Unit Petroleum Company v. David Pond Well Service, Inc., D/B/A D.W.P. Production, 439 S.W.3d 389

Background

The Tarboxes owned the S/2 of Section 539 (≈320 acres). A preexisting lease (Lease No. 05840) terminated after the Tarbox #1 well ceased producing.
July 19, 2005: Tarboxes executed an Oil, Gas & Mineral Lease to Armer & Quillan, later assigned to Unit Petroleum (the “Unit Lease”), covering the full S/2 but reserving to the Tarboxes the Tarbox #1 wellbore and production only from the Cleveland formation (7,930–7,990 ft).
July 25, 2005: Tarboxes executed a Wellbore Oil & Gas Lease to Pond limited to the existing Tarbox #1 borehole and Cleveland zone; Pond’s interest was recorded before Unit’s recording but Pond stipulated his estate was limited to the wellbore.
Pond became operator (P‑4 filed/approved) and produced the Tarbox #1. Unit later drilled wells on the S/2 (Laubhan wells), after which Pond complained that production affecte d Tarbox #1 and claimed an existing 80‑acre proration unit tied to the wellbore.
Unit sued for declaratory relief and to quiet title over the right to designate proration units. The trial court ruled Pond had an appurtenant contractual right to claim an 80‑acre proration unit and estopped Unit from disputing that right. This appeal followed.

Issues

Issue	Plaintiff's Argument (Unit)	Defendant's Argument (Pond)	Held
Whether the Wellbore Lease grants Pond an appurtenant contractual right to designate/assign a proration unit beyond the physical wellbore	Reservation is limited to the wellbore and does not reserve any executive right to designate acreage; Unit holds exclusive executive right over the 320 acres except the wellbore	The wellbore reservation and historical filings show parties intended the Tarbox #1 operator to control proration unit size/configuration (80‑acre unit)	Held for Unit in part: Pond has no contract right to designate acreage outside the wellbore; Unit has exclusive executive right to establish proration units over its leasehold but must allow production from the reserved wellbore by designating sufficient acreage for a Railroad Commission allowable
Whether Unit is estopped (quasi‑estoppel) from denying Pond the right to claim the 80‑acre proration unit	No estoppel: Pond’s purported contractual right was not in the lease language Unit accepted; Unit did not accept a benefit that requires conceding Pond’s claimed proration‑designation right	Yes estoppel: Unit accepted a lease containing the reservation and benefits tied to production rights, so it cannot later disavow Pond’s proration claim	Held for Unit: trial court’s estoppel ruling reversed — quasi‑estoppel inapplicable because the leases do not grant Pond the asserted right
Effect of Railroad Commission filings (P‑4/previous plat) on title/lease rights	Regulatory filings do not confer title or expand Pond’s leasehold rights; Unit’s executive right not limited by Pond’s P‑4	Pond relied on Commission records and operator change to succeed to the historic 80‑acre proration unit	Held for Unit: Commission permits/filings are not dispositive of title or lease rights here; Pond’s P‑4 did not convey greater rights than Tarboxes owned when Unit’s lease executed
Whether Unit’s executive right to set proration units is absolute versus subject to duty to permit production from reserved wellbore	Unit’s executive right is exclusive for the 320 acres; but it is subject to an implied duty to designate sufficient acreage to permit lawful production from the reserved wellbore	Pond contended operator entitlement to maintain 80‑acre unit and to have proration unit altered only at operator’s option	Held: Unit holds exclusive executive right to designate proration units across its leasehold, but it is burdened by an implied duty to designate sufficient acreage to obtain a Railroad Commission allowable that permits Pond to produce from the wellbore

Key Cases Cited

Sabre Oil & Gas Corp. v. Gibson, 72 S.W.3d 812 (Tex. App. — Eastland 2002) (oil and gas lease treated as a contract for interpretation)
Frost Nat’l Bank v. L & F Distribs., 165 S.W.3d 310 (Tex. 2005) (contract interpretation rules; give effect to parties' intent; unambiguous writing construed as a matter of law)
Nat’l Union Fire Ins. Co. v. CBI Indus., 907 S.W.2d 517 (Tex. 1995) (ambiguity determined as a matter of law; extrinsic evidence admissible only if ambiguous)
Friendswood Dev. Co. v. McDade & Co., 926 S.W.2d 280 (Tex. 1996) (same principles on contract ambiguity and admissible evidence)
Petro Pro, Ltd. v. Upland Res., 279 S.W.3d 743 (Tex. App. — Amarillo 2007) (interpretation of wellbore/formation‑limited assignments and scope of conveyed rights)
Natural Gas Pipeline Co. v. Pool, 124 S.W.3d 188 (Tex. 2003) (oil & gas lease grants fee‑simple determinable interest; lessee as grantee)
Lesley v. Veterans Land Bd., 352 S.W.3d 479 (Tex. 2011) (executive right follows mineral ownership unless expressly reserved)
SWEPI LP v. R.R. Comm’n of Tex., 314 S.W.3d 253 (Tex. App. — Austin 2010) (owner/lessee of mineral estate has implied rights to use surface as reasonably necessary to produce)
Tarrant Cnty. Water Control & Imp. Dist. No. One v. Haupt, 854 S.W.2d 909 (Tex. 1993) (right to enter and extract minerals inherent in mineral grants)
Day & Co. v. Texland Petroleum, 786 S.W.2d 667 (Tex. 1990) (attributes of severed mineral estates and executive rights)