利用水力脉冲空化射流复合钻井技术提高钻速

水力脉冲空化射流复合钻井技术是指在复合钻井过程中将水力脉冲空化射流发生器安装于钻头与螺杆钻具之间的一种新组合钻井方式,可以综合利用机械能量及水力能量来提高钻速。水力脉冲空化射流复合钻井的提速机理是：将常规复合钻井的高转速破岩与水力脉冲空化射流的有效清岩相结合，从而提高钻速。分析了在新疆英买、轮南区块4口井水力脉冲空化射流复合钻井的现场试验，结果表明水力脉冲空化射流复合钻井比常规复合钻井钻速平均提高12.67%，比常规钻具结构钻井钻速提高26.2%～55.36%，该技术具有较大的推广应用价值。

Improvement of penetration rate with hydraulic pulsating-cavitation jet compound drilling technology

Hydraulic pulsating-cavitation jet compound drilling is a new drilling technology and makes full use of mechanic energy and hydraulic to improve penetration rate. The pulsating-cavitation jet generator is located between bit and screw drilling string. The mechanism of the new drilling technology relies on the combination of high rotating speed of the conventional compound drilling and effectively bottom clearing of the pulsating-cavitation jet to improve the penetration rate. Field experiments in 4 boreholes of Yingmai and Lunnan districts demonstrated that the hydraulic pulsating-cavitation jet compound drilling could improve the penetration rate by 12.67 percent more than the conventional compound drilling and by 26.2～55.36 percent more than the conventional string drilling. This technology is valuable for popularizing in drilling engineering.