|
 |
|
| Drilling Tool¡¯s Inside Blowout Prevention Device |
| ¡¡¡¡Drill-tool check Valve is a main Blowout prevent toolin drill tool and should be classified into four kinds ac-cording to its structure, i.e. arrow back pressure valve(FJ), Ball check valve(FQ), Butterfly check valve(FD) and Drop-in check valve¡£ |
Arrow-Shaped Check Valve
 |
| Parts List£º |
Item |
Component |
Qty |
Material |
1 |
Body |
1 |
36CrNiMo4 |
2 |
Valve Core |
1 |
2Cr13 |
3 |
O-Ring |
2 |
NBR |
4 |
Seat |
1 |
1Cr18Ni9Ti |
5 |
Adapter Body |
1 |
36CrNiMo4 |
|
|
Arrow check valve
The arrow check valve is one of inner blowout pre-vent tools that are commonly used in gas drill and re-pairing well, and is a kind of in-string blowout preventback pressure valve accompanying the drill enteringwell,once well-leakage and well blowout happen, it canautomatically and quickly shut the bore of valve by theupper inverse circulation pressure and plug the water-way of string so as to avoid the blowout and ensurethe safety of drilling equipment and person-life.
In addition, it can meet the normal kill requirement; alsoprovide inner sealing operation condition for someparticular operations, such as retrieving tool and drillingas blowout without kill or repairing well.
|
 Drop-in check valve
Drop-in check valve, as an important toll to preventwell kick and a BOP inside drilling string, which isdropped into well and prevent well kick and blowout justas necessary, is used to control the inner pressure ofdrilling rod as running/retrieving drill is forced under wellkick or a certain pressure. For it is not connected withdrilling rod, it is convenient to execute various drillingoperation.
As overflow happens under ground, the check valveis dropped or pumped into the water hole of the Kelly,and moves to be held against the shoulder of the stopring connected with the bottom of the on-stationconnector, the cone of the valve moves up, some hacklelock-teeth of on-station connector and the teeth-blockin the top of the check valve are locked each other, thecone moving up forces packer to dilate so as to seal thebore-wall, in the bottom hole sets steel ball and spring,the spring can load the steel ball into the sealing seat ofthe valve body, so that a strict seal mechanism is formed,here the on-station connector and check valve assem-bly composes a set of internal-BOP assembly.
Item |
Component |
Qty |
Material |
1 |
Adapter Body1 |
1 |
36CrNiMo4 |
2 |
Thrust Ring |
1 |
30CrMO |
3 |
Valve Core |
1 |
30CrMO |
4 |
Seal |
1 |
NBR |
5 |
Slip Insert |
3 |
30CrMO |
6 |
Slip |
1 |
30CrMO |
7 |
Retainer |
1 |
45 |
8 |
Lock Nut |
2 |
30CrMO |
9 |
Spring Seat |
1 |
30CrMO |
10 |
Spring |
1 |
65Mn |
11 |
Ball |
1 |
90Cr18MO |
|
|
| |
|
|
|
|
|
