Louping well 3 is a ultra-shallow extended reach horizontal test well with medium-short radius, its displacement-TVD ratio equals to 2.
楼平3井是河南油田的一口超浅层中短半径大位移水平井试验井，不但位垂比达2。
The extended reach well has such characteristics as large horizontal displacement, great deviation Angle and long open hole interval.
大位移井具有长水平位移、大井斜角以及长裸眼段的特点。
Causes of casing wear and its effects on casing strength in drilling operations of deep well, ultra-deep well, extended reach well and horizontal well are analyzed in this paper.
分析了在深井、超深井、大位移井和水平井钻井施工中套管磨损的原因及对套管强度的影响。
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