Originally designed as an enhanced oil recovery (EOR) polymer, VIS HT has also proven effective in viscosity enhancement for high-temperature, high-density brine systems. Across a broad temperature range, VIS HT exhibits outstanding stability in all brine formulations and demonstrates excellent compatibility with bromide salts.
Primary Applications
1. High-Density Brine Systems
In drilling and production operations, high-temperature, high-pressure (HTHP) conditions often necessitate the use of weighted brine systems to counteract temperature-induced fluid thinning. However, achieving the required viscosity in such extreme high-temperature, high-salinity environments becomes increasingly challenging. Conventional polymers struggle to meet these demands, whereas VIS HT provides an effective solution.
2. Solids-Free Brine Drilling Fluids
Solids-free brine drilling fluids offer significant advantages, including:
- Superior wellbore pressure control
- Enhanced removal of drill cuttings and other debris
- Protection of reservoir productivity
When a high-stability, water-soluble polymer is successfully employed for brine viscosity enhancement, additional benefits are realized:
- Reduced friction pressure in coiled tubing operations
- Improved sand-carrying capacity
- Minimized formation damage through controlled fluid loss
Quality Standard
|
STT |
Specifications |
Unit |
Technical requirements |
|
1 |
Identification |
-- |
White to light yellow powder |
|
2 |
Viscometer reading at 600 rpm |
||
|
In tap water |
150-200 |
||
|
In brine 20 g/l NaCl, not less than |
30 |
||
|
3 |
Parameters after heating 150OC/16 hours in 8% KCl brine |
||
|
Va |
cp |
30-45 |
|
|
V6, not less than |
Lb/100ft2 |
10 |
|
|
Gel 1 minute, no less than |
Lb/100ft2 |
8 |
|
|
AIP fluid loss, not exceeding |
cm3 |
6 |
|
|
HTHP, not exceeding |
cm3 |
20 |
|
