"well deep into" is correct and usable in written English.
You can use it to emphasize how far into something you have gone - e.g. "I have read well deep into this book and I'm still not finished."
HASKELL COUNTY, Kan .— Forty-nine yeago AshleyshleYostst's grandfather sank a well deep into a half-mile square of rich Kansas farmland.
Her commercial rival and aesthetic antipode is Mariah Carey, another R. & B. singer who is selling remarkably well deep into her career.
When the Deepwater Horizon rig, drilling an exploratory well deep into rock through a mile of water and three miles into the ocean floor off the Louisiana coast, struck a highly pressurized pocket of oil and gas, causing an explosion, it was in some ways a consequence of this iterative, competitive game, each generation of discoveries pushing further into the unknown.
On "Guap," a rework of a song by the Australian outfit Mall Grab, Yaeji flips her skittish stance, singing dryly about wearing all black, driving German cars, and drinking Grey Goose, topics that play well deep into the morning at a lavish hotel-rooftop night club with a hot tub.
Neither starter recorded a decision, but both pitched well deep into the game.
Written and Directed by Mr. Boonstra, Butt X-ray is a documentary short that goes, well, deep into the story: .
Here, 40 miles west of the state capital, crews work through the night drilling new wells deep into the earth, and a small army of laborers rips through just-planted fields of winter wheat to install miles of gas pipeline.
Turns out pumping millions of gallons of salty wastewater from oil wells deep into the bowels of the Earth can give Oklahoma the shakes.
That positive result emboldened the project's leaders to push their wells deeper, into 200-degree Centigrade granite five kilometers deep – and last fall they finally turned on the taps.
In pressure pulse testing, a pressure signal generated by periods of injection and shut-in (from a pulsing well) propagates deep into the formation, and the corresponding response is recorded at the observation well(s).
If those guys aren't consistent and can't really pitch well enough deep into the game and something happens to Mariano [Rivera], to me that would be it.
