How to prevent whereRaw from automatically sort my collection?

I have a list of ids which are id after a collection is sorted, e.g:

$orderedIds = "2,18,4,1,17,5,6,16,15,14,13,11,12,10,9,8,7,3"

and I want to pick them out with whereRaw like this:

$result = Collection::whereRaw("FIELD(id, ".$orderedIds." )");

but the result is automatically sorted by id, which mean the collection output are literally the original collection:

[
 {
   "id": 1,
   ...
 }, {
   "id": 2,
   ...
 }, {
   "id": 3,
   ...
 }
]

Any option with whereRaw, or any other way around for me to achieve the sorted collection?

via Chebli Mohamed