Oklahoma Supreme Court Bars Post-Production Deductions on Affiliate Wellhead Sales Under Gross Proceeds Act
Oklahoma Supreme Court ruled 6-3 that Devon Energy's deduction of gathering and compression costs from royalty payments across 14,000 STACK play wells violated the state's 2015 Gross Proceeds Act, exposing Devon to $890 million in underpayment claims. The decision turns on whether gas sold to Devon's midstream affiliate constitutes a sale at the wellhead under Oklahoma's statutory market value at the well framework, precluding post-production cost deductions under the netback calculation method.
Background
Devon Energy Corporation faces potential liability of $890 million in royalty underpayment claims spanning 14,000 wells in Oklahoma's STACK play following a 6-3 Oklahoma Supreme Court decision. The Mineral Owners Rights Coalition challenged Devon's practice of deducting gathering and compression costs from royalty payments, arguing these deductions violated Oklahoma's 2015 Gross Proceeds Act. The dispute centers on Devon's sales of natural gas to its midstream affiliate and whether such transactions trigger the Act's prohibition on post-production cost deductions when gas is sold at the wellhead.
The Legal Issue
The core question before the court was whether Devon's sales to its midstream affiliate constituted sales "at the wellhead" under Oklahoma's statutory definition, thereby prohibiting the use of netback calculation methods to deduct gathering and compression costs from gross proceeds. Devon argued that its affiliate transactions were downstream sales that occurred after the wellhead, permitting traditional post-production cost deductions. The royalty owners countered that the 2015 Gross Proceeds Act established a market value at the well standard that categorically bars such deductions when the initial sale occurs at or near the wellhead, regardless of the buyer's identity or relationship to the producer.
The Court's Analysis
The Oklahoma Supreme Court's majority held that gathering and compression costs cannot be deducted when gas is sold at the wellhead under the state's statutory framework. The court rejected Devon's characterization of its midstream affiliate sales as downstream transactions, finding that the physical location and timing of the sale—not the corporate relationship between buyer and seller—controls the application of the Gross Proceeds Act. The 6-3 decision represents a strict interpretation of the Act's wellhead sale provisions, limiting producers' ability to structure affiliate transactions in ways that preserve post-production cost deduction rights.
Implications for Operators
The decision creates substantial exposure for producers operating in Oklahoma who have structured midstream arrangements through affiliated entities while continuing to deduct gathering and compression costs from royalty payments. The $890 million potential liability across Devon's 14,000-well portfolio suggests per-well exposure averaging approximately $63,500, though actual damages will vary based on production volumes, cost structures, and lease-specific terms. Operators using similar affiliate transaction structures in Oklahoma must evaluate whether their royalty payment practices comply with the court's interpretation of the Gross Proceeds Act's market value at the well requirements.
The ruling may prompt producers to restructure midstream arrangements, potentially requiring arm's-length sales to unaffiliated gatherers or processors to preserve post-production cost deduction rights under Oklahoma law.