DRILLING FLUID TEMPERATURE. CONTROL SYSTEM (DFTCS). HPHT mud
cooling solution protects tools, reduces NPT, enhances HSE ...
DRILLING FLUID TEMPERATURE CONTROL SYSTEM (DFTCS) HPHT mud cooling solution protects tools, reduces NPT, enhances HSE
DRILLING FLUID TEMPERATURE CONTROL SYSTEM: Reduce fluid losses and NPT while increasing rig safety
Compounding the issues of drilling HPHT wells, especially offshore, are the serious economic and HSE risks of an increasingly overheated drilling fluid. As the well deepens, higher temperatures and pressures collide with escalating mechanical forces to progressively heat up oil and water-base drilling fluids. When that happens, even drilling fluids specifically formulated for HPHT applications eventually reach their breaking point, resulting in a host of problems that can include fluid loss, reduced viscosity, stuck pipe and unstable filter cakes.
The DRILLING FLUID TEMPERATURE CONTROL SYSTEM† (DFTCS†) from M-I SWACO, a Schlumberger company, provides offshore operators a field-proven and cost-effective solution for maintaining the ideal mud temperature throughout the drilling of an HPHT well. By preventing the drilling fluid from overheating, the system reduces hole problems, safety risks and NPT, while prolonging the life of LWD and MWD tools and increasing confidence in the accuracy of acquired data.
Get more from your drilling-fluid system, downhole logging tools and rig equipment Features ■■
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Designed to constantly maintain optimal mud temperature Engineered with titanium plate heat exchangers Skid-mounted, ready for immediate operation Maximum temperature and pressure design capacities of 266°F (130°C) and 145 psi (8 bar), respectively
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Applicable for all types of drilling fluids
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Small footprint
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Does not require dedicated operator
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Designed for optimal serviceability
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Temperature kept below oil-based drilling fluid flash point Heat exchangers suitable for parallel or series when dual system is used Mud temperature controlled to maintain elastomer integrity
Benefits ■■ ■■
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Maintains drilling fluid efficiency Reduces need for mud conditioning additives Extends life of elastomer seals on BOP, MWD/LWD tools, riser, shakers, centrifuges and pumps Increases accuracy of downhole measurement devices Reduces mud-related downhole problems Eliminates noxious oil-based mud surface emissions Improves safety of HPHT drilling operation Reduces personnel requirements Avoids NPT risks of overheated drilling fluid Reduces drilling costs Less fumes released from drilling fluid which results in less overpower incidents on the HVAC systems
Likewise, excessive drilling fluid temperatures can destroy LWD, MWD and other critical downhole measuring devices or else raise serious doubts about the accuracy of the acquired data. While all this can lead to AFE-busting non-productive time (NPT), the potential economic hit pales in comparison with the HSE risks when a scalding drilling fluid destroys the elastomer sealing of the BOP and other critical components, not to mention the surface health hazards when an oil mud exceeds its flash point and releases noxious emissions. With our advanced offshore DRILLING FLUID TEMPERATURE CONTROL SYSTEM, M-I SWACO incorporates the very latest in heat exchanger technology to ensure you maintain optimum drilling fluid temperature throughout the well. Simple to install and ready for immediate operation, the skid-mounted DFTCS unit has become an indispensible offshore rig component. Throughout the world and in
numerous HPHT applications, the system has become a field-proven standard for transferring heat out of the drilling fluid and helping ensure the upmost in safety and drilling efficiency. The DFTCS unit uses counter-current flow to efficiently and quickly transfer excessive heat out of the drilling fluid to help maintain a stable rheological profile and reduce the costs of reconditioning additives otherwise required to sustain drilling efficiency. What’s more, constant mud temperature control means you no longer have to make an unplanned trip to pull an LWD, MWD or similar downhole measurement tool that was unable to function in an overheated mud system and failed prematurely. You also can be assured that acquired data had not been altered by the heat and rendered unreliable. Above all, the mud cooling system gives you another layer of safety in the drilling of an HPHT well.
Technical Specifications for the DRILLING FLUID TEMPERATURE CONTROL SYSTEM
Single DFTCS System Specifications ■■
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Dimensions –– Length: 3,616 mm –– Width: 1,500 mm –– Height: 2,500 mm –– Weight: 3,750 kg Design –– Design Pressure: 8 bar –– Design Temperature: 130°C –– Heat Transfer Area: 185 m2 –– Pressure Vessel Code: PED 97 / 23 / EC or ASME / API –– Frame: DNV 2.7-1 / 2.7-3 Operating Utilities –– Cooling Water Flow: 200m3/hr – Recommended Flow –– Drilling Fluid Flow: 200m3/hr – Recommended Flow
Dual DFTCS System Specifications ■■
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Dimensions –– Length: 6,971 mm –– Width: 1,500 mm –– Height: 2,500 mm –– Weight: 9,300 kg Design –– Design Pressure: 8 bar –– Design Temperature: 130°C –– Heat Transfer Area: 370 m2 –– Pressure Vessel Code: PED 97 / 23 / EC or ASME / API –– Frame: DNV 2.7-1 / 2.7-3 Operating Utilities –– Cooling Water Flow: 275m3/hr – Recommended Flow –– Drilling Fluid Flow: 275m3/hr – Recommended Flow
Field-tested, simple-to-operate system that packs tremendous benefits Designed specifically for the efficient transfer of heat from the drilling fluid system, the DFTCS unit continues to build on its impressive track record for reducing the risks and costs of constructing HPHT wells. The results may be extraordinary, but they come from a system that from installation to operation is engineered for simplicity: ■■
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The DFTCS unit is built around fieldproven titanium plate heat exchangers that are designed in accordance with applicable ASME or PED codes and standards
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Complete piping assembly with gauges and manually operated butterfly valves for product and cooling water The heat exchangers can be operated in parallel, dual system only. A centrifugal pump supplies drilling fluid from the clean fluid pit to the heat exchangers A suction strainer prevents large solids reaching the pump An incorporated back flush arrangement facilitates cleaning of the system
Designed to minimize weight and space requirements while ensuring maximum serviceability
Put the DRILLING FLUID TEMPERATURE CONTROL SYSTEM to work for you
Skid-mounted, requiring a simple connection for immediate operation, typically in less than 24 hours
To find out more about how our DRILLING FLUID TEMPERATURE CONTROL SYSTEM is reducing the risks and costs of our other customers worldwide, contact your local M-I SWACO representative.
The DRILLING FLUID TEMPERATURE CONTROL SYSTEM proves itself in the field North Sea: DFTCS keeps heat off 5-well package The Situation The operator was using the WARP† oilbase drilling fluid in a five-well project that included one of the highest pressured wells ever drilled in the North Sea
The Solution To ensure the fluid system did not overheat during the drilling program and cause downhole issues, the operator installed the DRILLING FLUID TEMPERATURE CONTROL SYSTEM.
The Results The system clearly demonstrated its mud cooling efficiency, on average cooling the WARP oil-based drilling fluid from 162° F (72°C) to 131° F (56°C), with heat reductions as high as 77°F (25°C). At times, only half of the unit was required to deliver efficient mud temperature control.
Red Sea: DRILLING FLUID TEMPERATURE CONTROL system reduces temperature The Situation Operations in the Red Sea with a TD ± 13,800 ft and BHT of ± 330 °F, predicted flow line temperatures in excess of 220 °F when drilling the 6” hole interval. These temperatures create an HSE concern since they can reach the flash points of the oil based drilling fluid being used. Additionally, when exposed to these temperatures, the MWD and LWG tools are at risk of experiencing hole problems due to increased thermal stress.
The Solution The DRILLING FLUID TEMPERATURE CONTROL SYSTEM is skid mounted and incorporates a single or dual plate heat exchanger designed in accordance with ASME codes and standards. The system includes a complete piping assembly, gauges and manually operated butterfly valves for drilling fluid and cooling water. The use of the drilling fluid temperature control system provides a high thermal efficiency on a very small foot print; it can be easily opened for inspection and maintenance and includes titanium plates to eliminate the risk of corrosion.
The Results The DFCTS unit worked very effectively on the 6” hole interval drilled from 11,900 ft to 12,800 ft with 9.5 ppg – 9.6 ppg at a flow rate of 250 gpm to 400 gpm. The reduction in flow line temperature was estimated to be ± 20 °F (16 °C), from 129 °F to 109 °F. The reduction in the MWD temperature at BHT was estimated to be ± 45 °F (from 280 °F to ± 230 °F). A significant increase in the flow line and inlet drilling fluid temperature was observed when the DFTCS was turned off for several hours in order to establish its performance. Additionally, the use of the DFTCS unit significantly improves the working environment on the rig floor, the shaker house and mud pit room due to less evaporation rates and heat emissions indicated.
This information is supplied solely for informational purposes and M-I SWACO makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.
© 2014 M-I L.L.C. All rights reserved. †Mark of M-I L.L.C. DBR.0316.1407.R4 (E) Digital Print in U.S.A.
