FT型投入式止回阀是钻柱内防喷器。当有井喷预兆，立即卸开方钻杆，将回压阀总成投入钻杆水眼内，开泵送下就位后就能达到防喷目的。该工具结构简单、操纵方便，只要卸开方钻杆的接头螺纹便可以投入钻杆的水眼内，就位后就能达到内防喷的目的。投入式止回阀由联顶接头和止回阀总成两部分构成。联顶接头与止动环用螺纹联接并上紧扣和钻柱连接下入井内，在未投入止回阀总成时，作为钻柱上的一个接头。
Drop-in Type Check Valve : It is an internal preventer. When blowout is going to happen, the kelly rod should
be removed immediately and throw the back pressure valve assembly into the water hole and then
pumped downward to the required place. Thus , the blowout can be prevented. The valve body connect
on the drilling stem, Dropin check valve is a ball and sea of he***y duty, if only drop in the valve core at the
mouth of the well, it turn into the valve body.
投入式止回阀技术参数
Specification of Drop－in Type Check Valve
|
型号 Type |
止动 环内径 StopRing I.D.(mm) |
接 头 Joint |
止回阀总成 Check Valve Assembly |
工作压力 Working Pressure (Mpa) |
连接螺纹 Connection |
|||
|
外径 O. D (mm) |
内径 I.D (mm) |
长度 Length (mm) |
外径 O.D (mm) |
内径 I.D (mm) |
||||
|
FT89 |
30 |
89 |
35 |
335 |
33 |
8 |
35 70 |
NC26 |
|
FT105 |
33 |
105 |
38 |
350 |
36 |
10 |
35 70 |
NC31 |
|
FT121 |
50 |
121 |
56 |
395 |
54 |
18 |
35 70 |
NC38 |
|
FT159 |
54 |
159 |
60 |
435 |
58 |
23 |
35 70 |
NC50 |
|
FT168 |
64 |
168 |
70 |
435 |
68 |
33 |
35 70 |
NC50 |
|
FT178 |
64 |
178 |
70 |
515 |
68 |
33 |
35 70 |
5-1/2FH |
|
FT203 |
64 |
203 |
70 |
620 |
68 |
33 |
35 70 |
6-5/8REG |