裂缝性气藏封缝堵气技术研究
发布时间：2019-07-12 07:50
【摘要】：塔里木油田塔中地区碳酸盐岩奥陶系储层地质条件复杂,储层裂缝发育,裂缝开度为20~400μm的小裂缝和微裂缝所占比例在50%左右,钻井过程中井漏溢流频发,气侵现象严重,增加了井控风险。由于地层微裂缝分布复杂,且温度高(180℃),导致架桥粒子、充填粒子级配难度大,钻井液封堵效果不理想,而采用常规钻井液封堵评价方法在模拟裂缝形态和效果评价方面与现场实际存在着较大的差距。为此,提出了有针对性地封缝堵气评价方法 :利用天然/人造岩心制作出微裂缝岩心模型,微裂缝开度介于20~400μm之间,缝面粗糙度与天然裂缝接近;自主设计了封缝堵气实验评价装置,建立了微米级裂缝的封缝堵气评价方法。室内初步优选出抗高温的颗粒、纤维、可变形材料等纳微米封堵材料,并形成封堵配方,封堵配方与聚磺钻井液体系、ENVIROTHERM NT体系配伍性好,且酸溶率高于70%,不易污染储层。
[Abstract]:The geological conditions of carbonate Ordovician reservoir in Tazhong area of Tarim Oilfield are complex, and the reservoir fractures are developed. The proportion of small fractures and microfractures with fracture opening of 20 ~ 400 渭 m is about 50%. The leakage and overflow of wells occur frequently during drilling, and the phenomenon of gas invasion is serious, which increases the risk of well control. Because of the complex distribution of formation microfractures and high temperature (180 鈩，
本文编号：2513566
[Abstract]:The geological conditions of carbonate Ordovician reservoir in Tazhong area of Tarim Oilfield are complex, and the reservoir fractures are developed. The proportion of small fractures and microfractures with fracture opening of 20 ~ 400 渭 m is about 50%. The leakage and overflow of wells occur frequently during drilling, and the phenomenon of gas invasion is serious, which increases the risk of well control. Because of the complex distribution of formation microfractures and high temperature (180 鈩，
本文编号：2513566
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