海洋地震多缆拖带方式探讨

Discussions on the Towing Mode of Multi-streamers in Offshore Seismic Survey

金杰 李斌 杨明 杜万兴 李玉剑

JIN Jie LI Bin YANG Ming DU Wanxing LI Yujian

中国石化集团上海海洋石油局第一海洋地质调查大队, 上海 201208

No.1 Marine Geological Investigation Party of Shanghai Offshore Petroleum Bureau, SINOPEC, Shanghai 201208, China

海洋三维地震拖缆作业中,水下电缆的拖带方式决定了前导缆、扩展器、连接绳索间相互受力关系。通过对10缆拖带方式拖带点的受力分析,可以确定当展开器与前导缆的连接绳索(spur line)与工作电缆垂直时的拖带方式,连接绳索受力最小,并且改变前导缆释放长度,可以改变拖带点的弯折角度,从而改变前导缆与连接绳索的受力情况。因此对多缆拖带方式进行模拟优化,可以减小拖带点各连接设备所受到的拉力,从而降低设备损坏率。

The towing mode in offshore seismic survey operations determines the force relationship between lead-in cables, deflectors and the ropes (spur lines) that connect them. Based on the force analysis at the towing points in 10 streamer towing mode, we can identify that the tension on the spur lines between deflectors and lead-ins is lowest when it is vertical to the streamers. Changing the lead-in cable lengths will change the bending angle at the towing points, thus change the force between the lead-in cables and the spur lines. Therefore, the simulation of optimization on the multi-streamer towing mode can reduce the tensions on spur lines and lead-in cables at the towing points, thereby reduce the equipment failure rate.

https://doi.org/10.3969/j.issn.1008-2336.2014.03.095