深水钻井表层导管喷射下入井口稳定性分析
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摘要
表层导管喷射下入技术可在水力喷射钻进的同时安装表层导管,解决了深水表层钻孔后下表层导管不易找到井口的难题,并且一趟管柱作业完成了两开井眼的钻进。但对于深水钻井作业来说,在表层导管下入时,由于风浪流作用,随着下入深度的增加,平台与表层套管之间有很大的偏移,对作业造成很大风险。基于Ansys有限元分析软件建立并应用了深水钻井表层导管喷射下入导管强度校核和水下井口稳定性分析模型,分别对井口无倾斜,倾斜不同角度时水下井口第1根表层导管等效应力进行了校核,得出在安全作业基础下平台的最大偏移量。研究成果为实际提供做出了技术经验和指导。
By virtue of the jetting based surface conductor setting technology, the surface conductor can be set in the process of jetting, so the difficulty that the wellhead cannot be found easily when the surface conductor is lowered after the deepwater surface drilling is solved and the drilling of two sections is completed in one trip of string operation. As for deepwater drilling operations, however, when the surface conductor is lowered, there is a large offset between the platform and the surface casing with the increase of the lowering depth due to the influence of wind and waves, which brings about a great risk to the operation. A conductor strength check and underwater wellhead stability analysis model for the jetting based surface casing setting of deepwater drilling was established based on the Ansysfinite element analysis software. Then, it was applied to check the equivalent stress of the first surface casing at the underwater wellhead with no inclination and different inclination angles. And accordingly, the maximum offset of the platform based on the prerequisite of safe operation was obtained. The research results could be used as the guidance for actual engineering.
By virtue of the jetting based surface conductor setting technology, the surface conductor can be set in the process of jetting, so the difficulty that the wellhead cannot be found easily when the surface conductor is lowered after the deepwater surface drilling is solved and the drilling of two sections is completed in one trip of string operation. As for deepwater drilling operations, however, when the surface conductor is lowered, there is a large offset between the platform and the surface casing with the increase of the lowering depth due to the influence of wind and waves, which brings about a great risk to the operation. A conductor strength check and underwater wellhead stability analysis model for the jetting based surface casing setting of deepwater drilling was established based on the Ansysfinite element analysis software. Then, it was applied to check the equivalent stress of the first surface casing at the underwater wellhead with no inclination and different inclination angles. And accordingly, the maximum offset of the platform based on the prerequisite of safe operation was obtained. The research results could be used as the guidance for actual engineering.
引文
[1]张洪波,周波,王志.海上隔水导管接头类型及特性分析[J].科技创新导报,2013(7):38-40.
[2]张洪坤,孙宝江,徐爽,等.深水喷射下导管射流破土数值模拟及试验验证[J].石油机械,2016,44(4):33-37,41.
[3]顾纯巍,张勇,郭永宾,等.接箍对海上隔水导管打桩的影响[J].断块油气田,2013,20(4):543-544.
[2]张洪坤,孙宝江,徐爽,等.深水喷射下导管射流破土数值模拟及试验验证[J].石油机械,2016,44(4):33-37,41.
[3]顾纯巍,张勇,郭永宾,等.接箍对海上隔水导管打桩的影响[J].断块油气田,2013,20(4):543-544.