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为了充分利用井底水力能量提高钻速,提出了井下调制簧阀阻断式脉冲磨料射流钻井技术。模拟分析了簧阀阻断式脉冲磨料射流钻井工具的内部流场,确认了采用簧阀阻断式机构调制脉冲射流的原理可行。研制了簧阀阻断式脉冲磨料射流的原理样机,纯水射流的试验测试结果表明,簧阀阻断式脉冲射流破岩性能明显优于连续射流;基于正交试验法,优选确定了原理样机的结构参数,进而引入磨料,调制形成脉冲磨料射流。脉冲磨料射流破岩试验结果表明,岩石破碎孔的深度随着泵压增大而增大,而随着磨料浓度和喷距的增大,则先增大后逐渐减小,存在最优值。研究结果证实了井下调制簧阀阻断式脉冲磨料射流钻井方法的原理可行,可为实际技术发展提供依据。
In order to make full use of the bottom hole hydraulic energy to increase the drilling speed, a downhole modulated reed-pulse jet abrasive drilling technology was proposed. The internal flow field of the reed-valve pulse-jet abrasive tool was simulated and analyzed, and the principle of using the reed valve-blocking mechanism to modulate the pulse jet was confirmed. The principle prototype of the reed-impulse pulsed abrasive jet was developed. The test results of the pure water jet show that the reed-breaking pulse jet has better rock breaking performance than the continuous jet. Based on the orthogonal test, the principle prototype The structural parameters, and then the introduction of abrasive, modulated pulse abrasive jet formation. The results of rock burst tests on pulsed abrasive jet show that the depth of rock fracture increases with the increase of pump pressure, and increases with the increasing of abrasive concentration and jet distance, and then decreases gradually with the optimal value. The results of the study confirm that the principle of downhole modulated reed valve impulse jet abrasive drilling method is feasible and can provide basis for practical technical development.