深海能源土流变和非稳态多场影响的井壁稳定分析

doi:10.13722/j.cnki.jrme.2019.0857

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摘要针对深海能源土中钻井时井壁稳定问题，考虑储层中非稳态渗流场、温度场和土体流变特性，并结合屈服准则，建立井壁稳定解析模型。通过分离变量法求解渗流和温度场控制方程，得到与空间、时间相关的压力、温度分布的解析解；利用水合物相平衡曲线确定水合物分解锋面，考虑分解对储层黏弹力学参数的影响，通过拉普拉斯变换求得考虑渗流影响的井周应力和位移。通过参数分析考察了渗流场及温度场分布的特点以及地层力学参数劣化对井壁稳定的影响。结果表明，渗流场和温度场的影响范围随时间向外推进，渗流场的传递速度更快；分解区与未分解区的剪切松弛模量之比为定值时，整个地层应力随时间单调变化；水合物分解导致分解区劣化程度较低时，井壁处等效应力在稳态之前会达到极值，井壁失稳危险较高。

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	胡韬1
	王华宁1
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	郭振宇1
	蒋明镜2
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关键词 ：土力学, 深海能源土, 非稳态渗流, 黏弹性, 井壁稳定

Abstract：To analyze the wellbore stability during drilling in methane hydrate-bearing sediments (MHBS)，an analytical wellbore stability model is established by combining the viscoelastic solution with yield criterion. In this model，the unsteady seepage and temperature fields，as well as the rheological properties of the reservoir are taken into account. The analytical solutions of seepage pressure and temperature which are the functions of space and time are obtained by using the method of separation of variables. The phase equilibrium curve of hydrate is applied to determining the dissociation front of hydrate，and the effect of dissociation on viscoelastic parameters is considered. The solutions of time-dependent stress and displacement considering the influence of seepage are analytically derived by Laplace transform technique. The characteristics of seepage and temperature fields are investigated，and the influence of reduction of mechanical parameters of formations on wellbore stability are also studied. The results show that the influence range of seepage and temperature fields increase with time，and the propagation velocity of seepage field is faster than temperature field. When the ratio of shear relaxation modulus between the dissociated and the undissociated region is a constant，the stress of the formation changes monotonously with time. When the reduction of of the dissociated region is small，the equivalent stress at the borehole wall will reach the extreme value before the steady state，and the borehole wall is in high risk of instability.

Key words： soil mechanics methane hydrate-bearing sediments unsteady seepage viscoelastic wellbore stability

引用本文:

胡韬1，王华宁1，2，郭振宇1，蒋明镜2，3. 深海能源土流变和非稳态多场影响的井壁稳定分析[J]. 岩石力学与工程学报, 2020, 39(S1): 3206-3216.
HU Tao1，WANG Huaning1，2，GUO Zhenyu 1，JIANG Mingjing 2，3. Wellbore stability of drilling in rheological methane hydrate-bearing sediments considering the influence of unsteady multiple fields. , 2020, 39(S1): 3206-3216.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0857 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3206

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