Coil Tubing Technology Offers Great Efficiency in Fracking

Coil Tubing: How It Works

The isolation device is run on coil tubing and set in the lowermost sleeve of the well. When the isolation device is set inside the sleeve, it isolates pressure from above and below the sleeve, said Willems. The sleeve is opened with a combination of coiled tubing, set down weight and applied pressure. The frac is normally placed by pumping own the coiled tubing-casing annulus. After the frac is precisely placed, the isolation device is pulled up the well and set inside the next sleeve. When the tools are set, it is isolating all the wellbore below.

“We are pinpoint fracking the reservoir at each individual sleeve,” Willems explained. “Every interval is individually and precisely fracked.”

Conventional plug-and-perf and ball drop completions are commonly fracking multiple intervals at the same time, so there is far less control where the fracs are placed in the wellbore, said Willems.

“We can run our system in cemented or non-cemented wellbores. We have a lot of data that shows we have excellent isolation between frac stages in cemented wellbores.”

Other drawbacks of using plug-and-perf and ball-drop technology is the high cost associated with plug-and-perf for five or six clusters of stages, and the need to use incrementally larger balls, which limits the number of stages you can do, Williford told Rigzone.

One of the key features on using coil while fracking is the ability to circulate fluids.

“For instance, if a stage is requiring acid for breakdown, the acid can be circulated down the coil while taking returns at surface. The benefits derived from circulating is saving of time and precious water.”

Screen-outs can cause some serious inefficiencies and downtime if operators are utilizing plug-and-perf or ball drop completions. While screen-outs can’t be prevented, NCS’ technology can cut down on the number of screen-outs that occur.


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