DRILL-IN FLUIDS
BRINEDRIL-N® Drill-In Fluids
BRINEDRIL-N® High Density Brine-Based Drill-In Fluids
Benefits
• Non-damaging to the reservoir
• Can ensure wellbore stability and effective hole cleaning
• Provides exceptional rheological, suspension, and
fluid-loss characteristics
Berea Sandstone Core
90
80
70
60
50
40
Start Return Flow
30
20
100% RTN Perm
10
0
0.0
0.2
0.4
0.6
0.8
1.0
CUMULATIVE INJECTION, PORE VOLUMES
HAL18845
Overview
The BRINEDRIL-N® system is one of the fluid systems within
Baroid’s DRIL-N™ fluids family. It is a high-density, brine-based
polymer system specifically designed for drilling, completion, and
workover operations. The BRINEDRIL-N system contains carefully
formulated polymers that provide exceptional rheological,
suspension, and fluid-loss characteristics in a nondamaging,
thermally-stable fluid. In addition, carefully sized BARACARB®
bridging agent can be added to promote a thin, low-permeability
filter cake for drilling permeable formations.
Return Permeability
Return permeability studies have consistently shown greater than
85% return permeability.
PERMEABILITY, MD
Challenge
Foreign particle invasion and plugging, formation clay dispersion
and migration, chemically incompatible fluids, and fluid invasion
are all potential causes of formation damage that, if not addressed,
can lead to lost circulation, wellbore stability issues, and ultimately,
decreased production.
Particle Size Distribution Selection
The bridging material in the BRINEDRIL-N system can be
customized using Baroid's DFG™ modeling software for selecting
the proper particle size distribution for the reservoir rock average
pore throat size. This custom sizing capability minimizes particle
invasion and fluid loss to the producing formation.
• Enables fast penetration rates
• Easy to prepare and maintain the required density with clear
brine or dry salts
• Formulations can be customized for specific reservoir
conditions, pilot-tested in the laboratories, then recommended
for the field applications
• Helps increase production rates
HAL18846
Features
The BRINEDRIL-N system is a heavy brine fluid system utilizing
water-soluble salts such as potassium chloride, sodium chloride,
sodium bromide, calcium chloride, calcium bromide, zinc
bromide, or sodium, potassium and cesium formate brines.
• Densities ranging from 9.5 to 18.0 lb/gal (1,138 to 2,157 kg/m3)
• Exhibits unique high-shear viscosities at low-shear rates and
shear-thinning capabilities
• Superior lubricating characteristics
The above displays the particle size distribution of the BARACARB®
bridging material that can be used in the BARADRIL-N system
DRILL-IN FLUIDS
14.4 lb/gal (1,726 kg/m3) BRINEDRIL-N System
Formulation and Order of Addition
14.0 lb/gal (1,678 kg/m 3) (CaCl2/CaBr2 brine)**, bbl
Value
0.947
0.947
BDF-299 additive, lb / kg
0.3 / 0.14
0.3 / 0.14
N-DRIL™ HT PLUS filtration control agent, lb / kg
6.0 / 2.72
6.0 / 2.72
BARABUF® pH stabilizer, lb / kg
3.0 / 1.36
3.0 / 1.36
BARACARB® 5 bridging agent, lb / kg
15.0 / 6.80
15.0 / 6.80
BARACARB 25 bridging agent, lb / kg
17.5 / 7.94
17.5 / 7.94
BARACARB 50 bridging agent, lb / kg
17.5 / 7.94
17.5 / 7.94
OXYGON™ oxygen scavenger, lb / kg
1.0 / 0.45
1.0 / 0.45
--
16
Hot-Rolled, hr @ 250°F / 121°C, 200 psi / 1.38 MPa N2 pressure
Restirred, minutes
--
5
14.4 / 1,726
14.4 / 1,726
Temperature, °F / °C
120 / 49
120 / 49
Plastic viscosity, cP
26
36
Yield point, lb/100 ft 2
24
14
2
6
7
10 Min gel, lb/100 ft 2
8
9
7.2
7.2
Density, lb/gal / kg/m 3
10 Sec gel, lb/100 ft
pH
HPHT on 10 µm disk, 250°F / 121°C, spurt, mL
Total volume, mL
Cake Thickness, 32nds of an inch
0.7
10.7
1
** Brine : 0.923 bbl (14.2 lb/gal) CaBr2 + 0.077 bbl (11.6 lb/gal) CaCl2
Conclusion
Carefully formulated with exceptional rheological, suspension,
and fluid-loss properties, BRINEDRIL-N drill-in fluids are
highly effective in drilling, completion, and workover operations.
The high-density fluids help ensure wellbore integrity and
well control as well as optimal production rates.
In addition, BRINEDRIL-N fluids are customized based on the
reservoir’s specific conditions for optimal results.
For optimum performance, BRINEDRIL-N drill-in fluid is
recommended to be followed by a breaker treatment, such as
Baroid’s N-FLOW™ filter cake breaker.
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H09163 4/12
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