Is it possible to use the apple watch only with bluetooth and celular data (for example while in a remote area withouth wifi)?
Apple watch only with bluetooth
Apple Watch can still be used in conjunction with the paired iPhone (which it relies on for cellular services) in locations where there is no Wi-Fi network.
The availability of some built-in and third-party apps may vary, depending on your cellular data settings and cellular data network speeds.
If your question also relates to the longer-term, it is not presently possible to update the software on Apple Watch unless the paired iPhone is connected to a Wi-Fi network.
Some built-in features of Apple Watch can still be used even when the paired iPhone is not available via either Bluetooth or Wi-Fi.
About Bluetooth and Wi-Fi on Apple Watch
Use Apple Watch without its paired iPhone - Apple Support
Just as an example, when I am traveling abroad I usually do not enter the SIM pin in the iPhone, to prevent the iPhone from connecting to an expensive cellular network, when I do not want it to. So the iPhone and watch can only occasionally go online, if Wi-Fi is available, sometimes without a network for several days. But the watch is working well; it keeps the time, and the Activity app is recording its three goals in the rings.
Outdoor workouts that require the GPS will also work with only the Bluetooth connection.