I would go to a permit query.
https://webapps2.rrc.texas.gov/EWA/drillingPermitsQueryAction.do
Look up well by API, top right. Click on “Lease” link once the well pops up. Go to the bottom and look for attachments, select the one that says “Plat”. That should have a plat of the acreage.
It’s possible that your well is an allocation well and in that case the DO decimal will be based on the % of the total length in your tract times your decimal in that tract.
Alternatively just tell me the API and I’ll look it up. Somebody else might have a better answer, the RRC seems kinda suboptimal to me.