The Texas Business Court continues to shape commercial litigation in Texas, including in disputes arising from the oil and gas industry. In Robert S. May, et al. v. INEOS USA Oil & Gas LLC, et al., Judge Stacy Rogers Sharp of the Fourth Division (San Antonio) issued a March 27, 2026, memorandum opinion addressing fundamental questions about farmout agreements, property interests, and the legal effect of retained-acreage provisions.

Background: The Farmout Dispute

The case involves a farmout agreement concerning oil and gas leases in the Eagle Ford Shale in McMullen County, Tex. In 2009, the plaintiffs (as farmors) and defendants (as farmees) executed a farmout agreement and corresponding partial assignments conveying the plaintiffs’ interests in two leases.

Under the contracts, plaintiffs assigned the leases to defendants while reserving several interests: a reversionary interest in “unearned” assets; an overriding royalty interest; a 25% interest in the initial test well; and a 30% reversionary “back-in” interest triggered upon “payout” — a defined moment when defendants recovered specified drilling and operating costs.

Plaintiffs contended that acreage not properly “earned” by drilling reverted to them during ongoing operations and that their reversionary and back‑in interests had already vested. Defendants, by contrast, argued that the leases were conveyed to them at the outset, subject only to limited future reversion, and that no partial termination or reversion could occur so long as continuous drilling operations continued and payout had not been reached.

Defendants moved for partial summary judgment, asking the court to resolve several threshold questions about how the contract should be interpreted.

The Court’s Key Holdings

Immediate Vesting of the Farmees’ Interest

The court held that defendants received a vested fee simple determinable interest in the leases immediately upon execution of the contracts. Distinguishing between an “agreement to transfer” (where a farmee’s rights vest only after performing conditions) and a “conditional assignment” (where the interest transfers immediately but is subject to later divestment), the court found the contracts constituted a conditional assignment.

The court held that operative language in the contracts — “does hereby GRANT, BARGAIN, SELL, CONVEY, ASSIGN, TRANSFER, SET OVER, and DELIVER” — demonstrated an upfront conveyance. Plaintiffs’ retained reversionary interest did not prevent defendants’ title from vesting at execution.

Cessation of Continuous Drilling Operations as the Sole Reversion Trigger

The court determined that lease reversions to plaintiffs could occur only “upon cessation of continuous drilling operations” and noted that no other event — including an alleged failure to properly designate earned wells or acreage — could trigger reversion under the contracts’ plain terms.

Earned-Acreage Provisions Operate as Special Limitations

The court addressed whether the agreement’s earned-acreage requirements qualified as covenants, conditions, or special limitations and ultimately held that they were special limitations.

While breach of a condition results in automatic termination of the leasehold estate, and breach of a covenant gives rise to damages instead of automatic termination, a special limitation “does not operate to cut short the estate but simply fixes one of the natural limits of the estate beyond which the estate cannot endure.” Citing Endeavor Energy Resources, L.P. v. Discovery Operating, Inc., the court explained that construing retained-acreage clauses as special limitations does not result in forfeiture but rather in “a partial termination of the leases under their own terms.”

Payout Calculation: “Earning Well by Earning Well”

Finally, the court clarified how payout should be calculated for purposes of triggering plaintiffs’ 30% reversionary back-in interest. Payout occurs at 7:00 a.m. on the first day following defendants’ recovery of specified costs relating to each earning well and its corresponding earned acreage — including costs from non-earning wells drilled on that acreage.

Importantly, the court rejected plaintiffs’ argument that payout could occur independently for non-earning wells. The court instead ruled that only an earning well can trigger payout; a well drilled on already earned acreage does not qualify as an earning well under the contracts.

Practical Takeaways

This decision offers several considerations for parties entering into or litigating farmout agreements:

• Drafting Matters: The distinction between an “agreement to transfer” and a “conditional assignment” may hinge on precise contract language. Parties should consider when and how interests vest when drafting agreements.
• Understand Retained-Acreage Mechanics: Retained-acreage provisions that operate as special limitations do not trigger forfeiture; they define the natural boundaries of the conveyed estate. This distinction might impact litigation strategy and remedies.
• Define Payout Clearly: Ambiguity in payout provisions may lead to expensive disputes. Parties should consider writing concrete definitions and explicit, consistent calculation methods into their agreements.
• Extrinsic Evidence Has Limits: The court sustained objections to post-execution evidence of the parties’ course of performance, reaffirming that Texas courts cannot consider such evidence to interpret unambiguous contracts.

Conclusion

May v. INEOS USA Oil & Gas demonstrates that the Texas Business Court will not hesitate to decide dispositive motions. For businesses and practitioners in the oil and gas industry, this opinion may serve as a helpful primer on farmout agreement interpretation.