|THUSLICK gives drilling operators the same peace of mind that oil-base muds bring without the environmental concerns. THUSLICK is also hydrocarbon free. The additive is currently used in well known and proven water-base systems particularly to improve and optimize their lubrication and physical shale protection abilities thus minimizing down hole problems. This unique, proven additive is compatible with all known mud systems including glycol, synthetic, oil-base and brine. It is also successfully used for completion/workover and coiled tubing operations.|
|||Optimizes lubrication, especially at higher temperatures.|
|||Inhibits hydration of the clay fraction in shale and claystone.|
|||Reduces wellbore damage, especially vibration induced formation damage resulting from the stick-slip phenomenon.|
|||Stabilizes rheological properties, leading to greater hole efficiency.|
|||Stabilizes HTHP filtrate values, by reducing polymer breakdown.|
| THUSLICK is unique as a single mud additive providing all these benefits to the mud.|
| Environmentally safe, HOCNS rating for use in the North Sea and LC50 for the Gulf Coast.|
| Field proven in drilling operations in the North Sea, United States, Europe, Africa, Asia and Canada.|
| Technical support is available globally to mud companies and O&G operators.|
| The inhibition
properties of oil base muds are superior to those of water base muds, but adverse
environmental impacts are greater. Water base mud systems with hydrocarbon based additives
have poorer performance characteristics than oil based systems.
Water based system additives frequently do not perform in harmony. Also environmental consequences may be undesirable. THUSLICK harmonizes other mud additives giving a stable drilling fluid. THUSLICK upgrades polymer systems for use in demanding drilling conditions otherwise best tackled with an oil base mud.
|THUSLICK - WHAT YOU CAN EXPECT||TOP|
|THUSLICK - COST EFFECTIVENESS||TOP|
When evaluating the overall cost
effectiveness of THUSLICK
Large well-cost savings in places where water-base mud with THUSLICK can be used instead of oil-base mud, thereby eliminating Environmental Compliance costs.
THUSLICK is non-toxic, non-combustible and contains no heavy metals or
environmentally hazardous chemicals.
HTHP Filtrate Loss Control
THUSLlCK - The Winning Edge
|GENERAL TREATMENT RATE||TOP|
THUSLICK may be added at 3 minutes per 25 kg bag. The product is easily dispersed
and may be added via a hopper directly into the active system or through pre-mixing.
Treatment - To Improve Lubrication (Whole Interval)
Treatment - Brittle Formation
|Field experience has shown that a treatment of 6 ppb (17.1 kg/m3) to be effective in reducing torque and drag due to brittle formations (pressurized shales, coal, tectonically stressed rocks).|
Treatment - Physical Clay Inhibition
| Use the same
concentration as indicated under 'Treatment-To Improve Lubrication".
Using downhole dynamics THUSLICK physically coats and smears
the formation with water repellent micro fine particles.
No chemical stabilization of the clay bearing formation occurs,
it is purely a physical protection mechanism.
Treatment - While Drilling
|If hole problems exist before THUSLICK is added to the mud system it is better to start with a high concentration to drift down so long as desired effects are maintained. Good field engineering will dictate the amount to be added thereafter. all factors should be considered i.e. dilution rates, solids control equipment, new hole and severity of problem. For lubricity the engineer on location should calculate the torque and drag values suitable to the situation and adjust concentration accordingly.|
THUSLICK will work without fail for all purposes shown above -
Vertical, deviated, horizontal, dog-legged and tectonically stressed holes
have all been helped by THUSLICK.
Treatment - Maintenance
| Daily addition of
between 0.35 and 0.7 ppb (1-2kg/m3) should be made. The concentration can be controlled by
measuring the HTHP filtrate values, whenever they increase THUSLICK should be added.
The temperature stability of THUSLICK is in excess of 1,000o F (550o
|THUSLICK - HOW IT OPERATES||TOP|
| THUSLICK is a
micronized siliconized PDMS coated plumbago powder having a very low surface tension (+/-
20 Dynes/cm), making it water repellent (Water is about 75 Dynes/cm and oil is around 25
Dynes/cm). The concept is based on using the difference in surface tension between
surfaces (water wet/water repellent) to obtain lubricity and (physical) shale
stabilization When using water-based mud the formation, casing and drillstring is
predominantly water wet and may adhere together upon contact.
The THUSLICK particles, once dispersed in a mud system, produce greatly reduced surface tension between the predominantly water wet surfaces downhole.
The THUSLICK micro-fine particles physically impregnate and coat the wellbore forming a thin, and extremely slick layer. The water repellent nature of this thin slick layer of particles in the filter cake creates an environment of reduced water absorption by clay bearing formations (where formation permeability exists). The particles consequently also coat the drilled (clay) solids, isolating the water from the clay minerals, THUSLICK lubrication function reduces torque and drag leading to better transmission of weight to the bit hence improved penetration rates.
Tripping, logging and casing run times are also improved. The thin slick THUSLlCK filter cake significantly reduces "stick-slip" phenomenon allowing a more constant bit RPM thus extending bit life and reducing the number of trips. The THUSLICK slippery powder coating on metal and rock surfaces reduces vibration thereby limiting wellbore damage in brittle formations such as coal, tectonically stressed 'hard rock' and shales.
THUSLICK is a medium-low pressure lubricant which does not reduce bit cutter efficiency as high pressure liquid lubricants may do. Lubrication at high temperatures is significantly better than that of asphalt, bitumen and Gilsonite. Although liquid lubricants act more quickly, their overall benefit to an operation may be limited While THUSLICK may be slower acting it is a more dynamic and lasting product. For this reason it should be added at the beginning of a section and not once problems have already developed. The resulting hole drilled is in better gauge and less mud volume is required to drill a section.
THUSLICK has been successfully tested for stability to 200 o C and in fact maintains its properties in excess of 500 o C, THUSLICK is compatible with and enhances Polyalkylene Glycol systems. At temperatures above cloud point THUSLlCK tends to accumulate the water insoluble glycol and to disperse it evenly Adding THUSLICK to a polymer system reduces polymer consumption Polymer breakdown (oxidation) at higher temperature is also reduced as the micronized dispersed air is no longer present.
THUSLICK has a strong de-foaming action which stabilizes viscosity and gels to improve hole cleaning. Also THUSLICK reduces entrained air and thereby reduces corrosion. Significant corrosion reduction has been demonstrated through testing :with Kci Gypsum mud (80 gm/liter Kci) and with mild steels in saline mud.
With THUSLICK high temperature, high pressure losses are reduced, and low filtrate values result without affecting rheology.
Note: Fluid loss control is necessary to reduce initial spurt loss.
Formation damage using THUSLICK is no greater than that of Sentonite/PAC polymer mud Systems. Also, no return permeability damage was seen in special core tests, in contrast to experience with some liquid lubricants and additives.
Because it is hydrocarbon free; THUSLlCK has no geological evaluation inconvenience, i.e. no fluorescence.
THUSLICK in water base mud does not have the characteristic an oil base mud exhibits detracting from and complicating well control and kick detection.