The Benefits Blog Series: The Benefits of No Coil Tubing and the SC Bowhead II Sliding Sleeve System
The SC Bowhead II system eliminates the need for coiled tubing. In addition to avoiding coiled tubing costs, the callout and location time associated with coiled tubing operations is negated and translates to the bottom line as a pure cost savings. Coiled tubing deployed systems require the coil to remain in the wellbore during stimulation operations. The full bore flow area of the casing ID is reduced by the cross sectional area of the coiled tubing string in the hole. The resultant net stimulation flow area is the annular area between the outside of the coiled tubing and the inside of the casing. This reduced flow area increases friction pressure and can limit pump rates at a given horsepower or alternatively require additional horsepower to achieve desired stimulation pump rates. The SC Bowhead II eliminates the time required for the coiled tubing to move from stage to stage, set the packer, and then engage the sleeve.
The SC Bowhead II system utilizes a larger constant ID throughout. This provides the maximum flow area possible from the surface down to the opened sleeve at the point of formation stimulation during pumping operations. This reduces friction pressure as compared to coiled tubing operations and results in reducing horsepower requirements and associated costs and allows for much higher pump rates if desired.
The coiled tubing itself generates friction as it engages the casing wall. Eventually this limits the effective reach of coiled tubing into lateral sections. Coil activated systems are likewise limited by the length of coiled tubing reach. The SC Bowhead II is not limited by mechanical reach limitations as it utilizes a simple system of pumping a collet/dissolvable ball assembly downhole to engage a matching sliding sleeve profile.