考虑水锁损害的致密砂岩气藏产能分析

发布时间：2018-06-16 02:15

本文选题：致密砂岩 + 液相侵入　；参考：《天然气地球科学》2017年05期

【摘要】：致密砂岩气藏在钻井、完井和储层改造过程中容易受到水锁损害,影响气井产能。基于对流扩散模型,分析了液相侵入深度随时间的变化。基于Forchheimer渗流方程,建立了考虑水锁损害的致密砂岩气藏直井二项式稳态产能模型。分析了紊流效应、启动压力梯度、渗透率应力敏感和水锁损害范围及其程度对气井产能的影响。结果表明水锁损害造成液相侵入区气相渗透率减小,导致井周压降梯度和启动压力梯度显著增加。水锁损害造成的产气量降低远大于非达西效应、启动压力和应力敏感的影响。液相侵入初期造成的气井产量降低最为明显,随液相侵入深度的增加,产气量先急剧降低,然后趋于平缓。水锁损害范围和损害程度越大,气井产量降低越多。
[Abstract]:Tight sandstone gas reservoir is easily damaged by water lock during drilling, completion and reservoir reconstruction, which affects gas well productivity. Based on the convection-diffusion model, the variation of the depth of invasion of liquid phase with time is analyzed. Based on Forchheimer seepage equation, a binomial steady-state productivity model of tight sandstone gas reservoir with water lock damage is established. The effects of turbulence effect, starting pressure gradient, sensitivity of permeability stress and damage range of water lock on gas well productivity are analyzed. The results show that the water lock damage results in the decrease of gas phase permeability in the liquid-phase invasion zone, and the increase of the pressure gradient around the well and the starting pressure gradient. The decrease of gas production caused by water lock damage is much larger than that of non-Darcy effect, and the effect of start-up pressure and stress sensitivity. At the beginning of liquid-phase invasion, the production of gas wells decreases most obviously, and with the increase of the depth of liquid-phase invasion, the gas production decreases sharply and then tends to level off. The greater the damage range and the degree of water lock damage, the more the gas well production decreases.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;
【基金】：国家科技重大专项(编号:2016ZX05021-004) 国家自然科学基金项目(编号:51674217)联合资助
【分类号】：TE328

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