Is it easy for oil drilling engineers to immigrate to Canada?

No problem. Your situation belongs to 29 categories of occupations that can be immigrated:

8222 Head of Oil and Gas Drilling and Service

Because immigrants may have to wait 1-3 years, I suggest you walk on two legs.

Apply for immigration and work here at the same time, saving time and not delaying.

When looking for a job, don't just focus on Alberta and Calgary.

It hasn't fully recovered yet, so it's better to find an inter-provincial oil-related one.

Work. Once you have a job, it is natural to emigrate.