Eagle Ford – Page 18 – Peak Oil Barrel

Enno Peters’ post + EIA DPR Report

08/12/201408/13/2014 Ron Patterson 105 Comments

The first half of this post is a guest post by Enno Peters. The second half is taken from the latest EIA Drilling Productivity Report.

GEOGRAPHICAL ANALYSIS OF WELL QUALITY IN NORTH DAKOTA

by Enno Peters

SUMMARY

I was interested in doing a geographical analysis of the oil production in North Dakota. Detailed information made freely available by the NDIC allowed me to analyze how, geographically, wellperformance has been changing over time, in the area of North Dakota where most oil is produced.

RESULTS

In the following animated gif, you will see part of North Dakota. It contains the North West corner that borders Montana and Canada. The scale is in miles, with a rather arbitrary origin. Projected on this map is a contour map. The numbers of these contours are the cumulative 1 year returns for wells drilled within that area, and the unit is 1000 barrels of oil (no gas). For example, contours with the value 50 mark the area in which wells produced at least 50 k barrels of oil in their first year.

I could calculate the surface areas of several levels of first year well returns, in order to determine the trend of these areas. In the following chart you can see for each year the (estimated) surface volumes for 3 levels of first year well returns, 50k, 80k, and 110 k barrels of oil.

The sudden increase in 2013 of estimated productive surface area, in which wells could produce at least 50 k barrels of oil in their first year, may be explained by

1) the fact that I could only use data until June 2013 (as the 2014 May data is currently the latest one available), and therefore the number of data points are 1/3 of what I have for 2012. The method to determine the contours may not be suitable with this number of data points.

2) changing well practices

3) entering of new formations

So far I suspect that it is mostly 1), but that 2) and 3) could also be part of the answer, and therefore recommend to mostly ignore the 2013 results for now.

As a guide to interpret these results, I estimate (based on a discounted cash flow analysis) that a well that returns 50 k barrels of oil needs a minimum WTI price of about $120; about $82 WTI is needed for 80 k wells or better, and a well that returns 110 k barrels of oil in its first year is about even with $64 WTI. These are rough indications; I have seen a good analysis that estimates 10% higher required WTI prices for these levels of well performance. With current prices that would mean that 50 k wells are not profitable, while 80+ k wells clearly are.

I further estimate that the estimated total oil return (EUR) of a well is just over 4 times its first year return.
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EIA’s Drilling Productivity Report

07/14/201407/14/2014 Ron Patterson 63 Comments

Note: Just as I was finishing this post North Dakota published their production numbers for May 2014. North Dakota production was up over 36,000 barrels per day on 227 new well completions according to The Director’s Cut. I will have a post on all that tomorrow.

The EIA’s Drilling Productivity Report has just came out. Below are a few charts gleaned from that report. The World’s seven largest publicly owned oil companies have peaked. Their combined production has declined 12.4% since 2009.

The Drilling Productivity Report shows, or tries to show, the true decline rate of shale oil and gas. I usually only track the oil however.

In January the EIA estimated that Bakken production from new wells would equal 88 kb/d. They estimated that the declines of all older wells would equal 63 kb/d leaving net production at 25 kb/d.

In August they estimate that Bakken production from new wells will equal 90 kb/d or 2 kb/d above January new well production. They estimate that the decline from older wells will equal 73 kb/d, an increase of 10 kb/d from January, leaving a net increase in production of 17 kb/d.

Eagle Ford fared a bit different. In January they thought new well production would increase by 120 kb/d while older wells would decline by 91 kb/d leaving net production 29 kb/d. In August they expect production from new wells will equal 140 kb/d, a whopping 20 kb/d over January numbers. However decline from older wells will have increased to 115 kb/d, 24 kb/d more than it was in January, leaving net production up 25 kb/d. So in spite of the 20 kb/d increase over January new well production, net production will still be 2 kb/d lower than January.
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Oil Field Models, Decline Rates and Convolution

06/25/201411/14/2019 D Coyne 188 Comments

This post is by Dennis Coyne

The eventual peak and decline of light tight oil (LTO) output in the Bakken/ Three Forks play of North Dakota and Montana and the Eagle Ford play of Texas are topics of much conversation at the Peak Oil Barrel and elsewhere.

The decline rates of individual wells are very steep, especially early in the life of the well (as much as 75% in the first year for the average Eagle Ford well), though the decline rates become lower over time and eventually stabilize at around 6 to 7% per year in the Bakken.

What is not obvious is that for the entire field (or play), the decline rates are not as steep as the decline rate for individual wells. I will present a couple of simple model to illustrate this concept.

Much of the presentation is a review of ideas that I have learned from Rune Likvern and Paul Pukite (aka Webhubbletelescope), though any errors in the analysis are mine.

A key idea underlying the analysis is that of convolution. I will attempt an explanation of the concept which many people find difficult.

At Wikipedia there is a fairly mathematical presentation of the concepts which often confuses people. There are a couple of nice visuals to convey the concept as well see this page.

In the visual below a function f (in blue) is convolved with a function g (in red) to produce a third function (in black) which we could call h where h=f*g and the asterisk represents convolution, just as a + symbol is used to represent addition.

“Convolution of box signal with itself2” by Convolution_of_box_signal_with_itself.gif: Brian Amberg
derivative work: Tinos (talk) – Convolution_of_box_signal_with_itself.gif. Licensed under CC BY-SA 3.0 via Wikimedia Commons.

I think the best way to present convolution is with pictures. Chart A below shows a relationship between oil output (in barrels per month) and months from the first oil output for the average well in an unspecified LTO play.

This relationship is a simple hyperbola of the form q=a/(1+kt), where a and k are constants of 13,000 and 0.25 respectively, t is time in months, and q is oil output.

Chart A is often referred to as a well profile. The values for the constants were chosen to make the well profile fairly similar to an Eagle Ford average well profile. EUR30 is the estimated ultimate recovery from this average well over a 30 year well life.

blog140617/
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Texas RRC Report April Production Data

06/20/201406/20/2014 Ron Patterson 130 Comments

The Texas Rail Road Comission has released their latest report with oil, gas and condensate production for April. The RRC data is always incomplete however and takes many months for the all the data to trickle in. The below chart shows that problem.

The data is barrels per data with the EIA data through March and RRC data through April. The EIA has Texas C+C data is highly linear for the 10 months June 2013 through March 2014, increasing at 48 kb/d for 4 months, 41 kb/d for one month then 49 kb/d for the last 5 months.

The EIA has Texas C+C increasing at an average of 48.6 bp/d each month for the last two years. I think that is a little high. I think the production has been increasing at close to 43 kb/d each month but with a recent slow down in that increase.

All Texas RRC June report data is through April. The RRC does not combine Crude with Condensate so I have to add the two. But here you can see the problem. Each month the reported data increases with the latest months showing the largest increase. However even if this is the case, the latest month should show an increase almost equal to the final total increase for that month. That was the case in the April Report, (January to February), but not the case for the last two reports.
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The EIA’s Drilling Productivity Report and Other News

06/09/201406/09/2014 Ron Patterson 141 Comments

The EIA just released its latest Drilling Productivity Report which is a report on all major shale plays in the U.S. All the data below, unless otherwise noted, is in barrels per day.

The EIA includes the Permian production as shale or light tight oil production. No doubt some tight oil is produced in the Permian but I think most Permian oil is conventional oil.

Total shale oil production from all six shale plays. However I believe perhaps one million barrels of this is conventional production.
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