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为充分利用井底水力能量提高破岩钻井效率,提出了环空流体吸入式自激振荡脉冲射流钻井技术。将数值模拟和试验研究相结合,分析了环空流体吸入式自激振荡脉冲射流调制元件结构参数的变化对射流破岩性能的影响。对比分析了调制元件的环空吸入量、出口流速、振荡腔负压值和进出口压差与射流破岩效果之间的关系,结果发现调制元件进出口的压差越大,射流破岩效果越好,二者呈显著线性相关。以调制元件进出口压差为优选依据,采用正交试验法,进行了数值模拟试验,优选了调制元件的结构参数,数值计算与试验结果吻合良好,表明分析环空流体吸入式自激振荡脉冲射流性能,优选调制元件结构的方法可行。所得结论可作为射流调制元件结构设计和优化的依据。
In order to make full use of the bottomhole hydraulic energy to improve the rock breaking drilling efficiency, an annular fluid self-oscillating pulse jet drilling technology was proposed. The numerical simulation and experimental study are combined to analyze the influence of the structural parameter variation of annular self-oscillating pulsed jet modulating device on the jet rock breaking performance. The relationship between annular suction, outlet flow rate, negative pressure of oscillating chamber, pressure difference between inlet and outlet and rock breaking effect of jet was analyzed and compared. The results showed that the larger the pressure difference between inlet and outlet of the modulating element, The better, the two were significantly linearly related. In order to optimize the differential pressure between the inlet and the outlet of the modulating element, the numerical simulation experiment was carried out by using the orthogonal test method. The structural parameters of the modulating element were optimized. The numerical calculation was in good agreement with the experimental results. Jet performance, preferably a method of modulating the cell structure, is feasible. The conclusions obtained can be used as the basis for the design and optimization of the structure of the jet modulating element.