Texas doesn't actually have Forced Pooling like you find in other States, but the end results are the same pretty much the same.
Google "Unleased Co-Tenancy in Texas" and you'll find plenty to read on the subject (I just tried it and got 61K hits).
Eric Camp says that there is no penalty for being an unleased Co-Tenant, that once "Payout" (100%) has been reached you will begin receiving regular checks and invoices. There are a few circumstances where the State can impose additional penalties, but I don't think you're in that situation.
When a Working Interest Partner chooses to go "Non-Consent" (not putting up his share of the expenses of drilling or completing a well) the terms of the Operating Agreement dictate what penalties are assessed (they can be 300 or even 400%). But, as an unleased Co-Tenant, you are not subject to the Operating Agreement.
One thing you should be concerned about is if they can gerrymander your lands our of the unit because of your being unleased.
Don't you think it would be a whole lot simpler if you would just lease your interests?