【摘要】 为了增强钻井液在传统振动筛的透筛能力并且尽可能多地回收钻井液，开展了脉冲负压钻井液振动筛的研究。通过对脉冲负压钻井液振动筛进行三维建模，运用计算流体力学数值模拟方法，系统研究了脉冲负压振动筛在三角波、梯形波和正弦波3种变化形式及在2、4、5 Hz这3种频率变化工况下钻井液的流动和透筛规律。研究结果表明：在入口速度为1.8 m/s,负压值以频率为5 Hz的梯形波变化时，钻井液跑浆的风险最低，此时其覆盖率为87.5%,终止线的最大长度为1 787 mm;引入负压系统后，钻井液的透筛速度明显增大，负压段的最大平均透筛速度为0.52 m/s,是常压段最大透筛速度的6.2倍；分离效率在5及4 Hz梯形波条件下达到97.2%。研究结果可为钻井液振动筛的设计和应用带来新的思路。更多还原

【Abstract】 In order to increase the sieving capacity of drilling fluid in traditional shale shaker and recover as much drilling fluid as possible, research was conducted on pulsed negative pressure shale shaker. First, a 3D model of pulsed negative pressure shale shaker was built. Then, the numerical simulation method of computational fluid dynamics(CFD) was used to investigate the flow and sieving patterns of drilling fluid in pulsed negative pressure shale shaker under three forms(triangular wave, trapezoidal wave and sine wave) and three frequencies(2 Hz, 4 Hz and 5 Hz). The study results show that when the inlet velocity is 1.8 m/s and the negative pressure changes in a 5 Hz trapezoidal wave, the risk of drilling fluid leakage is the lowest, with a coverage rate of 87.5% and a maximum length of 1 787 mm at the termination line. When the negative pressure system is introduced, the sieving speed of the drilling fluid significantly increases, the maximum average sieving speed in the negative pressure section is 0.52 m/s, which is 6.2 times the maximum sieving speed in the normal pressure section. The separation efficiency reaches 97.2% under the conditions of 5 and 4 Hz trapezoidal waves. The study results provide new ideas for the design and application of shale shakers.更多还原