Laboratory Evaluation and Field Application of a High Water Loss Plugging Agent KSD-1
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.
high water loss plugging agentlost circulationplugging
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