BBakken SubsurfaceNorth Dakota well index

NDIC file 20109 · API 33-105-02078-00-00

MARILYN 21X-23

Operated by XTO ENERGY INC · Williams County, North Dakota

Active (A)Oil and gasSpud 2011

Well facts

Operator
XTO ENERGY INC
Status
Active (A)
Well type
Oil and gas (OG)
Field
CAPA
Spud date
Total depth
20,224 ft
Legal location
NENW Sec 23 T155N R95W
Footages
240 ft FNL · 1,560 ft FWL
County
Williams County
NDIC file no.
20109
API no.
33-105-02078-00-00

Location & navigation

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48.24010, -102.86508

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

179 months reported, Oct 2011 to Aug 2026, BAKKEN and CONFIDENTIAL pools.

Cumulative oil335KbblOct ’11 to Aug ’26 · 177 of 179 months known
Peak oil rate317bbl/dJul 2023 · 9,821 bbl in 31 days
Oil, last 12 months27.9Kbbl-35% against the 12 before
Gas–oil ratio, last 12 months2,248scf/bblfirst year 984 scf/bbl
Water cut, last 12 months48%first year 30% · 272K bbl water in all
Gas sold, last 12 months90%of gas produced · 2,045 mcf reported flared
0200400Oil bbl/d6320122014201620182020202220242026

Early time

First reported month
Oct 2011
Months to peak
142 (Jul 2023)
Peak month rate
317 bbl/d on 31 days
First 3 months, oil
7,335 bbl (1 of 3 known)
First 6 months, oil
22,472 bbl (4 of 6 known)
First 12 months, oil
41,655 bbl (10 of 12 known)
First 24 months, oil
78,922 bbl (22 of 24 known)
Share of cumulative in year 1
12%

Today

Last reported month
Aug 2026
Last month with oil
Aug 2026
Latest oil rate
63 bbl/d
Latest rate as share of peak
19.8%
Uptime, last 12 months
100% of days
Cumulative gas
552K mcf
Cumulative water
272K bbl
Unknown months
2 of 179 (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
2,7725,9672,41030922,15347%
2,6685,7322,39831862,14847%
2,4885,0272,18130832,02047%
2,6725,4372,40831862,03547%
2,5385,3302,42631822,10049%
2,1714,7822,07528782,20349%
2,3485,5552,19631762,36648%
2,1774,8861,97629752,24448%
2,1545,0792,00531692,35848%
2,0024,8131,80930672,40447%
1,9935,1361,80431642,57748%
1,9425,0181,83731632,58449%

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.