Results & benefits
One string: DualPipe drilling system is developed to overcome common drilling challenges.
Two pipes: The dual-channel configuration is unique, allowing drilling fluid to be pumped down from the annulus, between the concentric pipes in the string, and through the drillbit. An inner pipe valve just above the BHA allows the drilling fluid and cuttings to be returned to the surface at a higher velocity than usual within the central pipe.
Three results: Zero ECD, Cuttings Free Wellbore, and Increased Reservoir Access
The concentric design of DualPipe enables control of system pressure to maintain a static gradient in the wellbore while circulating fluid through the bit. The elimination of ECD-related pressure fluctuations minimises the risks of wellbore instability and massive lost circulation.
DualPipe’s pressure management capability utilises less expensive drilling fluid. Buoyancy effects, using the patented “Heavy Over Light” fluid solution, significantly reduces the torque and drag of the drill string, which further reduces wear and aids the horizontal reach capability.
Low energy drilling is possible with the pressure gradient in the open hole section held constant and independent of the drilling fluid flow rate.
Reduces cost and risk of massive drilling fluid losses
Allows longer sections with narrow pressure windows
Increases pressure margins at greater depths
Enhances wellbore pressure management ability
Cuttings free wellbore
DualPipe removes drill cuttings from the wellbore just above the BHA and transports them back to the surface via the inner pipe. The result is a clean hole, with minimal flow in the annulus at all times.
The reduction of cuttings build-up in the well, significantly reduces the risk of a stuck pipe. The stable pressure regime and low flow rates, reduce the risk of hole collapse and washouts.
With cuttings being returned to surface inside the drill string, the need for rotation to support hole cleaning is removed. As a result, DualPipe can operate with low-drill string rotation speeds, which contributes to low energy drilling.
Provides superior hole cleaning in horizontal wells
Eliminates the accumulation of cuttings beds
Enables low energy drilling and reduced drill string fatigue
Reduces risk of stuck pipe, wellbore pack-off and wash-outs
Increased reservoir access
DualPipe enables operators to drill longer sections while remaining within a narrow pressure window.
In addition to increasing the length of reservoir exposed to production by an individual well, the increased reach opens up the possibility of accessing greater areas of the field from fewer surface locations.
DualPipe returns all cuttings to surface, thereby reducing the cost of remedial hole conditioning. The cuttings improve the quality of formation evaluation, since damage caused by grinding between pipe and borehole wall is dramatically reduced.
Enables precise formation evaluation from drill cuttings
Enables longer sections in reservoir
Reduces number of casing strings required
Reduces well count and number of surface facilities