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Duvernay Reserves and Resources Report

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Alberta Energy Regulator<br />

Figure 19 shows that operators continued to vary the horizontal lengths of wells drilled between 2013 <strong>and</strong><br />

2015. In 2015, horizontal lengths of 2000 to 2200 metre were favoured.<br />

The information from these trends were combined to form a resource recovery evaluation scenario. It<br />

was assumed that the development trend in the area would continue with the most common spacing<br />

regime of 350 to 400 metres per well, which equates to a well density of roughly four wells per section.<br />

Using typical lateral wellbore lengths of 2000 to 2200 metres, <strong>and</strong> an eight-well pad configuration, the<br />

equivalent of approximately three sections will be developed per pad (the 8/3 rule) regardless of wellbore<br />

orientation as shown in Figure 20.<br />

As shown in Figure 20, the 8/3 rule assumes that each horizontal wellbore will intersect the equivalent of<br />

approximately 1.5 sections. If there will be four wells per developed section <strong>and</strong> each well intersects the<br />

equivalent of 1.5 sections, there must be eight wells per every three developed sections.<br />

To determine the total number of undeveloped locations to assign to each assessment area, the number of<br />

developed sections was determined by counting the total number of sections that were intersected by an<br />

existing <strong>Duvernay</strong> wellbore in each assessment area. The total number of sections were then subdivided<br />

between the oil <strong>and</strong> condensate fluid regions for each assessment area. Using the 8/3 rule, the total<br />

number of sections in each fluid region were converted to a total number of wells to be drilled. Existing<br />

<strong>Duvernay</strong> wells were then subtracted from the total well count in each fluid region to determine the total<br />

number of undeveloped locations. The total number of undeveloped well locations by assessment area is<br />

outlined in Figure 21.<br />

20<br />

Number of wells<br />

15<br />

10<br />

2013<br />

2014<br />

2015<br />

Well spacing<br />

began to increase.<br />

5<br />

0<br />

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