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Permalink Reply by Skip Peel - Mineral Consultant yesterday

VSC, I'll let the experts answer this one however I'm asking about your typical well decline comment.  When you say typical well are you meaning typical current version Haynesville horizontal well?  As opposed to a U-Turn well?

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Permalink Reply by Cecil N Cannon yesterday

VSC,

Attached here are two Production Charts. "Red River L 18-19" shows 6 years of production. Well location is less than 2 miles away. "RKN G 16&9" shows roughly 1 year of production. Well location is less than 4 miles away.

*Not exact math but...

RKN G initially produces about 30,000 MCF/day, Then 12 months later produces about 8,000 MCF/day. 26% of initial production.

Red River L 18-19 initially produces about 14,000 MCF/day in 2019, in 2025 it is producing about 550 MCF/day. 3.9% of initial production. 

Both wells drilled into Haynesville Shale. Guessing the reason RKN G produced so much initially is because the surrounding rock was less developed, the Red River L is 1 of 10 wells in the two producing sections. 

Really interesting, thanks for bringing this up! Keep the good discussions going! 

Attachments:

• RKN G 16-19.png, 39 KB
• Red River 18-19.png, 38 KB

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Permalink Reply by VSC DeSoto South yesterday

Thank you both.

Im glad you asked, I am looking for either a well configured similarly to the one in question.  If that does not exist then any well, similar-ish?

The information on the 2 wells given is very helpful. It gives me an idea of what to expectin terms of a decline. I realize every well and location are different. 

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Permalink Reply by Ryan Howrish yesterday

I will take a look at this particular well and other wells in the area and provide a decline curve the individual well and an area "type curve" (average of wells in the area) and post them here.

Generally speaking, with modern completions, there are ~4 phases of production for wells:
1) Inclining to flat initial production as the well cleans up (significant volume of frac water produced)
2) Relatively flat to low decline rate as the wells flowing surface pressure is significantly above the gathering system/line pressure.
3) High decline rate as the well's flowing pressure declines and approaches the gathering system pressure.
4) Low decline rate hyperbolic "tail" as the well's surface flowing pressure is constant with the gathering system pressure. This is as close to a steady state system as the well's production will ever be.

All of these phases can be influenced by operational decisions and you will see different operators with different operating philosophies.

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Permalink Reply by Rock Man 9 hours ago

U Turn wells are becoming more and more common in many Hz drilling plays - not just in the Haynesville Shale.

The regular comment on their performance is that they are similar in initial rate and decline as that seen in normal "straight" Horizontal wells.

This comparison is normally based on comparing 10,000' straight laterals to Section sized U Turn laterals

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Permalink Reply by Ryan Howrish 10 hours ago

Below is a map showing all of the wells in Sections 30&31-11N-12W and a type curve for Mid-Bossier wells in this general area. Looking at the vertical depths of the three newest wells that cross these two sections and their proximity to the older Haynesville wells, I believe the new wells are all Mid-Bossier wells. Unfortunately, the three new wells do not have production data on the cross-unit lateral production report, so I was unable to generate individual well forecasts.

I filtered the wells to Mid-Bossier wells that came online within the last 5 years, within a 5-mile radius of these wells, and generated a type curve forecast. A type curve uses production data from producing wells to estimate the production from a similar well in the same area.

In this example, the average 10,000ft well has a peak rate of ~30,000 mcf/d and declines rapidly from there. In the type curve image, the light grey lines in the background are the gas rates from producing wells. The orange line represents the average production for each month. The dashed pink line is the best-fit forecast through the average. The forecast lines above and below the average line represent the P90 (low) and P10 (high). If the type curve uses representative wells, the actual production results from new wells should fall between the P90 and P10 most of the time. One thing to note is that the y-axis is on a logarithmic scale, which compresses data, so the rapid drop in production in the first few years does not visually appear as significant as it is.

On the map, the blue lines represent Mid-Bossier wells and the red line represent Haynesville wells.

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