This is to be expected in these dark days of diminished cash flow. Imagine: You are the operator and the non-ops have given you their share of ad valorem taxes, expecting you to pay them to the taxing authority at the right time. Things are a little tight, if you know what I mean, so
Can the Tax Man Come After Your Stored Gas?
Co-author Matthew Wheatley
The owner of 33 BCF of gas cant’ just stuff it in his pocket and move it county-to-county to avoid taxes. So, the question: Is gas in storage subject to ad valorem tax on personal property? 
The Harris County Appraisal District thought so. The taxman prevailed in ETC Marketing v. Harris County