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Permanent Miniature Bridge Plug

APPLICATION / OPERATION:

The permanent miniature bridge plug is designed to set in coiled tubing or drill collars. It is designed to withstand differential pressures of 10,000 psi at 350F. In house, the bridge plug is successfully pressure tested at 7,500 psi. The bridge plug is available in four sizes: 0.750, 0.875, 1.12, and 1.37, which can be set on slickline or electric line.

The permanent miniature bridge plug has opposed, case hardened slips located above and below a three piece rubber pack-off system, manufactured out of either HSN (Highly Saturated Nitrile) or Viton. The pack-off elements are contained by rocker action metal back-up rings that eliminate extrusion of the elements at high temperatures and pressures. A ratchet lock ring retains the setting force applied to the slips and pack-off to maintain a constant sealing pressure.

To assure centered setting of the small diameter plug in coiled tubing and/or drill collars, special ribbed cones direct the slips to evenly spaced positions against the pipe. Should it be necessary to remove a permanent bridge plug after setting, a milling process is recommended as the plug is constructed of mild steel and is not considered drillable.

The miniature permanent bridge plugs have many advantages:

  1. The small O.D. of the bridge plugs allow them to be run in tubing with size restrictions like coiled tubing, and still form a fluid tight seal against the tubing wall.
  2. In addition to electric line, the plugs also can be set with a pressure activated safety firing head or a jar down firing head.
  3. Depending on the size of the bridge plugs, setting sleeves are available to attach to the 0.875 setting tool.
All Permanent Miniature Bridge Plugs are now available in a pump-through configuration with a check valve rated to a standard cracking pressure of 25 psi and a pressure rating to 6,000 psi. Adjustable cracking pressures are available on request.
 
Trinity Tools is pleased to announce the successful design, testing and manufacture of the 0.750 Permanent Miniature Bridge Plug and 0.750 Multi-Stage Setting Tool. A 0.750 setting sleeve is used on the 0.750 Multistage Setting Tool only.
 
Permanent Bridge Plug A = Size OD (") B = Length (")

0.750 Permanent Bridge Plug

0.750 10.80

0.875 Permanent Bridge Plug

0.875

11.20

1.12 Permanent Bridge Plug

1.1211.20
1.37 Permanent Bridge Plug 1.3712.21


Firing Heads

Depending on the wellbore specifications and the particular slickline application, the system is assembled with either a jar down firing head or a pressure activated safety firing head.

Pressure Activated Safety Firing Head

The operator lowers the bridge plug into the well to the required depth. Wellbore hydrostatic is used in conjunction with pump pressure to determine the correct amount of shear pins to be placed in the pressure activated safety firing head. When the correct pressure is reached, the pins shear allowing the firing pin to strike the ignitor. The ignitor lights a fuel cell which starts the release of a slow burning gas. This pressure moves the piston in the setting tool upwards to set the permanent bridge plug within the coiled tubing. The grippers hold the bridge plug from sliding up and down the well, while the compressed elastomers form a sealing plug in the pipe. The shear stud in the bridge plug shears leaving the bridge plug in the coiled tubing. The bridge plug is nonretrievable.

A) Half a brass pin shears at 1050 psi.*
B) A full brass pin shears at 2100 psi.*

Jar Down Firing Head

The jar down firing head operates with mechanical force rather than pressure. A wireline tool string complete with weight bar and spang jars is attached to the setting tool. The operator runs to the required depth, and jars down onto the firing head shearing the pin and pushing the firing pin body to strike the ignitor. The ignitor lights a fuel cell and this starts the release of a slow burning gas. This in turn moves the piston in the setting tool upwards to set the permanent bridge plug within the pipe. The grippers hold the bridge plug from sliding up and down the well, while the compressed elastomers form a sealing plug in the pipe. The shear stud in the bridge plug shears leaving the bridge plug in the coiled tubing. The bridge plug is non-retrievable.
 
Specifications
 

Permanent Miniature Bridge Plugs

Plug
Setting Range
Min O.D. (")
Wireline
Setting
Tool (")
Setting
Sleeve (")
Setting
Force
(lbs)
HSN PackingViton Packing
 
Min (")
Max (")
0.750
Bridge
Plug
PBP-0750-325
PBP-0650-325
PBP-0750-350
PBP-0650-350
0.750 0.875See Note 0.7500.7502000
0.875
Bridge
Plug
PBP-0875-325 PBP-0875-3500.8751.0001.2500.8750.8752000
1.12
Bridge
Plug
PBP-1120-325 PBP-1120-3501.1201.2501.5000.8751.122000
1.37
Bridge
Plug
PBP-1370-325 PBP-1370-350 1.3701.5001.750.875 1.372000

Note: 0.750 Plugs must be specified on a per job basis in accordance with coil tubing size and wall thickness because of tolerance limits. Various Elastomers sizes on request


 

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