TUMBLEWEED, NE. (TANNEHILL), District 8A, Texas
A field is the Railroad Commission's unit of geology and of regulation. Its spacing rule is what decides how many wells an acreage can hold.
Our estimate: volumes the operator filed with the Commission, valued at the EIA first-purchase price for that month. It is not a payment anyone received, and it is not a royalty. It sums the 3 leases in this field that have a page here — 100% of the register's 3 — so it understates the field.
Production, 2025
The Railroad Commission's Oil and Gas Annual Report for 2025, its most recent. These are the state's figures for the whole field, not ours.
| Wells | In the field | Producing | Produced in 2025 | Also produced | Cumulative |
|---|---|---|---|---|---|
| Oil | 4 | 4 | 3,058 bbl | 0 mcfcasinghead | 214,399 bblsince discovery |
The discovery well's oil measured 37.0° API gravity, perforated at 3,942 ft.
Spacing rule
What the Commission requires of a well on this field.
| Wells | Rule | Effective | From the lease line | Between wells | Acres per unit | Max diagonal |
|---|---|---|---|---|---|---|
| Oil | B | 2006-02-28 | 467 ft | 933 ft | 40 | 0 ft |
Commission remarks: 3865-3890', SPACING AND DENSITY RULES.
County
Leases in this field
Every lease here files this field's number with the Commission and has a page on this site.
| Lease | Operator | Value |
|---|---|---|
| FOSTER | SCHALK OIL COMPANY, INC. | $10.6 M |
| WARREN UNIT | SCHALK OIL COMPANY, INC. | $2.5 M |
| FOSTER "230" | SAUDER MANAGEMENT COMPANY | $91 k |
Field number 91783700, from the Railroad Commission's field register. The register's own index resolves 3 leases and 6 wells to this field by name, over every lease in Texas rather than only those with a page here. It resolves a lease by NAME and refuses an ambiguous one, so it counts nothing for a field that shares its name with another — which is why the lease count above comes from the field number instead.