页岩气井中水力脉冲空化射流钻井试验研究

为了提高页岩气钻井施工中的机械钻速、缩短钻井周期,在分析水力脉冲空化射流钻井机理及关键技术的基础上,在宣页1井中进行了多井次现场试验,并将试验井段的机械钻速与同井相邻井段进行对比。试验结果表明,在钻进地层相同、相近工况下试验井段比同井相邻井段机械钻速平均提高105.3%;水力脉冲空化射流技术可有效提高页岩气钻井施工的机械钻速。建议进行多区块、多井次现场试验,以验证水力脉冲空化射流技术在页岩气钻井施工中的适应性。

An Experimental Study of Hydraulic Pulse Cavitating Jet Drilling in Shale Gas Well

To improve the rate of penetration(ROP) in shale gas drilling and shorten the drilling cycle,several well-times of field test were conducted in Well 1 of Xuanye,and a comparison between the ROP of experimental well-section and that of neighboring section of the same well was carried out on the basis of analyzing the mechanism of hydraulic pulse cavitating jet drilling and key technologies.The findings show that under the same or similar operating conditions,compared with the ROP of the neighboring section,the average ROP of the experimental section is improved by 105.3%.The hydraulic pulse cavitating jet drilling technology can remarkably improve the ROP of shale gas drilling.It is suggested that the field test of multiple blocks and multiple well-times should be conducted so as to verify the adaptability of the technology in shale gas drilling.