TBC-BRINADD Fluid Systems
    Brigdesal-Ultra System



Design & Application

  Salt Systems
  Oil Soluble Resins

Products Info
  Bridgesal -Ultra
  Thixsal-Ultra
  Hysal
  PBS Plug
  Safety Data

Application & Mixture
  Sealing & Curing losses
  Seal Application
  Drill & Remove fill
  Change of ESP
 Salt Systems
  up to 250°F
  up to 265°F
  up to 275°F
  up to 290°F
  up to 305°F
  Curing losses after Frac Job
  Mill / Fish
 Oil Soluble
  OSS Pill
  OSS Pill & Solubridge

 

Drill and Remove Fill and Seal Formation at Perforations


Well Data example
:
payzone depth +/- 6500 ft tvd
formation pressure 0.50 psi
perforated section 50 ft of 7" liner
rathole +/- 400 ft
length of sand fill +/- 500 ft
bottom hole temp < then 250°F
permeability < then 2 darcies

The 7" wellbore is filled with sand with about 100 ft above perforated section. A fluid system is required to drill out the fill and temporarily seal the perforations as the drill bit passes them. The well volume is +/- 245 bbls. need to mix at surface for circulation +/- 350 bbls - 400 bbls.
A Bridgesal-Ultra fluid system at 10.4 ppg containing sized salt bridging material in the range of 1-75 micro will efficiently seal the formation and possess excellent rheology to remove the sand fill.

The same formulation has been used on a number of similar applications in the North Sea for Shell-Bp-Amoco, Mobil, Statoil in Norway. All these wells were successfully removed of fill with the perforations sealed and no loss of fluid to the formations. All the wells were subsequently cleaned up and production recommenced.
{ Bridgesal-Ultra was used as a pill or as a circulating system as needed }

System Formulation:
Saturated NaCl brine @ 10.0 ppg 0.94 bbl
Defoam-2 0.35 lit/bbl
Bridgesal-Ultra 40.0 ppb
Ph-Buffer 1.0 ppb
Thixsal-Ultra 2.0 ppb


Pill formulation:
Saturated NaCl brine @ 10.0 ppg 0.89 bbl
Defoam-2 1/2 lit/bbl
Bridgesal-Ultra 60.0 ppb
Plugsal 40.0 ppb
Ph-Buffer 1.0 ppb
Thixsal-ultra as viscous carrier
ahead & behind total 20 bbls
6.0 ppb


Note: Due to depleted reservoir & or presence of vugs, the system itself may not seal losses completely, thus a pill as formulated above need to be mixed @ surface and displaced downhole to completely cure the losses & seal at formation face. The pill volume has to be calculated at 2 bbls for each ft of open perfs.
e.g.: for 50 ft of perfs, you need to mix & displace 100 bbls of pill.