Reef Development
Operator of record for 19 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Reef Development is the operator of record for 19 catalogued U.S. oil & gas wells in 1 state. 18 (95%) are active, 0 (0%) plugged & abandoned. Its largest concentration is in Illinois, with 19 wells (100% of its portfolio).
Wells operated
19
Active
18
Plugged
0
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 19 |
Well mix
- Oil wells
- 14
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 95%
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Claim Reef Development to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Reef Development operate?
Reef Development's catalogued wells are spread across 1 state: Illinois (19). Its 19 Illinois wells are 0.0% of the 174,478 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of Reef Development’s wells are active, plugged or orphaned?
95% of Reef Development's catalogued wells are active, 66 percentage points above the national share of 29%. 0% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Reef Development operate?
By product class, 14 (74%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Appel 4 in Madison, IL at 2,315 ft. The wells listed below sit in Madison (IL) and Christian (IL).
Notable wells operated by Reef Development
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Appel 4 | 12-119-00751 | Active | Oil | Madison, IL | Reef Development, Inc. | 2,315 ft |
| Mayer, Louis 2-SWD | 12-119-01476 | Active | Injection | Madison, IL | Reef Development, Inc. | 1,977 ft |
| Walters 1 | 12-021-25121 | Active | Oil | Christian, IL | Reef Development, Inc. | 1,929 ft |
| Walters 2 | 12-021-25122 | Active | Oil | Christian, IL | Reef Development, Inc. | 1,923 ft |
| Orlandini "A" 2 | 12-021-00919 | Active | Oil | Christian, IL | Reef Development, Inc. | 1,861 ft |
| Becker, H. C. R-1 | 12-119-28863 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,840 ft |
| Elbrings, D. A. 3R | 12-119-29310 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,820 ft |
| Becker, L. R-1 | 12-119-28862 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,820 ft |
| Dietz 6 | 12-119-29284 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,820 ft |
| Appel 6 | 12-119-28059 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,810 ft |
| Schmidt 2 | 12-119-29283 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,810 ft |
| Schrieber-Emma Beyer 9 | 12-119-28061 | Active | Oil | Madison, IL | Reef Development, Inc. | 1,810 ft |
Deepest first where depth is published. See all 19 wells →
Frequently asked questions
How many wells does Reef Development operate?
Reef Development is the operator of record for 19 catalogued oil & gas wells, with the largest concentration in Illinois (19). Only wells in states WellCensus has ingested are counted.
How many of Reef Development's wells are still active?
18 of Reef Development's catalogued wells are active; 0 are plugged & abandoned.
In which states does Reef Development operate wells?
Reef Development is the operator of record for wells in Illinois (19).
Does Reef Development operate mostly oil or gas wells?
14 of Reef Development's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Reef Development's deepest well?
Among wells with a published depth, Appel 4 in Madison, IL is the deepest at 2,315 ft.
Where Reef Development's wells are
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Reef Development — well portfolio”, https://wellcensus.com/operators/reef-development-66909 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).