我们根据几种钻具使用中存在的问题，自行设计出一种SY—1型单动双管钻具接头（见附图）。投入五台钻机进行生产性试验，孔深均在800米左右，经生产实践，该钻具接头性能良好，深受钻机工人欢迎。现在全队13台钻机，已全部采用这种钻具接头。 According to several problems in the use of drilling tools, we have designed a SY-1 type single action double pipe drill joint (see photo). Five drilling rigs were put into production test. The depth of holes was about 800 meters. Through the practice of production, the joint performance of the drill was good and was very popular with the rig workers. Now the team of 13 rigs, have all adopted this drill joint.