箭形止回阀:能防止井下溢流从钻具内喷出,防止井喷事故,减少泥浆的损失和保持钻台的清洁。箭型回压阀是钻井过程中钻具内防喷工具之一。该工具同其他结构形式的回压阀相比,具有强度高、耐压高、安全可靠的有点。
Arrow Back Pressure Valve:
Arrow Back Pressure Valve is an integrated tool which can prevent dowhole kick from blowout,also
keep off the blowout accident. Thus reducing mud loss and ensuring a clean rig pared
with the other back pressure calve,it possesssed the advantage of high strength,high pressure-resistant,safety and reliable,etc.
Arrow type back pressure valve is an important tool preventing of blowout. The design of the arrow type
back pressure valve allows for an on-site determination of back pressure to be set at surface.
The tool should be connected to needed drilling position in operation.Under normal drilling condition,
drilling liquid pass through valve body and water channel to furnish downward.When happened well kick
and blowout, underground pressure impel valve body to move upward 14° pyramidal face of valve body is
fitted tightly against gasket pyramidal face,they can prevent drilling liquid within the drilling from gushing
and blowout upward.
箭形止回阀技术参数
Specification of Type Arrow Back Pressure Valve
型号 Type |
外径O.D (mm) |
内径 I.D (mm) |
连接螺纹 Connection |
***大密封压力 Max. Seal Pressure (Mpa) |
FJ89 |
89 |
33 |
NC26 |
35 70 |
FJ105 |
105 |
44 |
NC31 |
35 70 |
FJ121 |
121 |
56 |
NC38 |
35 70 |
FJ159 |
159 |
70 |
N***6 |
35 70 |
FJ165 |
165 |
82 |
NC50 |
35 70 |
FJ168 |
168 |
82 |
NC50 |
35 70 |
FJ178 |
178 |
82 |
5-1/2FH |
35 70 |
FJ203 |
203 |
82 |
6-5/8REG |
35 70 |
FJ229 |
229 |
82 |
7-5/8REG |
35 70 |