摘要
井漏是钻井过程中最常见且最难以治理的井下复杂情况之一.针对裂缝、缝洞等导致的钻井液失返恶性复杂漏失,提出一种可凝结高失水堵漏剂KSD-1,并对其进行了室内评价.结果表明:KSD-1 高失水堵漏剂与清水可以配制成不同浓度、可泵送的堵漏浆,堵漏浆加重后悬浮稳定性良好,抗温可达 200℃,在一定压力下可快速失水压实形成堵塞,堵塞可变形,具有一定抗压性,通过对裂缝的自适应性变化进行填充实现堵漏.堵塞酸溶率达 87%,高失水堵漏完成后可酸化解堵,保护储层.采用该堵剂结合高失水堵漏工艺,成功应用于现场两口井堵漏,为水基钻井液复杂漏失控制提供了有效的技术途径.
Abstract
Lost circulation is one of the most common and difficult downhole complications in the drilling process.A coagulable high wa-ter loss plugging agent KSD-1 was proposed and evaluated for the malignant and complex drilling fluid loss caused by cracks and holes.The results show that KSD-1 and water can be prepared into different concentrations of pumpable plugging slurry,and the plugging slurry has good suspension stability and temperature resistance up to 200℃.Under a certain pressure,the plugging can be formed by rapid water loss compaction.The plug-ging can be deformed and has a certain compressive resistance.The plugging can be realized by filling the adaptive change of the crack.The acid solubility of plugging is 87%,and after the completion of high water loss plugging,the acid can dissolve the plugging and protect the reservoir.The plugging agent combined with high water loss plugging technology has been successfully applied to plugging two wells in the field,providing an ef-fective technical approach for complex loss control of water-based drilling fluid.
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