仿生水草治理海底管道悬空情况探查及改进措施

Investigation on Application of Bionic Aquatic Grass for Treating Subsea Pipeline Suspension and Improvement Measure

胜利埕岛油田于2006年引入了海底仿生水草防冲刷系统进行海底管道悬空治理,试点工程实施后1年,泥沙淤积厚度已达到了20～ 50 cm,但最近发现许多管道再次悬空.文章针对这种情况进行了11处管道立管的悬空探查,其中2006年、2007年治理的有7处,铺设的仿生水草缺失率平均超过50％;2008年治理的有1处,治理效果较好,悬空长度6m,高度0.4 m,治理范围内均发现仿生水草,缺失少；2010年治理的有3处,治理范围内未发现悬空,仿生水草状态良好,管道处于淤积填埋状态.文章分析了管道再次悬空的原因,并据此对悬空治理方案提出了改进措施.

The anti-scouring bionic aquatic grass for treating subsea pipeline suspension problem was introduced and tested in 2006 by Shengli Chengdao Oilfield.After one year of that test project implementation,the thickness of soil filling-up reached 20~50 cm.But recent investigation shows that many pipeline sections suspend again.There were 11 suspension sections near lower parts of vertical pipelines to be investigated.Among them,7 suspension sections were treated in 2006 and 2007 and the average loss of bionic aquatic grass was over 50%; one suspension section having the span of 6 m and the height of 0.4 m and most bionic aquatic grass remaining in the treatment range was treated in 2008 and gained good treatment effect; 3 suspension sections were treated in 2010 and their treatment effects are perfect and no span is found,the bionic aquatic grass is in good condition and the pipeline is in buried condition.This paper analyzes the reasons of pipeline suspension and brings forward the improvement measures for pipeline suspension treatment.