我队在某钻孔涌水层进行抽水时,对该层以上含水层曾采用黄泥球止水方法来隔离.因其上部存有裂隙和溶洞,所投泥球多落于其中,故进行数次未得成功,后用棕皮海带止水的方法,始顺利地完成该项任务.其方法是:首先在127套管下端以异径接手连接一长3公尺外径为89的岩心管(如图).然后在该岩心管上紧紧缠绕干海带辫(2公分粗,以三股编成)并于辫外包一层棕皮,以15号铁丝,300～400 My team in a drilling gushing layer of water pumping, the above aquifers have been used to stop the water method of blocking the ball of yellow mud.Because there are cracks and caves in the upper part of the cast ball falls in which the ball, so the number of The unsuccessful times, after the use of brown seaweed water stop method, the first successful completion of this task.The method is: First of all, the lower end of the 127 casing to take over with a diameter of 3 meters outside diameter of 89 core tube (Figure), and then tightly wrapped in the core tube dry kelp braid (2 cm thick, three-braided) and the outer layer of brown leather braid to 15 wire, 300 ~ 400