就位抛砂对CB151井场及坐底式采油平台基础沉降的影响

由于埕岛油田近岸区井场地质条件复杂 ,要求坐底式平台每一次就位作业时 ,必须进行抛砂平整 ,从而导致地层土力学性质变化 ,并对下一次坐底式平台安全就位产生影响。以 CB1 5 1井场的典型资料为例 ,介绍了近岸海域井场的一般地形、地貌特征及工程地质条件差异 ,通过对坐底式平台基础沉降的分析 ,计算了坐底区、抛砂区、正常 (自然 )区 3种类型海底在外界因素作用下可能发生的沉陷量 ,总结了该类井场的一般特点 ,并对今后的坐底式平台就位作业提出了措施与建议

INFLUENCE OF SAND DUMPING DURING PLATFORM EMPLACEMENT ON CB151 WELLSITE AND BOTTOM-SUPPORTED PLATFORM FOUNDATION SETTLEMENT

Because the wellsite conditions in the Chengdao oil field inshore area are complex, the sand dumping for site leveling during each bottom supported platform emplacement is required, which results in the changes in the geotechnical property to bring about influences on the next platform emplacement. Taking the typical data of the CB151 wellsite as an example, the differences in topography, geomorphological features and engineering geological condition of wellsite in the inshore area are introduced, and the possible settlement values for 3 types of seabed (platform seated area, sand dumping area and normal area) under the actions of external factors are computed. Finally, the general features of this kind of wellsite are summarized, and the measures and suggestions for the bottom supported platform explacement operations in future are proposed.