Baker Hughes introduced its NSURE invert-emulsion-drilling-fluid system designed to address offshore and highrisk drilling operations better through its ability to exhibit an enhanced constant rheological profile across a range of temperatures and conditions. Compared with conventional systems in which the fluid’s viscosity is dependent on temperature, NSURE retains constant and predictable properties across a wider range of temperatures.
Introduction
We’re in the forefront of developing synthetic-based compliant emulsion systems for drilling in your challenging downhole conditions—such as deepwater and HP/HT. And, we make sure these new muds will meet the industry’s stringent environmental requirements.
The development of our unique mud additives was driven by the extreme HP/HT environment associated with Deep Shelf drilling in the Gulf of Mexico and the deviated HP/HT wells drilled in the North Sea. Laboratory testing demonstrates our fluid’s stability at temperatures in excess of 500°F [260 deg. C] and pressures exceeding 30,000 psi.
The Baker Hughes NSURE™ invert emulsion drilling fluid system exhibits constant rheology in challenging pressure-critical applications and sensitive offshore environments.
The NSURE system has the ability to bring greater control to fluid properties such as plastic viscosity, yield point, and gel strength across a wide range of densities, base oils, oil/water ratios, and contamination conditions. NSURE’s controlled rheology results in fluid properties ideal for better cement placement and reduces the risk of channeling while pumping. The controlled rheological properties also contribute to the ability to lower equivalent circulating densities, reducing pressure spikes when initiating circulation and ultimately taking pressure off the formation. This reduces the risk of fracturing the formation that could lead to lost circulation and nonproductive time. The NSURE system is also environmentally compliant across multiple markets worldwide.
Reduce the risk of lost-circulation events and ensure zonal isolation in offshore environments
Unpredictable offshore environments require a versatile drilling fluid that provides excellent wellbore stability while effectively controlling equivalent circulating density and surge pressure effects.
Conventional oil-based fluid systems thicken at low temperatures, increasing pressure surges and creating increased equivalent circulating densities (ECDs) during drilling. This may, in turn, induce fractures and create lost circulation zones that can affect the quality of your subsequent cement job, jeopardizing zonal isolation.
The constant rheology of the Baker Hughes NSURE™ invert emulsion fluid provides excellent drilling, casing, and cementing properties regardless of temperature variations and water depth.
In the warmer sections of a well, conventional systems may have inadequate viscosity for optimal hole cleaning or even experience a loss of suspension properties, resulting in barite sag and compromised static density.
This can lead to problems such as stuck pipe, lost circulation, wellbore instability, or well-control events.
Because of the shortcomings in conventional systems, the operator is often forced to choose between a fluid designed for colder temperatures and one designed for higher temperatures, even though both conditions may exist in the wellbore.
The NSURE system’s innovative chemistry and easy-break gel structure ensures a flexible, highly robust, and stable fluid that provides excellent drilling, casing, and cementing properties across changing pressures, temperatures, and water depths. This significantly reduces the risk of induced fractures, resulting in a reduced risk of mud losses, nonproductive time (NPT), and their associated costs. The balanced hydraulic profile of the NSURE system also improves the fluid’s hole-cleaning ability while adding flexibility to the operator’s well design and drilling program.
The NSURE system is defined by ratios that measure and evaluate the system’s fluid properties in a variety of temperatures. This quantitative approach to measuring the fluid’s reaction to temperatures ensures reliable performance across changing temperatures and drilling conditions. In addition to these stringently defined performance targets, the NSURE system does so using several common base oils and with components that meet or exceed global standards of health, safety, and environmental (HSE) performance.
Features and benefits
Reduced viscosity in cold temperatures and during prolonged static conditions; reduces pressure on the formation when circulating; reduces the risk of fractures, mud losses, NPT, and associated costs; reduces downhole surge pressures and ECD; preserves wellbore integrity; improves zonal isolation and enables better cement placement; decreases the time needed to run casing.
Balanced hydraulics while drilling; improves hole cleaning; reduces the risk of barite sag and subsequent well-control events; brings flexibility to well designs and drilling programs.
Norway yellow environmental rating, no substitution warnings in the UK, and compliant with Gulf of Mexico regulations; meets or exceeds global standards of HSE performance.
Applications
Pressure-critical applications
Environmentally sensitive offshore environments
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