动态水位作用下管道回拖孔壁的稳定性  

Stability of bore wall under dynamic water level during the backtow of pipeline

作　　者：彭旭[1] 邓莉[1] 夏换[2] 刘厚平[2] 吴益泉[3] 胡坤[1] 艾志久[1] 

机构地区：[1]西南石油大学,四川成都610500 [2]中国石油天然气管道科学研究院,河北廊坊065000 [3]中国石油天然气管道局穿越分公司,河北廊坊065000

出　　处：《油气储运》2014年第1期78-81,共4页Oil & Gas Storage and Transportation

基　　金：中国石油天然气集团公司2011年重点科技项目"油气管道与储运工程建设技术研究";2011B-3303

摘　　要：在水平定向钻管道穿越中,当回拖管道穿越河流时,水位的涨落动态效应形成的极限静水压对管道回拖的安全性影响极大。为分析回拖孔壁附近的地应力分布情况,预测孔壁的稳定性,通过对孔壁附近应力场的分析,结合已有的孔壁稳定性判据,推导出合适的孔壁稳定性判据。采用有限元方法,建立穿越模型,并对模型在动态水位变化下的孔壁稳定性进行数值分析,模拟了当河水处于最高水位且继续变化条件下,孔壁附近应力场的变化情况,由应力结果分析得到了孔壁的稳定性随水位上涨而变差的结论,对于现场施工预测评估具有重要的指导意义。(图8,表1,参12)。In the horizontal directional drilling project of pipeline, when the backtowed pipes cross the river, the limit hydrostatic pressure caused by the fluctuation effect of water level has a vital impact on the safety of backtow. To analyze the distribution of earth stress near the bore wall and predict the stability of bore wall, proper criteria of bore wall stability is derived based on the analysis of stress field around the bore wall and the existing bore wall stability criteria. This paper adopts finite element analysis method to build a crossing model and gives a numerical analysis for the bore wall stability of model under dynamic fluctuation of the water level. The change of stress field near the bore wall is simulated under the situation that the water level continuously fluctuates after it achieves the maximum value. It is concluded that the stability of bore wall becomes poorer when the water level rises, which is of great guiding significance for the prediction and evaluation of field pipeline construction. （8 Figures, 1 Table, 12 References）

关 键 词：有限元 管道回拖 水位变化 孔壁稳定性 

分 类 号：TE832[石油与天然气工程—油气储运工程]