CHALKLEY "B"
Operated by OLSEN ENERGY INC. (P-5 621750) in the LEHN-APCO, S. (WICHITA-ALBANY) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.
The Railroad Commission's own record for the field this lease produces from, including the spacing rule that governs how close together its wells may be drilled.
These are facts about the field, not about this lease. The field holds 31 leases and 36 wells, and the rule below applies to all of them.
A drilling unit in this field needs at least 40 acres. The field rule took effect on 1992-12-14.
The register flags this field for hydrogen sulphide. That is a poisonous gas that occurs naturally in some formations. The flag is a property of the field as the Commission records it. It is not a measurement taken at this lease, and it is not a statement that gas is escaping anywhere.
The Commission's schedule remark for this field reads: “TO 4645'”
What this lease produced, and what it was worth
Oil and condensate are valued on the volume the state records as disposed of; gas and casinghead gas on the volume produced. They are different columns of different files, and the difference is not cosmetic.
| Stream | Basis | Volume | Value |
|---|---|---|---|
| Oil | Disposition | 8,722 bbl | $664,374 |
| Total | $664,374 | ||
Wells on this lease (1)
Every wellbore the Railroad Commission records against this lease key, with the depth, the last completion and the plug date exactly as filed. A well with no plug date is not stated to be producing — the state files no such flag.
These wells centre on 31.1046, -102.6797. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.0 miles.
What these wells add up to
Every figure below is counted over all of this lease's wells, not over the rows listed above. The Railroad Commission files two facts about a well's state — a plug date and a proration-schedule flag — and a well can carry both, so they are published as separate counts and never merged into a status.
What the state filed about each well
A plug date is the date the Commission recorded the wellbore as sealed with cement and abandoned. It is the only end-of-life fact Texas files. There is no "active" flag on a well, so this page does not print one — a well with no plug date is not stated to be producing.
How deep they were drilled
The one well that filed a depth was drilled to 4,838 ft.
1 well
| 42-37132469 | 1 | 4,838 ft | May 2001 | — | — |
The API number is the state's, prefixed 42 for Texas. A well is matched to this lease by the lease key the Commission files on the wellbore record, so a well that has moved between leases appears under each one it was filed against.
Every month this lease reported (48)
Volume × price = value, one row per cycle. The price columns are the same series published on the prices page — nothing here is modelled.
48 months
| May 2026 | 176 | 106.41 | 3.05 | $18,728 |
| Apr 2026 | 0 | 98.93 | 2.87 | $0 |
| Mar 2026 | 350 | 89.75 | 3.15 | $31,413 |
| Feb 2026 | 0 | 63.50 | 3.75 | $0 |
| Jan 2026 | 175 | 59.13 | 8.00 | $10,348 |
| Dec 2025 | 174 | 56.66 | 4.41 | $9,859 |
| Nov 2025 | 190 | 58.59 | 3.93 | $11,132 |
| Oct 2025 | 191 | 59.38 | 3.30 | $11,342 |
| Sep 2025 | 182 | 62.74 | 3.08 | $11,419 |
| Aug 2025 | 166 | 63.93 | 3.01 | $10,612 |
| Jul 2025 | 177 | 66.74 | 3.32 | $11,813 |
| Jun 2025 | 182 | 66.48 | 3.13 | $12,099 |
| May 2025 | 180 | 60.55 | 3.23 | $10,899 |
| Apr 2025 | 168 | 62.36 | 3.54 | $10,476 |
| Mar 2025 | 182 | 67.70 | 4.27 | $12,321 |
| Feb 2025 | 0 | 70.88 | 4.34 | $0 |
| Jan 2025 | 171 | 74.32 | 4.28 | $12,709 |
| Dec 2024 | 163 | 68.99 | 3.12 | $11,245 |
| Nov 2024 | 357 | 69.05 | 2.20 | $24,651 |
| Oct 2024 | 182 | 71.37 | 2.28 | $12,989 |
| Sep 2024 | 187 | 69.61 | 2.36 | $13,017 |
| Aug 2024 | 170 | 75.63 | 2.06 | $12,857 |
| Jul 2024 | 172 | 79.93 | 2.15 | $13,748 |
| Jun 2024 | 156 | 78.08 | 2.63 | $12,180 |
| May 2024 | 169 | 78.81 | 2.20 | $13,319 |
| Apr 2024 | 371 | 84.45 | 1.66 | $31,331 |
| Mar 2024 | 168 | 80.30 | 1.55 | $13,490 |
| Feb 2024 | 333 | 76.09 | 1.78 | $25,338 |
| Jan 2024 | 188 | 73.02 | 3.30 | $13,728 |
| Dec 2023 | 182 | 71.26 | 2.61 | $12,969 |
| Nov 2023 | 179 | 77.89 | 2.81 | $13,942 |
| Oct 2023 | 185 | 85.44 | 3.09 | $15,806 |
| Sep 2023 | 0 | 89.04 | 2.74 | $0 |
| Aug 2023 | 346 | 80.52 | 2.67 | $27,860 |
| Jul 2023 | 181 | 74.85 | 2.64 | $13,548 |
| Jun 2023 | 162 | 68.96 | 2.26 | $11,172 |
| May 2023 | 180 | 70.62 | 2.23 | $12,712 |
| Apr 2023 | 342 | 78.12 | 2.24 | $26,717 |
| Mar 2023 | 188 | 72.85 | 2.39 | $13,696 |
| Feb 2023 | 169 | 75.11 | 2.47 | $12,694 |
| Jan 2023 | 167 | 76.53 | 3.39 | $12,781 |
| Dec 2022 | 184 | 76.41 | 5.73 | $14,059 |
| Nov 2022 | 166 | 85.00 | 5.65 | $14,110 |
| Oct 2022 | 174 | 87.18 | 5.86 | $15,169 |
| Sep 2022 | 112 | 84.88 | 8.16 | $9,507 |
| Aug 2022 | 167 | 94.52 | 9.13 | $15,785 |
| Jul 2022 | 179 | 101.58 | 7.54 | $18,183 |
| Jun 2022 | 179 | 115.09 | 7.98 | $20,601 |
How to read this page
The arithmetic is one multiplication per stream per month. Here it is, worked, on a real row from the table above.
Oil 176 bbl × $106.41 = $18,728 ──────────────────────────────────────────────────── Month total $18,728
The volumes are the state's, unchanged
Every barrel and every Mcf on this page is a number the Railroad Commission of Texas published in its monthly production query. Nothing is modelled, estimated or filled in.
The dollars are a multiplication, not a valuation
Volume × a published monthly price. It is not what the operator was paid: it takes no account of a contract, a differential, a transportation deduction, or the share any one owner holds.
Oil and gas are priced differently
Oil is a Texas realisation — the crude oil first purchase price. Gas is a benchmark, because no free Texas wellhead gas series exists at any date. The prices page publishes the difference rather than correcting it away.
A lease is not a well
The state reports oil on lease and gas on well, and this page is the lease grain. 08/O/58181 is the state's own key, not one this site invented.