关键词: 复合堵漏剂, 平衡区域, 新型堵漏仪, 地层评价, 堵漏配方

Abstract: The compound plugging material is broadly distributed in the leakage formation after compound plugging agent is injected into the leakage formation.The proportion of various plugging material in some area is balanceable relatively.So,there is a balance area.The concept of balance area is useful for lost circulation control.A novel lost circulation simulator for simulating leakage formation and lost circulation control procedure perfectly was developed.The distribution and occlusion status of plugging material and the position of balance area were experimented on core in laboratory and could be observed from the experimented core cutting.The lost circulation control formula can be modulated till the experiment successes.The experimental result showed that the balance area would move towards the entry side of core,if the effect of lost circulation control was good.Otherwise,it will move towards the outlet of core,even no balance area appeared in the core.The experiment of new lost circulation simulator has a good repeatability.The formula acquired by experiment was applied directly to the lost circulation control in field.The result showed that this technology has been successfully applied in the procedure for lost circulation prevention and control.

Key words: compound plugging agent, balance area, novel lost circulation simulator, formation assessment, plugging formula