Pooling and units in Texas: what “on your unit” means

Published September 23, 2026.

Two mineral owners can live a quarter of a mile apart, watch the same well being drilled, and only one of them gets paid. The difference between them is pooling, and it is worth understanding properly, because almost every question that begins “there is a new well near me” ends up here.

Why wells are pooled

Wells are pooled for two practical reasons.

The first is regulation. The Texas Railroad Commission’s spacing rules set how far a well must be from lease lines and from other wells, and its density rules set how much acreage a well must have attributed to it. Statewide Rule 37 and Statewide Rule 38 provide the defaults, and most producing fields have their own field rules instead. An operator whose tract is too small to satisfy those rules cannot drill on it alone.

The second is geometry. A modern horizontal well runs a mile or two sideways through the target formation, and Texas surface ownership was laid out in the nineteenth century in tracts that pay no attention to where the rock is. A single lateral routinely crosses several separately owned tracts, and pooling is how the production from that one wellbore gets divided among them.

The result is a unit: a defined area made of one or more tracts, with a total acreage, whose owners share the unit’s production in proportion to the acreage each contributed.

How your tract joins a unit

Almost all Texas pooling is voluntary, which means it happens because somebody agreed to it in advance.

That agreement is the pooling clause in the oil and gas lease. A pooling clause gives the lessee the right to combine the leased acreage with other land into a unit, and it normally comes with limits: a maximum unit size, a requirement that the pooling be in good faith, and a requirement that the lessee file a written designation of the unit in the public records.

The designation of unit is the document that actually creates the unit. It is filed with the county clerk, in the deed records of the county where the land sits, and it lists the tracts, their acreages and the total. The operator separately files an acreage designation with the Railroad Commission for the well itself, which is how the Commission knows the well has enough acreage assigned to it.

Your share of the unit follows from the acreage.

your acres inside the unit / the unit's total acres   80 / 640   = 0.125
the royalty fraction in your lease                     1 / 5     = 0.20
the share of the minerals under that tract you own     1 / 2     = 0.50

decimal interest      0.125 x 0.20 x 0.50                        = 0.01250000

Two things follow from that arithmetic and surprise people. Pooling makes your share of any one well smaller and makes it far more likely that any well pays you at all, because you now share in every well drilled on the unit rather than waiting for one on your own acres. And the acreage credited to your tract is the part inside the unit, which may be less than the tract you own.

A lease with no pooling clause cannot be pooled without your agreement, and the document a lessee will ask for in that case is a ratification.

“On your unit” versus “near your land”

This is the distinction that decides whether a filing matters to you.

A well on a unit your tract is pooled into pays you, wherever in the unit the hole happens to be. The unit is the payment boundary, not the fence line, and a well on the far side of a 640-acre unit pays exactly as much as one on your own corner.

A well on a neighboring tract that is not in your unit pays that tract’s owners and not you. Distance has nothing to do with it. A permit three hundred feet from your property line and a permit three miles away are the same thing to your bank account if neither is on your unit.

There is a third case worth naming. Some Texas horizontal wells are drilled across separate leases without being pooled, under what the industry calls an allocation well or a production sharing agreement, with production allocated between the tracts by a formula such as lateral length. This practice is established in operation and has been contested in Texas courts and before the Commission, and whether a particular one is properly handling your interest is a question for an attorney rather than for a general guide.

Reading a unit designation

A designation of unit is a short document and it repays reading slowly.

The unit name. This is what will appear on your division order and every check stub afterwards, so it is the name to write down.
The tract list. Each tract, with the survey and abstract it sits in, the recording reference for the lease covering it, and the number of acres contributed.
The total unit acreage. The denominator of your fraction.
The effective date. From when the pooling is effective, which usually lines up with first production.
The plat. A drawing of the unit outline with the tracts inside it.

Find your tract in the tract list and check its acreage against your deed. That one comparison catches most of the errors an owner can catch, and the number is the denominator of everything that follows.

Unit designations are amended more often than people expect, usually to add or remove acreage, and an amendment changes decimals. If a decimal moves without explanation, an amended designation in the county records is the first place to look.

When you are not pooled

An unleased mineral owner whose minerals are produced by a unit they never joined is in a genuinely different position from a royalty owner. Texas law works that position out under rules about accounting between co-tenants, and it is not something to reason about from an article; it is one of the clearest cases in this whole subject for a Texas oil and gas attorney.

Texas also has a limited compulsory route, the Mineral Interest Pooling Act, under which a party can apply to the Railroad Commission to force pooling in certain circumstances. It is narrower than the forced-pooling regimes of other states, it has conditions about what must have been offered first, and applications under it are litigated proceedings.

A last case: a lease with no pooling clause, where the lessee wants your acreage in a unit. The instrument you will be sent is a ratification or a pooling amendment, and it is a real contract with real consequences either way. That is a document to read with an attorney and not a form to return with the rest of the mail.

What to do next

Find out, for each tract you own, whether it has been pooled and into what. The county clerk’s deed records are where the designation of unit lives, indexed under the lessee and often under the unit name. Then match the unit name against the lease names on your division orders and check stubs.

Take an unleased interest, a ratification, or a well that appears to be producing your minerals without paying you, to a Texas oil and gas attorney, and take the tax treatment of any new unit income to a CPA.

NetAcre finds your minerals on the county roll and tells you whether a new permit is on a unit you have claimed, free.