钻杆浮阀一般连接在钻头之上，主要用来防止井涌或井喷的发生。另外在不需要下入工具时，还可以作为配合接头来使用。实际上钻杆浮阀就是个单向阀，它不阻碍泥浆的正循环，但能阻止井涌或井喷。减少泥浆的损失和保持钻台的清洁。
Drill Pipe Float Valve
The ZFF Type Float Valve is one kind of unidirectional check valve which can be used in preventing from
blowout and well kick to reduce loss of drilling fluid and keep the rig floor clear.
Drill pipe float valve c***ists of the body and the float valve assembly. The float valve assembly is installen
into the body when using(sea schema3).
The float valve assembly (sea schema1 and schema2) includes cage, valve, valve sela disk, spring, side seal, valve seal, valve
guide, valve rod etc. when the assembly is not working, the backpressure action of spring make it closed.
The valve is opened as circulating mud downward and the mud can flow through it. The valve is closed as
there is the backpressure.
钻杆浮阀技术参数
Specification of Drill Pipe Float Valve
|
型 号 Type |
外 径 O.D.(mm) |
耐回压 Bearing Back Pressure |
连 接 扣 型 Connection |
连接钻铤规格 Drill Pipe (in) |
|
ZFF127 |
φ127 |
35MPa 70MPa |
NC38×NC38 |
5″ |
|
ZFF159 |
φ159 |
35MPa 70MPa |
N***6×N***6 |
6 1/4″ |
|
ZFF165 |
φ165 |
35MPa 70MPa |
NC50×NC50 |
6 1/2″ |
|
ZFF178 |
φ178 |
35MPa 70MPa |
NC50×NC50 |
7″ |
|
ZFF203 |
φ203 |
35MPa 70MPa |
6 5/8REG×6 5/8REG |
7″ |
|
ZFF228.6 |
φ228.6 |
35MPa 70MPa |
7 5/8REG×7 5/8REG |
9″ |
|
ZFF241 |
φ241 |
35MPa 70MPa |
7 5/8REG×7 5/8REG |
9 1/2″ |