A Re-Entered Vertical Madison Well -- March 2, 2024

Locator: 46650B.

The well:

• 3550, 140, Empire North Dakota, Waddle-Olson 1, spud 5/64; cum 217K 12/23; drilled as a vertical Madison well sixty years ago, and re-entered as a horizontal well in October, 2022.
  

This vertical Madison well was re-entered in October, 2022. The build section began on October 28, 2022. The landing was achieved at 3520' MD / 1866' TVDSS. Very shallow compared to Bakken wells at depths of 8,000 to 9,000 feet. 

TD was reached on October 31, 2022, at 5,220' MD / 3326.7' TVD / 1871.7 TVDSS (true vertical depth below sea level). This is a conventional pool, not shale, and thus not fracked.

The original vertical well was drilled back in 1964 -- sixty years ago -- and this was the initial production: all oil, no gas, and very little water --

MADISON	6-1965	30	718	0	38	0	0	0
MADISON	5-1965	31	773	0	32	0	0	0
MADISON	4-1965	30	768	0	40	0	0	0
MADISON	3-1965	31	831	0	63	0	0	0
MADISON	2-1965	28	769	0	49	0	0	0
MADISON	1-1965	31	817	0	61	0	0	0
MADISON	12-1964	31	869	0	65	0	0	0
MADISON	11-1964	30	850	0	84	0	0	0
MADISON	10-1964	31	866	0	96	0	0	0
MADISON	9-1964	24	782	0	77	0	0	0
MADISON	8-1964	31	935	0	81	0	0	0
MADISON	7-1964	31	1064	0	93	0	0	0
MADISON	6-1964	17	905	0	79	0	0	0

Day in, day out, the well was active, for fifty years, not taken off line until 2013 for a bit longer than a year.

At that time, production:

MADISON	5-2014	31	413	393	17	0	0	0
MADISON	4-2014	30	374	400	16	0	0	0
MADISON	3-2014	13	168	0	0	0	0	0
MADISON	2-2014	0	0	0	0	0	0	0
MADISON	1-2014	0	0	0	0	0	0	0
MADISON	12-2013	0	0	0	0	0	0	0
MADISON	11-2013	0	0	0	0	0	0	0
MADISON	10-2013	31	0	0	0	0	0	0
MADISON	9-2013	30	0	0	0	0	0	0
MADISON	8-2013	0	0	0	0	0	0	0
MADISON	7-2013	0	0	208	0	0	0	0
MADISON	6-2013	0	0	0	0	0	0	0
MADISON	5-2013	0	0	0	0	0	0	0
MADISON	4-2013	21	236	213	9	0	0	0
MADISON	3-2013	31	337	431	13	0	0	0

Then, as noted, the well was re-entered and a lateral drilled for about 3,000 feet (landing about 2000' and ending with a TD of 5,220'MD). Production after the lateral was complete:

Pool	Date	Days	BBLS Oil	Runs	BBLS Water	MCF Prod	MCF Sold	Vent/Flare
MADISON	12-2023	31	2066	2360	232	0	0	0
MADISON	11-2023	30	2338	2400	289	0	0	0
MADISON	10-2023	31	2508	2508	269	0	0	0
MADISON	9-2023	30	2551	2573	319	0	0	0
MADISON	8-2023	31	2780	2768	128	0	0	0
MADISON	7-2023	31	2822	2797	259	0	0	0
MADISON	6-2023	30	2898	2797	419	0	0	0
MADISON	5-2023	29	2870	2853	563	0	0	0
MADISON	4-2023	30	3301	3299	34	0	0	0
MADISON	3-2023	24	3119	2905	32	0	0	0
MADISON	2-2023	0	0	0	0	0	0	0
MADISON	1-2023	29	2880	3105	3031	0	0	0
MADISON	12-2022	21	3435	3157	3615	0	0	0
MADISON	11-2022	10	1705	1964	1796	0	0	0
MADISON	10-2022	5	218	0	229	0	0	0
MADISON	9-2022	15	130	191	5	0	0	0
MADISON	8-2022	5	90	203	4	0	0	0
MADISON	7-2022	31	652	600	27	0	0	0

Knowing not much about this, but this seems to be quite a successful test. Conventional pools tend not to decline like Bakken shale wells, so this wells should produce at 2,500 bopm for quite some time. We'll see.

But there you have it. A re-entered vertical Madison wells with a short lateral.