考虑浅层地质灾害的钻井船就位研究

Research on positioning of drilling ship considering shallow geological disasters

渤海湾L油田平台位置场址范围内的工程物探调查表明,该区域海底及海底以下发育浅层气及古河道。为了保证钻井船就位安全,针对平台位置优选问题,基于“总水平位移和总进尺最少”的原则初步优选平台位置,并开展了平台位置分别向西南、西、西北和南方向移动的最优位置优选研究;针对钻井船选型问题,基于渤海湾常用钻井船桩靴重合处的土质取样,开展了桩靴尖入泥深度分析研究。结果表明,初选平台位置向西移动100 m时,钻井综合进尺与距浅层气距离最优;HYSY92系列及N_(1)钻井平台就位时不存在穿刺风险,可推荐为就位钻井船。该成果认识对于类似具有浅层地质灾害的油田具有一定的参考价值。

The engineering geophysical survey in the location of L oilfield platform in Bohai Bay shows that shallow gas and ancient river channel are developed in this area.In order to ensure the safety of the drilling ship in place,aiming at the optimization of the platform position,the platform position is preliminarily optimized based on the principle of“the least total horizontal displacement and total footage”.And the optimal location of the platform moving to southwest,west,northwest and south is studied;In view of the problem of drilling ship selection,based on the soil sampling at the joint of pile shoes of common drilling ships in Bohai Bay,the analysis and research on the depth of pile shoe tip into mud are carried out.The results show that the comprehensive drilling footage and the distance from shallow gas are the best when the primary platform moves 100 m to the west;HYSY92 series and N_(1) drilling platforms have no puncture risk when they are in place,which can be recommended as in place drilling ships.This result has certain reference value for similar oilfields with shallow geological disasters.