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海洋地震拖缆是海洋油气资源勘探中的重要设备,为研究海洋地震拖缆在拖曳状态以及有横向干扰时的阻力特性,进行了缩比模型试验。基于应变测试技术,设计研发了一套高灵敏度测力机构,用于间接测量拖缆及其附件的首端张力值,以求得拖缆的实际阻力。通过对实测数据的比较,分析了拖缆速度及横向干扰对拖缆阻力的影响。试验结果表明,在低速拖曳下拖缆阻力与速度的二次方成正比关系;在有横向干扰时,拖缆阻力可看作无干扰时的平衡力和与干扰频率有关的正弦脉动力的叠加,当干扰频率一定时,脉动阻力幅值与平衡阻力的比值基本为常数。基于以上试验结果,结合量纲分析法,能够对实际拖缆阻力进行较好估算。
Marine seismic streamers are an important equipment in ocean oil and gas resources exploration. To study the drag characteristics of marine seismic streamers towed and transversely disturbed, a streamer model test was carried out. Based on the strain testing technology, a set of highly sensitive force measuring mechanism was designed and developed to indirectly measure the head tension value of streamers and their attachments to obtain the actual resistance of the streamers. Through the comparison of measured data, the influence of towing speed and transverse disturbance on the towing resistance is analyzed. The experimental results show that the drag force is proportional to the square root of the speed under low speed towing. When there is horizontal disturbance, the towing resistance can be regarded as the balance force without disturbance and the superposition of the sinusoidal pulsation force related to the disturbance frequency , When the interference frequency is constant, the ratio of the amplitude of the pulsation resistance to the equilibrium resistance is basically constant. Based on the above test results, combined with the dimensional analysis method, the actual towline resistance can be better estimated.