WELL CONTROL SYSTEM Flashcards
is defined as the pressure at which a fluid or gas exists in the pores of a permeable rock. This is also called pore pressure.
Formation Pressure
followed by loss of fluid, also defined as
Formation breakdown pressure.
The amount of pressure a formation can withstand before the formation breaks down as a fracture is initiated, followed by loss of fluid, also defined as Formation breakdown pressure.
Fracture Pressure
is achieved by ensuring that the mud hydrostatic pressure overcomes formation pore pressures.
To maintain primary well control, the well should always be filled with mud with a density within the mud window.
Primary Well Control
The amount of pressure the formation can withstand before the formation accepts any fluids.
Leak-Off Pressure
A combination of one or more Well Barrier Elements that together constitute a method of containment of fluids within a well that prevents uncontrolled flow of fluids into another formation, or, to escape at surface
Well Barrier Envelope
is achieved by using valves to prevent the flow of fluid from the well until such time as the well can be made safe.
Secondary Well Control
Prevents uncontrolled influx of formation fluid into the well i.e., kick
Well Control System
A flow of formation fluids into the wellbore during drilling operations. The kick is physically caused by the pressure in
Kick
2 kinds of BOP
Land Rig BOP Stack
Floating Rig BOP Stack
Two basic types of BOPs
Annular Preventor
Ram Preventor
designed to seal off the annulus between the drillstring and the side of hole
Annular Preventor
may also seal off open hole if kick occurs while the pipe is out of the hole
Annular Preventor
made of synthetic rubber which, when expanded, will seal off the cavity
Annular Preventor
The ability to seal on a variety of pipe sizes is one advantage the annular blowout preventer has over the ram blowout preventer.
Annular Preventor
Designed to seal off the annulus by ramming large rubberfaced blocks of steel together;
Ram Preventors
set is configured as an opposing pair and, depending on function, are designed to close within the bore of the preventer;
Ram Preventors
are commonly available in single-, double-, triple- and quad-ram configurations
Ram Preventors
seal off open holes
Blind rams
seals a range of tubular sizes
Variable bore rams
seal off around drill pipe
Pipe rams
sever drill pipe
Shear rams
spacers between preventers that provide hookups for the choke line and kill line during a kick
Drilling Spool
a hydraulic pressure unit that keeps liquid under pressure in the tanks and provides a method to open and close the blowout preventers quickly and reliably.
Accumulator Unit
attached to the blowout preventer stack, usually directly opposite the choke manifold. Heavy weight fluid is pumped to the kill line into the well bore until balance has been restored.
Kill Line
device that is used to remove gas from the mud coming out of a well when kick is being circulating out.
Mud Gas Separator
an arrangement of piping and special valves, called choke
Choke Manifold
– a pipe attached to the blowout preventer stack out of which kick fluids and mud can be pumped to the choke manifold when a blowout preventer is closed in on a kick.
Choke Line
