钻杆活动肘节的研制与应用

Development and application of movable elbow joint for drill pipe

在煤矿井下钻孔施工过程中,钻杆断裂事故往往发生在钻孔塌孔处,由于该处钻孔孔径扩大,使得落鱼头位置与钻孔不同心,而采用公、母丝锥进行打捞时难以接触落鱼头,容易导致打捞失败。针对钻孔孔径扩大段钻杆断裂事故打捞难度大、成功率低的问题,首次开发了适用于煤矿井下钻杆断裂事故的活动肘节打捞工艺以及研制了一种配套该工艺的凸轮-连杆式结构的活动肘节,并利用该活动肘节打捞工艺在钻孔施工现场对钻杆断裂事故进行处理并取得成功,表明采用该活动肘节打捞工艺能有效提高钻杆断裂事故打捞的成功率。

In the process of underground drilling in coal mines, drill pipes break at the borehole collapse site. Because of the enlargement of the borehole diameter, the position of the fish head is different from that of the borehole, and it is difficult to contact the fish head when fishing with male and female taps, it could easily lead to failure. Aiming at the difficulty and low success rate of fishing for drill pipe break accident in the enlargement of the borehole diameter, the fishing technology of movable elbow joint was developed to deal with the drill pipe breaking in underground coal mine, and a cam-link type movable elbow joint was developed to match the technology. The fishing technology of movable elbow joint was used to deal with the broken drill pipe in the drilling site, and it significantly improved the success rate of fishing.