摘要
在深井中采用小井眼钻井技术可以有效降低钻井成本，但也面临着机械钻速低以及水力参数设计困难等问题。为此，将脉冲射流钻井技术与小井眼钻井技术相结合，设计了小井眼水力脉）中射流发生器。通过数值模拟和试验分析了小井眼水力脉冲射流发生器的压耗、脉冲射流频率随排量变化的关系，同时对小井眼水力脉冲工具进行了现场试验。试验结果表明，与采用常规钻井方式的邻井相比，在钻进参数变化不大的情况下，水力脉冲射流钻井方式的机械钻速提高了15％～30％，并且钻井过程中各参数稳定，没有发生井下异常，钻具起出后，小井眼水力脉冲发生器和钻头结构完好，钻头新度在80％以上，可以继续使用。
Slimhole drilling technology can effectively reduce drilling costs in deep well drill, but faces the challenge of low ROP and undesirable hydraulic parameters design. To address the issue, the slimhole hydraulic pulsed jet generator is developed by combining hydraulic pulsed jet and slimhole drilling technology. The effect of displacement on the pressure loss and pulse jet frequency of the slimhole hydraulic pulsed jet generator are deter- mined through numerical simulation and experimental analysis. Field tests have also been conducted on the devel- oped tool. The results showed 15% to 30% increased ROP in test well compared with offset well drilling with con- ventional methods under the similar drilling conditions. The drilling parameters maintains steady during drilling and no abnormalities occur downhole. After tripping out the drill string, the slimhole hydraulic pulsed jet generator and the drill bit structure are intact with the bit new degrees of more than 80%.
出处
《石油机械》
2015年第6期1-5,共5页
China Petroleum Machinery
基金
江苏省科技成果转化项目"油气钻井用水力脉冲空化射流发生装置关键技术研发和产业化开发相关专利实施独占许可与合作"
中国石油大学(北京)科研基金资助(KYJJ2012-02-20)
关键词
小井眼
脉冲射流
机械钻速
数值模拟
水力参数
压耗
破岩能力
slimhole
pulse jet
ROP
numerical simulation
hydraulic parameters
pressure loss
rockbreaking capacity
