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投入式止回阀是钻柱内防喷器。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。投入式止回阀由就位接头和止回阀总成二大部分构成。就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
It is an inside BOP (blowout preventer)in the drill string.It is simple in structure and easy to operate.When blowout is going to be happened,the thread connections of the Kelly are screwed out immediately and the back pressure valve is put into the I.D. of drill pipe and then pumped ;downward to the required place.Thus the blowout accident can be prevented.The tool is consisting of landing sub and check valve assembly.The landing is thread connected with stop ring and tightened on and put into downhole with drill string .The landing sub is used as a sub above drill string before check valve is run in downhole.
技术规格及参数
| 规格 |
止回阀总成 |
凡尔接头 |
止动环 |
密封压力
Mpa |
螺纹类型 API |
| 外径(mm) |
外径(mm) |
内径(mm) |
| FT89 |
33 |
89 |
30 |
35
(70) |
NC26 |
| FT105 |
36 |
105 |
33 |
NC31 |
| FT121 |
54 |
121 |
50 |
NC38 |
| FT159 |
58 |
159 |
54 |
NC46 |
| FT168 |
68 |
168 |
64 |
NC50 |
| FT178 |
68 |
178 |
64 |
5 1/2 FH |
| FT203 |
68 |
203 |
64 |
6 5/8 REG |
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