Abstract: In view of the wall slip phenomenon of water based micro foam drilling fluids，this paper develops a rheological property correction method considering the wall slip effect. The six-speed rotary viscometer was used to test the rheological properties of the drilling fluid system under different internal-external cylinder clearance conditions and Tikhonov regularization method was used to correct the experimental data to finally obtain the flow curve and slip velocity of water based micro foam drilling fluids，considering the wall slip effect. Comparison of the pre- and post- correction experimental results shows that when the shear stress exceeds a certain threshold，the slip velocity，no longer close to zero，grows with the further increase of the shear stress，and it is considered that wall slip occurs. Considerable differences are observed between the rheological parameters based on API and proposed methods—a minor difference is found in τ y ，and yet the K value declines and n value grows greatly after correction. It is indicated that the API method can accurately calculate the yield stress of water based micro foam drilling fluid，while the calculation of the n and K values shall incorporate the wall slip effect.

Key words: water based micro foam, drilling fluid, wall slip, slip velocity, regularization

摘要： 针对水基微泡沫钻井液壁面滑移现象，提出了一种考虑壁面滑移的水基微泡沫钻井液流变性能校正方法。采用六速旋转黏度计，对不同内外筒间隙条件下微泡沫钻井液的流变性能进行测试，再利用 Tikhonov正则法校正实验数据，得到考虑壁面滑移效应的水基微泡沫钻井液流变曲线和滑移速度。结果表明，当剪切应力大于某一个临界值后，滑移速度不为零，且随着剪切应力的增大而增大，此时则认为发生了壁面滑移；采用文章中讨论的方法和 API方法得到的流变参数之间有显著差异，滑移校正前后 τ _y 变化较小，但 K值在校正后显著减小，而 n值在校正后显著增大，表明 API方法对水基微泡沫钻井液屈服值的计算较准确，但对微泡沫钻井液n、K值的计算应考虑壁面滑移的影响。

关键词: 水基微泡沫, 钻井液, 壁面滑移, 滑移速度, 正则化