BBakken SubsurfaceNorth Dakota well index

NDIC file 18109 · API 33-061-01029-00-00

TOLLEFSON 44-10H

Operated by WHITING OIL AND GAS CORPORATION · Mountrail County, North Dakota

Active (A)Oil and gasSpud 2009

Well facts

Operator
WHITING OIL AND GAS CORPORATION
Status
Active (A)
Well type
Oil and gas (OG)
Field
SANISH
Spud date
Total depth
19,868 ft
Legal location
SESE Sec 10 T152N R91W
Footages
450 ft FSL · 275 ft FEL
County
Mountrail County
NDIC file no.
18109
API no.
33-061-01029-00-00

Location & navigation

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47.99352, -102.30147

Published surface location (NAD83). A horizontal well's lateral can run up to three miles from this point.

See it in 3D

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Production

204 months reported, Sep 2009 to Aug 2026, BAKKEN and CONFIDENTIAL pools.

Cumulative oil624KbblSep ’09 to Aug ’26 · 200 of 204 months known
Peak oil rate656bbl/dMar 2010 · 20,328 bbl in 31 days
Oil, last 12 months4,929bbl+26% against the 12 before
Gas–oil ratio, last 12 months1,775scf/bblfirst year 480 scf/bbl
Water cut, last 12 months21%first year 3% · 39.8K bbl water in all
Gas sold, last 12 months93%of gas produced · 36 mcf reported flared
0250500750Oil bbl/d2201020122014201620182020202220242026

Early time

First reported month
Sep 2009
Months to peak
7 (Mar 2010)
Peak month rate
656 bbl/d on 31 days
First 3 months, oil
—
First 6 months, oil
32,088 bbl (2 of 6 known)
First 12 months, oil
128,214 bbl (8 of 12 known)
First 24 months, oil
257,892 bbl (20 of 24 known)
Share of cumulative in year 1
21%

Today

Last reported month
Aug 2026
Last month with oil
Aug 2026
Latest oil rate
2 bbl/d
Latest rate as share of peak
0.3%
Uptime, last 12 months
100% of days
Cumulative gas
470K mcf
Cumulative water
39.8K bbl
Unknown months
4 of 204 (confidential or not in that month's report)
Pools reported
BAKKEN, CONFIDENTIAL
Last 12 months as a table
MonthOil bblGas mcfWater bblDaysOil bbl/dGOR scf/bblWater cut
3372,1116430116,26416%
4652,0193731154,3427%
1,0101,7756830341,7576%
5949977931191,67812%
468444240311594934%
474205302281743239%
3543703131111,0458%
388793130132047%
1142581293142,26353%
2553112163081,22046%
418884331132119%
52901053121,73167%

As first reported to NDIC in each month's report (NDIC Monthly Production Reports, Jan 2003 to Aug 2026). Operators amend past months later and the published reports are not updated, so a month can differ from the current record. A blank or missing month is unknown, not zero, and a cumulative over such months is a lower bound; two pools reported in one month are summed. Rates per producing day divide the month's volume by the days reported, so a month reported without producing days has no rate. Gas–oil ratio is gas produced over oil produced; water cut is water over oil plus water. Months from Jan 2003 to Apr 2015 are read from the Division's PDF reports, which print no flared gas and list a well in a unitized pool only inside its unit's total.

Spacing units

Units whose published footprint holds at least 660 ft of this well's surveyed lateral. Allowances are facts extracted from signed NDIC orders, machine-extracted and not human-reviewed.

Nearby wells

Closest published well heads within 3 miles; wells on one pad share a location.

Other published attributes (1)
symbolA-OG

DMR shapefile columns not shown above, unchanged.