Clear brines for high pressure wells TZHG

TU 2458-036-53501222-2012

High density brines TZhG are used to perform non-damaging killing of the wells for maintenance and repair works in high pressure wells. They are also used as high density process fluids in drilling.

Clear brines TZhG are ready-to-use brines and they may be calcium based and calcium-free. High density clear brines TZhG do not contain solids. TZhG contain a special complex of surfactants, corrosion and scale inhibitors that provide non-damaging effect on the formation.

Clear brines TZhG are available in several grades and may be of non-winterized (L) and winterized (Z) formulation. Below density range in g/cm3 for the grade is shown.

TZhG-
1,3   
TZhG-
1,4(L)  
TZhG-
1,4 (Z) 
TZhG-
1,5 (L) 
TZhG-
1,5 (Z) 
TZhG-
1,6 (L) 
TZhG-
1,6 (Z) 
TZhG-
1,8 (L) 
TZhG-
1,8 (Z) 
TZhG-
1,8 (B)
TZhG-
2,0   
TZhG-
2,0 (B)   
1.18-
1.32 
1.33-
1.45
1.33-
1.45
1.46-
1.54
1.46-
1.54
1.55-
1.6
1.55-
1.62
1.79-
1.82
1.79-
1.82
1.60-
1.80
1.95-
2.10
1.80-
2.25

Product Properties

  • TZhG are transparent liquids with color varying from colorless to light yellow or light-drown.
  • Depending on the grade TZhG may be calcium-based and calcium-free products.
  • Depending on the grade the density of TZhG varies within the range of 1.3 to 2.2 g/cm(10.85 – 18.36 ppg).
  • TZhG are clear brines with suspended solids content of not more than 100 ppm.
  • Freezing point for winterized forms is < minus 45 0C.
  • The brines have high surface activity. Interfacial tension in the oil-brine interface zone is 0.09-0.15 mN/m. Destruction of oil-in-water emulsions due to low interfacial tension at oil-fluid border.
  • Due to their high surface activity clear brines TZhG prevent water-oil emulsion forming and facilitates destruction of the emulsions formed in the reservoir. See the table below.

 
 Density of oil,
 g/cm3
Viscosity of oil,
 mPa•s 
Viscosity of water-oil
emulsion, mPa•s 
Viscosity of emulsion with 
thickened brine solution 
of ρ=1,2 g/cm3, mPa•s 
Viscosity of upper layer 
after the emulsion is 
treated with TZhG, mPa•s 
0.854  22.9 290 1580 37.5
0.850  12.3* 96.5 2200 15.2*


* Test at 50°C

  • TZhG are low corrosive (under 0.12mm/year an 20°C).
Advantages of Use 
  • Provide non-damaging killing operations, eliminating oil losses connected with a long period of resumption of stable output of the wells after maintenance.
  • Preserve filtration-volumetric characteristics of reservoirs.Increases oil yield and well productivity factor by breaking oil-water emulsions and providing improved filtration characteristics of reservoir.
  • Don’t affect clays in the rock.
  • No negative effect on oil treatment.
  • Low corrosion effect for the equipment.
  • Ecologically friendly.

Changing of current water-saturation of core samples of Zapadno-Nojabrkoye field at the simulation of multiple killing of a well

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Application of TZhG at maintenance and repair works on the wells with abnormally high reservoir pressure facilitates the improving of filtration-volumetric characteristics of reservoirs and facilitates performing repair works with due quality. 

Process Technique

High density clear brines TZhG are applied according to normative documents regulating killing process for maintenance and repair works. The consumption of TZhG depends on the conditions of each particular well.

To calculate the consumption of TZhG brines and select the optimal grade of the product contacy the specialists of Sales & Service Department of Polyex. 

Packing

TZhG is delivered ready for the application.

TZhG is delivered in PE containers with the capacity of 1 m3 or in specialized railway cisterns.

High density clear brine fluids TZhG are certified for application in oil-and-gas field.

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