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            The drilling tool

            The drilling tool

            By-Pass Valve

            TIME:2017/3/21 14:45:52

            鉆具防堵旁通閥

            By-Pass Valve

              PTF通閥是用于復雜地層中噴射鉆井和鉆開油氣層前,將該閥接在靠近鉆頭的鉆柱處。在鉆井過程中,當需要往井內替入稠泥漿或重泥漿,以及特殊作業,因鉆頭水眼堵塞而無法解堵時,該閥可提供有利幫助解堵的一種新型井下隨鉆工具。

            During drilling operation, when well kick is taken place and bit bore is blocked. The by-pass valve can be opened to go fluid circulation and well killing. Before drilling in flow gas formation, the by -pass valve shall be located near or on the bit. When take place well kick and pump pressure is too high or blocked, the following steps can be taken to open the by-pass valve:

            ?     Discharge Kelly and drop in a steel ball (or a Nylon ball) which is carried by tool;

            ?     Connect with Kelly;

            ?     Put ball into retainer by pump circulation;

            ?     When fluid is closed, the shear pin can be sheared off with adding 0.5~1.5Mpa

            pump pressure than original pump pressure;

            ?     After pin is sheared, the seal sleeve move down to open the discharge hole and

            pump pressure come to drop down , then normal circulation and well killing operation can be started.

            Specifications

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            型號
            Model

            外徑 O.D.(mm)

            密封套水眼直徑
            Seal sleeve (mm)

            上端連接
            Top Connection (BOX)

            下端連接
            Bottom connection

            銷釘剪斷壓力
            Pump Pressure of shear-off shear pin

            鋼球直徑
            O.D. of Steel ball (mm)

            PTF105

            105

            32

            NC31

            NC31(PIN)

            3-10MPa

            35

            PTF121A

            121

            38

            NC38

            NC38(PIN)

            3-10MPa

            45

            PTF127

            127

            38

            NC38

            NC38(PIN)

            3-10MPa

            45

            PTF127C

            127

            38

            NC38

            3 1/2 REG(BOX)

            3-10MPa

            45

            PTF159

            159

            49

            NC46

            NC46(PIN)

            3-10MPa

            54

            PTF159B

            159

            49

            NC46

            4 1/2 REG(BOX)

            3-10MPa

            54

            PTF168

            168

            50.8

            NC50

            MC50(PIN)

            3-10MPa

            57

            PTF203

            203

            62

            6 5/8 REG

            6 5/8 REG(PIN)

            3-10MPa

            65

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