This paper adopts the fourth theory of strength to decide the maximum depth of tubing pump. A better effectiveness is attained through applying the method in Wenliu Oilfield.
文章采用第四强度理论来确定最大下泵深度，并在文留油田的应用中取得了较好的效果。
And use the fourth strength theory, the axial tension in the coiled tubing under the influence of internal and external pressure from a comprehensive stress of checking.
并利用第四强度理论，对连续油管在轴向拉力与内外压力的作用下的综合应力进行了校核。
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