论文摘要
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（β） and ROP, while decreasing with the final size of the cuttings（dt）. This effect is obvious when β<0.2, ROP<3.048 mh-1 and dt<0.3 mm. Minimum length of the accelerating cavity decreases with the increase of the resonator’s natural frequency and separation coefficient（α） of drilling fluid flow rate. This study provides a promising solution to remove cuttings bed in horizontal well.
论文目录
文章来源
类型: 期刊论文
作者: LIU YongSheng,GAO DeLi,WEI Zheng,BALACHANDRAN Balakumar,WANG ZhenQuan,TAN LeiChuan
来源: Science China(Technological Sciences) 2019年05期
年度: 2019
分类: 工程科技Ⅱ辑,工程科技Ⅰ辑
专业: 石油天然气工业
单位: MOE Key Laboratory of Petroleum Engineering, China University of Petroleum,Department of Mechanical Engineering, University of Maryland, College Park
基金: supported by the National Natural Science Foundation of China(Grant Nos.U1762214 and 51521063),the National Science and Technology Major Projects(Grant Nos.2017ZX05009-003,2017ZX05005-005-007),the National Key Research and Development Program of China(Grant No.2016YFC0303303),the support from the China Scholarship Council
分类号: TE24
页码: 875-884
总页数: 10
文件大小: 1342K
下载量: 45