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酸化解堵可一定程度上改善油气储层开发效果.为进一步明确酸化解堵多尺度、多物理过程实际近井地带动态耦合及微观机理，基于储层特征参数，引入扰动系数，构建了考虑达西流和非达西流的双重介质酸岩反应双尺度、多物理场数值模型，通过二维线性反应流动模型和符合现场实际的径向砂岩油藏酸化模型开展数值模拟研究.结果表明，随着酸液注入速度的增大，溶蚀形态依次表现为均匀溶蚀、扩张溶蚀、蚓孔溶蚀、锥形溶蚀，酸液流动存在由活塞式均匀流动到不稳定流动的转变，稳定流动区域逐渐缩小至某一固定范围，且酸液波及区域面积“先减小后增大”的趋势.对于非均质砂岩储层，溶蚀模式仅与注入Damkohler(Da数)相关，低pH值酸液可有效降低作业时间.孔隙结构的非均质性会引起砂岩储层产生蚓孔作用及蚓孔竞争，酸液溶蚀由于不同方向的孔渗结构差异井壁周围发育出具有高渗流能力的长度不等的蚓孔.在酸蚀过程中，近井地带大孔隙占比增至原有数值的2倍左右，而其他区间的孔隙占比则出现0.56%～0.55%不同程度地下降.对于实际井筒周围的径向流场，大部分酸液消耗于井壁附近，远井地层只是作为渗流阻力区，解堵效果较为局限.
Abstract：Acidizing and plugging removal can improve the development effect of oil and gas reservois to a certain exteat.In order to further clarify the dynamic coupling and microscopic mechanism of multi-scale and multi-physical processes of acidizing and plugging removal in the actual near-wellbore area, based on the reservoir characteristic parameters, this paper constructs a dual-scale, multi-physical field numerical model for rock reactions dual-media acid-considering Darcy flow and non-Darcy flow in matrix porous media.The reservoir is considered as heterogeneous porous medium by disturbance coefficient, and numerical simulation is carried out by two-dimensional linear reaction flow model and radial sandstone reservoir acidification model in line with the actual field.The results show that with the increase of acid injection rate, the dissolution is manifested as uniform dissolution, expansion dissolution, wormhole dissolution and cone dissolution.The acid flow changes from piston uniform flow to unstable flow, and the stable flow area gradually decreases to a fixed range.For heterogeneous sandstone reservoirs, the dissolution mode is only related to the injected Damk9hler number(Da number),and low-pH acid can effectively reduce the operation time.The heterogeneity of pore structure will cause wormhole effect and wormhole competition in sandstone reservoirs.Due to the difference of pore and permeability structure in different directions, acid dissolution develops wormholes with different lengths and high seepage capacity around the wellbore.Under the action of acid etching, the proportion of macropores in the near-wellbore area increased to about 2 times of the original value, while the proportion of pores in other intervals decreased by 0.56%-3.55% to varying degrees.For the radial flow around the actual wellbore, most of the acid is consumed near the wellbore, and the far-well formation is only used as the seepage resistance zone to remove the plugging effect.
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基本信息:
DOI：10.16112/j.cnki.53-1223/n.2025.05.521
中图分类号:TE357.2
引用信息:
[1]马世东,周振永,陈德照,等.疏松砂岩储层解堵溶蚀过程渗流特性模拟研究[J].昆明理工大学学报(自然科学版),2025,50(05):21-34.DOI:10.16112/j.cnki.53-1223/n.2025.05.521.
基金信息:
陕西省重点研发计划项目（2022ZDLSF07-04）
2024-05-15
2024
2025-11-12
2025
2
2025-03-13
2025-03-13
2025-03-13