煤岩渗透率对酸化作用响应规律的试验研究

发布时间：2018-05-16 04:28

本文选题：酸化 + 煤层气　；参考：《煤炭学报》2017年08期

【摘要】：酸化手段是油气井提高产能的重要手段,较小的酸化规模有可能极大地提高油气井产量,这对具有低渗透性特点的煤层气井开发具有重要启示。通过室内试验测定了酸液作用前后煤粉的矿物成分极限反应率和煤岩芯的渗透率,分析了酸化作用后煤粉极限反应率和煤岩芯渗透率的变化规律。结果表明:煤层中原始的孔裂隙发育和矿物成分组成对渗透率的大小具有重要影响;酸化手段可有效提高煤层渗透率,对于试验煤样,渗透率最大提高了18.42倍,盐酸质量分数在12%~15%为最佳。酸化时间过长会造成渗透率小幅度降低,应控制反应时间在12 h左右。
[Abstract]:Acidizing means is an important means to increase productivity of oil and gas wells. A small acidizing scale may greatly improve the production of oil and gas wells, which has important implications for the development of coalbed methane wells with low permeability. The limit reaction rate of mineral composition and permeability of coal core before and after acidizing action were measured through laboratory tests. The variation law of coal powder limit reaction rate and coal core permeability after acidification was analyzed. The results show that the development of the original pore and fissure and the composition of mineral composition have important influence on the permeability of coal bed, the acidizing method can effectively increase the permeability of coal seam, and for the test coal sample, the maximum increase of permeability is 18.42 times. The best mass fraction of hydrochloric acid is 12% and 15%. If the acidizing time is too long, the permeability will be reduced by a small margin, and the reaction time should be controlled at about 12 h.
【作者单位】：重庆大学资源及环境工程学院;重庆大学煤矿灾害动力学与控制国家重点实验室;中国煤炭科工集团重庆研究院有限公司;瓦斯灾害监控与应急技术国家重点实验室;山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金面上项目(51374236,51574280) 重庆市科技创新领军人才支持计划(CSTCKJCXLJRC14)
【分类号】：TE37

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