ME-UHIB-DRIL
The Silicone-based Non-Dispersible Drilling Fluid System
&
Comparison with Other Systems
Additives and Dosage
|
Additives |
Dosage (kg·m³) |
|
ME-HIB (Silicone-based) Inhibitor |
5.0 |
|
ME-CAP (Polyacrylamide KPAM) Encapsulant |
3.1 |
|
ME-PacL (Ultra-Low Viscosity Poly-Anionic Cellulose) Fluid Loss Reducer |
8.3 |
|
MC VIS Viscosifier or Xantham Gum Rheology Modifier |
2.2 |
|
KCl Inhibitor |
30.0 |
|
LUBE167 Lubricant |
8.0 |
|
CARB-10/20/40 Calcium Carbonate |
12.7 |
|
ME-Poliseal Sulfonate Polymer |
33.0 |
Use Cases
Bohai Offshore Oilfield: Meets environmental protection requirements, ensuring no biotoxicity and complies with marine environmental protection standards.
Onshore Oilfield Mud Shale Formation: Suitable for complex shale formations, especially water-sensitive and easily collapsible shale layers.
Application
Suitable for formations with a depth of less than 3500m and a temperature not exceeding 150°C.
Suitable for relatively stable conventional pressure formations.
Suitable for clay and soft mudstone formations with strong slurry-making capabilities, able to achieve low solid-phase content and a lower drilling fluid density, which helps improve drilling speed.
Suitable for non-weighted drilling fluids.
Suitable for drilling operations with complete solid control equipment that can operate effectively.
Features
Low Density: This system has the characteristic of low density, resulting in small pressure differences and fast drilling speeds.
Low Submicron Particle Content: The submicron particle content of this system is less than 10%, whereas dispersed drilling fluids typically contain up to 70% submicron particles.
Low Viscosity at High Shear Rates: This system maintains low viscosity at high shear rates, helping to increase drilling speed.
Good Thixotropy and Shear Dilution: This system has strong sand-carrying capacity, good thixotropy, and high shear dilution ability.
Strong Encapsulation: The system uses high molecular polymers as the main treatment agent, offering strong encapsulation properties to maintain wellbore stability.
Protection of Oil and Gas Layers: The system has a low clay content and inhibits the swelling of clay minerals in the formation, which helps protect oil and gas layers. It enables near-balanced drilling and prevents drilling fluid damage to oil and gas layers.
Comparison with Other Systems
SLB-ULTRA-DRIL Water-Based Drilling Fluid System:
Equivalent to the ME-UHIB-DRIL Silicone-based Non-Dispersible Drilling Fluid System.
Coarse Dispersed Drilling Fluid System:
Can accommodate a higher amount of solids, suitable for high-density drilling fluids (density up to 2.0 g/cm³ and beyond).
The resulting mud cake is of excellent quality, dense and firm, with good wellbore stability. The high temperature and high pressure (HTHP) fluid loss and initial fluid loss are relatively low.
Strong temperature resistance, withstanding temperatures up to 200°C.
The submicron particle concentration is greater than 70%, which may affect drilling speed and wellbore stability.
Strong dispersion but weak inhibition, thus not suitable for drilling in slurry-forming formations.
Weaker protection for oil and gas layers, requiring modifications when drilling into these layers.
Dispersed Drilling Fluid System:
Suitable for deep wells with a depth greater than 4500 meters, and a well temperature range of 160-200°C.
Suitable for drilling fluids of various densities.
Can be used in abnormal pressure formations.
Not suitable for opening oil and gas layers, pure salt gypsum layers, or formations with severe wellbore instability.
Saltwater Drilling Fluid System:
Strong resistance to salt, calcium, and magnesium ions.
Excellent inhibition performance, slower slurry formation, and able to maintain lower solid-phase content.
The filtrate is similar to formation water, offering some protection to oil and gas layers.
Saturated Saltwater Drilling Fluid System:
Strong inhibition and excellent resistance to inorganic salt contamination.
Inhibits hydration and disintegration of water-sensitive clay shales, preventing formation collapse.
Prevents the dissolution of rock salt and avoids excessive expansion of the wellbore, primarily used in thick rock salt layers and complex salt gypsum formations.
KCl Drilling Fluid System:
Inhibits clay hydration and expansion primarily through potassium ions (K⁺), altering the properties of the drilling fluid.
K⁺ has a low hydration energy, stabilizing the wellbore and reducing damage to oil and gas layers.
Calcium-based Drilling Fluid System (Lignosulfonate + Lime):
Suitable for wells with a depth of approximately 3000 meters and moderate slurry formation in shallow formations.
Ca²⁺ inhibits clay dispersion, effectively reducing the impact of slurry-forming formations on drilling fluid properties.
Less sensitive to environmental conditions compared to freshwater drilling fluids.
Has certain calcium contamination resistance.
Can accommodate higher concentrations of solids, offering some wellbore stability.
Can be used with gypsum for drilling in pure gypsum layers.
Can be weighted to a higher density, suitable for high-pressure formations.
