Sand-cleanout with foam fluid can effectively reduce leakage of flushing fluid in low pressure oil wells, without the need of any other LCM materials.

• 针对漏失井使用水基冲砂洗井液不返液或漏失量大的问题,不用添加任何化学堵漏剂,使用低密度泡沫流体冲砂洗井,可有效地减轻低压井中冲砂液的漏失。