In a traditional reaming-while-drilling BHA the reamer is placed above the RSS and LWD tools, creating a long rathole and requiring an extra trip to enlarge the hole to TD. Challenged to design a tool to increase efficiency, Halliburton has responded with a solution that has the added benefits of optimized steerability and fluid flow, and reduced tool length based on the proven reliability of the NBR? reamer technology. Run in conjunction with a traditional reamer, TDReam? tool is Halliburton’s newest downhole innovation designed to significantly reduce rathole length and reach TD in one run.
Challenges and Solutions
Challenge
Save rig time
-Standard RSS reaming BHA leaves long rathole that requires an extra trip to enlarge
-Requirement from customer is a max rathole length of 20 ft
Solution
TDReam Tool
-Integrated reamer placed between bit and RSS.
-TDReam? tool is dormant during drilling of the section and activated to enlarge the rathole.
-Rathole is reduced to <3 feet without extra trip.
Challenge
Excessive rathole length
In traditional reaming-while-drilling bottomhole assemblies (BHA), the reamer is placed above the RSS and logging-while-drilling (LWD) tools, creating a long rathole and requiring an extra trip to enlarge the hole to TD.
Solution
Rathole reduction with optimum steerability
The rugged TDReam? tool is positioned between the drill bit and the RSS, enabling the rathole length to be reduced to less than 3 feet without requiring an extra trip. The tool remains dormant during drilling of the section without sacrificing precise steerability of the RSS. The tool is activated at TD to enlarge the rathole left below the reamer.
Challenge
Improve operational efficiency
Depending on the well depth, when an operator has to pull a string and trip in a dedicated reaming/cleanout run, significant rig time and costs can occur against the production value of the well.
Solution
Rig time savings
This innovative Halliburton solution achieved all operator objectives that not only saved rig time but also reduced rathole length while enabling the liner to be run in the last 50 feet of hole. In this case, the operator deployed both the TDReam? and XR tools in combination, time savings resulted in an estimated $300,000 savings to the customer.
TDReam tool is based on the field proven NBR reamer technology
Hydraulic shear pins are used to maintain the TDReam? tool in a dormant position during the drilling of the section. A minimal increase in internal pressure breaks the shear pins and forces the pistons to move radially. A pressure drop through the bit maintains the tool in the open position while the return springs close the pistons when flow decreases.
MaxBHA software provides state-of-the-art steerability
The diameter and length of the TDReam? Tool helps ensure optimal steerability. Halliburton’s MaxBHA? software models BHA behavior and steerability, improving well placement, drilling performance, and tool reliability.
Bit/reamer hydraulics have been optimized to improve tool cleaning efficiency
Extensive computational fluid dynamics (CFD) enhance bit/reamer hydraulics for improved tool-cleaning efficiency. No hydraulics are compromised from the internal workings of the tools. SelectCutter? PDC Technology includes abrasion resistance that enables cutters to stay sharper longer and deteriorate slower than other cutters, producing more footage and higher rates of penetration (ROP).
SelectCutter PDC technology
Proper selection of cutting structure and tool sizes can save valuable rig time and reduce trips. Consult your Halliburton representative, who will work with an Application Design Evaluation (ADE SM ) service specialist to consider a variety of application specific factors such as; formation, cutter layout, density and size, and hydraulic and gauge configuration.
Halliburton offers a premium cutter option for TDReam? tool featuring advanced cutter technology with three primary drivers of cutter performance:
- Abrasion Resistance helps ensure that cutters maintain a sharp edge by keeping the diamond loss low.
- Impact Resistance keeps the cutter from failing due to dynamic forces and vibrations under normal drilling conditions.
- Thermal Mechanical Integrity? works to remove heat generated from friction to ensure that the diamond to diamond bonds do not break down.
Save time, save money, work safer, with TDReam
TDReam Tool is Halliburton’s revolutionary, award-winning solution that changes reaming for the better without changing the overall operational procedure, equipment, or real-estate associated with standard drilling. TDReam? operates in conjunction with an XR? Reamer. It’s placed above the bit and between the rotary steerable system to reduce rathole length to less than 3 ft. and reach TD in one run. No second reaming run is ever needed. Therefore, costs go down and safety goes up with less pipe handling required.
Application
Norway: Successfully enlarged wellbore from 12 1/4 in. to 13 1/2 in.
Halliburton TDR1200 tool in combination with the XR? Reamer delivers a one-trip solution for borehole enlargement to TD.
Successfully enlarged the rathole to enable the running of a 10 3/4-in. casing to TD
Estimated cost savings of $300,000 in rig time alone for the operator
Conclusion
The TDReam tool is activated once it reaches total depth to enlarge the rathole left beneath the reamer. This service allows casing and cementing operations to be performed without the need for a dedicated rathole cleanout beforehand. At a spread rate of $900 per minute, the cost of an extra trip could run up to $2 million using a traditional reamer. The TDReam tool saves time and money, and reduces the risks inherent with multiple trips down hole and pipe handling operations at the surface.
Francisco Tarazona, vice president, Halliburton Drill Bits & Services noted, “The TDReam? tool is a unique technology solution for challenges related to rathole length. It eliminates the need for a dedicated rathole drill and cleanout, reduces Equivalent Circulating Density and lessens the risk of cement contamination.”
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