COURT OF APPEALS

SECOND DISTRICT OF TEXAS

FORT WORTH

NO. 02-10-00455-CV

ROYALCO OIL & GAS 

CORPORATION

APPELLANT

V.

STOCKHOME TRADING 

CORPORATION

APPELLEE

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FROM THE 153RD DISTRICT COURT OF TARRANT COUNTY

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OPINION

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Appellant Royalco Oil & Gas Corporation appeals from the trial court‘s 

summary judgment in favor of Appellee Stockhome Trading Corporation. In one 

issue, Royalco argues that the trial court‘s failure to apply Texas oil and gas law

resulted in an erroneous determination that a partial transfer of a lessee‘s interest 

in a disposal well lease agreement was a sublease. Because we hold that the 
2

trial court did not err by declining to apply Texas law relating to mineral leases, 

we affirm.

Background

In February 2008, Stockhome entered into a ―Salt Water Disposal Lease 

Agreement‖ (the Lease) with Triad Rovan Services, L.P. (a third party not 

involved in this appeal). The Lease states that it ―shall in no way affect 

ownership of the oil, gas[,] or minerals in, on[,] or under the [lease premises]. 

This Lease is for the sole purpose of allowing [Triad] to conduct its Business 

Activities.‖ ―Business Activities‖ as defined in the Lease includes activities 

relating to the disposal and treatment of water produced from oil and gas wells. 

The Lease provides a term of ninety-nine years or until Triad discontinues its 

―Business Activities.‖ The Lease contains a provision that Triad ―shall not have 

the right to sell more than 50% to assign or sublet its interest in this Lease or the 

Premises‖ without Stockhome‘s written consent.

The Lease calls for Triad to make monthly rental payments. Failure to 

make rental payments is an event of default if Triad does not make the payment 

within fifteen days after receiving written notice of nonpayment. In the event of 

such default, Stockhome can terminate the Lease by sending Triad final written 

notice of its default and Stockhome‘s election to terminate. Triad then has ten 

days to cure.

On April 18, 2008, Triad entered into a ―Services Agreement‖ with Royalco. 

In the Services Agreement, Royalco agrees to provide services ―as specified on 
3

Exhibit A.‖ Exhibit A states that Triad ―has the right to manage a deep well‖ 

under the Lease with Stockhome, that Triad will continue to manage the well and 

the well site, and that Royalco will complete and operate the well, as well as 

another saltwater disposal well in Weatherford. The exhibit further states that 

―[i]n connection with [Royalco] providing the [s]ervices hereunder, [Triad] assigns 

to [Royalco] 50% of [Triad‘s] interest‖ in the Lease. After executing the Services 

Agreement, Royalco hired contractors to dig the existing well on the property 

another 800 feet.

Triad did not make its April 2008 rent payment to Stockhome when its 

check was returned for insufficient funds. Royalco issued a check to Stockhome 

to cover the April rent.

Triad failed to pay its May 2008 rent, and on June 25, 2008, Stockhome 

gave Triad written notice that it was terminating the Lease for nonpayment of the 

rent. Stockhome gave notice to Triad of its default but did not give notice to 

Royalco. In July 2008, Royalco offered to cure the default, but Stockhome 

declined to accept the offer.

Stockhome sued Triad based on the Lease agreement. Stockhome also 

sued Royalco for a declaratory judgment that, among other things, Royalco was 

a sublessee of Triad and had no standing under the Lease; that Stockhome

properly terminated the Lease; and that Royalco‘s sublease with Triad terminated 

immediately upon Stockhome‘s termination of the Lease. Royalco filed 
4

counterclaims for breach of contract, quantum meruit, promissory estoppel, 

declaratory relief, and unjust enrichment.

The trial court rendered a default judgment against Triad and subsequently 

granted summary judgment for Stockhome on its declaratory judgment action, 

decreeing that, among other things, the assignment from Triad to Royalco was a 

sublease and that Stockhome had properly terminated the Lease with Triad, 

which terminated Royalco‘s sublease. The trial court ordered that Royalco take 

nothing on its claims.

Analysis

Royalco brings one multi-part issue, which we construe as a Malooly

issue,1arguing that the trial court erred by granting summary judgment for 

Stockhome. Under this issue, Royalco makes two primary arguments: (1) 

Stockhome failed to support its motion with relevant, controlling Texas authority 

―i.e., Texas‘s well-developed oil and gas law‖ and (2) the trial court‘s construction 

of the assignment as a sublease is inconsistent with and contrary to Texas oil

and gas law.

Royalco‘s arguments on appeal primarily turn on whether the Services 

Agreement was an assignment or a sublease. That the Lease and the Services 

Agreement use the terms ―assign‖ and ―assignment‖ is not controlling. Parties 

 

1See Malooly Bros., Inc. v. Napier, 461 S.W.2d 119, 121 (Tex. 1970) 

(allowing an appellant in an appeal from the grant of summary judgment to bring 

one issue under which the appellant may brief all possible grounds upon which 

summary judgment should have been denied).
5

not infrequently use the term ―assignment‖ for instruments that, under the law, 

are subleases.2 We look to the substance of an instrument to determine its legal 

effect.3

Under the law relating to leases generally, the lessee‘s voluntary transfer 

of part or all of its interest under the lease to another is treated as either an 

assignment or a sublease, and the rights and liabilities of the parties depend on 

the nature of the transfer.4 If the lessee transfers his entire interest in part or all 

of the premises without retaining any reversionary interest, the transfer is an 

assignment.5 The assignee becomes the tenant in place of the original lessee 

and is in privity of estate with the lessor.6 If the lessee retains any reversionary 

interest, the transfer is a sublease, and the transferee is not in privity of estate or 

privity of contract.7 Royalco acknowledges in its brief that if the Services 

 

2See, e.g., Dameron Oil Co., Inc. v. Majeed, No. 10-01-00401-CV, 2004 

WL 1211620, at *2–3 (Tex. App.—Waco June 2, 2004, pet. denied) (mem. op.) 

(construing an instrument labeled as an ―Assignment of Lease‖ as a sublease 

and noting that ―[t]o decide whether there is an assignment or a sublease, the 

form of the instrument is not controlling‖); Parr v. Farmers State Bank of Orange 

Grove, 659 S.W.2d 883, 884 (Tex. App.—San Antonio 1983, no writ) (holding 

that the instrument in the case, though called an ―assignment,‖ was in reality a 

sublease).

3See Parr, 659 S.W.2d at 884.

4Amco Trust, Inc. v. Naylor, 159 Tex. 146, 150, 317 S.W.2d 47, 50 (1958).

5

Id.

6

Id.

7

Id.
6

Agreement constitutes a sublease rather than an assignment, no privity of 

contract or privity of estate exists between Royalco and Stockhome and that in 

that scenario, Royalco would have no contractual right to enforce the Lease 

against Stockhome.

Royalco first argues that under Texas law, oil and gas leases are different 

than ordinary leases and are subject to different rules and that as a matter of 

established oil and gas law, and under the Lease‘s express terms, Triad could 

and did assign up to fifty percent of its leasehold interest to Royalco. But the 

Lease between Stockhome and Triad was not a mineral lease. Nothing in the 

Lease, and no evidence in the record that Royalco has directed us to look at, 

gives any indication that the Lease was for the recovery of minerals from the 

property. The Lease by its plain terms was instead for the purpose of drilling and 

operating a disposal well on the premises.

Royalco points out that the Railroad Commission of Texas, which issues 

permits for oil and gas wells, issued a permit for this well. That a permit for the 

disposal well was issued by the Railroad Commission does not make this Lease 

an oil and gas lease. Rather, the Railroad Commission‘s issuance of a permit

merely reflects the legislature‘s adoption of a state policy relating to the 

maintenance of the quality of fresh water in the state and its delegation of

responsibility for oversight of injection wells to various state agencies.8 A 

 

8See Tex. Water Code Ann. §§ 27.003, 27.011 (West 2008). The Texas 

Water Code defines an injection well as ―an artificial excavation or opening in the 
7

disposal well is an injection well used specifically for the injection of industrial and 

municipal waste or oil and gas waste.9

The Railroad Commission is responsible for the control and disposition of 

waste and the prevention of pollution water resulting from activities associated 

with the production of oil, gas, or geothermal resources, including activities 

associated with the drilling of injection water source wells that penetrate the base 

of useable quality water.10 Accordingly, the drilling or operation of a disposal well 

requires a permit issued by the Railroad Commission.11 Thus, that the Railroad 

Commission issued a permit for the disposal well does not make the Lease a 

mineral lease subject to oil and gas law.

The Lease in this case was a salt water disposal agreement. The Lease

itself states that it ―shall in no way affect ownership of the oil, gas[,] or minerals 

in, on[,] or under the [lease premises].

12 This Lease is for the sole purpose of 

 

ground . . . used to inject, transmit, or dispose of industrial and municipal waste 

or oil and gas waste into a subsurface stratum‖ or a well that had originally been 

drilled to produce oil and gas but now ―is used to transmit, inject, or dispose of 

industrial and municipal waste or oil and gas waste into a subsurface stratum,‖ or 

―a well used for the injection of any other fluid.‖ Id. § 27.002(11) (West Supp.

2011).

9

Id. § 27.002(10).

10Id. § 26.131 (West 2008).

11Id. § 27.031 (West 2008).

12Cf. Irons v. Fort Worth Sand & Gravel Co., 260 S.W.2d 629, 630 (Tex. 

Civ. App.—Fort Worth 1953, writ ref‘d n.r.e.) (―A mineral lease is a sale of an 

interest in realty.‖).
8

allowing Lessee to conduct its Business Activities.‖ [Emphasis added.]

―Business Activities‖ as defined in the Lease includes activities relating to the 

disposal and treatment of water produced from oil and gas wells, but it does not 

include recovery of any minerals, or indeed the recovery of any natural 

resource.13 Because this Lease was not a lease for the production of minerals, 

the trial court correctly applied the law relating to leases generally, not the law 

governing oil and gas leases.14

Royalco next argues that Stockhome failed to prove as a matter of law that

the entire term of the leasehold interest was not assigned and that the 

assignment did not convey all of the interest or estate conveyed in the Lease. 

Royalco contends that its agreement with Triad ―contains no language that in any 

way limits the assignment of Triad‘s interest to Royalco for a period of time less

than the entire term of the Lease.‖ But the Services Agreement between 

Royalco and Triad included the following provision:

 

13See Killam Oil Co. v. Bruni, 806 S.W.2d 264, 267 (Tex. App.—San 

Antonio 1991, writ denied) (stating that ―under Texas law . . . the term 

 ̳production‘ as used in oil and gas leases means the actual physical extraction of 

the mineral from the soil‖); Parker v. Standard Oil Co. of Kan., 250 S.W.2d 671, 

680 (Tex. Civ. App.—Galveston 1952, writ ref‘d n.r.e.) (―The intention of the 

parties to a mineral lease is that minerals shall be produced from the land 

lease.‖); see also Minchen v. Fields, 162 Tex. 73, 79, 345 S.W.2d 282, 287 

(1961) (noting that ―[t]he sole purpose of a mineral lease is to develop the 

property in order to produce the minerals‖) (quoting Sheppard v. Stanolind Oil & 

Gas Co., 125 S.W.2d 643, 647 (Tex. Civ. App.—Austin 1939, writ ref‘d)).

14See Dick Props., LLC v. Paul H. Bowman Trust, 221 P.3d 618, 621 (Kan. 

Ct. App. 2010) (acknowledging a difference between an oil and gas lease and a 

saltwater disposal agreement).
9

1. Term

(a) The original term of this Agreement shall begin on the 

date hereof and shall expire on the 20 (18) year anniversary of the 

date hereof, unless sooner terminated in accordance with the terms 

of this Agreement.

The Services Agreement then provides for automatic termination if Royalco 

restructures. The agreement is unclear whether it expires in twenty years,

eighteen years, or in the year 2018. But although the Services Agreement

arguably raises a question of fact about the exact length of time that the parties 

intended the agreement to operate, it clearly was not intended to continue in 

effect for the nearly ninety-nine years remaining on the Lease.

And of course, the word ―term‖ as related to leases means more than just 

―time‖; to constitute an assignment, the transfer instrument ―must convey both the 

entire time for which the lease runs and the entire estate or interest conveyed by 

the original lease.‖

15 If the transferring party retains any reversionary interest in 

the transferred interest, the instrument is a sublease.16 Under the terms of the 

Services Agreement, Triad retained a fifty percent interest in the Lease, and it 

 

15718 Assocs., Ltd. v. Sunwest N.O.P., Inc., 1 S.W.3d 355, 360 (Tex. 

App.—Waco 1999, pet. denied) (emphasis added) (citing Davis v. Vidal, 105 Tex.

444, 447, 151 S.W. 290, 292 (1912)).

16Id.; see also Tawes v. Barnes, 340 S.W.3d 419, 429 (Tex. 2011) (noting 

that in an assignment, ―the original lessee retains no reversionary interest in the 

lease whatsoever‖); Amco Trust, 317 S.W.2d at 50 (―In order to constitute an 

assignment, the lessee must part with his entire interest in all or part of the 

demised premises without retaining any reversionary interest‖) (emphasis 

added).
10

had the right to terminate the Services Agreement upon Royalco‘s default and 

failure to cure.17 The Services Agreement did not assign the entire leasehold 

term, and, consequently, the agreement was a sublease.18

Royalco next argues that the Services Agreement was a valid partial 

assignment. Citing cases such as Ridge Oil Co. v. Guinn Investments,

19 Royalco 

asserts that Texas law unquestionably allows partial assignments ―of oil and gas 

leasehold estates like the one at issue in this case.‖ As we have stated, the

Lease is not a mineral lease, and the case law cited by Royalco is therefore 

inapplicable.

Royalco then argues that Stockhome failed to conclusively establish that it 

properly terminated Royalco‘s interest in the Lease. Royalco‘s argument under 

this section of its brief is based on its assertion that its agreement with Triad was 

an assignment, not a sublease. Accordingly, we overrule this portion of 

Royalco‘s argument.

Finally, Royalco makes two arguments relating to affirmative defenses it 

raised in response to Stockhome‘s summary judgment motion. Royalco first 

asserts that the trial court erred by granting summary judgment because a fact 

 

17See Jones v. El Paso Natural Gas Prods. Co., 391 S.W.2d 748, 752 

(Tex. Civ. App.—Austin 1965, writ ref‘d n.r.e.) (holding that inclusion in 

instruments of the right to terminate the tenancy on the breach of a covenant by 

the transferee made the instruments subleases and not assignments).

18See Amco Trust, 317 S.W.2d at 50.

19148 S.W.3d 143, 147 (Tex. 2004).
11

issue exists on the affirmative defense of estoppel by contract. In the two 

sentences of this part of its brief, Royalco argues that the Lease authorized Triad 

to partially assign up to fifty percent of its interest under the Lease and that 

―Stockhome‘s agreement to such assignment, at a minimum, creates a material 

facts issue as to whether [estoppel by contract] precludes Stockhome from 

denying Royalco‘s assigned interest.‖

Estoppel by contract is a doctrine ―whereby a party is bound by the terms 

of his own contract . . . until it is set aside by fraud, accident or mistake.‖

20

 But 

Royalco points to no evidence that it raised in the trial court that Stockhome did 

not abide by the terms of the Lease. The Lease states that Triad does not have 

the right to ―sell more than 50% to assign or sublet [i]ts interest in this Lease or 

the Premises‖ without Stockhome‘s consent. But this language does not convert 

the Services Agreement into an assignment,

21 and unless Triad made a valid 

assignment of its lease to Royalco, then Stockhome‘s termination of the Lease 

without notice to Royalco does not violate the terms of the Lease. As stated 

above, Stockhome and Royalco do not have privity of contract or of estate. 

Nothing in the record indicates that Stockhome was a party to a contract with

Royalco. The doctrine of estoppel by contract therefore has no application here. 

We overrule Royalco‘s argument.

 

20Mathews v. Sun Oil Co., 411 S.W.2d 561, 564 (Tex. Civ. App.—Amarillo 

1966), aff’d, 425 S.W.2d 330 (Tex. 1968).

21See Parr, 659 S.W.2d at 884.
12

Royalco‘s last argument is that the trial court erred by granting summary 

judgment because equitable estoppel applies. It argues that ―after being told 

about the Triad [a]ssignment, Stockhome accepted payments due under the 

Lease directly from Royalco and knowingly allowed Royalco to make valuable 

improvements to the [p]roperty.‖

Equitable estoppel is a doctrine by which a party, because of its voluntary 

conduct, is precluded from asserting rights it might otherwise have against 

another person who has relied on the party‘s conduct and ―has been led thereby 

to change his position for the worse.‖22 To establish equitable estoppel, a party 

must show (1) a false representation or concealment of material facts, (2) made 

with knowledge, actual or constructive, of those facts, (3) with the intention that it 

should be acted on, (4) to a party without knowledge, or the means of knowledge 

of those facts, (5) who detrimentally relied upon the misrepresentation.23

In its brief, Royalco fails to point out any false representation or 

concealment of material facts by Stockhome on which Royalco relied to its 

detriment. The Lease gave Triad the right to sell fifty percent of its interest to 

another party. In accordance with that provision, Triad executed the Services 

Agreement with Royalco. Royalco then made rental payments to Stockhome 

 

22Farmer v. Thompson, 289 S.W.2d 351, 356 (Tex. Civ. App.—Fort Worth 

1956, writ ref‘d n.r.e.).

23Argyle Indep. Sch. Dist. ex rel. Bd. of Trs. v. Wolf, 234 S.W.3d 229, 241 

(Tex. App.—Fort Worth 2007, no pet.).
13

and made improvements on the property, and Stockhome did not stop it from 

doing so. But none of these asserted facts show a misrepresentation or 

concealment of facts, much less any reliance by Royalco, and none of these 

facts show that Stockhome did not abide by the Lease terms.

To the extent that we can construe Royalco‘s brief to argue that 

Stockhome represented to Royalco that the provision in the Lease allowing for a 

fifty percent sale of interest by assignment or sublease allowed for a true 

assignment (as that term is used in landlord-tenant law) without Stockhome‘s 

consent, and assuming that this representation by Stockhome would support 

estoppel,24 Royalco points to no evidence that Stockhome did so. Royalco points 

to no evidence, for example, that Stockhome misrepresented to Royalco that the

Services Agreement agreement created privity of estate or contract between 

Royalco and Stockhome or that the Services Agreement gave Royalco the same 

rights under the Lease as Triad has, or even that Stockhome represented to 

Royalco that if Royalco improved the property, it would treat Royalco as a true 

assignee of the Lease rather than as a sublessee. Accordingly, we overrule this 

part of Royalco‘s argument, and, having overruled all of Royalco‘s arguments, we 

overrule its sole issue.

 

24See Fina Supply, Inc. v. Abilene Nat’l Bank, 726 S.W.2d 537, 540 (Tex. 

1987) (noting that generally, ―[a] representation as to the legal effect of a 

document is regarded as a statement of opinion rather than of fact‖).
14

Conclusion

Having overruled Royalco‘s sole issue, we affirm the trial court‘s 

judgment.25

LEE ANN DAUPHINOT

JUSTICE

PANEL: DAUPHINOT, WALKER, and MCCOY, JJ.

DELIVERED: January 26, 2012

 

25On January 23, 2012, this court received Stockhome‘s suggestion of 

bankruptcy and motion to reinstate. In that motion, Stockhome states that 

Royalco filed for bankruptcy on December 19, 2011, and that on January 19, 

2012, the bankruptcy court granted Stockhome relief from the automatic stay for 

purposes of this appeal. See 11 U.S.C. § 362(a) (2004 & Supp. 2011) (providing 

that when a defendant files for bankruptcy, all judicial proceedings against the 

defendant are automatically stayed). Stockhome asks this court to reinstate this 

appeal. Because this court never previously received notice of Royalco‘s 

bankruptcy filing, however, this appeal was never abated in accordance with the 

automatic stay. We therefore dismiss this motion as moot.