深海天然气水合物钻探取样中的“桩效应”分析

Study on the “Pile Effect” in Gas Hydrate Sample Coring in Deep Sea

摘要:

建立了天然气水合物钻探取样过程中“桩效应”的数学模型，通过解析分析，提出了取样高度的隐式解。分析了取样筒内径和样品与取样筒之间摩擦系数对取样高度的影响。参数分析表明，岩层的内摩擦角和粘聚力对取样高度也有很大的影响。取样深度对取样率的影响较小。

Abstract:

The mathematical model of “pile effect” was built in the process of gas hydrate sampling coring and the implicit analytical solution for the sample height is presented by analytical analysis. The influences of the sampling tube diameter and the friction coefficient between the sample and the sampling tube were analyzed. Parametric analysis shows that the inherent friction angle and cohesion of the target layer have great influence on the sample height. The sampling depth in the target layer has unapparent influence on the sampling rate.