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。
Float Valve Sub
Float Valve Sub is usually connected on the top of the bit to control down hole liquid. While stopping pump
and connecting with single, it can prevent waterhole from being plugged by reflowing drillings. When
blowout occurrs, it can serve as splash valve to prevent liquid flowing into drilling is divided into
plate type float sub and arrow-type float valve sub.
1. Structure
Float valve sub c***ists of sub, float valve unit and accessory extractor. While using, float valve unit
should be put into joint body. Float valve unit is composed of body, sealed ring, seal gland, valve bonnet,
torsional spring and limit marker.
2. Principle
Working principle of float valve sub is rather simple.When normal drilling and pumping circulation,the
bonnet of float valve unit will be openned completely.If well kick or pumping off occurred,the bonnet will
close waterhole depends on elastic force of torsional can prevent blowout in the drilling tool.
浮阀接头技术参数
Specification of Float Valve Sub
型号 type |
接头外径(mm) Joint O.D. |
接头螺纹 Connection |
浮阀外径(mm) Float Valve O.D. |
内径(mm) I.D. |
FFJT241 |
241.3 |
7 5/8 REG |
ф121 |
ф76 |
FFJT228 |
228.6 |
7 5/8 REG |
ф121 |
ф76 |
FFJT209 |
209.6 |
6 5/8 REG |
ф121 |
ф76 |
FFJT203 |
203.2 |
6 5/8 REG |
ф121 |
ф71 |
FFJT178 |
177.8 |
4 1/2 IF |
ф98 |
ф71 |
FFJT165 |
165.1 |
4 1/2 REG |
ф88 |
ф57 |
FFJT146 |
146 |
4 1/2 REG |
ф88 |
ф57 |
FFJT121 |
121 |
3 1/2 REG |
ф61 |
ф51 |
FFJT108 |
108 |
3 1/2 REG |
ф61 |
ф38 |