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大顶子地质队常山工区,堆积层较厚,约30米,坍塌现象极为严重,OK1孔处理坍塌曾影响17个小班,没有生产。OK4孔也同样遇到这一现象,多次处理无效,经研究后采用边钻进边下套管的方法:每钻进一定深度(2-3米左右),即将粗径放于孔内,外面用大一级的套管封闭;然后先提出粗径,再下钻钻进,这样钻进一段,封闭一段,效果很好。一、具体做法:在处理砾石坍塌中是用130毫米口径钻进的,第一次钻进3．9米左右,将钻具从井口卸开,打开立轴,然后在外面打入146毫米套管3．4米。再提出粗径,这样逐段封闭,有效的防止了砾石坍塌现象,顺利地穿过了砾石层。二、优点:1．下套管时不提粗径而将钻具放在孔内,防止了孔壁坍塌。2．因有粗径在孔内导正,可避免套管不正等现象产生。3．井内有粗径导正逼直,下入套管下端,不致挤蹩。4．砾石层较厚者,可逐段封闭。三、注意事项:1．下入套管的长度要计算好,一般应比钻进深度短400-500毫米左右,以免套管和粗径两者发生挤夹。2．套管连结要紧固,以免在钻进中从下部返回。3．在下套管时,首先要用钳子扭,扭不下去时,可用吊锤击打,打时要用手将套管把正,边打边扭,避免钻具和套管被井内泥粉卡塞。4．套管下好后,提孔内钻具时,要预先合上立轴,用给进把将粗径活动后再提,以免将套管一起拔出。5?
Dacheng Geological Team Changshan work area, thick layer, about 30 meters, the collapse is extremely serious, OK1 hole collapse has affected 17 small classes, there is no production. OK4 hole also encountered this phenomenon, many times to deal with ineffective, after the study by drilling into the side of the casing method: each drill into a certain depth (2-3 meters), about to put in the hole diameter, Outside with a large level of casing closed; and then put forward a large diameter, and then drilling, so drilling for a period of closure for a period, the effect is very good. First, the specific approach: In dealing with the gravel collapse is 130 mm diameter drilling, the first drill about 3.9 meters, the drill unloaded from the wellhead, open the vertical shaft, and then into the 146 mm casing 3.4 meters. Then put forward a large diameter, so that the paragraph by paragraph closed, effectively prevent the phenomenon of gravel collapse, smooth through the gravel layer. Second, the advantages: 1. When the casing does not mention the diameter of the drill on the hole, to prevent the collapse of the hole wall. 2. Due to the large diameter guide in the hole, can avoid the phenomenon of casing is not correct and so on. 3. Inside the well, there is a large diameter guide is straight, into the bottom of the casing, will not squeeze bad. 4. Gravel thicker, can be closed paragraph by paragraph. Third, pay attention: 1. Under the length of the casing to be calculated, the general should be shorter than the depth of drilling 400-500 mm or so, in order to avoid casing and the diameter of the two squeezed folder. 2. Casing connections should be tightened so that they do not return from the lower part during drilling. 3. In the next casing, the first use of pliers twisting, twists and turns can be hit hammer, hit the casing to be positive when playing, while playing the twist, to avoid drilling mud and casing were mud powder stuck . 4. After the casing is good, when lifting the drill, to close the vertical shaft in advance, with the feed will be raised after the diameter of the move, so as not to pull the casing together. 5?