流体机械

2015, v.43;No.513(03) 1-5+16

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多孔射流钻头破岩钻孔规律试验研究
Experimental Study on Rock Breaking and Drilling Laws by Multi-hole Jet Bit

马东军;李根生;牛继磊;廖华林;黄中伟;
MA Dong-jun;LI Gen-sheng;NIU Ji-lei;LIAO Hua-lin;HUANG Zhong-wei;SINOPEC Research Institute of Petroleum Engineering;State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum);China University of Petroleum;

摘要(Abstract):

利用自行研制的射流破岩系统,对淹没和围压条件下多孔射流钻头的破岩钻孔规律进行了试验研究,重点考虑了水力参数(冲蚀时间、射流压力、围压、喷距)和结构参数(孔眼数量和侧向孔眼扩散角)对破岩效果的影响,结果表明:随着冲蚀时间的增加,破岩效果先增加,后趋于平缓;随着射流压力的增大破岩效果随之增大;随着围压的增加破岩效果随之减小;随着喷距的增加破岩效果呈先增大后减小的趋势,存在最优喷距范围;随着孔眼数量的增多,破岩成孔形状越来越圆整;随着侧向孔眼扩散角的增大,破岩效果呈先增大后减小趋势,存在最优扩散角范围。试验结果可为多孔射流钻头水力参数选择和结构参数设计提供依据。
By self-designed jet rock breaking system,the experiments were conducted for multi-hole jet bit under submerged and confining pressure conditions. And the key factors were analyzed with rock breaking effect including erosion time,impact pressure,confining pressure,standoff distance,numbers of nozzle orifices and lateral orifice angle. The results show that with the increase of erosion time,the rock breaking effect increase first and then become constant;the rock breaking effect increase with the increase of jet pressure;with the increase of confining pressure,the rock breaking effect decrease;the rock breaking effect increase first and then decrease with the increase of standoff distance,there is a optimal standoff distance range;with the increase of numbers of nozzle orifices,the shape of the jet drilling hole become more round;with the increase of lateral orifice angle,the rock breaking effect increase first and then decrease,there is a optimal lateral orifice angle range. The results can offer helps for hydraulic parameters selection and structural parameter design of multi-hole jet bit.

关键词(KeyWords): 多孔;射流钻头;破岩;钻孔;规律;试验研究
multi-hole;jet bit;rock breaking;drilling;laws;experimental study

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基金项目(Foundation): 国家重点基础研究发展计划(973)项目(2010CB226700);; 国家科技重大专项专题资助项目(2011ZX05009-005)

作者(Author): 马东军;李根生;牛继磊;廖华林;黄中伟;
MA Dong-jun;LI Gen-sheng;NIU Ji-lei;LIAO Hua-lin;HUANG Zhong-wei;SINOPEC Research Institute of Petroleum Engineering;State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum);China University of Petroleum;

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