About the contraction: I will have worked. vs I'll've worked?

[Payton Campbell]

Hi!
Is it correct to use 2 contractions with the auxiliars?

I will have worked = I'll've worked?
He would have been = He'd've been?

[Mister Micawber]

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Contractions are just ways of transcribing our pronunciation of the words, so you may write them in any way that communicates the pronunciation reasonably accurately. A few are standardized: don't, won't, I'll, he'd, etc.
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Native English teacher at Mister Micawber's