负压脉冲射流辅助钻井技术研究

发布时间：2018-06-08 16:21

  本文选题：负压脉冲射流 + 喷嘴　； 参考：《东北石油大学》2017年硕士论文

【摘要】：井底负压脉冲的多个参数对钻头的钻进有着不同程度的影响,本文着重研究这些参数对钻头钻进的影响效果,为改进钻井工艺提供参考。根据射流通道和内部流体的特点,以不稳定热传导关系方程为研究基础,使用计算机语言Matlab进行模拟运算,模拟运算出钻头钻进不同地层过程中包裹岩层与负压脉冲传播特点间的影响关系。设定钻井负压延续时间为一个毫秒,研究表明在此范围内,脉冲三角波在井下持续的负压值比脉冲方形波持续的同类值要小,这一关系说明脉冲方形波能够促进钻井的效率,基于此关系对各区间的参数值进行筛选,波动频率区间为55~105Hz,持续时间区间为1.5~2.5ms的脉冲波有较好的进尺效果。采用改变调制器外面通道形态和喷嘴通道形态,选取恒定的喷嘴出口直径设计实验,深入研究对钻井效果的影响。实验结果显示:随着锥形喷嘴缩口的增大,负压脉冲值的损失增加;随着梯形喷嘴进出端口直径比值的增加,负压脉冲值损失减小。在上述研究的基础上,进行负压脉冲射流辅助钻井实验模拟。实验模拟结果显示:负压脉冲辅助钻井速度随着井底围压的升高先升后降;随着脉冲负压值的增加而增大;这些影响都可以大幅度的提升钻井效率,其技术应用前景不可估量。
[Abstract]:Several parameters of bottom hole negative pressure pulse have different effects on bit drilling. This paper focuses on the effect of these parameters on bit drilling, which provides a reference for improving drilling technology. According to the characteristics of the jet channel and internal fluid, based on the unstable heat conduction equation, the computer language Matlab is used to carry out the simulation operation. The relationship between the characteristics of negative pressure pulse propagation and the surrounding rock formation during bit drilling in different formations is simulated and calculated. The negative pressure duration of drilling is set as one millisecond. The research shows that in this range, the negative pressure of the pulse triangle wave is smaller than the same value of the pulse square wave. This relationship shows that the pulse square wave can promote the drilling efficiency. Based on this relation, the parameter values of each interval are screened. The pulse wave with a wave frequency interval of 55 ~ 105Hz and a duration interval of 1.5~2.5ms has a good scaling effect. By changing the outside channel shape and nozzle channel shape of modulator and selecting constant nozzle outlet diameter design experiment, the effect on drilling effect is deeply studied. The experimental results show that the loss of negative pressure pulse increases with the increase of conical nozzle shrinkage, and decreases with the increase of the ratio of inlet and outlet diameter of trapezoidal nozzle. On the basis of the above research, the experimental simulation of negative pressure pulse jet assisted drilling is carried out. The experimental results show that the velocity of negative pressure pulse assisted drilling rises first and then decreases with the increase of bottom hole confining pressure, and increases with the increase of pulse negative pressure. These effects can greatly improve the drilling efficiency, and the technical application prospect is inestimable.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE242
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本文编号：1996424