Oilfield Catalog - Gates Corporation
Oilfield Catalog - Gates Corporation
Oilfield Catalog - Gates Corporation
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>Gates</strong> Hose Applications in the <strong>Oilfield</strong><br />
For ordering information, please see the<br />
<strong>Oilfield</strong> Hose section of your <strong>Gates</strong><br />
Guide.<br />
Choke and Kill Hoses<br />
Black Gold ® Choke and Kill and<br />
Super Choke and Kill Hose<br />
A choke-and-kill system is used in offshore<br />
drilling to control well kicks – pockets of<br />
high pressure gas that get into the drill<br />
string during drilling.<br />
As the gas moves upward, it expands,<br />
making the drilling mud too lightweight to<br />
control pressures in the hole. If the kick is<br />
too strong, it can blow out the well.<br />
To prevent this, the crew closes rams on<br />
the blowout preventer stack. This seals<br />
off the annulus – the pipeway through<br />
which mud returns from the wellhead on<br />
the seafloor to the drilling rig on the ocean<br />
surface.<br />
Next, high pressure mud, up to 15,000 psi,<br />
is pumped down the choke line to force<br />
the gas back into the formation.<br />
If this is not successful, high pressure cement,<br />
up to 15,000 psi, is pumped down<br />
the well through the kill line. The well is<br />
sealed off, the drilling unit is separated,<br />
and the well and all equipment in the hole<br />
are lost.<br />
When the blowout preventer system is on<br />
the seafloor, <strong>Gates</strong> Black Gold ® Choke and<br />
Kill (or Super Choke and Kill) hoses are<br />
used around the flexible joint (above the<br />
blowout preventer on the seafloor).<br />
This joint allows for rig movement with the<br />
waves and current.<br />
Choke and Kill hoses run from the preventer<br />
stack to the choke and kill pipelines attached<br />
to the marine riser.<br />
At the top of the marine riser, Black Gold ®<br />
Choke and Kill (or Super Choke and Kill)<br />
hoses are used around the drill string’s<br />
telescoping joint. They run from the choke<br />
and kill pipelines at the top of the riser to<br />
the choke and kill manifolds on the drill rig.<br />
These hoses often are called droop hoses.<br />
Choke hoses are interchangeable with kill<br />
hoses.<br />
<strong>Gates</strong> Black Gold ® Choke and Kill and Super<br />
Choke and Kill hoses are manufactured<br />
to handle up to 20 percent hydrogen sulfide<br />
gas for one hour at 200°F (93°C) at working<br />
pressure.<br />
Hydrogen sulfide (H2S) is a lethal gas encountered<br />
in rock formations in many drilling<br />
areas.<br />
www.gates.com/oilfield<br />
Page 27
Change language