浮阀接头浮阀接头通常连接在钻头的上方，用来控制井底的流液。当停泵接单根时，可防止钻屑回流堵塞水眼；当出现井涌时，可阻止流液流进入钻具内，起到钻具防喷阀的作用。浮阀接头是防止井喷、井涌的专用工具。其结构分为板式浮阀接头、箭型浮阀接头两种。FloatValveSubFloatValveSubisusuallyconnectedonthetopofthebittocontroldownholeliquid.Whilestoppingpumpandconnectingwithsingle,itcanpreventwaterholefrombeingpluggedbyreflowingdrillings.Whenblowoutoccurrs,itcanserveassplashvalvetopreventliquidflowingintodrillingisdividedintoplatetypefloatsubandarrow-typefloatvalvesub.1.StructureFloatvalvesubc***istsofsub,floatvalveunitandaccessoryextractor.Whileusing,floatvalveunitshouldbeputintojointbody.Floatvalveunitiscomposedofbody,sealedring,sealgland,valvebonnet,torsionalspringandlimitmarker.2.PrincipleWorkingprincipleoffloatvalvesubisrathersimple.Whennormaldrillingandpumpingcirculation,thebonnetoffloatvalveunitwillbeopennedcompletely.Ifwellkickorpumpingoffoccurred,thebonnetwillclosewaterholedependsonelasticforceoftorsionalcanpreventblowoutinthedrillingtool.浮阀接头技术参数SpecificationofFloatValveSub型号type接头外径(mm)JointO.D.接头螺纹Connection浮阀外径(mm)FloatValveO.D.内径(mm)I.D.FFJT241241.375/8REGф121ф76FFJT228228.675/8REGф121ф76FFJT209209.665/8REGф121ф76FFJT203203.265/8REGф121ф71FFJT178177.841/2IFф98ф71FFJT165165.141/2REGф88ф57FFJT14614641/2REGф88ф57FFJT12112131/2REGф61ф51FFJT10810831/2REGф61ф38)