川,谭雷川，A new solution to enhance cuttings transport in mining drilling by using pulse jet mill technique，SCIENCE CHINA-TECHNOLOGICAL SCIENCES，2019，卷: 62 期: 5 页: 875-884

论文题目：A new solution to enhance cuttings transport in mining drilling by using pulse jet mill technique