Possible Halo Effect Of A Horizontal Well On Very Old Vertical Wells -- July 13, 2016

Hang on buckaroos. This certainly looks interesting. There may be other explanations but I'll post it and see what folks think.

First, the production profile for this particular well which I will identify later on in the post. But first, some data.

• an old CLR well
• a vertical well (not a horizontal)
• proposed:pay thickness: 5'; zone of interest, 10,652 to 10,660 feet (8 feet)
• proposed:the pool targeted was the Sanish (Three Forks?); top of Three Forks at 10,648 ft; TD at 10,772 feet
• actual: the Three Forks was entered at 10,648 feet; the Sanish was encountered at 10,655 feet; drill stem test #1 was conducted exclusively over the Sanish sand from 10,642' to 10,660' (18 feet)
• actual: perforation record: 10,650' to 10,660'
• this well has never produced more than about 800 bbls/month since it was first drilled back in 1990
• exception: first full month: 2,363 bbls; and then quickly dropped to 700 bbls/month over the next few months; since then about 500 - 750 bbls/month for 15 years, day in, day out
• then note: it was taken off line 6/15? Why? A neighboring horizontal was being fracked -- see graphic down below
• note the spectacular jump in production for the next 8 months
• also note the amount of water produced after it was placed back on line; after the neighboring well was fracked
• again, this was an old, old vertical well -- probably met definition of a stripper well 
• more recently it was taken off line again because of neighboring wells that were being fracked 

Monthly Production Data of an old vertical well, partial spreadsheet, only recent data:

Pool	Date	Days	BBLS Oil	Runs	BBLS Water	MCF Prod	MCF Sold	Vent/Flare
SANISH	5-2016	22	11	0	7	75	0	75
SANISH	4-2016	2	3	128	0	0	0	0
SANISH	3-2016	15	706	696	65	699	0	699
SANISH	2-2016	29	3514	3579	485	3495	0	3495
SANISH	1-2016	31	3804	3869	678	3733	0	3733
SANISH	12-2015	31	3304	3074	901	3308	0	3308
SANISH	11-2015	30	3535	3832	1220	3575	0	3575
SANISH	10-2015	31	4242	4220	1547	4263	0	4263
SANISH	9-2015	30	6052	6280	1722	5991	0	5991
SANISH	8-2015	31	6340	6139	2202	6394	0	6394
SANISH	7-2015	23	4022	3688	2753	3935	0	3935
SANISH	6-2015	0	0	203	0	0	0	0
SANISH	5-2015	27	636	611	105	75	0	75
SANISH	4-2015	29	764	641	140	51	0	51
SANISH	3-2015	31	764	1067	105	0	0	0
SANISH	2-2015	28	690	651	105	0	0	0
SANISH	1-2015	31	796	916	122	0	0	0
SANISH	12-2014	20	553	449	103	0	0	0

Okay, so what well was it?

• 12979, 192, CLR, Gudbranson 1, Antelope, Sanish pool, vertical, t11/1990; cum 152K 5/16; 

Coming up: the screen shot of this area.  When you look at the screen shot, note: 

• first, note the "index" well, a vertical well, #12979, drilled back in 1990
• also, note three other vertical wells in the immediate area that are just as old (red arrows).
• now, note how closely the horizontal from #28332 passes by the old vertical well, #12979

So, when was #28332 fracked? I'll answer that after we look at the production profile.

The production profile of #28332, the horizontal well:

Pool	Date	Days	BBLS Oil	Runs	BBLS Water	MCF Prod	MCF Sold	Vent/Flare
SANISH	5-2016	31	22325	22173	4144	28701	28593	93
SANISH	4-2016	30	23647	23655	4199	31777	31672	90
SANISH	3-2016	31	26693	26656	4441	35180	35071	93
SANISH	2-2016	29	19669	19907	4034	23697	23596	87
SANISH	1-2016	31	20685	20444	4563	25673	24064	1593
SANISH	12-2015	31	18685	18685	4638	23461	22727	718
SANISH	11-2015	30	21789	22063	6473	26528	26312	201
SANISH	10-2015	31	17941	17375	6905	24184	23324	845
SANISH	9-2015	0	0	0	0	0	0	0
SANISH	8-2015	0	0	0	0	0	0	0
SANISH	7-2015	3	1360	1360	0	2585	0	2585
SANISH	6-2015	0	0	0	0	0	0	0

This well was fracked 6/6/2015, the very month that the Gudbranson vertical well was taken off-line and then the spectacular jump in production the very next month. 

• 28332, 1,373, CLR, Salers Federal 4-27H1, Antelope, Sanish pool, 30 stages, 6.1 million lbs sand/ceramic, fracked 6/15; t10/15; cum 173K 5/15; 

Let's look at the production profile for the other vertical wells in the immediate area, but just for a few months of note. All wells are Antelop, Sanish pool vertical wells:

#4168, production profile, drilled in 1966, still active:

SANISH	11-2015	22	161	486	0	0	0	0
SANISH	10-2015	28	218	0	0	0	0	0
SANISH	9-2015	12	171	466	0	0	0	0
SANISH	8-2015	17	258	0	0	0	0	0
SANISH	7-2015	13	218	0	0	0	0	0
SANISH	6-2015	7	308	444	0	0	0	0
SANISH	5-2015	0	0	0	0	0	0	0
SANISH	4-2015	0	0	0	0	0	0	0
SANISH	3-2015	2	150	0	0	0	0	0
SANISH	2-2015	0	0	0	0	0	0	0

#12198, production profile, drilled in 1988, still active:

SANISH	10-2015	31	2186	2149	215	2448	0	2200
SANISH	9-2015	30	2441	2389	194	2545	0	2305
SANISH	8-2015	31	2386	2417	356	2556	0	2308
SANISH	7-2015	25	921	1045	807	1330	0	1148
SANISH	6-2015	0	0	0	0	0	0	0
SANISH	5-2015	27	529	441	75	271	24	81
SANISH	4-2015	30	589	445	12	463	172	51

#12643, production profile, drilled in 1989, still active (blue bold is water):

SANISH	4-2016	30	1168	1339	38	1405	0	1165
SANISH	3-2016	31	2456	2345	146	2690	0	2442
SANISH	2-2016	29	2934	2837	257	3110	0	2879
SANISH	1-2016	31	2689	2892	317	2903	0	2655
SANISH	12-2015	31	2560	2381	222	2789	0	2541
SANISH	11-2015	30	2832	3040	360	3054	0	2814
SANISH	10-2015	31	3829	3733	253	4098	0	3866
SANISH	9-2015	30	5924	6313	369	5872	0	5632
SANISH	8-2015	31	6913	6557	772	6946	0	6698
SANISH	7-2015	29	3314	3122	1568	3481	0	3299
SANISH	6-2015	2	105	237	0	0	0	0
SANISH	5-2015	8	97	238	0	76	7	21
SANISH	4-2015	9	185	0	0	92	11	9
SANISH	3-2015	2	80	225	0	8	0	0
SANISH	2-2015	2	55	0	0	22	6	0
SANISH	1-2015	13	311	246	0	96	0	0
SANISH	12-2014	2	101	0	0	16	0	0
SANISH	11-2014	26	533	702	0	192	0	0

I only looked at the data of one horizontal well; there are many other horizontal wells in the immediate area that were also fracked at various times. 

Note: in a long note like this, there will be typographical and factual errors. I may be seeing things that do not exist. I may be "over-reading" things. I may be misinterpreting data. I may be cherry picking data. If this information is important to you, go to the source.

In the big scheme of things, this is not a big deal. The increased production only lasts a few months, maybe up to a year. But if one has mineral rights, one might be surprised at a jump in one's "mailbox money." In addition, it helps me understand, or at least think about, water flooding in the middle Bakken and Three Forks (sandstone, dolomite, NOT shale).  One can also get a feel for how far -- radially -- fracking is effective. I continue to opine that fracking "only goes out about 500 feet radially." This helps one understand how close the horizontals can be / should be placed.