It is difficult to ID the cause of your oak tree's wounds by looking at a picture. The wound on your tree does resemble that of a pressure pad created by oak wilt; however, these pads only occur on trees that were killed by the disease the following year. Oaks killed last year will display spore mats with pressure pads that
rupture the bark, usually evidenced by a slight swelling and a vertical crack. (Please see the photo on the first link below.)

If your tree died of the disease last year, there are other symptoms of the disease you would have observed last growing season, such as leaf browning and thinning of the canopy. (See the information in the second link below.

https://www.canr.msu.edu/news/persistence_of_oak_wilt

https://www.canr.msu.edu/news/oak_wilt_diagnosing_and_preventing

The link below will give you some additional information:

https://www.canr.msu.edu/news/understanding_oak_wilt

Your best resource for diagnosing and treating your tree is to consult a certified arborist. I highly recommend you do that.

An arborist is a certified and generally insured expert in trees and their problems. He or she can examine your tree and make recommendations regarding the health of the tree, any needed judicial pruning, and whether or not (in his opinion) it should be removed. You can find a certified arborist in your area here:

http://www.treesaregood.org/

Click on "Find an Arborist" at the top of the page; then click on United States from the pull-down menu. Then enter your State and City. This should bring up a list of certified arborists nearest to you. Or you may be able to locate one under "Tree Services" in your local Yellow Pages.