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以丝锥打捞井内套管,往往捞不上.且套管母扣部份呈喇叭形,如将小一级钻具下入被打捞套管内,外面加入钢砂进行打捞,铜砂不易控制会掉入套管外面,使打捞工作更加复杂化.为此,可采用下述方法,如图所示.即在此被打捞工具小一级的三用接头(異径接头)上,对称钻四个1/2时的斜孔,在三用接头下端打入木塞,并连接钻具,以防钢砂从此掉入孔内,然后从钻杆内加入直径为2.5～4.0公厘的钢砂,井轻轻击打钻杆,使钢砂从三用接头的斜孔进入被打捞套
To tap the shaft casing, often can not catch. And the casing buckle part was horn-shaped, such as a small drill into the casing has been salvaged, grit into the outside salvage, copper sand is not easy to control will fall To the outside of the casing, the salvage work is more complicated.To this end, the following method can be used, as shown in the figure, which is the salvage tool small three-connector (Reducing joint), four symmetrical drill 1/2 when the inclined hole, the lower end of the three-used connector into the cork, and connect the drill to prevent the sand fell into the hole from the inside, and then from the drill pipe diameter of 2.5 to 4.0 mm grit, Wells gently hit the drill pipe, the grit from the three-use connector oblique hole into the fishing set