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反循环钻进方法目前正在广泛的推行.現在普遍采用的反循环井口封闭盖,多是用丝扣直接连接在井口管上面.这种连接方法,由于丝扣较长,扭入时,既费时间,也容易扭歪;同时,丝扣易磨损,封闭盖需常更换,不经济;而它的最大缺点,还是丝扣连接处容易旷动,工作时,循环水易从丝扣处涌出,破坏循环,影响钻进.鉴于这种情况,经过研究,我们认为如果采用法兰盘式的连接方法,就会克服上述缺点,保证正常的反循环钻进.法兰盘式的井口封闭盖连接情况,如图所示.这
Reverse circulation drilling method is currently being widely implemented.Currently used reverse circulation wellhead closure cover, mostly with threaded fasteners directly connected to the top of the wellhead pipe.This connection method, due to the longer screw, twist when both costs Time, but also easy to twist; the same time, the threaded buckle easy to wear, the closure of the cover need to be replaced, uneconomical; and its biggest drawback, or threaded connection easy Kuang, work, easy to circulate water from the threaded place , Destroying the cycle, affecting the drilling In view of this situation, after research, we think that if the flange connection method, it will overcome the above shortcomings, to ensure normal reverse circulation drilling. Connection, as shown