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H V F J lpr  &(uukh8h8CJo(h8B*CJo(phh:h@5CJo(h) 5CJo(U h4aJo( h8aJo(!jh:5CJUmHnHu h) CJo( h8CJ hCJo(h85CJo(hb5CJo( h{X@CJo(h8CJH*o( h8CJo(hvh575CJo(& lr|r $d,22a$$d,22@&a$gd4$d,22WD`a$gd) d 22WD`gd57d 22WD`gd57d 22WD`gd57$d 22@&a$gd4V1 e=0.4 v=0.1m/svvfLub V2 e=0.4 v=0.2m/svvfLub & & 50~ (W N TAm`0 N TAmRpeT N Tszzeϑ~OP_^vagN NۏLN{ _0RN^SOP_^I{[vfHesNSLub3z['`vq_Tĉ_ (1) Џ(upe\ O4llFmvflFmvz)RۏL0 (4) Lub1Y3zvQ(WSV/ftT^R^v NGWS'` bv0OP_Svf^q_TtT^R^ N q_TLub3z['`SszzvfHes0 S  e .s [1] R.H. Mclean, et al. Displacement Mechanics in Primary Cementing[J] . Journal of Petroleum Technology , February 1967251-260. [2] Christopher F. Lockyear and Danlel F.Ryan et al. Cement Channeling: How to Predict and Prevent[J] . SPE Drilling Engineering, September 1990201-208. [3] R]^I{. llNl4lltN^(u[M] . SNwl]NQHr>y 2000.8295-307. [4] ѐ8lR. 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