Model 'BP' Wireline Setting Tools
Compact Single Stage
|Model 'BP' wire line pressure setting tools are compact tools inside
which the ignition and burning of a pyrotechnic power charge
(manufactured by TITAN SPECIALTIES, Pampa, Texas) produces gas
pressure that elongates the tool. This provides the stroke and force
necessary to set and anchor conventional bridge plugs, packers, and
cement retainers provided by various manufacturers. The tools feature
pressure balanced top and bottom pistons to eliminate presetting of the
mentioned products caused by high hydrostatic well pressure.
An electrically actuated high temperature rated igniter (also
manufactured by TITAN SPECIALTIES) located at the upper end of the
tool is ignited and produces a flash flame which, in turn, ignites the
power charge that is located directly below the igniter. The power
charge, which is constructed of carefully controlled combustible
elements, begins a slow burn lasting approximately 30 seconds. The
resultant gas derived from the burning charge gradually builds to high
pressure and causes the tool to elongate.
The pressurized gas migrates down the center of the top piston and out
into an annular cavity formed between the top piston and connector
sub. The pressure acting on this area drives the outside of the tool
(consisting of top and bottom cylinders) downward while the top and
bottom pistons remain stationary. This motion anchors the bridge plug
to the casing i.d. then pulls the shear stud of the bridge plug apart,
freeing the setting tool for removal from the well.
An oil damper system is built into the tool to control the speed at which
the tool strokes. As the tool elongates, this oil is forced through an
annular orifice and out of the tool at a controlled rate and prevents the
tool from stroking too fast, causing damage to the tool once the shear
stud has parted.
Note: It is mandatory that the tool be filled to capacity With oil each use
or damage to the tool will result.
Excess oil will be purged out automatically during assembly. Likewise,
oil expansion caused by high well temperature during running will be
purged in the same manner.
In wells where hydrostatic pressure is less than 10,000 psi, all tool
sizes are available with manual bleeder valve assemblies. This valve
provides a safe, easy method of bleeding trapped gas pressure from
the tool before disassembly is begun. When bottom hole pressures
exceeding 10,000 psi are to be encountered, the manual bleeder valve
and its corresponding sub are replaced by a portless sub. Bleeding is
then accomplished by backing the firing head out of the setting tool.
Both methods of bleeding pressure are illustrated in the disassembly
steps found later in this manual.