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塔里木盆地T气藏构造高部位产层岩性复杂、天然裂缝发育、钻井液污染严重,常规解堵酸化效果不理想。采用室内模拟实验并结合扫描电镜分析,阐释了钻井过程中T气藏裂缝性储层伤害机理,探索了网络酸化新型技术的可行性。实验结果表明:钻井液对裂缝性储层渗透率的伤害率大于85%,天然裂缝开度越大伤害越严重;盐酸溶蚀率高(大于20%)的裂缝性储层网络酸化可行性强,以常规酸化的2~3倍注酸量和注酸排量实施网络酸化可有效解除天然裂缝伤害;盐酸溶蚀率低(小于10%)的储层实施网络酸化风险高。现场应用试验表明,网络酸化较常规解堵酸化效果好,可以推广至类似的储层改造。
Due to the complex lithology, natural fractures and serious drilling fluid contamination in the T-shaped gas reservoir in the Tarim Basin, the conventional acid-removal and plugging effect is not satisfactory. By means of indoor simulation experiments and scanning electron microscopy analysis, the mechanism of fractured reservoirs damage in T gas reservoir during drilling is explained, and the feasibility of new technology of network acidification is explored. The experimental results show that the damage rate of drilling fluid to the permeability of fractured reservoir is more than 85%, the more serious the natural fractures are, the more severe the damage is. The fractured reservoir network with high corrosion rate of hydrochloric acid (more than 20%) is feasible, The acidification of the network with 2 to 3 times the acidity and the amount of acid injection can effectively relieve the natural fracture damage. The low acidification rate (less than 10%) in the reservoir has a high risk of network acidification. Field application tests show that the acidification of the network is better than the conventional solution and acidification, which can be extended to similar reservoir reconstruction.