The phrase "considered invaluable" is correct and can be used in written English.
You can use it to describe something that is highly valuable and important, or to emphasize the value of something. For example: The book provided useful information about the culture, and was considered invaluable to the research.
Clerics with the highest level of scholarship are considered invaluable guides, especially in the secular West.
His diary is considered invaluable for its frank account of Napoleon's character and life in exile.
He was well respected there and considered invaluable, though he was given endless leaves and extended vacations.
Although there is no single text that is accepted as authoritative by all schools of Shintō thought, some books are considered invaluable as records of ancient beliefs and ritual; they are generally grouped together as shinten.
They're considered invaluable among some plastic and orthopedic surgeons, and are occasionally used to maintain circulation after the reattachment of fingers, hands and scalps.
Making concessions and accepting differences as complementary was considered invaluable, as in a marriage.
But after compiling that list, he can append a supplementary list of items he considers invaluable to the department, emphasizing his eagerness to work in a well-equipped setting with productive colleagues doing top-notch research.
But kindergarten teachers contend more classroom hours would allow them to better identify children with learning disabilities; do a more thorough job helping all students; and carve out more time for playing and listening to music, traditional activities they consider invaluable.
His Diary, kept all his life, is considered an invaluable source of information on the social, cultural, religious, and political life of 17th-century England.
Acting in Film (1987) is considered an invaluable resource for actors, and his memoirs What's It All About? (1993) and The Elephant to Hollywood (2010) affirm his reputation as a gifted raconteur.
Over the years, he worked with some of the most prestigious organizations in the greater New York area and was considered an invaluable resource to leading executives and board members.
